[Sunxacml-commit] sunxacml/com/sun/xacml/combine StandardCombiningAlgFactory.java,NONE,1.1

[<se...@us...>]

Update of /cvsroot/sunxacml/sunxacml/com/sun/xacml/combine
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv31308/com/sun/xacml/combine

Added Files:
	StandardCombiningAlgFactory.java 
Log Message:
introduced new, still unstable, factories for standard 1.0/1.1 behavior


--- NEW FILE: StandardCombiningAlgFactory.java ---

/*
 * @(#)StandardCombiningAlgFactory.java
 *
 * Copyright 2004 Sun Microsystems, Inc. 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. Redistribution of source code must retain the above copyright notice,
 *      this list of conditions and the following disclaimer.
 * 
 *   2. Redistribution 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.
 *
 * Neither the name of Sun Microsystems, Inc. or the names of contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 * 
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
 * ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
 * OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MICROSYSTEMS, INC. ("SUN")
 * AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE
 * AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
 * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST
 * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL,
 * INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY
 * OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
 * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 *
 * You acknowledge that this software is not designed or intended for use in
 * the design, construction, operation or maintenance of any nuclear facility.
 */

package com.sun.xacml.combine;

import com.sun.xacml.ProcessingException;
import com.sun.xacml.UnknownIdentifierException;

import java.net.URI;

import java.util.HashMap;


/**
 * This factory supports the standard set of datatypes specified in XACML
 * 1.0 and 1.1. It is the default factory used by the system.
 *
 * @author Seth Proctor
 */
public class StandardCombiningAlgFactory extends CombiningAlgFactory
{

    // the single factory instance
    private static StandardCombiningAlgFactory factoryInstance = null;

    // the map of available combining algorithms
    private HashMap algMap;

    // dummy object used as a lock for the getFactory routine
    // FIXME: this needs a better mechanism
    private static Object factoryLock = new Object();
    
    /**
     * Default constructor.
     */
    private StandardCombiningAlgFactory() {
        algMap = new HashMap();

        addAlgorithm(new DenyOverridesRuleAlg());
        addAlgorithm(new DenyOverridesPolicyAlg());

        addAlgorithm(new OrderedDenyOverridesRuleAlg());
        addAlgorithm(new OrderedDenyOverridesPolicyAlg());

        addAlgorithm(new PermitOverridesRuleAlg());
        addAlgorithm(new PermitOverridesPolicyAlg());

        addAlgorithm(new OrderedPermitOverridesRuleAlg());
        addAlgorithm(new OrderedPermitOverridesPolicyAlg());

        addAlgorithm(new FirstApplicableRuleAlg());
        addAlgorithm(new FirstApplicablePolicyAlg());

        addAlgorithm(new OnlyOneApplicablePolicyAlg());
    }

    /**
     * Returns the single instance of this factory, creating it if it doesn't
     * exist yet.
     *
     * @return the factory instance
     */
    public static CombiningAlgFactory getFactory() {
        if (factoryInstance == null) {
            synchronized (factoryLock) {
                if (factoryInstance == null)
                    factoryInstance = new StandardCombiningAlgFactory();
            }
        }

        return factoryInstance;
    }

    /**
     * Adds a combining algorithm to the factory. This single instance will
     * be returned to anyone who asks the factory for an algorithm with the
     * id given here.
     *
     * @param alg the combining algorithm to add
     *
     * @throws ProcessingException if the algId is already registered
     */
    public void addAlgorithm(CombiningAlgorithm alg)
        throws ProcessingException
    {
        String algId = alg.getIdentifier().toString();

        // check that the id doesn't already exist in the factory
        if (algMap.containsKey(algId))
            throw new ProcessingException("algorithm already registered");

        // add the algorithm
        algMap.put(algId, alg);
    }

    /**
     * Tries to return the correct combinging algorithm based on the
     * given algorithm ID.
     *
     * @param algId the identifier by which the algorithm is known
     *
     * @return a combining algorithm
     *
     * @throws UnknownIdentifierException algId is unknown
     */
    public CombiningAlgorithm createAlgorithm(URI algId)
        throws UnknownIdentifierException
    {
        String id = algId.toString();

        if (algMap.containsKey(id)) {
            return (CombiningAlgorithm)(algMap.get(algId.toString()));
        } else {
            throw new UnknownIdentifierException("unknown combining algId: "
                                                 + id);
        }
    }

}