package org.drools.compiler.xml.rules;
/*
* 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 org.drools.lang.descr.FieldConstraintDescr;
import org.drools.lang.descr.LiteralRestrictionDescr;
import org.drools.lang.descr.QualifiedIdentifierRestrictionDescr;
import org.drools.lang.descr.RestrictionConnectiveDescr;
import org.drools.lang.descr.ReturnValueRestrictionDescr;
import org.drools.lang.descr.VariableRestrictionDescr;
import org.drools.xml.BaseAbstractHandler;
import org.drools.xml.ExtensibleXmlParser;
import org.drools.xml.Handler;
import org.w3c.dom.Element;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
/**
* @author mproctor
*
* TODO To change the template for this generated type comment go to Window -
* Preferences - Java - Code Style - Code Templates
*/
public class ReturnValueRestrictionHandler extends BaseAbstractHandler
implements
Handler {
public ReturnValueRestrictionHandler() {
if ( (this.validParents == null) && (this.validPeers == null) ) {
this.validParents = new HashSet();
this.validParents.add( FieldConstraintDescr.class );
this.validParents.add( RestrictionConnectiveDescr.class );
this.validPeers = new HashSet();
this.validPeers.add( null );
this.validPeers.add( LiteralRestrictionDescr.class );
this.validPeers.add( ReturnValueRestrictionDescr.class );
this.validPeers.add( VariableRestrictionDescr.class );
this.validPeers.add( RestrictionConnectiveDescr.class );
this.validPeers.add( QualifiedIdentifierRestrictionDescr.class );
this.allowNesting = false;
}
}
public Object start(final String uri,
final String localName,
final Attributes attrs,
final ExtensibleXmlParser parser) throws SAXException {
parser.startElementBuilder( localName,
attrs );
final String evaluator = attrs.getValue( "evaluator" );
emptyAttributeCheck( localName, "evaluator", evaluator, parser );
final ReturnValueRestrictionDescr returnValueDescr = new ReturnValueRestrictionDescr( evaluator );
return returnValueDescr;
}
public Object end(final String uri,
final String localName,
final ExtensibleXmlParser parser) throws SAXException {
final Element element = parser.endElementBuilder();
final ReturnValueRestrictionDescr returnValueDescr = (ReturnValueRestrictionDescr) parser.getCurrent();
final String expression =((org.w3c.dom.Text)element.getChildNodes().item( 0 )).getWholeText();
emptyContentCheck( localName, expression, parser );
returnValueDescr.setContent( expression );
final Object parent = parser.getParent();
if ( parent instanceof FieldConstraintDescr ) {
final FieldConstraintDescr fieldConstraintDescr = (FieldConstraintDescr) parent;
fieldConstraintDescr.addRestriction( returnValueDescr );
} else if ( parent instanceof RestrictionConnectiveDescr ) {
final RestrictionConnectiveDescr rcDescr = (RestrictionConnectiveDescr) parent;
rcDescr.addRestriction( returnValueDescr );
}
return returnValueDescr;
}
public Class generateNodeFor() {
return ReturnValueRestrictionDescr.class;
}
}