package org.drools.xml;
/*
* Copyright 2005 JBoss Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import java.util.HashSet;
import java.util.LinkedList;
import java.util.ListIterator;
import org.drools.lang.descr.AccumulateDescr;
import org.drools.lang.descr.BaseDescr;
import org.drools.lang.descr.PatternDescr;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
/**
* @author fernandomeyer
*/
public class AccumulateHelperHandler extends BaseAbstractHandler
implements
Handler {
AccumulateHelperHandler(final XmlPackageReader xmlPackageReader) {
this.xmlPackageReader = xmlPackageReader;
if ( (this.validParents == null) && (this.validPeers == null) ) {
this.validParents = new HashSet();
this.validParents.add( AccumulateDescr.class );
this.validPeers = new HashSet();
this.validPeers.add( null );
this.validPeers.add( PatternDescr.class );
this.validPeers.add( BaseDescr.class );
this.allowNesting = true;
}
}
public Object end(final String uri,
final String localName) throws SAXException {
final Configuration config = this.xmlPackageReader.endConfiguration();
final BaseDescr baseDescr = (BaseDescr) this.xmlPackageReader.getCurrent();
final String expression = config.getText();
if ( expression == null) {
throw new SAXParseException( "<" + localName + "> must have some content",
this.xmlPackageReader.getLocator() );
}
final LinkedList parents = this.xmlPackageReader.getParents();
final ListIterator ite = parents.listIterator( parents.size() );
ite.previous();
final Object parent = ite.previous();
final AccumulateDescr accumulate = (AccumulateDescr) parent;
if ( localName.equals( "init" ) ) accumulate.setInitCode( expression.trim() );
else if ( localName.equals( "action" ) ) accumulate.setActionCode( expression.trim() );
else if ( localName.equals( "result" ) ) accumulate.setResultCode( expression.trim() );
else if ( localName.equals( "reverse" ) ) accumulate.setReverseCode( expression.trim() );
else if ( localName.equals( "external-function" ) ) {
accumulate.setExternalFunction( true );
accumulate.setFunctionIdentifier( config.getAttribute( "evaluator" ) );
accumulate.setExpression( config.getAttribute( "expression" ) );
}
return null;
}
public Class generateNodeFor() {
return BaseDescr.class;
}
public Object start(final String uri,
final String localName,
final Attributes attrs) throws SAXException {
this.xmlPackageReader.startConfiguration( localName,
attrs );
return new BaseDescr();
}
}