GsonMessageBodyHandler.java
/*
* Copyright (c) 2017, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
*
* WSO2 Inc. licenses this file to you 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.wso2.carbon.mdm.services.android.common;
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;
import static javax.ws.rs.core.MediaType.APPLICATION_JSON;
@Provider
@Produces(APPLICATION_JSON)
@Consumes(APPLICATION_JSON)
public class GsonMessageBodyHandler implements MessageBodyWriter<Object>, MessageBodyReader<Object> {
private Gson gson;
private static final String UTF_8 = "UTF-8";
public boolean isReadable(Class<?> aClass, Type type, Annotation[] annotations, MediaType mediaType) {
return true;
}
private Gson getGson() {
if (gson == null) {
final GsonBuilder gsonBuilder = new GsonBuilder();
gson = gsonBuilder.create();
}
return gson;
}
public Object readFrom(Class<Object> objectClass, Type type, Annotation[] annotations, MediaType mediaType,
MultivaluedMap<String, String> stringStringMultivaluedMap, InputStream entityStream)
throws IOException, WebApplicationException {
InputStreamReader reader = new InputStreamReader(entityStream, "UTF-8");
try {
return getGson().fromJson(reader, type);
} finally {
reader.close();
}
}
public boolean isWriteable(Class<?> aClass, Type type, Annotation[] annotations, MediaType mediaType) {
return true;
}
public long getSize(Object o, Class<?> aClass, Type type, Annotation[] annotations, MediaType mediaType) {
return -1;
}
public void writeTo(Object object, Class<?> aClass, Type type, Annotation[] annotations, MediaType mediaType,
MultivaluedMap<String, Object> stringObjectMultivaluedMap, OutputStream entityStream)
throws IOException, WebApplicationException {
OutputStreamWriter writer = new OutputStreamWriter(entityStream, UTF_8);
try {
getGson().toJson(object, type, writer);
} finally {
writer.close();
}
}
}