/*
 * 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.oodt.cas.workflow.engine.processor;

//JDK imports
import java.util.Collections;
import java.util.List;
import java.util.Vector;

import org.apache.oodt.cas.workflow.lifecycle.WorkflowLifecycleManager;
import org.apache.oodt.cas.workflow.structs.WorkflowInstance;

/**
 * 
 * WorkflowProcessor which handles running sub-processors in sequence.
 * 
 * @author bfoster
 * @author mattmann
 * @version $Revision$
 */
public class SequentialProcessor extends WorkflowProcessor {

  public SequentialProcessor(WorkflowLifecycleManager lifecycleManager, WorkflowInstance instance) {
    super(lifecycleManager, instance);
  }

  @Override
  public List<WorkflowProcessor> getRunnableSubProcessors() {
    WorkflowProcessor nextWP = this.getNext();
    if (nextWP != null)
      return Collections.singletonList(nextWP);
    else
      return new Vector<WorkflowProcessor>();
  }

  @Override
  public void handleSubProcessorMetadata(WorkflowProcessor workflowProcessor) {
    // do nothing
  }

  private WorkflowProcessor getNext() {
    for (WorkflowProcessor wp : this.getSubProcessors())
      if (!wp.getWorkflowInstance().getState().getCategory().getName()
          .equals("done") && !wp.getWorkflowInstance().getState().getName().equals("Executing"))
        return wp;
    return null;
  }

}