jboss-svn-commits Mailing List for JBoss Community (Page 45)

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Author: mic...@jb...
Date: 2006-05-08 02:43:20 -0400 (Mon, 08 May 2006)
New Revision: 4127

Added:
   labs/jbossrules/trunk/drools-compiler/src/main/java/org/drools/compiler/RuleBaseLoader.java
   labs/jbossrules/trunk/drools-compiler/src/test/java/org/drools/compiler/RuleBaseLoaderTest.java
Modified:
   labs/jbossrules/trunk/drools-core/src/main/java/org/drools/RuleBaseFactory.java
Log:
Helper classes

Added: labs/jbossrules/trunk/drools-compiler/src/main/java/org/drools/compiler/RuleBaseLoader.java
===================================================================

--- labs/jbossrules/trunk/drools-compiler/src/main/java/org/drools/compiler/RuleBaseLoader.java	2006-05-08 06:37:03 UTC (rev 4126)
+++ labs/jbossrules/trunk/drools-compiler/src/main/java/org/drools/compiler/RuleBaseLoader.java	2006-05-08 06:43:20 UTC (rev 4127)
@@ -0,0 +1,73 @@
+package org.drools.compiler;
+
+import java.io.IOException;
+import java.io.Reader;
+
+import org.drools.CheckedDroolsException;
+import org.drools.RuleBase;
+import org.drools.RuleBaseFactory;
+import org.drools.rule.Package;
+
+/**
+ * A high level helper class for creating rulebases from source.
+ * For additional control, refer to the DrlParser and PackageBuilder classes.
+ * You can have much more detailed control with the lower level classes.
+ * 
+ * @author Michael Neale
+ */
+public class RuleBaseLoader {
+
+    private static RuleBaseLoader INSTANCE = new RuleBaseLoader();
+    private static int engineType = RuleBase.RETEOO;
+    
+    private RuleBaseLoader() {
+    }
+    
+    /** Get an instance of the loader */
+    public static RuleBaseLoader getInstance() {
+        return INSTANCE;
+    }
+    
+    /**
+     * Create a new RuleBase from the drl source. 
+     * Uses the current default engine type.
+     */
+    public RuleBase loadFromReader(Reader drl) throws CheckedDroolsException, IOException  {
+        PackageBuilder builder = new PackageBuilder(  );
+        builder.addPackageFromDrl( drl );
+        return makeRuleBase( builder );
+    }
+    
+    /**
+     * Create a new RuleBase from the drl and dsl source.
+     * Uses the current default engine type.
+     */
+    public RuleBase loadFromReader(Reader drl, Reader dsl) throws CheckedDroolsException, IOException  {
+        PackageBuilder builder = new PackageBuilder(  );
+        builder.addPackageFromDrl( drl, dsl );
+        return makeRuleBase( builder );
+    }    
+
+    /** Replace the default engine type that will be used (default is RETEOO) */
+    public void setDefaultEngineType(int type) {
+        engineType = type;
+    }
+    
+    private RuleBase makeRuleBase(PackageBuilder builder) throws CheckedDroolsException {
+        if (builder.hasErrors()) {
+            throw new CheckedDroolsException("There were errors in the rule source: " + builder.printErrors());
+        }
+        Package binaryPackage = builder.getPackage();
+        
+        RuleBase rb = RuleBaseFactory.newRuleBase(engineType);
+        try {
+            rb.addPackage( binaryPackage );
+        } catch ( Exception e ) {
+            throw new CheckedDroolsException("Unable to add compiled package to rulebase. Nested error is: " + e.getMessage());
+        }
+        return rb;
+    }
+    
+
+    
+}


Property changes on: labs/jbossrules/trunk/drools-compiler/src/main/java/org/drools/compiler/RuleBaseLoader.java
___________________________________________________________________
Name: svn:eol-style
   + native

Added: labs/jbossrules/trunk/drools-compiler/src/test/java/org/drools/compiler/RuleBaseLoaderTest.java
===================================================================
--- labs/jbossrules/trunk/drools-compiler/src/test/java/org/drools/compiler/RuleBaseLoaderTest.java	2006-05-08 06:37:03 UTC (rev 4126)
+++ labs/jbossrules/trunk/drools-compiler/src/test/java/org/drools/compiler/RuleBaseLoaderTest.java	2006-05-08 06:43:20 UTC (rev 4127)
@@ -0,0 +1,39 @@
+package org.drools.compiler;
+
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.Reader;
+
+import org.drools.RuleBase;
+import org.drools.integrationtests.IntegrationCases;
+import org.drools.leaps.RuleBaseImpl;
+
+import junit.framework.TestCase;
+
+public class RuleBaseLoaderTest extends TestCase {
+
+    public void testLoadRuleBase() throws Exception {
+        InputStream in = IntegrationCases.class.getResourceAsStream( "HelloWorld.drl" );
+        RuleBase rb = RuleBaseLoader.getInstance().loadFromReader(new InputStreamReader(in));
+        assertNotNull(rb);
+    }
+    
+    public void testLoadRuleBaseWithDSL() throws Exception {
+        InputStream in = IntegrationCases.class.getResourceAsStream( "rule_with_expander_dsl.drl" );
+        InputStream inDSL = IntegrationCases.class.getResourceAsStream( "test_expander.dsl" );
+        RuleBase rb = RuleBaseLoader.getInstance().loadFromReader(new InputStreamReader(in), new InputStreamReader(inDSL));
+        assertNotNull(rb);
+    }    
+    
+    public void testEngineType() throws Exception {
+        InputStream in = IntegrationCases.class.getResourceAsStream( "HelloWorld.drl" );
+        RuleBaseLoader loader = RuleBaseLoader.getInstance();
+        loader.setDefaultEngineType( RuleBase.LEAPS );
+        RuleBase rb = loader.loadFromReader(new InputStreamReader(in));
+        assertNotNull(rb);
+        assertTrue(rb instanceof RuleBaseImpl);
+        
+    }
+    
+    
+}


Property changes on: labs/jbossrules/trunk/drools-compiler/src/test/java/org/drools/compiler/RuleBaseLoaderTest.java
___________________________________________________________________
Name: svn:eol-style
   + native

Modified: labs/jbossrules/trunk/drools-core/src/main/java/org/drools/RuleBaseFactory.java
===================================================================
--- labs/jbossrules/trunk/drools-core/src/main/java/org/drools/RuleBaseFactory.java	2006-05-08 06:37:03 UTC (rev 4126)
+++ labs/jbossrules/trunk/drools-core/src/main/java/org/drools/RuleBaseFactory.java	2006-05-08 06:43:20 UTC (rev 4127)
@@ -38,7 +38,7 @@
     }
 
     /** Create a new RuleBase of the appropriate type */
-    public RuleBase newRuleBase(int type) {
+    public static RuleBase newRuleBase(int type) {
         switch ( type ) {
             case RuleBase.RETEOO :
                 return new org.drools.reteoo.RuleBaseImpl();





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