/*
* Copyright (c) 2007, Rickard Öberg. All Rights Reserved.
* Copyright (c) 2010, Niclas Hehdman. All Rights Reserved.
* Copyright (c) 2012, Paul Merlin. All Rights Reserved.
*
* 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.qi4j.valueserialization.orgjson;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import org.json.JSONWriter;
import org.qi4j.spi.value.ValueSerializerAdapter;
import org.qi4j.valueserialization.orgjson.OrgJsonValueSerializer.OrgJsonOutput;
/**
* ValueSerializer producing Values state as JSON documents using org.json.
*/
public class OrgJsonValueSerializer
extends ValueSerializerAdapter<OrgJsonOutput>
{
/**
* Helper to pass around the Writer alongside the JSONWriter so we can flush it onSerializationEnd.
*
* This is needed because the org.json package do not allow to get a handle on the Writer from a JSONWriter.
*/
public static class OrgJsonOutput
{
private final Writer writer;
private final JSONWriter json;
private OrgJsonOutput( Writer writer, JSONWriter json )
{
this.writer = writer;
this.json = json;
}
}
//
// Serialization
//
@Override
protected OrgJsonOutput adaptOutput( OutputStream output )
throws Exception
{
Writer writer = new OutputStreamWriter( output, "UTF-8" );
JSONWriter json = new JSONWriter( writer );
return new OrgJsonOutput( writer, json );
}
@Override
protected void onSerializationEnd( Object object, OrgJsonOutput output )
throws Exception
{
output.writer.flush();
}
@Override
protected void onArrayStart( OrgJsonOutput output )
throws Exception
{
output.json.array();
}
@Override
protected void onArrayEnd( OrgJsonOutput output )
throws Exception
{
output.json.endArray();
}
@Override
protected void onObjectStart( OrgJsonOutput output )
throws Exception
{
output.json.object();
}
@Override
protected void onObjectEnd( OrgJsonOutput output )
throws Exception
{
output.json.endObject();
}
@Override
protected void onFieldStart( OrgJsonOutput output, String fieldName )
throws Exception
{
output.json.key( fieldName );
}
@Override
protected void onValue( OrgJsonOutput output, Object value )
throws Exception
{
output.json.value( value );
}
}