[Proxool-cvs] proxool/src/java/org/logicalcobwebs/cglib/reflect ConstructorDelegate.java,NONE,1.1 FastClass.java,NONE,1.1 FastClassEmitter.java,NONE,1.1 FastConstructor.java,NONE,1.1 FastMember.java,NONE,1.1 FastMethod.java,NONE,1.1 MethodDelegate.java,NONE,1.1 MulticastDelegate.java,NONE,1.1

[<bil...@us...>]

Update of /cvsroot/proxool/proxool/src/java/org/logicalcobwebs/cglib/reflect
In directory sc8-pr-cvs1:/tmp/cvs-serv25673/src/java/org/logicalcobwebs/cglib/reflect

Added Files:
	ConstructorDelegate.java FastClass.java FastClassEmitter.java 
	FastConstructor.java FastMember.java FastMethod.java 
	MethodDelegate.java MulticastDelegate.java 
Log Message:
Repackaged Cglib project

--- NEW FILE: ConstructorDelegate.java ---
/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2002 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact ap...@ap....
 *
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */
package org.logicalcobwebs.cglib.reflect;

import java.lang.reflect.*;
import org.logicalcobwebs.cglib.core.*;
import org.logicalcobwebs.asm.ClassVisitor;
import org.logicalcobwebs.asm.Type;

/**
 * @author Chris Nokleberg
 * @version $Id: ConstructorDelegate.java,v 1.1 2003/12/12 19:28:13 billhorsman Exp $
 */
abstract public class ConstructorDelegate {
    private static final ConstructorKey KEY_FACTORY =
      (ConstructorKey)KeyFactory.create(ConstructorKey.class, KeyFactory.CLASS_BY_NAME);
    
    interface ConstructorKey {
        public Object newInstance(Class declaring, Class iface);
    }

    protected ConstructorDelegate() {
    }

    public static ConstructorDelegate create(Class targetClass, Class iface) {
        Generator gen = new Generator();
        gen.setTargetClass(targetClass);
        gen.setInterface(iface);
        return gen.create();
    }

    public static class Generator extends AbstractClassGenerator {
        private static final Source SOURCE = new Source(ConstructorDelegate.class.getName());
        private static final Type CONSTRUCTOR_DELEGATE =
          TypeUtils.parseType("org.logicalcobwebs.cglib.reflect.ConstructorDelegate");

        private Class iface;
        private Class targetClass;

        public Generator() {
            super(SOURCE);
        }

        public void setInterface(Class iface) {
            this.iface = iface;
        }

        public void setTargetClass(Class targetClass) {
            this.targetClass = targetClass;
        }

        public ConstructorDelegate create() {
            setNamePrefix(targetClass.getName());
            Object key = KEY_FACTORY.newInstance(iface, targetClass);
            return (ConstructorDelegate)super.create(key);
        }

        protected ClassLoader getDefaultClassLoader() {
            return targetClass.getClassLoader();
        }

        public void generateClass(ClassVisitor v) {
            setNamePrefix(targetClass.getName());

            final Method newInstance = ReflectUtils.findNewInstance(iface);
            if (!newInstance.getReturnType().isAssignableFrom(targetClass)) {
                throw new IllegalArgumentException("incompatible return type");
            }
            final Constructor constructor;
            try {
                constructor = targetClass.getDeclaredConstructor(newInstance.getParameterTypes());
            } catch (NoSuchMethodException e) {
                throw new IllegalArgumentException("interface does not match any known constructor");
            }

            ClassEmitter ce = new ClassEmitter(v);
            ce.begin_class(Constants.ACC_PUBLIC,
                           getClassName(),
                           CONSTRUCTOR_DELEGATE,
                           new Type[]{ Type.getType(iface) },
                           Constants.SOURCE_FILE);
            Type declaring = Type.getType(constructor.getDeclaringClass());
            EmitUtils.null_constructor(ce);
            CodeEmitter e = ce.begin_method(Constants.ACC_PUBLIC,
                                            ReflectUtils.getSignature(newInstance),
                                            ReflectUtils.getExceptionTypes(newInstance),
                                            null);
            e.new_instance(declaring);
            e.dup();
            e.load_args();
            e.invoke_constructor(declaring, ReflectUtils.getSignature(constructor));
            e.return_value();
            e.end_method();
            ce.end_class();
        }

        protected Object firstInstance(Class type) {
            return ReflectUtils.newInstance(type);
        }

        protected Object nextInstance(Object instance) {
            return instance;
        }
    }
}

