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 org.drools.lang.descr.AndDescr;
import org.drools.lang.descr.AttributeDescr;
import org.drools.lang.descr.FunctionDescr;
import org.drools.lang.descr.PackageDescr;
import org.drools.lang.descr.QueryDescr;
import org.drools.lang.descr.RuleDescr;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
/**
* @author mproctor
*
* TODO To change the template for this generated type comment go to Window -
* Preferences - Java - Code Style - Code Templates
*/
class RuleHandler extends BaseAbstractHandler
implements
Handler {
RuleHandler(final XmlPackageReader xmlPackageReader) {
this.xmlPackageReader = xmlPackageReader;
if ( (this.validParents == null) && (this.validPeers == null) ) {
this.validParents = new HashSet();
this.validParents.add( PackageDescr.class );
this.validPeers = new HashSet();
this.validPeers.add( null );
this.validPeers.add( FunctionDescr.class );
this.validPeers.add( RuleDescr.class );
this.validPeers.add( QueryDescr.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 ruleName = attrs.getValue( "name" );
if ( ruleName == null || ruleName.trim().equals( "" ) ) {
throw new SAXParseException( "<rule> requires a 'name' attribute",
this.xmlPackageReader.getLocator() );
}
final RuleDescr ruleDescr = new RuleDescr( ruleName.trim() );
return ruleDescr;
}
public Object end(final String uri,
final String localName) throws SAXException {
final Configuration config = this.xmlPackageReader.endConfiguration();
final RuleDescr ruleDescr = (RuleDescr) this.xmlPackageReader.getCurrent();
final AndDescr lhs = ruleDescr.getLhs();
if ( lhs == null ) {
throw new SAXParseException( "<rule> requires a LHS",
this.xmlPackageReader.getLocator() );
}
final Configuration rhs = config.getChild( "rhs" );
if ( rhs == null ) {
throw new SAXParseException( "<rule> requires a <rh> child element",
this.xmlPackageReader.getLocator() );
}
ruleDescr.setConsequence( rhs.getText() );
final Configuration[] attributes = config.getChildren( "rule-attribute" );
for ( int i = 0, length = attributes.length; i < length; i++ ) {
final String name = attributes[i].getAttribute( "name" );
if ( name == null || name.trim().equals( "" ) ) {
throw new SAXParseException( "<rule-attribute> requires a 'name' attribute",
this.xmlPackageReader.getLocator() );
}
final String value = attributes[i].getAttribute( "value" );
ruleDescr.addAttribute( new AttributeDescr( name,
value ) );
}
this.xmlPackageReader.getPackageDescr().addRule( ruleDescr );
return null;
}
public Class generateNodeFor() {
return RuleDescr.class;
}
}