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.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.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
/**
* @author fmeyer
*/
class QualifiedIdentifierRestrictionHandler extends BaseAbstractHandler
implements
Handler {
QualifiedIdentifierRestrictionHandler(final XmlPackageReader xmlPackageReader) {
this.xmlPackageReader = xmlPackageReader;
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) throws SAXException {
this.xmlPackageReader.startConfiguration( localName,
attrs );
final String evaluator = attrs.getValue( "evaluator" );
if ( evaluator == null || evaluator.trim().equals( "" ) ) {
throw new SAXParseException( "<bound-variable> requires an 'evaluator' attribute",
this.xmlPackageReader.getLocator() );
}
// qualifiedIdentifierRestricionDescr.set
final QualifiedIdentifierRestrictionDescr qualifiedIdentifierRestricionDescr = new QualifiedIdentifierRestrictionDescr( evaluator,
null );
return qualifiedIdentifierRestricionDescr;
}
public Object end(final String uri,
final String localName) throws SAXException {
final Configuration config = this.xmlPackageReader.endConfiguration();
final QualifiedIdentifierRestrictionDescr qualifiedIdentifierRestricionDescr = (QualifiedIdentifierRestrictionDescr) this.xmlPackageReader.getCurrent();
final String expression = config.getText();
if ( expression == null || expression.trim().equals( "" ) ) {
throw new SAXParseException( "<qualified-identifier-restriction> must have an expression content",
this.xmlPackageReader.getLocator() );
}
qualifiedIdentifierRestricionDescr.setText( expression );
final LinkedList parents = this.xmlPackageReader.getParents();
final ListIterator it = parents.listIterator( parents.size() );
it.previous();
final Object parent = it.previous();
if ( parent instanceof FieldConstraintDescr ) {
final FieldConstraintDescr fieldConstraintDescr = (FieldConstraintDescr) parent;
fieldConstraintDescr.addRestriction( qualifiedIdentifierRestricionDescr );
} else if ( parent instanceof RestrictionConnectiveDescr ) {
final RestrictionConnectiveDescr restrictionConDescr = (RestrictionConnectiveDescr) parent;
restrictionConDescr.addRestriction( qualifiedIdentifierRestricionDescr );
}
return null;
}
public Class generateNodeFor() {
return QualifiedIdentifierRestrictionDescr.class;
}
}