--- NEW FILE: FastClass.java ---
/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2002 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact ap...@ap....
 *
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */
package org.logicalcobwebs.cglib.reflect;

import org.logicalcobwebs.cglib.core.*;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import org.logicalcobwebs.asm.ClassVisitor;
import org.logicalcobwebs.asm.Type;

abstract public class FastClass
{
    private Class type;

    protected FastClass(Class type) {
        this.type = type;
    }

    public static FastClass create(Class type) {
        Generator gen = new Generator();
        gen.setType(type);
        return gen.create();
    }

    public static class Generator extends AbstractClassGenerator
    {
        private static final Source SOURCE = new Source(FastClass.class.getName());
        private Class type;
        
        public Generator() {
            super(SOURCE);
        }

        public void setType(Class type) {
            this.type = type;
        }
        
        public FastClass create() {
            setNamePrefix(type.getName());
            return (FastClass)super.create(type.getName());
        }

        protected ClassLoader getDefaultClassLoader() {
            return type.getClassLoader();
        }

        public void generateClass(ClassVisitor v) throws Exception {
            new FastClassEmitter(v, getClassName(), type);
        }

        protected Object firstInstance(Class type) {
            return ReflectUtils.newInstance(type,
                                            new Class[]{ Class.class },
                                            new Object[]{ this.type });
        }

        protected Object nextInstance(Object instance) {
            return instance;
        }
    }
    
    public Object invoke(String name, Class[] parameterTypes, Object obj, Object[] args) throws InvocationTargetException {
        return invoke(getIndex(name, parameterTypes), obj, args);
    }

    public Object newInstance() throws InvocationTargetException {
        return newInstance(getIndex(Constants.EMPTY_CLASS_ARRAY), null);
    }

    public Object newInstance(Class[] parameterTypes, Object[] args) throws InvocationTargetException {
        return newInstance(getIndex(parameterTypes), args);
    }
    
    public FastMethod getMethod(Method method) {
        return new FastMethod(this, method);
    }

    public FastConstructor getConstructor(Constructor constructor) {
        return new FastConstructor(this, constructor);
    }

    public FastMethod getMethod(String name, Class[] parameterTypes) {
        try {
            return getMethod(type.getMethod(name, parameterTypes));
        } catch (NoSuchMethodException e) {
            throw new NoSuchMethodError(e.getMessage());
        }
    }

    public FastConstructor getConstructor(Class[] parameterTypes) {
        try {
            return getConstructor(type.getConstructor(parameterTypes));
        } catch (NoSuchMethodException e) {
            throw new NoSuchMethodError(e.getMessage());
        }
    }

    public String getName() {
        return type.getName();
    }

    public Class getJavaClass() {
        return type;
    }

    public String toString() {
        return type.toString();
    }

    public int hashCode() {
        return type.hashCode();
    }

    public boolean equals(Object o) {
        if (o == null || !(o instanceof FastClass)) {
            return false;
        }
        return type.equals(((FastClass)o).type);
    }

    /**
     * Return the index of the matching method. The index may be used
     * later to invoke the method with less overhead. If more than one
     * method matches (i.e. they differ by return type only), one is
     * chosen arbitrarily.
     * @see #invoke(int, Object, Object[])
     * @param name the method name
     * @param parameterTypes the parameter array
     * @return the index, or <code>-1</code> if none is found.
     */
    abstract public int getIndex(String name, Class[] parameterTypes);

    /**
     * Return the index of the matching constructor. The index may be used
     * later to create a new instance with less overhead.
     * @see #newInstance(int, Object[])
     * @param parameterTypes the parameter array
     * @return the constructor index, or <code>-1</code> if none is found.
     */
    abstract public int getIndex(Class[] parameterTypes);

    /**
     * Invoke the method with the specified index.
     * @see getIndex(name, Class[])
     * @param index the method index
     * @param obj the object the underlying method is invoked from
     * @param args the arguments used for the method call
     * @throws java.lang.reflect.InvocationTargetException if the underlying method throws an exception
     */
    abstract public Object invoke(int index, Object obj, Object[] args) throws InvocationTargetException;

