/*
    * 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 java.util.HashMap;
  import java.util.Map;
  
  import org.springframework.batch.admin.service.JobService;
  import org.springframework.batch.core.JobParameter;
  import org.springframework.batch.core.JobParameters;
  import org.springframework.batch.core.launch.NoSuchJobException;
  import org.springframework.batch.integration.launch.JobLaunchRequest;
  import org.springframework.beans.factory.InitializingBean;
  import org.springframework.integration.annotation.MessageEndpoint;
  import org.springframework.integration.annotation.Transformer;
  import org.springframework.util.Assert;
  
  /**
   * Adapt a {@link JobLaunchRequest} so that it picks up the job parameters from
   * the last execution if possible.
   * 
   * @author Dave Syer
   * 
   */
  @MessageEndpoint
  public class LastJobParametersJobLaunchRequestEnhancer implements InitializingBean {
  
  	private JobService jobService;
  
  	public void setJobService(JobService jobService) {
  		this.jobService = jobService;
  	}
  
  	public void afterPropertiesSet() throws Exception {
  		Assert.notNull(jobService, "A JobService must be provided");
  	}
  
  	@Transformer
  	public JobLaunchRequest adapt(JobLaunchRequest request) throws NoSuchJobException {
  
  		Map<String, JobParameter> jobParameters = request.getJobParameters().getParameters();
  		Map<String, JobParameter> oldParameters = jobService.getLastJobParameters(request.getJob().getName())
  				.getParameters();
  
  		Map<String, JobParameter> map = new HashMap<String, JobParameter>();
  
  		for (String key : oldParameters.keySet()) {
  			map.put(key, oldParameters.get(key));
  		}
  		for (String key : jobParameters.keySet()) {
  			map.put(key, jobParameters.get(key));
  		}
  
  		return new JobLaunchRequest(request.getJob(), new JobParameters(map));
  
  	}
  
  }