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.ConditionalElementDescr;
import org.drools.lang.descr.FieldConstraintDescr;
import org.drools.lang.descr.FromDescr;
import org.drools.lang.descr.PatternDescr;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
/**
* @author fernandomeyer
*
*/
public class FromHandler extends BaseAbstractHandler
implements
Handler {
FromHandler(final XmlPackageReader xmlPackageReader) {
this.xmlPackageReader = xmlPackageReader;
if ( (this.validParents == null) && (this.validPeers == null) ) {
this.validParents = new HashSet();
this.validParents.add( PatternDescr.class );
this.validPeers = new HashSet();
this.validPeers.add( null );
this.validPeers.add( FieldConstraintDescr.class );
this.allowNesting = false;
}
}
public Object start(final String uri,
final String localName,
final Attributes attrs) throws SAXException {
this.xmlPackageReader.startConfiguration( localName,
attrs );
final FromDescr fromDesctiptor = new FromDescr();
return fromDesctiptor;
}
public Object end(final String uri,
final String localName) throws SAXException {
final Configuration config = this.xmlPackageReader.endConfiguration();
final FromDescr fromDescr = (FromDescr) this.xmlPackageReader.getCurrent();
final LinkedList parents = this.xmlPackageReader.getParents();
final ListIterator it = parents.listIterator( parents.size() );
it.previous();
Object parent = it.previous();
final PatternDescr patternDescr = (PatternDescr) parent;
final ConditionalElementDescr parentDescr = (ConditionalElementDescr) it.previous();
if ( (config.getChild( "expression" ) != null) ) {
patternDescr.setSource( fromDescr );
}
return null;
}
public Class generateNodeFor() {
return FromDescr.class;
}
}