    /**
     * Create a new instance using the specified constructor index and arguments.
     * @see getIndex(Class[])
     * @param index the constructor index
     * @param args the arguments passed to the constructor
     * @throws java.lang.reflect.InvocationTargetException if the constructor throws an exception
     */
    abstract public Object newInstance(int index, Object[] args) throws InvocationTargetException;

    abstract public int getIndex(Signature sig);

    /**
     * Returns the maximum method index for this class.
     */
    abstract public int getMaxIndex();

    protected static String getSignatureWithoutReturnType(String name, Class[] parameterTypes) {
        StringBuffer sb = new StringBuffer();
        sb.append(name);
        sb.append('(');
        for (int i = 0; i < parameterTypes.length; i++) {
            sb.append(Type.getDescriptor(parameterTypes[i]));
        }
        sb.append(')');
        return sb.toString();
    }
}

--- NEW FILE: FastClassEmitter.java ---
/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2002 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact ap...@ap....
 *
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */
package org.logicalcobwebs.cglib.reflect;

import java.lang.reflect.*;
import java.util.*;
import org.logicalcobwebs.cglib.core.*;
import org.logicalcobwebs.asm.ClassVisitor;
import org.logicalcobwebs.asm.Label;
import org.logicalcobwebs.asm.Type;
    
class FastClassEmitter extends ClassEmitter {
    private static final Signature CSTRUCT_CLASS =
      TypeUtils.parseConstructor("Class");
    private static final Signature METHOD_GET_INDEX =
      TypeUtils.parseSignature("int getIndex(String, Class[])");
    private static final Signature SIGNATURE_GET_INDEX =
      TypeUtils.parseSignature("int getIndex(org.logicalcobwebs.cglib.core.Signature)");
    private static final Signature TO_STRING =
      TypeUtils.parseSignature("String toString()");
    private static final Signature CONSTRUCTOR_GET_INDEX =
      TypeUtils.parseSignature("int getIndex(Class[])");
    private static final Signature INVOKE =
      TypeUtils.parseSignature("Object invoke(int, Object, Object[])");
    private static final Signature NEW_INSTANCE =
      TypeUtils.parseSignature("Object newInstance(int, Object[])");
    private static final Signature GET_MAX_INDEX =
      TypeUtils.parseSignature("int getMaxIndex()");
    private static final Signature GET_SIGNATURE_WITHOUT_RETURN_TYPE =
      TypeUtils.parseSignature("String getSignatureWithoutReturnType(String, Class[])");
    private static final Type FAST_CLASS =
      TypeUtils.parseType("org.logicalcobwebs.cglib.reflect.FastClass");
    private static final Type ILLEGAL_ARGUMENT_EXCEPTION =
      TypeUtils.parseType("IllegalArgumentException");
    private static final Type INVOCATION_TARGET_EXCEPTION =
      TypeUtils.parseType("java.lang.reflect.InvocationTargetException");
    private static final Type[] INVOCATION_TARGET_EXCEPTION_ARRAY = { INVOCATION_TARGET_EXCEPTION };
    
    public FastClassEmitter(ClassVisitor v, String className, Class type) {
        super(v);
        begin_class(Constants.ACC_PUBLIC, className, FAST_CLASS, null, Constants.SOURCE_FILE);

        // constructor
        CodeEmitter e = begin_method(Constants.ACC_PUBLIC, CSTRUCT_CLASS, null, null);
        e.load_this();
        e.load_args();
        e.super_invoke_constructor(CSTRUCT_CLASS);
        e.return_value();
        e.end_method();

        VisibilityPredicate vp = new VisibilityPredicate(type, false);
        List methodList = ReflectUtils.addAllMethods(type, new ArrayList());
        CollectionUtils.filter(methodList, vp);
        CollectionUtils.filter(methodList, new DuplicatesPredicate());
        final Method[] methods = (Method[])methodList.toArray(new Method[methodList.size()]);
        final Constructor[] constructors = (Constructor[])CollectionUtils.filter(type.getDeclaredConstructors(), vp);
        
        // getIndex(String)
        emitIndexBySignature(methods);

        // getIndex(String, Class[])
        emitIndexByClassArray(methods);
        
        // getIndex(Class[])
        e = begin_method(Constants.ACC_PUBLIC, CONSTRUCTOR_GET_INDEX, null, null);
        e.load_args();
        EmitUtils.constructor_switch(e, constructors, new GetIndexCallback(e, constructors));
        e.end_method();

