| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF 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.apache.hadoop.lib.wsrs; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.json.simple.JSONStreamAware; |
| |
| 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.MessageBodyWriter; |
| import javax.ws.rs.ext.Provider; |
| import java.io.IOException; |
| import java.io.OutputStream; |
| import java.io.OutputStreamWriter; |
| import java.io.Writer; |
| import java.lang.annotation.Annotation; |
| import java.lang.reflect.Type; |
| import java.nio.charset.StandardCharsets; |
| |
| @Provider |
| @Produces(MediaType.APPLICATION_JSON) |
| @InterfaceAudience.Private |
| public class JSONProvider implements MessageBodyWriter<JSONStreamAware> { |
| private static final String ENTER = System.getProperty("line.separator"); |
| |
| @Override |
| public boolean isWriteable(Class<?> aClass, Type type, Annotation[] annotations, MediaType mediaType) { |
| return JSONStreamAware.class.isAssignableFrom(aClass); |
| } |
| |
| @Override |
| public long getSize(JSONStreamAware jsonStreamAware, Class<?> aClass, Type type, Annotation[] annotations, |
| MediaType mediaType) { |
| return -1; |
| } |
| |
| @Override |
| public void writeTo(JSONStreamAware jsonStreamAware, Class<?> aClass, Type type, Annotation[] annotations, |
| MediaType mediaType, MultivaluedMap<String, Object> stringObjectMultivaluedMap, |
| OutputStream outputStream) throws IOException, WebApplicationException { |
| Writer writer = |
| new OutputStreamWriter(outputStream, StandardCharsets.UTF_8); |
| jsonStreamAware.writeJSONString(writer); |
| writer.write(ENTER); |
| writer.flush(); |
| } |
| |
| } |