001/**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018
019package org.apache.hadoop.lib.wsrs;
020
021import org.json.simple.JSONObject;
022
023import javax.ws.rs.Produces;
024import javax.ws.rs.WebApplicationException;
025import javax.ws.rs.core.MediaType;
026import javax.ws.rs.core.MultivaluedMap;
027import javax.ws.rs.ext.MessageBodyWriter;
028import javax.ws.rs.ext.Provider;
029import java.io.IOException;
030import java.io.OutputStream;
031import java.io.OutputStreamWriter;
032import java.io.Writer;
033import java.lang.annotation.Annotation;
034import java.lang.reflect.Type;
035import java.util.Map;
036
037@Provider
038@Produces(MediaType.APPLICATION_JSON)
039public class JSONMapProvider implements MessageBodyWriter<Map> {
040  private static final String ENTER = System.getProperty("line.separator");
041
042  @Override
043  public boolean isWriteable(Class<?> aClass, Type type, Annotation[] annotations, MediaType mediaType) {
044    return Map.class.isAssignableFrom(aClass);
045  }
046
047  @Override
048  public long getSize(Map map, Class<?> aClass, Type type, Annotation[] annotations, MediaType mediaType) {
049    return -1;
050  }
051
052  @Override
053  public void writeTo(Map map, Class<?> aClass, Type type, Annotation[] annotations,
054                      MediaType mediaType, MultivaluedMap<String, Object> stringObjectMultivaluedMap,
055                      OutputStream outputStream) throws IOException, WebApplicationException {
056    Writer writer = new OutputStreamWriter(outputStream);
057    JSONObject.writeJSONString(map, writer);
058    writer.write(ENTER);
059    writer.flush();
060  }
061
062}