        // invoke(int, Object, Object[])
        e = begin_method(Constants.ACC_PUBLIC, INVOKE, INVOCATION_TARGET_EXCEPTION_ARRAY, null);
        e.load_arg(1);
        e.checkcast(Type.getType(type));
        e.load_arg(0);
        invokeSwitchHelper(e, methods, 2);
        e.end_method();

        // newInstance(int, Object[])
        e = begin_method(Constants.ACC_PUBLIC, NEW_INSTANCE, INVOCATION_TARGET_EXCEPTION_ARRAY, null);
        e.new_instance(Type.getType(type));
        e.dup();
        e.load_arg(0);
        invokeSwitchHelper(e, constructors, 1);
        e.end_method();

        // getMaxIndex()
        e = begin_method(Constants.ACC_PUBLIC, GET_MAX_INDEX, null, null);
        e.push(methods.length - 1);
        e.return_value();
        e.end_method();

        end_class();
    }

    // TODO: support constructor indices ("<init>")
    private void emitIndexBySignature(Method[] methods) {
        CodeEmitter e = begin_method(Constants.ACC_PUBLIC, SIGNATURE_GET_INDEX, null, null);
        List signatures = CollectionUtils.transform(Arrays.asList(methods), new Transformer() {
            public Object transform(Object obj) {
                return ReflectUtils.getSignature((Method)obj).toString();
            }
        });
        e.load_arg(0);
        e.invoke_virtual(Constants.TYPE_OBJECT, TO_STRING);
        signatureSwitchHelper(e, signatures);
        e.end_method();
    }

    private static final int TOO_MANY_METHODS = 100; // TODO
    private void emitIndexByClassArray(Method[] methods) {
        CodeEmitter e = begin_method(Constants.ACC_PUBLIC, METHOD_GET_INDEX, null, null);
        if (methods.length > TOO_MANY_METHODS) {
            // hack for big classes
            List signatures = CollectionUtils.transform(Arrays.asList(methods), new Transformer() {
                public Object transform(Object obj) {
                    String s = ReflectUtils.getSignature((Method)obj).toString();
                    return s.substring(0, s.lastIndexOf(')') + 1);
                }
            });
            e.load_args();
            e.invoke_static(FAST_CLASS, GET_SIGNATURE_WITHOUT_RETURN_TYPE);
            signatureSwitchHelper(e, signatures);
        } else {
            e.load_args();
            EmitUtils.method_switch(e, methods, new GetIndexCallback(e, methods));
        }
        e.end_method();
    }

    private void signatureSwitchHelper(final CodeEmitter e, final List signatures) {
        ObjectSwitchCallback callback = new ObjectSwitchCallback() {
            public void processCase(Object key, Label end) {
                // TODO: remove linear indexOf
                e.push(signatures.indexOf(key));
                e.return_value();
            }
            public void processDefault() {
                e.push(-1);
                e.return_value();
            }
        };
        EmitUtils.string_switch(e,
                                (String[])signatures.toArray(new String[signatures.size()]),
                                Constants.SWITCH_STYLE_HASH,
                                callback);
    }

    private static void invokeSwitchHelper(final CodeEmitter e, final Object[] members, final int arg) {
        final Label illegalArg = e.make_label();
        Block block = e.begin_block();
        e.process_switch(getIntRange(members.length), new ProcessSwitchCallback() {
            public void processCase(int key, Label end) {
                Member member = (Member)members[key];
                Signature sig = ReflectUtils.getSignature(member);
                Type[] types = sig.getArgumentTypes();
                for (int i = 0; i < types.length; i++) {
                    e.load_arg(arg);
                    e.aaload(i);
                    e.unbox(types[i]);
                }
                if (member instanceof Method) {
                    e.invoke((Method)member);
                    e.box(Type.getType(((Method)member).getReturnType()));
                } else {
                    e.invoke_constructor(Type.getType(member.getDeclaringClass()), sig);
                }
                e.return_value();
            }

            public void processDefault() {
                e.goTo(illegalArg);
            }
        });
        block.end();
        EmitUtils.wrap_throwable(block, INVOCATION_TARGET_EXCEPTION);
        e.mark(illegalArg);
        e.throw_exception(ILLEGAL_ARGUMENT_EXCEPTION, "Cannot find matching method/constructor");
    }

    private static class GetIndexCallback implements ObjectSwitchCallback {
        private CodeEmitter e;
        private Map indexes = new HashMap();

        public GetIndexCallback(CodeEmitter e, Object[] members) {
            this.e = e;
            for (int i = 0; i < members.length; i++) {
                indexes.put(members[i], new Integer(i));
            }
        }
            
        public void processCase(Object key, Label end) {
            e.push(((Integer)indexes.get(key)).intValue());
            e.return_value();
        }
        
        public void processDefault() {
            e.push(-1);
            e.return_value();
        }
    }
    
    private static int[] getIntRange(int length) {
        int[] range = new int[length];
        for (int i = 0; i < length; i++) {
            range[i] = i;
        }
        return range;
    }
}

