/*
    * Copyright 2006-2013 the original author or authors.
    *
    * 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.springframework.batch.core.listener;
  
  import java.util.Arrays;
  import java.util.Iterator;
  
  import org.springframework.batch.core.ExitStatus;
  import org.springframework.batch.core.StepExecution;
  import org.springframework.batch.core.StepExecutionListener;
  import org.springframework.core.Ordered;
  
  /**
   * @author Lucas Ward
   * @author Dave Syer
   *
   */
  public class CompositeStepExecutionListener implements StepExecutionListener {
  
  	private OrderedComposite<StepExecutionListener> list = new OrderedComposite<StepExecutionListener>();
  
  	/**
  	 * Public setter for the listeners.
  	 *
  	 * @param listeners
  	 */
  	public void setListeners(StepExecutionListener[] listeners) {
  		list.setItems(Arrays.asList(listeners));
  	}
  
  	/**
  	 * Register additional listener.
  	 *
  	 * @param stepExecutionListener
  	 */
  	public void register(StepExecutionListener stepExecutionListener) {
  		list.add(stepExecutionListener);
  	}
  
  	/**
  	 * Call the registered listeners in reverse order, respecting and
  	 * prioritizing those that implement {@link Ordered}.
  	 * @see org.springframework.batch.core.StepExecutionListener#afterStep(StepExecution)
  	 */
  	@Override
  	public ExitStatus afterStep(StepExecution stepExecution) {
  		for (Iterator<StepExecutionListener> iterator = list.reverse(); iterator.hasNext();) {
  			StepExecutionListener listener = iterator.next();
  			ExitStatus close = listener.afterStep(stepExecution);
  			stepExecution.setExitStatus(stepExecution.getExitStatus().and(close));
  		}
  		return stepExecution.getExitStatus();
  	}
  
  	/**
  	 * Call the registered listeners in order, respecting and prioritizing those
  	 * that implement {@link Ordered}.
  	 * @see org.springframework.batch.core.StepExecutionListener#beforeStep(StepExecution)
  	 */
  	@Override
  	public void beforeStep(StepExecution stepExecution) {
  		for (Iterator<StepExecutionListener> iterator = list.iterator(); iterator.hasNext();) {
  			StepExecutionListener listener = iterator.next();
  			listener.beforeStep(stepExecution);
  		}
  	}
  
  }