/*
    * Copyright 2006-2008 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.step.item;
  
  import java.util.List;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.springframework.batch.core.listener.ItemListenerSupport;
  
  /**
   * Default implementation of the {@link ItemListenerSupport} class that
   * writes all exceptions via commons logging. Since generics can't be used to
   * ensure the list contains exceptions, any non exceptions will be logged out by
   * calling toString on the object.
   * 
   * @author Lucas Ward
   * 
   */
  public class DefaultItemFailureHandler extends ItemListenerSupport<Object,Object> {
  
  	protected static final Log logger = LogFactory
  			.getLog(DefaultItemFailureHandler.class);
  
  	@Override
  	public void onReadError(Exception ex) {
  		try {
  			logger.error("Error encountered while reading", ex);
  		} catch (Exception exception) {
  			logger.error("Invalid type for logging: [" + exception.toString()
  					+ "]");
  		}
  	}
  
  	@Override
  	public void onWriteError(Exception ex, List<? extends Object> item) {
  		try {
  			logger.error("Error encountered while writing item: [ " + item + "]", ex);
  		} catch (Exception exception) {
  			logger.error("Invalid type for logging: [" + exception.toString()
  					+ "]");
  		}
  	}
  
  }