--- NEW FILE: FastConstructor.java ---
/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2002 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact ap...@ap....
 *
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */
package org.logicalcobwebs.cglib.reflect;

import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;

public class FastConstructor extends FastMember
{
    FastConstructor(FastClass fc, Constructor constructor) {
        super(fc, constructor, fc.getIndex(constructor.getParameterTypes()));
    }

    public Class[] getParameterTypes() {
        return ((Constructor)member).getParameterTypes();
    }

    public Class[] getExceptionTypes() {
        return ((Constructor)member).getExceptionTypes();
    }

    public Object newInstance() throws InvocationTargetException {
        return fc.newInstance(index, null);
    }

    public Object newInstance(Object[] args) throws InvocationTargetException {
        return fc.newInstance(index, args);
    }

    public Constructor getJavaConstructor() {
        return (Constructor)member;
    }
}

--- NEW FILE: FastMember.java ---
/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2002 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact ap...@ap....
 *
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */
package org.logicalcobwebs.cglib.reflect;

import java.lang.reflect.Member;

abstract public class FastMember
{
    protected FastClass fc;
    protected Member member;
    protected int index;

    protected FastMember(FastClass fc, Member member, int index) {
        this.fc = fc;
        this.member = member;
        this.index = index;
    }

    abstract public Class[] getParameterTypes();
    abstract public Class[] getExceptionTypes();

    public int getIndex() {
        return index;
    }

    public String getName() {
        return member.getName();
    }

    public Class getDeclaringClass() {
        return fc.getJavaClass();
    }

    public int getModifiers() {
        return member.getModifiers();
    }

    public String toString() {
        return member.toString();
    }

    public int hashCode() {
        return member.hashCode();
    }

    public boolean equals(Object o) {
        if (o == null || !(o instanceof FastMember)) {
            return false;
        }
        return member.equals(((FastMember)o).member);
    }
}

--- NEW FILE: FastMethod.java ---
/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2002 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact ap...@ap....
 *
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */
package org.logicalcobwebs.cglib.reflect;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class FastMethod extends FastMember
{
    FastMethod(FastClass fc, Method method) {
        super(fc, method, helper(fc, method));
    }

    private static int helper(FastClass fc, Method method) {
        try {
            return fc.getIndex(method.getName(), method.getParameterTypes());
        } catch (Error e) {
            System.err.println("Caught error " + e + " LOOKING UP INDEX name=" + method.getName() + " types=" + java.util.Arrays.asList(method.getParameterTypes()) + " in class " + fc.getClass().getName());
            throw e;
        }
    }

    public Class getReturnType() {
        return ((Method)member).getReturnType();
    }

    public Class[] getParameterTypes() {
        return ((Method)member).getParameterTypes();
    }

    public Class[] getExceptionTypes() {
        return ((Method)member).getExceptionTypes();
    }

    public Object invoke(Object obj, Object[] args) throws InvocationTargetException {
        return fc.invoke(index, obj, args);
    }

    public Method getJavaMethod() {
        return (Method)member;
    }
}

--- NEW FILE: MethodDelegate.java ---
/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2002 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact ap...@ap....
 *
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */
package org.logicalcobwebs.cglib.reflect;

import java.lang.reflect.*;
import org.logicalcobwebs.cglib.*;
import org.logicalcobwebs.cglib.core.*;
import org.logicalcobwebs.asm.ClassVisitor;
import org.logicalcobwebs.asm.Type;

