/*
 * Copyright 2015 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * 
 *      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.jbpm.compiler.xml.processes;

import java.util.ArrayList;
import java.util.HashSet;

import org.drools.core.xml.BaseAbstractHandler;
import org.drools.core.xml.ExtensibleXmlParser;
import org.drools.core.xml.Handler;
import org.jbpm.process.core.Process;
import org.jbpm.workflow.core.impl.WorkflowProcessImpl;
import org.w3c.dom.Element;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;

public class FunctionImportHandler extends BaseAbstractHandler
    implements
    Handler {
    public FunctionImportHandler() {
        if ( (this.validParents == null) && (this.validPeers == null) ) {
            this.validParents = new HashSet();
            this.validParents.add( Process.class );

            this.validPeers = new HashSet();         
            this.validPeers.add( null );            

            this.allowNesting = false;
        }
    }
    
    public Object start(final String uri,
                        final String localName,
                        final Attributes attrs,
                        final ExtensibleXmlParser parser) throws SAXException {
        parser.startElementBuilder( localName,
                                    attrs );
        
        WorkflowProcessImpl  process = ( WorkflowProcessImpl ) parser.getParent();        
        
        final String name = attrs.getValue( "name" );        
        emptyAttributeCheck( localName, "name", name, parser );       
        
        java.util.List<String> list = process.getFunctionImports();
        if ( list == null ) {
            list = new ArrayList<String>();
            process.setFunctionImports( list );
        }
        list.add( name );
        
        return null;
    }    
    
    public Object end(final String uri,
                      final String localName,
                      final ExtensibleXmlParser parser) throws SAXException {
        final Element element = parser.endElementBuilder();
        return null;
    }

    public Class generateNodeFor() {
        return null;
    }    

}
