// Copyright 2006 The Apache Software Foundation
//
// 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.apache.tapestry.markup;
import java.io.PrintWriter;
import org.apache.hivemind.util.Defense;
import org.apache.tapestry.json.IJSONWriter;
import org.apache.tapestry.json.JSONArray;
import org.apache.tapestry.json.JSONObject;
/**
* Implementation of {@link IJSONWriter}.
*
* @author jkuhnert
*/
public class JSONWriterImpl implements IJSONWriter
{
/** Outputstream writer. */
protected PrintWriter _writer;
/**
* Delegate object that handles object json renders.
*/
private JSONObject _json;
/**
* Delegate array object that handles object array json renders.
*/
private JSONArray _array;
/**
* Creates a new instance that will write all content to
* the specified {@link PrintWriter}.
*
* @param writer The outputstream to write to.
*/
public JSONWriterImpl(PrintWriter writer)
{
Defense.notNull(writer, "writer");
_writer = writer;
}
/**
*
* {@inheritDoc}
*/
public void close()
{
if (_json != null && _json.length() > 0) {
_writer.write(_json.toString());
}
if (_array != null && _array.length() > 0) {
_writer.write(_array.toString());
}
_writer.flush();
_writer.close();
}
/**
* {@inheritDoc}
*/
public JSONObject object()
{
if (_json == null)
_json = new JSONObject();
return _json;
}
/**
* {@inheritDoc}
*/
public JSONArray array()
{
if (_array == null)
_array = new JSONArray();
return _array;
}
/**
* The outputstream being used to write this
* instance's content.
*
* @return The writer being written to.
*/
protected PrintWriter getWriter()
{
return _writer;
}
}