// TODO: don't require exact match for return type

/**
 * <b>DOCUMENTATION FROM APACHE AVALON DELEGATE CLASS</b>
 *
 * <p>
 * Delegates are a typesafe pointer to another method.  Since Java does not
 * have language support for such a construct, this utility will construct
 * a proxy that forwards method calls to any method with the same signature.
 * This utility is inspired in part by the C# delegate mechanism.  We
 * implemented it in a Java-centric manner.
 * </p>
 *
 * <h2>Delegate</h2>
 * <p>
 *   Any interface with one method can become the interface for a delegate.
 *   Consider the example below:
 * </p>
 *
 * <pre>
 *   public interface MainDelegate {
 *       int main(String[] args);
 *   }
 * </pre>
 *
 * <p>
 *   The interface above is an example of an interface that can become a
 *   delegate.  It has only one method, and the interface is public.  In
 *   order to create a delegate for that method, all we have to do is
 *   call <code>MethodDelegate.create(this, "alternateMain", MainDelegate.class)</code>.
 *   The following program will show how to use it:
 * </p>
 *
 * <pre>
 *   public class Main {
 *       public static int main( String[] args ) {
 *           Main newMain = new Main();
 *           MainDelegate start = (MainDelegate)
 *               MethodDelegate.create(newMain, "alternateMain", MainDelegate.class);
 *           return start.main( args );
 *       }
 *
 *       public int alternateMain( String[] args ) {
 *           for (int i = 0; i < args.length; i++) {
 *               System.out.println( args[i] );
 *           }
 *           return args.length;
 *       }
 *   }
 * </pre>
 *
 * <p>
 *   By themselves, delegates don't do much.  Their true power lies in the fact that
 *   they can be treated like objects, and passed to other methods.  In fact that is
 *   one of the key building blocks of building Intelligent Agents which in tern are
 *   the foundation of artificial intelligence.  In the above program, we could have
 *   easily created the delegate to match the static <code>main</code> method by
 *   substituting the delegate creation call with this:
 *   <code>MethodDelegate.createStatic(getClass(), "main", MainDelegate.class)</code>.
 * </p>
 * <p>
 *   Another key use for Delegates is to register event listeners.  It is much easier
 *   to have all the code for your events separated out into methods instead of individual
 *   classes.  One of the ways Java gets around that is to create anonymous classes.
 *   They are particularly troublesome because many Debuggers do not know what to do
 *   with them.  Anonymous classes tend to duplicate alot of code as well.  We can
 *   use any interface with one declared method to forward events to any method that
 *   matches the signature (although the method name can be different).
 * </p>
 *
 * <h3>Equality</h3>
 *  The criteria that we use to test if two delegates are equal are:
 *   <ul>
 *     <li>
 *       They both refer to the same instance.  That is, the <code>instance</code>
 *       parameter passed to the newDelegate method was the same for both. The
 *       instances are compared with the identity equality operator, <code>==</code>.
 *     </li>
 *     <li>They refer to the same method as resolved by <code>Method.equals</code>.</li>
 *   </ul>
 *
 * @version $Id: MethodDelegate.java,v 1.1 2003/12/12 19:28:13 billhorsman Exp $
 */
abstract public class MethodDelegate {
    private static final MethodDelegateKey KEY_FACTORY =
      (MethodDelegateKey)KeyFactory.create(MethodDelegateKey.class, KeyFactory.CLASS_BY_NAME);

    protected Object target;
    protected String eqMethod;

    interface MethodDelegateKey {
        Object newInstance(Class delegateClass, String methodName, Class iface);
    }

    public static MethodDelegate createStatic(Class targetClass, String methodName, Class iface) {
        Generator gen = new Generator();
        gen.setTargetClass(targetClass);
        gen.setMethodName(methodName);
        gen.setInterface(iface);
        return gen.create();
    }

    public static MethodDelegate create(Object target, String methodName, Class iface) {
        Generator gen = new Generator();
        gen.setTarget(target);
        gen.setMethodName(methodName);
        gen.setInterface(iface);
        return gen.create();
    }

    public boolean equals(Object obj) {
        MethodDelegate other = (MethodDelegate)obj;
        return target == other.target && eqMethod.equals(other.eqMethod);
    }

    public int hashCode() {
        return target.hashCode() ^ eqMethod.hashCode();
    }

    public Object getTarget() {
        return target;
    }

    abstract public MethodDelegate newInstance(Object target);

    public static class Generator extends AbstractClassGenerator {
        private static final Source SOURCE = new Source(MethodDelegate.class.getName());
        private static final Signature NEW_INSTANCE =
          TypeUtils.parseSignature("org.logicalcobwebs.cglib.reflect.MethodDelegate newInstance(Object)");
        private static final Type METHOD_DELEGATE =
          TypeUtils.parseType("org.logicalcobwebs.cglib.reflect.MethodDelegate");
        
