/*
    * 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.List;
  
  import org.springframework.batch.core.ChunkListener;
  import org.springframework.batch.core.ExitStatus;
  import org.springframework.batch.core.ItemProcessListener;
  import org.springframework.batch.core.ItemReadListener;
  import org.springframework.batch.core.ItemWriteListener;
  import org.springframework.batch.core.SkipListener;
  import org.springframework.batch.core.StepExecution;
  import org.springframework.batch.core.StepExecutionListener;
  import org.springframework.batch.core.StepListener;
  import org.springframework.batch.core.scope.context.ChunkContext;
  import org.springframework.batch.item.ItemStream;
  
  /**
   * @author Dave Syer
   * @author Michael Minella
   */
  public class MulticasterBatchListener<T, S> implements StepExecutionListener, ChunkListener, ItemReadListener<T>,
  ItemProcessListener<T, S>, ItemWriteListener<S>, SkipListener<T, S> {
  
  	private CompositeStepExecutionListener stepListener = new CompositeStepExecutionListener();
  
  	private CompositeChunkListener chunkListener = new CompositeChunkListener();
  
  	private CompositeItemReadListener<T> itemReadListener = new CompositeItemReadListener<T>();
  
  	private CompositeItemProcessListener<T, S> itemProcessListener = new CompositeItemProcessListener<T, S>();
  
  	private CompositeItemWriteListener<S> itemWriteListener = new CompositeItemWriteListener<S>();
  
  	private CompositeSkipListener<T, S> skipListener = new CompositeSkipListener<T, S>();
  
  	/**
  	 * Initialise the listener instance.
  	 */
  	public MulticasterBatchListener() {
  		super();
  	}
  
  	/**
  	 * Register each of the objects as listeners. Once registered, calls to the
  	 * {@link MulticasterBatchListener} broadcast to the individual listeners.
  	 *
  	 * @param listeners listener objects of types known to the multicaster.
  	 */
  	public void setListeners(List<? extends StepListener> listeners) {
  		for (StepListener stepListener : listeners) {
  			register(stepListener);
  		}
  	}
  
  	/**
  	 * Register the listener for callbacks on the appropriate interfaces
  	 * implemented. Any {@link StepListener} can be provided, or an
  	 * {@link ItemStream}. Other types will be ignored.
  	 */
  	public void register(StepListener listener) {
  		if (listener instanceof StepExecutionListener) {
  			this.stepListener.register((StepExecutionListener) listener);
  		}
  		if (listener instanceof ChunkListener) {
  			this.chunkListener.register((ChunkListener) listener);
  		}
  		if (listener instanceof ItemReadListener<?>) {
  			@SuppressWarnings("unchecked")
  			ItemReadListener<T> itemReadListener = (ItemReadListener<T>) listener;
  			this.itemReadListener.register(itemReadListener);
  		}
  		if (listener instanceof ItemProcessListener<?, ?>) {
  			@SuppressWarnings("unchecked")
  			ItemProcessListener<T, S> itemProcessListener = (ItemProcessListener<T, S>) listener;
  			this.itemProcessListener.register(itemProcessListener);
  		}
  		if (listener instanceof ItemWriteListener<?>) {
  			@SuppressWarnings("unchecked")
  			ItemWriteListener<S> itemWriteListener = (ItemWriteListener<S>) listener;
  			this.itemWriteListener.register(itemWriteListener);
  		}
  		if (listener instanceof SkipListener<?, ?>) {
  			@SuppressWarnings("unchecked")
  			SkipListener<T, S> skipListener = (SkipListener<T, S>) listener;
 			this.skipListener.register(skipListener);
 		}
 	}
 
 	/**
 	 * @param item
 	 * @param result
 	 * @see org.springframework.batch.core.listener.CompositeItemProcessListener#afterProcess(java.lang.Object,
 	 * java.lang.Object)
 	 */
 	@Override
 	public void afterProcess(T item, S result) {
 		try {
 			itemProcessListener.afterProcess(item, result);
 		}
 		catch (RuntimeException e) {
 			throw new StepListenerFailedException("Error in afterProcess.", e);
 		}
 	}
 
 	/**
 	 * @param item
 	 * @see org.springframework.batch.core.listener.CompositeItemProcessListener#beforeProcess(java.lang.Object)
 	 */
 	@Override
 	public void beforeProcess(T item) {
 		try {
 			itemProcessListener.beforeProcess(item);
 		}
 		catch (RuntimeException e) {
 			throw new StepListenerFailedException("Error in beforeProcess.", e);
 		}
 	}
 
 	/**
 	 * @param item
 	 * @param ex
 	 * @see org.springframework.batch.core.listener.CompositeItemProcessListener#onProcessError(java.lang.Object,
 	 * java.lang.Exception)
 	 */
 	@Override
 	public void onProcessError(T item, Exception ex) {
 		try {
 			itemProcessListener.onProcessError(item, ex);
 		}
 		catch (RuntimeException e) {
 			throw new StepListenerFailedException("Error in onProcessError.", e);
 		}
 	}
 
