/*********************************************************************
* JsonLibAdapter.java
* created on 05.11.2006 by netseeker
* $Id: JsonLibAdapter.java,v 1.4 2007/11/17 10:59:17 netseeker Exp $
* $Log: JsonLibAdapter.java,v $
* Revision 1.4 2007/11/17 10:59:17 netseeker
* *** empty log message ***
*
* Revision 1.3 2007/03/25 15:03:23 netseeker
* *** empty log message ***
*
* Revision 1.2 2007/03/22 21:01:34 netseeker
* *** empty log message ***
*
* Revision 1.1 2007/02/11 15:42:20 netseeker
* *** empty log message ***
*
* Revision 1.3 2006/11/06 11:02:44 netseeker
* *** empty log message ***
*
* Revision 1.2 2006/11/05 17:13:09 netseeker
* added source documentation
*
* Revision 1.1 2006/11/05 16:33:37 netseeker
* changed adapter connection handling
* added support for JSON with different JSON-adapters (XStream,JSON-lib,MyJSON)
*
*
* ====================================================================
*
* Copyright 2005-2006 netseeker aka Michael Manske
*
* 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.
* ====================================================================
*
* This file is part of the EJOE framework.
* For more information on the author, please see
* <http://www.manskes.de/>.
*
*********************************************************************/
package de.netseeker.ejoe.adapter.json;
import java.io.InputStream;
import java.io.OutputStream;
import net.sf.json.JSON;
import net.sf.json.JSONObject;
import net.sf.json.JSONSerializer;
import net.sf.json.util.JSONUtils;
import de.netseeker.ejoe.adapter.UTF8StringAdapter;
/**
* Multimode SerializeAdapter supporting JSON via the JSON-lib. By default this adapter is write-only: It is able to
* serialize Objects to JSON but does just return JSON strings on read operations. The read mode can be switched but
* then Objects according to what JSON-lib creates will be returned.
*
* @author netseeker
* @since 0.3.9.1
* @see <a href="http://json-lib.sourceforge.net/">JSON-lib</a>
*/
public class JsonLibAdapter extends UTF8StringAdapter
{
/**
*
*/
private static final long serialVersionUID = 1L;
private boolean _writeOnly;
/**
* Creates a write-only instance of this adapter. It will write Object instances to JSON but will just return JSON
* string representations on read operations.
*/
public JsonLibAdapter()
{
this( true );
}
/**
* Creates either a write-only or a mixed-mode instance of this adapter. In write-only mode it will write Object
* instances to JSON but will just return JSON string representations on read operations. In mixed-mode Objects
* according to what JSON-lib creates will be returned on read operations.
*
* @param writeOnly whether to uses write-only mode or not
*/
public JsonLibAdapter(boolean writeOnly)
{
_writeOnly = writeOnly;
}
/*
* (non-Javadoc)
*
* @see de.netseeker.ejoe.adapter.SerializeAdapter#read(java.io.InputStream)
*/
public Object read( InputStream in ) throws Exception
{
String json = (String) super.read( in );
if ( _writeOnly )
{
return json;
}
else
{
Object result = null;
if ( json != null )
{
JSONObject jsonObject = JSONObject.fromObject( json );
if ( !jsonObject.isNullObject() )
{
if ( jsonObject.has( "uniqueName" ) )
{
result = JSONObject.toBean( jsonObject, Class.forName( jsonObject.getString( "uniqueName" ) ) );
}
else
{
result = JSONSerializer.toJava( jsonObject );
}
}
}
return result;
}
}
/*
* (non-Javadoc)
*
* @see de.netseeker.ejoe.adapter.SerializeAdapter#write(java.lang.Object, java.io.OutputStream)
*/
public void write( Object obj, OutputStream out ) throws Exception
{
JSON json = null;
if( JSONUtils.isObject( obj ))
{
json = JSONObject.fromObject( obj );
}
else
{
json = JSONSerializer.toJSON( obj );
}
super.write( json, out );
}
/*
* (non-Javadoc)
*
* @see de.netseeker.ejoe.adapter.BaseAdapter#getContentType()
*/
public String getContentType()
{
return "application/json";
}
}