/*
* Copyright 2011-2012 Amazon Technologies, Inc.
*
* 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://aws.amazon.com/apache2.0
*
* This file 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 com.amazonaws.services.dynamodb.datamodeling;
import java.io.StringReader;
import java.io.StringWriter;
import org.codehaus.jackson.JsonFactory;
import org.codehaus.jackson.JsonGenerator;
import org.codehaus.jackson.JsonParser;
import org.codehaus.jackson.map.MappingJsonFactory;
/**
* Simple JSON marshaller that uses Jackson mapper. It has all the limitations
* of that library, the documentation of which is available here:
* http://docs.codehaus.org/display/JACKSON/Home
*/
public class JsonMarshaller<T extends Object> implements DynamoDBMarshaller<T> {
@Override
public String marshall(T obj) {
try {
JsonFactory jsonFactory = new MappingJsonFactory();
StringWriter output = new StringWriter();
JsonGenerator jsonGenerator = jsonFactory.createJsonGenerator(output);
jsonGenerator.writeObject(obj);
return output.toString();
} catch ( Exception e ) {
throw new RuntimeException(e);
}
}
@Override
public T unmarshall(Class<T> clazz, String obj) {
try {
JsonFactory jsonFactory = new MappingJsonFactory();
JsonParser jsonParser = jsonFactory.createJsonParser(new StringReader(obj));
return jsonParser.readValueAs(clazz);
} catch ( Exception e ) {
throw new RuntimeException(e);
}
}
}