/*
    * 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.Job;
  import org.springframework.batch.core.JobParameter;
  import org.springframework.batch.core.JobParameters;
  import org.springframework.batch.core.configuration.JobLocator;
  import org.springframework.batch.core.converter.DefaultJobParametersConverter;
  import org.springframework.batch.core.converter.JobParametersConverter;
  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.ServiceActivator;
  import org.springframework.util.Assert;
  import org.springframework.util.StringUtils;
  
  /**
   * Adapt a String to a {@link JobLaunchRequest} consisting of a reference to a
   * {@link Job} and some {@link JobParameters}. The input String is in the
   * format: <code>jobname([(key=value(,key=value)*])</code>, where
   * <ul>
   * <li>jobname = the name of a {@link Job} to launch</li>
   * <li>key = the name of a {@link JobParameter}</li>
   * <li>value = the value of the parameter</li>
   * </ul>
   * Job parameter values are optional, and if provided are separated by commas
   * and enclosed in square brackets. If no parameters are provided the empty set
   * will be used.
   * 
   * @author Dave Syer
   * 
   */
  @MessageEndpoint
  public class StringToJobLaunchRequestAdapter implements InitializingBean {
  
  	private JobLocator jobLocator;
  
  	private JobParametersConverter converter = new DefaultJobParametersConverter();
  
  	private static String PATTERN = "([\\w-_]*)(\\[(.*)\\]|.*)";
  
  	public void setJobLocator(JobLocator jobLocator) {
  		this.jobLocator = jobLocator;
  	}
  
  	public void afterPropertiesSet() throws Exception {
  		Assert.state(jobLocator != null, "A JobLocator must be provided");
  	}
  
  	@ServiceActivator
  	public JobLaunchRequest adapt(String request) throws NoSuchJobException {
  		request = request.trim();
  		Assert.isTrue(request.matches(PATTERN), "Input in wrong format ("
  				+ request + "): use jobname([(key=value(,key=value)*])");
  		String jobName = request.replaceAll(PATTERN, "$1");
  		Job job = jobLocator.getJob(jobName);
  		String paramsText = request.replaceAll(PATTERN, "$3");
  		JobParameters jobParameters = converter.getJobParameters(StringUtils
  				.splitArrayElementsIntoProperties(paramsText.split(","), "="));
  		return new JobLaunchRequest(job, jobParameters);
  	}
  }