 	/**
 	 * @see org.springframework.batch.core.listener.CompositeStepExecutionListener#afterStep(StepExecution)
 	 */
 	@Override
 	public ExitStatus afterStep(StepExecution stepExecution) {
 		try {
 			return stepListener.afterStep(stepExecution);
 		}
 		catch (RuntimeException e) {
 			throw new StepListenerFailedException("Error in afterStep.", e);
 		}
 	}
 
 	/**
 	 * @param stepExecution
 	 * @see org.springframework.batch.core.listener.CompositeStepExecutionListener#beforeStep(org.springframework.batch.core.StepExecution)
 	 */
 	@Override
 	public void beforeStep(StepExecution stepExecution) {
 		try {
 			stepListener.beforeStep(stepExecution);
 		}
 		catch (RuntimeException e) {
 			throw new StepListenerFailedException("Error in beforeStep.", e);
 		}
 	}
 
 	/**
 	 *
 	 * @see org.springframework.batch.core.listener.CompositeChunkListener#afterChunk(ChunkContext context)
 	 */
 	@Override
 	public void afterChunk(ChunkContext context) {
 		try {
 			chunkListener.afterChunk(context);
 		}
 		catch (RuntimeException e) {
 			throw new StepListenerFailedException("Error in afterChunk.", e);
 		}
 	}
 
 	/**
 	 *
 	 * @see org.springframework.batch.core.listener.CompositeChunkListener#beforeChunk(ChunkContext context)
 	 */
 	@Override
 	public void beforeChunk(ChunkContext context) {
 		try {
 			chunkListener.beforeChunk(context);
 		}
 		catch (RuntimeException e) {
 			throw new StepListenerFailedException("Error in beforeChunk.", e);
 		}
 	}
 
 	/**
 	 * @param item
 	 * @see org.springframework.batch.core.listener.CompositeItemReadListener#afterRead(java.lang.Object)
 	 */
 	@Override
 	public void afterRead(T item) {
 		try {
 			itemReadListener.afterRead(item);
 		}
 		catch (RuntimeException e) {
 			throw new StepListenerFailedException("Error in afterRead.", e);
 		}
 	}
 
 	/**
 	 *
 	 * @see org.springframework.batch.core.listener.CompositeItemReadListener#beforeRead()
 	 */
 	@Override
 	public void beforeRead() {
 		try {
 			itemReadListener.beforeRead();
 		}
 		catch (RuntimeException e) {
 			throw new StepListenerFailedException("Error in beforeRead.", e);
 		}
 	}
 
 	/**
 	 * @param ex
 	 * @see org.springframework.batch.core.listener.CompositeItemReadListener#onReadError(java.lang.Exception)
 	 */
 	@Override
 	public void onReadError(Exception ex) {
 		try {
 			itemReadListener.onReadError(ex);
 		}
 		catch (RuntimeException e) {
 			throw new StepListenerFailedException("Error in onReadError.", e);
 		}
 	}
 
 	/**
 	 *
 	 * @see ItemWriteListener#afterWrite(List)
 	 */
 	@Override
 	public void afterWrite(List<? extends S> items) {
 		try {
 			itemWriteListener.afterWrite(items);
 		}
 		catch (RuntimeException e) {
 			throw new StepListenerFailedException("Error in afterWrite.", e);
 		}
 	}
 
 	/**
 	 * @param items
 	 * @see ItemWriteListener#beforeWrite(List)
 	 */
 	@Override
 	public void beforeWrite(List<? extends S> items) {
 		try {
 			itemWriteListener.beforeWrite(items);
 		}
 		catch (RuntimeException e) {
 			throw new StepListenerFailedException("Error in beforeWrite.", e);
 		}
 	}
 
 	/**
 	 * @param ex
 	 * @param items
 	 * @see ItemWriteListener#onWriteError(Exception, List)
 	 */
 	@Override
 	public void onWriteError(Exception ex, List<? extends S> items) {
 		try {
 			itemWriteListener.onWriteError(ex, items);
 		}
 		catch (RuntimeException e) {
 			throw new StepListenerFailedException("Error in onWriteError.", e);
 		}
 	}
 
 	/**
 	 * @param t
 	 * @see org.springframework.batch.core.listener.CompositeSkipListener#onSkipInRead(java.lang.Throwable)
 	 */
 	@Override
 	public void onSkipInRead(Throwable t) {
 		skipListener.onSkipInRead(t);
 	}
 
 	/**
 	 * @param item
 	 * @param t
 	 * @see org.springframework.batch.core.listener.CompositeSkipListener#onSkipInWrite(java.lang.Object,
 	 * java.lang.Throwable)
 	 */
 	@Override
 	public void onSkipInWrite(S item, Throwable t) {
 		skipListener.onSkipInWrite(item, t);
 	}
 
 	/**
 	 * @param item
 	 * @param t
 	 * @see org.springframework.batch.core.listener.CompositeSkipListener#onSkipInProcess(Object,
 	 * Throwable)
 	 */
 	@Override
 	public void onSkipInProcess(T item, Throwable t) {
 		skipListener.onSkipInProcess(item, t);
 	}
 
 	@Override
 	public void afterChunkError(ChunkContext context) {
 		try {
 			chunkListener.afterChunkError(context);
 		}
 		catch (RuntimeException e) {
 			throw new StepListenerFailedException("Error in afterFailedChunk.", e);
 		}
 	}
 }