/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.ode.bpel.compiler.bom;

import java.util.Collections;
import java.util.List;

import org.w3c.dom.Element;

/**
 * Interface common to all BPEL activities. This interface provides methods for
 * manipulating the so-called "common attributes" such as source and target
 * links, activity name, and supress join failure flag.
 */
public class Activity extends JoinFailureSuppressor {

    public Activity(Element el) {
        super(el);
    }
    
    public String getName() {
        return getAttribute("name", null);
    }

    /**
     * Get the join condition.
     * 
     * @return the join condition
     */
    public Expression getJoinCondition() {
        if (is11()) {
            return isAttributeSet("joinCondition") 
                ? new Expression11(getElement(),getElement().getAttributeNode("joinCondition")) : null;
        }
        
        Targets targets = getFirstChild(Targets.class);
        return targets == null ? null : (Expression) targets.getFirstChild(Expression.class);
    }

    /**
     * Get the {@link LinkSource}s for this activity.
     * 
     * @return set of {@link LinkSource}s
     */
    public List<LinkSource> getLinkSources() {
        if (is11()) {
            return getChildren(LinkSource.class);
        }
        
        Sources sources = getFirstChild(Sources.class);
        if (sources == null)
            return Collections.emptyList();
        return sources.getChildren(LinkSource.class);
    }

    /**
     * Get the {@link LinkTarget}s for this activity.
     * 
     * @return set of {@link LinkTarget}s
     */
    public List<LinkTarget> getLinkTargets() {
        if (is11()) {
            return getChildren(LinkTarget.class);
        }

        Targets targets = getFirstChild(Targets.class);
        if (targets == null )
            return  Collections.emptyList() ;
        
        return targets.getChildren(LinkTarget.class);
        
    }
}