/*
* 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 org.drools.lang.descr.FunctionDescr;
import org.drools.lang.descr.PackageDescr;
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 FunctionHandler extends BaseAbstractHandler
implements
Handler {
public FunctionHandler() {
}
public Object start(final String uri,
final String localName,
final Attributes attrs,
final ExtensibleXmlParser parser) throws SAXException {
parser.startElementBuilder( localName,
attrs );
final String name = attrs.getValue( "name" );
final String returnType = attrs.getValue( "return-type" );
emptyAttributeCheck( localName, "name", name, parser );
emptyAttributeCheck( localName, "return-type", returnType, parser );
return new FunctionDescr( name, returnType );
}
public Object end(final String uri,
final String localName,
final ExtensibleXmlParser parser) throws SAXException {
final Element element = parser.endElementBuilder();
FunctionDescr functionDescr = ( FunctionDescr ) parser.getCurrent();
final NodeList parameters = element.getElementsByTagName( "parameter" );
for ( int i = 0, length = parameters.getLength(); i < length; i++ ) {
final String identifier = ((Element)parameters.item( i )).getAttribute( "identifier" );
final String type = ((Element)parameters.item( i )).getAttribute( "type" );
emptyAttributeCheck("parameter", "identifier", identifier, parser);
emptyAttributeCheck("parameter", "type", type, parser);
functionDescr.addParameter( type,
identifier );
}
// we allow empty, "", bodies - but make sure that we atleast have a body element
NodeList list = element.getElementsByTagName( "body" );
if ( list.getLength() == 0 ) {
throw new SAXParseException( "function must have a <body>",
parser.getLocator() );
}
functionDescr.setText( ((org.w3c.dom.Text)list.item( 0 ).getChildNodes().item( 0 )).getWholeText() );
final PackageDescr packageDescr = (PackageDescr) parser.getData();
packageDescr.addFunction( functionDescr );
return functionDescr;
}
public Class generateNodeFor() {
return FunctionDescr.class;
}
}