        private Object target;
        private Class targetClass;
        private String methodName;
        private Class iface;
        
        public Generator() {
            super(SOURCE);
        }

        public void setTarget(Object target) {
            this.target = target;
            this.targetClass = target.getClass();
        }

        public void setTargetClass(Class targetClass) {
            this.targetClass = targetClass;
        }

        public void setMethodName(String methodName) {
            this.methodName = methodName;
        }

        public void setInterface(Class iface) {
            this.iface = iface;
        }

        protected ClassLoader getDefaultClassLoader() {
            return targetClass.getClassLoader();
        }

        public MethodDelegate create() {
            setNamePrefix(targetClass.getName());
            Object key = KEY_FACTORY.newInstance(targetClass, methodName, iface);
            return (MethodDelegate)super.create(key);
        }

        protected Object firstInstance(Class type) {
            return ((MethodDelegate)ReflectUtils.newInstance(type)).newInstance(target);
        }

        protected Object nextInstance(Object instance) {
            return ((MethodDelegate)instance).newInstance(target);
        }

        public void generateClass(ClassVisitor v) throws NoSuchMethodException {
            Method proxy = ReflectUtils.findInterfaceMethod(iface);
            final Method method = targetClass.getMethod(methodName, proxy.getParameterTypes());
            if (!proxy.getReturnType().isAssignableFrom(method.getReturnType())) {
                throw new IllegalArgumentException("incompatible return types");
            }

            boolean isStatic = Modifier.isStatic(method.getModifiers());
            if ((target == null) ^ isStatic) {
                throw new IllegalArgumentException("Static method " + (isStatic ? "not " : "") + "expected");
            }

            ClassEmitter ce = new ClassEmitter(v);
            CodeEmitter e;
            ce.begin_class(Constants.ACC_PUBLIC,
                           getClassName(),
                           METHOD_DELEGATE,
                           new Type[]{ Type.getType(iface) },
                           Constants.SOURCE_FILE);
            ce.declare_field(Constants.PRIVATE_FINAL_STATIC, "eqMethod", Constants.TYPE_STRING, null, null);
            EmitUtils.null_constructor(ce);

            // generate proxied method
            Method proxied = iface.getDeclaredMethods()[0];
            e = ce.begin_method(Constants.ACC_PUBLIC,
                                ReflectUtils.getSignature(proxied),
                                ReflectUtils.getExceptionTypes(proxied),
                                null);
            e.load_this();
            e.super_getfield("target", Constants.TYPE_OBJECT);
            e.checkcast(Type.getType(method.getDeclaringClass()));
            e.load_args();
            e.invoke(method);
            e.return_value();
            e.end_method();

            // newInstance
            e = ce.begin_method(Constants.ACC_PUBLIC, NEW_INSTANCE, null, null);
            e.new_instance_this();
            e.dup();
            e.dup2();
            e.invoke_constructor_this();
            e.getfield("eqMethod");
            e.super_putfield("eqMethod", Constants.TYPE_STRING);
            e.load_arg(0);
            e.super_putfield("target", Constants.TYPE_OBJECT);
            e.return_value();
            e.end_method();

            // static initializer
            e = ce.begin_static();
            Signature sig = ReflectUtils.getSignature(method);
            e.push(sig.getName() + sig.getDescriptor());
            e.putfield("eqMethod");
            e.return_value();
            e.end_method();
            
            ce.end_class();
        }
    }
}

--- NEW FILE: MulticastDelegate.java ---
/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2002 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact ap...@ap....
 *
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */
package org.logicalcobwebs.cglib.reflect;

import java.lang.reflect.*;
import java.util.*;
import org.logicalcobwebs.cglib.core.*;
import org.logicalcobwebs.asm.ClassVisitor;
import org.logicalcobwebs.asm.CodeVisitor;
import org.logicalcobwebs.asm.Type;

abstract public class MulticastDelegate implements Cloneable {
    protected Object[] targets = {};

    protected MulticastDelegate() {
    }

    public List getTargets() {
        return new ArrayList(Arrays.asList(targets));
    }

    abstract public MulticastDelegate add(Object target);

    protected MulticastDelegate addHelper(Object target) {
        MulticastDelegate copy = newInstance();
        copy.targets = new Object[targets.length + 1];
        System.arraycopy(targets, 0, copy.targets, 0, targets.length);
        copy.targets[targets.length] = target;
        return copy;
    }

