/*
* 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.
*/
package org.drools.compiler.xml.rules;
import java.util.HashSet;
import org.drools.lang.descr.AndDescr;
import org.drools.lang.descr.BindingDescr;
import org.drools.lang.descr.ConditionalElementDescr;
import org.drools.lang.descr.ConnectiveDescr;
import org.drools.lang.descr.ConnectiveDescr.RestrictionConnectiveType;
import org.drools.lang.descr.ExprConstraintDescr;
import org.drools.lang.descr.FieldConstraintDescr;
import org.drools.lang.descr.OrDescr;
import org.drools.lang.descr.PatternDescr;
import org.drools.lang.descr.PredicateDescr;
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;
/**
*
* TODO To change the template for this generated type comment go to Window -
* Preferences - Java - Code Style - Code Templates
*/
public class FieldConstraintHandler extends BaseAbstractHandler
implements
Handler {
public FieldConstraintHandler() {
}
public Object start(final String uri,
final String localName,
final Attributes attrs,
final ExtensibleXmlParser parser) throws SAXException {
parser.startElementBuilder( localName,
attrs );
final String fieldName = attrs.getValue( "field-name" );
emptyAttributeCheck( localName,
"field-name",
fieldName,
parser );
final ConnectiveDescr connective = new ConnectiveDescr( RestrictionConnectiveType.AND );
connective.setParen( false );
connective.setPrefix( fieldName );
return connective;
}
public Object end(final String uri,
final String localName,
final ExtensibleXmlParser parser) throws SAXException {
final Element element = parser.endElementBuilder();
final ConnectiveDescr c = (ConnectiveDescr) parser.getCurrent();
Object p = parser.getParent();
if ( p instanceof PatternDescr ) {
StringBuilder sb = new StringBuilder();
c.buildExpression( sb );
ExprConstraintDescr expr = new ExprConstraintDescr();
expr.setExpression( sb.toString() );
final PatternDescr patternDescr = (PatternDescr) parser.getParent();
patternDescr.addConstraint( expr );
} else if ( p instanceof ConnectiveDescr ) {
((ConnectiveDescr) p).add( c );
}
return c;
}
public Class generateNodeFor() {
return ExprConstraintHandler.class;
}
}