package org.drools.examples.house;
/*
* $Id: HouseConsequenceFactory.java,v 1.3 2005/05/08 04:22:34 dbarnett Exp $
*
* Copyright 2005-2005 (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 registered trademark of The Werken Company.
*
* 5. Due credit should be given to The Werken Company.
* (http://drools.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
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*/
import org.drools.rule.Declaration;
import org.drools.rule.InvalidRuleException;
import org.drools.rule.Rule;
import org.drools.semantics.base.ClassObjectType;
import org.drools.smf.Configuration;
import org.drools.smf.ConsequenceFactory;
import org.drools.smf.FactoryException;
import org.drools.spi.Consequence;
import org.drools.spi.ConsequenceException;
import org.drools.spi.RuleBaseContext;
import org.drools.spi.Tuple;
public class HouseConsequenceFactory
implements
ConsequenceFactory
{
public Consequence newConsequence(Rule rule,
RuleBaseContext context,
Configuration config) throws FactoryException
{
Configuration childConfig = null;
Configuration[] configurations = config.getChildren( );
Consequence consequence = null;
for ( int i = 0; i < configurations.length; i++ )
{
childConfig = configurations[i];
if ( childConfig.getName( ).equals( "room" ) )
{
consequence = processRoom( rule,
childConfig );
}
}
return consequence;
}
private Consequence processRoom(Rule rule,
Configuration config) throws FactoryException
{
Configuration childConfig = null;
final String room = config.getAttribute( "name" );
Consequence consequence = null;
Configuration[] configurations = config.getChildren( );
for ( int i = 0; i < configurations.length; i++ )
{
childConfig = configurations[i];
if ( childConfig.getName( ).equals( "heating" ) )
{
final Declaration heatingDeclaration = getDeclaration( rule,
Heating.class,
"heating" );
if ( childConfig.getText( ).equals( "on" ) )
{
consequence = new Consequence( )
{
public void invoke(Tuple tuple) throws ConsequenceException
{
Heating heating = (Heating) tuple.get( heatingDeclaration );
heating.heatingOn( room );
}
};
}
else if ( childConfig.getText( ).equals( "off" ) )
{
consequence = new Consequence( )
{
public void invoke(Tuple tuple) throws ConsequenceException
{
Heating heating = (Heating) tuple.get( heatingDeclaration );
heating.heatingOff( room );
}
};
}
}
}
return consequence;
}
private Declaration getDeclaration(Rule rule,
Class clazz,
String identifier) throws FactoryException
{
Declaration declaration = rule.getParameterDeclaration( identifier );
if ( declaration == null )
{
ClassObjectType type = new ClassObjectType( clazz );
try
{
declaration = rule.addParameterDeclaration( identifier,
type );
}
catch ( InvalidRuleException e )
{
throw new FactoryException( "xxx" );
}
}
return declaration;
}
}