/*
* $Id: RuleHandler.java,v 1.6 2005/11/07 21:34:08 mproctor Exp $
*
* Copyright 2001-2003 (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
* 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.
*
*/
package org.drools.io;
import java.util.HashSet;
import org.drools.rule.ApplicationData;
import org.drools.rule.Rule;
import org.drools.rule.RuleConstructionException;
import org.drools.rule.RuleSet;
import org.drools.smf.Configuration;
import org.drools.smf.FactoryException;
import org.drools.smf.RuleFactory;
import org.drools.smf.SemanticModule;
import org.drools.spi.Functions;
import org.drools.spi.ImportEntry;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
/**
* @author mproctor
*
* TODO To change the template for this generated type comment go to Window -
* Preferences - Java - Code Style - Code Templates
*/
class RuleHandler extends BaseAbstractHandler
implements
Handler
{
RuleHandler(RuleSetReader ruleSetReader)
{
this.ruleSetReader = ruleSetReader;
if ( (this.validParents == null) && (this.validPeers == null) )
{
this.validParents = new HashSet( );
this.validParents.add( RuleSet.class );
this.validPeers = new HashSet( );
this.validPeers.add( null );
this.validPeers.add( Rule.class );
this.validPeers.add( ImportEntry.class );
this.validPeers.add( ApplicationData.class );
this.validPeers.add( Functions.class );
this.allowNesting = false;
}
}
public Object start(String uri,
String localName,
Attributes attrs) throws SAXException
{
SemanticModule module = this.ruleSetReader.lookupSemanticModule( uri,
localName );
RuleFactory factory = module.getRuleFactory( localName );
this.ruleSetReader.startConfiguration( localName,
attrs );
Configuration config = this.ruleSetReader.endConfiguration( );
Rule rule;
try
{
rule = factory.newRule( this.ruleSetReader.getRuleSet( ),
this.ruleSetReader.getFactoryContext( ),
config );
startRule( rule,
attrs );
}
catch ( FactoryException e )
{
throw new SAXParseException( "error constructing rule",
this.ruleSetReader.getLocator( ),
e );
}
return rule;
}
private void startRule(Rule rule,
Attributes attrs) throws SAXException
{
String salienceStr = attrs.getValue( "salience" );
String noLoopStr = attrs.getValue( "no-loop" );
String xorGroup = attrs.getValue( "xor-group" );
String ruleDesc = attrs.getValue( "description" );
if ( !(salienceStr == null || salienceStr.trim( ).equals( "" )) )
{
try
{
int salience = Integer.parseInt( salienceStr.trim( ) );
rule.setSalience( salience );
}
catch ( NumberFormatException e )
{
throw new SAXParseException( "invalid number value for 'salience' attribute: " + salienceStr.trim( ),
this.ruleSetReader.getLocator( ) );
}
}
if ( !(noLoopStr == null || noLoopStr.trim( ).equals( "" )) )
{
try
{
boolean noLoop = new Boolean( noLoopStr.trim( ) ).booleanValue( );
rule.setNoLoop( noLoop );
}
catch ( NumberFormatException e )
{
throw new SAXParseException( "invalid boolean value for 'no-loop' attribute: " + salienceStr.trim( ),
this.ruleSetReader.getLocator( ) );
}
}
if ( !(xorGroup == null || xorGroup.trim( ).equals( "" )) )
{
rule.setXorGroup( xorGroup );
}
if ( !(ruleDesc == null || ruleDesc.trim( ).equals( "" )) )
{
rule.setDocumentation( ruleDesc );
}
rule.setImporter( this.ruleSetReader.getRuleSet( ).getImporter( ) );
rule.setApplicationData( this.ruleSetReader.getRuleSet( ).getApplicationData( ) );
}
public Object end(String uri,
String localName) throws SAXException
{
try
{
this.ruleSetReader.getRuleSet( ).addRule( (Rule) this.ruleSetReader.getParents( ).getLast( ) );
}
catch ( RuleConstructionException e )
{
throw new SAXParseException( "error adding rule",
this.ruleSetReader.getLocator( ),
e );
}
return null;
}
public Class generateNodeFor()
{
return Rule.class;
}
}