package org.drools.semantics.java;
/*
* $Id: JavaBlockConsequence.java,v 1.9 2005/11/10 05:10:08 mproctor Exp $
*
* Copyright 2002 (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
* 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.
*
*/
import java.io.Serializable;
import java.util.List;
import org.drools.rule.Declaration;
import org.drools.rule.Rule;
import org.drools.smf.ConsequenceInvoker;
import org.drools.smf.Invoker;
import org.drools.smf.SemanticConsequence;
import org.drools.smf.SemanticRuleCompiler;
import org.drools.spi.Consequence;
import org.drools.spi.ConsequenceException;
import org.drools.spi.DefaultKnowledgeHelper;
import org.drools.spi.Tuple;
/**
* Java block semantics <code>Consequence</code>.
*
* @author <a href="mailto:bob@werken.com">bob@werken.com </a>
*/
public class JavaBlockConsequence
implements
Serializable,
Consequence,
SemanticConsequence
{
private final static String semanticType = "java";
private final String name;
private final String block;
private final Rule rule;
private final Declaration[] declarations;
private ConsequenceInvoker consequenceInvoker;
protected final String thrownException = "java.lang.Exception";
// ------------------------------------------------------------
// Constructors
// ------------------------------------------------------------
/**
* Construct.
*
* @param block
* The statement block.
* @param rule
* The rule.
*/
public JavaBlockConsequence(String name,
String block,
Rule rule) throws Exception
{
this.name = name;
this.block = block;
this.rule = rule;
List declarations = rule.getParameterDeclarations();
this.declarations = (Declaration[]) declarations.toArray( new Declaration[declarations.size()] );
}
// ------------------------------------------------------------
// Instance methods
// ------------------------------------------------------------
public String getSemanticType()
{
return semanticType;
}
public boolean isExceptionThrown()
{
return true;
}
public String getThrownException()
{
return this.thrownException;
}
public String getName()
{
return this.name;
}
public String getText()
{
return this.block;
}
public SemanticRuleCompiler getSemanticRuleCompiler()
{
return JavaSemanticRuleCompiler.getInstance();
}
public Declaration[] getTupleMembers()
{
return this.declarations;
}
public void setInvoker(Invoker invoker)
{
this.consequenceInvoker = (ConsequenceInvoker) invoker;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// org.drools.spi.Consequence
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
/**
* Execute the consequence for the supplied matching <code>Tuple</code>.
*
* @param tuple
* The matching tuple.
* @param workingMemory
* The working memory session.
*
* @throws ConsequenceException
* If an error occurs while attempting to invoke the consequence.
*/
public void invoke(Tuple tuple) throws ConsequenceException
{
try
{
this.consequenceInvoker.invoke( tuple,
this.declarations,
new DefaultKnowledgeHelper( this.rule,
tuple ),
tuple.getWorkingMemory().getApplicationDataMap() );
}
catch ( Exception e )
{
throw new ConsequenceException( e,
this.rule,
this.block );
}
}
public String toString()
{
return "[Consequence: " + this.block + "]";
}
}