    public MulticastDelegate remove(Object target) {
        for (int i = targets.length - 1; i >= 0; i--) { 
            if (targets[i].equals(target)) {
                MulticastDelegate copy = newInstance();
                copy.targets = new Object[targets.length - 1];
                System.arraycopy(targets, 0, copy.targets, 0, i);
                System.arraycopy(targets, i + 1, copy.targets, i, targets.length - i - 1);
                return copy;
            }
        }
        return this;
    }

    abstract public MulticastDelegate newInstance();

    public static MulticastDelegate create(Class iface) {
        Generator gen = new Generator();
        gen.setInterface(iface);
        return gen.create();
    }

    public static class Generator extends AbstractClassGenerator {
        private static final Source SOURCE = new Source(MulticastDelegate.class.getName());
        private static final Signature NEW_INSTANCE =
          TypeUtils.parseSignature("org.logicalcobwebs.cglib.reflect.MulticastDelegate newInstance()");
        private static final Signature ADD_DELEGATE =
          TypeUtils.parseSignature("org.logicalcobwebs.cglib.reflect.MulticastDelegate add(Object)");
        private static final Signature ADD_HELPER =
          TypeUtils.parseSignature("org.logicalcobwebs.cglib.reflect.MulticastDelegate addHelper(Object)");
        private static final Type MULTICAST_DELEGATE =
          TypeUtils.parseType("org.logicalcobwebs.cglib.reflect.MulticastDelegate");

        private Class iface;

        public Generator() {
            super(SOURCE);
        }

        protected ClassLoader getDefaultClassLoader() {
            return iface.getClassLoader();
        }

        public void setInterface(Class iface) {
            this.iface = iface;
        }

        public MulticastDelegate create() {
            setNamePrefix(MulticastDelegate.class.getName());
            return (MulticastDelegate)super.create(iface.getName());
        }

        public void generateClass(ClassVisitor cv) {
            final Method method = ReflectUtils.findInterfaceMethod(iface);
            
            ClassEmitter ce = new ClassEmitter(cv);
            ce.begin_class(Constants.ACC_PUBLIC,
                           getClassName(),
                           MULTICAST_DELEGATE,
                           new Type[]{ Type.getType(iface) },
                           Constants.SOURCE_FILE);
            EmitUtils.null_constructor(ce);

            // generate proxied method
            emitProxy(ce, method);

            // newInstance
            CodeEmitter e = ce.begin_method(Constants.ACC_PUBLIC, NEW_INSTANCE, null, null);
            e.new_instance_this();
            e.dup();
            e.invoke_constructor_this();
            e.return_value();
            e.end_method();

            // add
            e = ce.begin_method(Constants.ACC_PUBLIC, ADD_DELEGATE, null, null);
            e.load_this();
            e.load_arg(0);
            e.checkcast(Type.getType(iface));
            e.invoke_virtual_this(ADD_HELPER);
            e.return_value();
            e.end_method();

            ce.end_class();
        }

        private void emitProxy(ClassEmitter ce, final Method method) {
            final CodeEmitter e = ce.begin_method(Constants.ACC_PUBLIC,
                                                  ReflectUtils.getSignature(method),
                                                  ReflectUtils.getExceptionTypes(method),
                                                  null);
            Type returnType = e.getReturnType();
            final boolean returns = returnType != Type.VOID_TYPE;
            Local result = null;
            if (returns) {
                result = e.make_local(returnType);
                e.zero_or_null(returnType);
                e.store_local(result);
            }
            e.load_this();
            e.super_getfield("targets", Constants.TYPE_OBJECT_ARRAY);
            final Local result2 = result;
            EmitUtils.process_array(e, Constants.TYPE_OBJECT_ARRAY, new ProcessArrayCallback() {
                public void processElement(Type type) {
                    e.checkcast(Type.getType(iface));
                    e.load_args();
                    e.invoke(method);
                    if (returns) {
                        e.store_local(result2);
                    }
                }
            });
            if (returns) {
                e.load_local(result);
            }
            e.return_value();
            e.end_method();
        }

        protected Object firstInstance(Class type) {
            // make a new instance in case first object is used with a long list of targets
            return ((MulticastDelegate)ReflectUtils.newInstance(type)).newInstance();
        }

        protected Object nextInstance(Object instance) {
            return ((MulticastDelegate)instance).newInstance();
        }
    }
}