/*
* Copyright (C) 2014 Divide.io
*
* 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 io.divide.server.dao;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import javax.ws.rs.Consumes;
import javax.ws.rs.Produces;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyReader;
import javax.ws.rs.ext.MessageBodyWriter;
import javax.ws.rs.ext.Provider;
import java.io.*;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
@Provider
@Produces(MediaType.APPLICATION_JSON)
@Consumes(MediaType.APPLICATION_JSON)
public class GsonMessageBodyHandler implements MessageBodyWriter<Object>,
MessageBodyReader<Object> {
private static final String UTF_8 = "UTF-8";
private Gson gson;
private Gson getGson() {
if (gson == null) {
final GsonBuilder gsonBuilder = new GsonBuilder();
gsonBuilder.enableComplexMapKeySerialization();
// gsonBuilder.setPrettyPrinting();
gson = gsonBuilder.create();
}
return gson;
}
@Override
public boolean isReadable(Class<?> type, Type genericType,
java.lang.annotation.Annotation[] annotations, MediaType mediaType) {
return true;
}
@Override
public Object readFrom(Class<Object> type, Type genericType, Annotation[] annotations, MediaType mediaType, MultivaluedMap<String, String> httpHeaders, InputStream entityStream) throws IOException {
InputStreamReader streamReader = new InputStreamReader(entityStream, UTF_8);
try {
Type jsonType;
if (type.equals(genericType)) {
jsonType = type;
} else {
jsonType = genericType;
}
return getGson().fromJson(streamReader, jsonType);
} finally {
streamReader.close();
}
}
@Override
public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
return true;
}
@Override
public long getSize(Object object, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
return -1;
}
@Override
public void writeTo(Object object, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType, MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream) throws IOException, WebApplicationException {
OutputStreamWriter writer = new OutputStreamWriter(entityStream, UTF_8);
try {
Type jsonType;
if (type.equals(genericType)) {
jsonType = type;
} else {
jsonType = genericType;
}
getGson().toJson(object, jsonType, writer);
} finally {
writer.close();
}
}
}