/*
    * 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.repository.dao;
  
  import com.thoughtworks.xstream.converters.reflection.ReflectionProvider;
  import com.thoughtworks.xstream.io.HierarchicalStreamDriver;
  import com.thoughtworks.xstream.io.json.JettisonMappedXmlDriver;
  import com.thoughtworks.xstream.XStream;
  
  import java.util.Map;
  
  import org.springframework.beans.factory.InitializingBean;
  
  /**
   * Implementation that uses XStream and Jettison to provide serialization.
   * 
   * @author Thomas Risberg
   * @since 2.0
   */
  public class XStreamExecutionContextStringSerializer implements ExecutionContextStringSerializer, InitializingBean {
  
  	private ReflectionProvider reflectionProvider = null;
  
  	private HierarchicalStreamDriver hierarchicalStreamDriver;
  
  	private XStream xstream;
  
  	public String serialize(Map<String, Object> context) {
  		return xstream.toXML(context);
  	}
  
  	@SuppressWarnings("unchecked")
  	public Map<String, Object> deserialize(String context) {
  		return (Map<String, Object>) xstream.fromXML(context);
  	}
  
  	public void setReflectionProvider(ReflectionProvider reflectionProvider) {
  		this.reflectionProvider = reflectionProvider;
  	}
  
  	public void setHierarchicalStreamDriver(HierarchicalStreamDriver hierarchicalStreamDriver) {
  		this.hierarchicalStreamDriver = hierarchicalStreamDriver;
  	}
  
  	public void afterPropertiesSet() throws Exception {
  		init();
  	}
  
  	public synchronized void init() throws Exception {
  		if (hierarchicalStreamDriver == null) {
  			this.hierarchicalStreamDriver = new JettisonMappedXmlDriver();
  		}
  		if (reflectionProvider == null) {
  			xstream =  new XStream(hierarchicalStreamDriver);
  		}
  		else {
  			xstream = new XStream(reflectionProvider, hierarchicalStreamDriver);
  		}
  	}
  }