/**
 * Copyright (c) 2010 Yahoo! Inc. All rights reserved.
 * 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. See accompanying LICENSE file.
 */
package org.apache.oozie.workflow.lite;

import java.util.ArrayList;
import java.util.List;

//TODO javadoc
public class ForkNodeDef extends NodeDef {

    public static final String FORK_COUNT_PREFIX = "workflow.fork.";

    ForkNodeDef() {
    }

    public ForkNodeDef(String name, List<String> transitions) {
        super(name, null, ForkNodeHandler.class, transitions);
    }

    public static class ForkNodeHandler extends NodeHandler {

        public boolean enter(Context context) {
            return true;
        }

        // the return list contains (parentExecutionPath/transition#transition)+
        public List<String> multiExit(Context context) {
            List<String> transitions = context.getNodeDef().getTransitions();
            context.setVar(FORK_COUNT_PREFIX + context.getExecutionPath(), "" + transitions.size());

            List<String> fullTransitions = new ArrayList<String>(transitions.size());

            for (String transition : transitions) {
                String childExecutionPath = context.createExecutionPath(transition);
                String fullTransition = context.createFullTransition(childExecutionPath, transition);
                fullTransitions.add(fullTransition);
            }
            return fullTransitions;
        }

        public String exit(Context context) {
            throw new UnsupportedOperationException();
        }

        public void kill(Context context) {
        }

        public void fail(Context context) {
        }

    }

}