/*
    * Copyright 2009-2010 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.admin.integration;
  
  import org.springframework.batch.core.configuration.DuplicateJobException;
  import org.springframework.core.io.ByteArrayResource;
  import org.springframework.core.io.Resource;
  import org.springframework.integration.annotation.MessageEndpoint;
  import org.springframework.integration.annotation.ServiceActivator;
  import org.springframework.util.StringUtils;
  
  /**
   * Adapt a {@link JobConfigurationRequest} to a Spring {@link Resource} so it
   * can be handled by a generic consumer.
   * 
   * @author Dave Syer
   * 
   */
  @MessageEndpoint
  public class JobConfigurationRequestToResourceAdapter {
  
  	private static final String EMPTY_BEANS = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>"
  			+ "<beans xmlns=\"http://www.springframework.org/schema/beans\""
  			+ " xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\""
  			+ " xsi:schemaLocation=\"http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd\"/>";
  
  	@ServiceActivator
  	public Resource adapt(JobConfigurationRequest request) throws DuplicateJobException {
  
  		String filename = request.getFilename();
  		if (!StringUtils.hasText(request.getXml())) {
  			return new ByteArrayResource(EMPTY_BEANS.getBytes(), filename + ":empty-string");
  		}
  		return new ByteArrayResource(request.getXml().getBytes(), filename);
  
  	}
  
  }