package org.drools.examples.helloworld;
/*
* $Id: HelloWorldExample.java,v 1.11 2006/01/13 07:26:55 michaelneale Exp $
*
* Copyright 2004 (C) The Werken Company. All Rights Reserved.
*
* Redistribution and use of this software and associated documentation
* ("Software"), with or without modification, are permitted provided that the
* following conditions are met:
*
* 1. Redistributions of source code must retain copyright statements and
* notices. Redistributions must also contain a copy of this document.
*
* 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 name "drools" must not be used to endorse or promote products derived
* from this Software without prior written permission of The Werken Company.
* For written permission, please contact bob@werken.com.
*
* 4. Products derived from this Software may not be called "drools" nor may
* "drools" appear in their names without prior written permission of The Werken
* Company. "drools" is a trademark of The Werken Company.
*
* 5. Due credit should be given to The Werken Company. (http://werken.com/)
*
* THIS SOFTWARE IS PROVIDED BY THE WERKEN COMPANY AND CONTRIBUTORS ``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 WERKEN COMPANY 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
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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*/
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Map;
import org.drools.DroolsException;
import org.drools.RuleBase;
import org.drools.WorkingMemory;
import org.drools.event.DebugWorkingMemoryEventListener;
import org.drools.io.ReteDumper;
import org.drools.io.RuleBaseLoader;
import org.drools.io.RuleSetLoader;
import org.drools.smf.RuleSetCompiler;
import org.drools.smf.RuleSetPackage;
import org.xml.sax.SAXException;
public class HelloWorldExample
{
public static void main( String[] args ) throws DroolsException,
SAXException,
IOException
{
if ( args.length != 1 )
{
args = new String[] { "helloworld.java.drl" };
System.out.println("You didn't tell me what DRL to run, so I am running " +
args[0] +
" \nI can also run the groovy and python equivalents if you tell me to !");
}
System.out.println( "Using drl: " + args[0] );
RuleSetLoader ruleSetLoader = new RuleSetLoader();
ruleSetLoader.addFromUrl( HelloWorldExample.class.getResource( args[ 0 ] ) );
//dumpGeneratedSourceToDisk( ruleSetLoader );
RuleBaseLoader ruleBaseLoader = new RuleBaseLoader();
ruleBaseLoader.addFromRuleSetLoader(ruleSetLoader);
RuleBase ruleBase = ruleBaseLoader.buildRuleBase();
//dumpReteNetwork( ruleBase );
System.out.println( "FIRE RULES(Hello)" );
System.out.println( "----------" );
WorkingMemory workingMemory = ruleBase.newWorkingMemory( );
workingMemory.addEventListener(
new DebugWorkingMemoryEventListener( ) );
workingMemory.assertObject( "Hello" );
workingMemory.fireAllRules( );
System.out.println( "\n" );
System.out.println( "FIRE RULES(GoodBye)" );
System.out.println( "----------" );
workingMemory = ruleBase.newWorkingMemory( );
workingMemory.addEventListener(
new DebugWorkingMemoryEventListener( ) );
workingMemory.assertObject( "Goodbye" );
workingMemory.fireAllRules( );
}
/** Just in case you want to dump out the contents to disk */
private static void dumpGeneratedSourceToDisk(RuleSetLoader ruleSetLoader) throws IOException,
FileNotFoundException {
Map map = ruleSetLoader.getRuleSets();
RuleSetCompiler compiler = (RuleSetCompiler) map.values().iterator().next();
byte[] jar = compiler.getSourceDeploymentJar();
//will put all the sources in the folling jar
File file = new File("/helloworld.jar");
if (file.exists()) file.delete();
FileOutputStream out = new FileOutputStream(file);
out.write(jar);
out.flush();
out.close();
}
/** Use ReteDumper to dump out the network if you need to */
private static void dumpReteNetwork(RuleBase ruleBase) {
System.out.println( "DUMP RETE" );
System.out.println( "---------" );
ReteDumper dumper = new ReteDumper( ruleBase );
dumper.dumpRete( System.out );
}
}