/*
* 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.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.drools.xml.BaseAbstractHandler;
import org.drools.xml.ExtensibleXmlParser;
import org.drools.xml.Handler;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
/**
*
* TODO To change the template for this generated type comment go to Window -
* Preferences - Java - Code Style - Code Templates
*/
public class RuleHandler extends BaseAbstractHandler
implements
Handler {
public RuleHandler() {
}
public Object start(final String uri,
final String localName,
final Attributes attrs,
final ExtensibleXmlParser parser) throws SAXException {
parser.startElementBuilder( localName,
attrs );
final String ruleName = attrs.getValue( "name" );
emptyAttributeCheck( localName,
"name",
ruleName,
parser );
final RuleDescr ruleDescr = new RuleDescr( ruleName.trim() );
return ruleDescr;
}
public Object end(final String uri,
final String localName,
final ExtensibleXmlParser parser) throws SAXException {
final Element element = parser.endElementBuilder();
final RuleDescr ruleDescr = (RuleDescr) parser.getCurrent();
final AndDescr lhs = ruleDescr.getLhs();
if ( lhs == null ) {
throw new SAXParseException( "<rule> requires a LHS",
parser.getLocator() );
}
NodeList list = element.getElementsByTagName( "rhs" );
if ( list.getLength() == 0 ) {
throw new SAXParseException( "<rule> requires a <rh> child element",
parser.getLocator() );
}
ruleDescr.setConsequence( ((org.w3c.dom.Text)list.item( 0 ).getChildNodes().item( 0 )).getWholeText() );
NodeList attributes = element.getElementsByTagName( "rule-attribute" );
for ( int i = 0, length = attributes.getLength(); i < length; i++ ) {
final String name = ((Element) attributes.item( i )).getAttribute( "name" );
emptyAttributeCheck( "rule-attribute",
"name",
name,
parser );
final String value = ((Element) attributes.item( i )).getAttribute( "value" );
ruleDescr.addAttribute( new AttributeDescr( name,
value ) );
}
((PackageDescr) parser.getData()).addRule( ruleDescr );
return ruleDescr;
}
public Class generateNodeFor() {
return RuleDescr.class;
}
}