content: /*
   * 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.ambari.server.api;
  
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.InputStreamReader;
  import java.io.OutputStream;
  import java.io.OutputStreamWriter;
  import java.io.Reader;
  import java.io.Writer;
  import java.lang.annotation.Annotation;
  import java.lang.reflect.Type;
  
  import jakarta.ws.rs.Consumes;
  import jakarta.ws.rs.Produces;
  import jakarta.ws.rs.WebApplicationException;
  import jakarta.ws.rs.core.MediaType;
  import jakarta.ws.rs.core.MultivaluedMap;
  import jakarta.ws.rs.ext.MessageBodyReader;
  import jakarta.ws.rs.ext.MessageBodyWriter;
  import jakarta.ws.rs.ext.Provider;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.google.gson.Gson;
  import com.google.gson.GsonBuilder;
  
  @Provider
  @Consumes({MediaType.APPLICATION_JSON, "text/json"})
  @Produces({MediaType.APPLICATION_JSON, "text/json"})
  public class GsonJsonProvider implements MessageBodyReader<Object>,
      MessageBodyWriter<Object> {
  
    private static final Logger log = LoggerFactory.getLogger(GsonJsonProvider.class);
  
    static final Gson gson = new GsonBuilder()
  //      .setPrettyPrinting()
        .create();
  
    @Override
    public boolean isReadable(Class<?> type, Type genericType, 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, WebApplicationException {
      // ignore objects of type InputStream. Used in case of file uploads
      if(type.equals(InputStream.class))
        return entityStream;
  
      Reader reader = new InputStreamReader(entityStream);
      try {
        return gson.fromJson(reader, genericType);
      } finally {
        reader.close();
      }
    }
  
    @Override
    public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
      return true;
    }
  
    /**
     * Not known
     */
    @Override
    public long getSize(Object o, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
      return -1;
    }
  
    @Override
    public void writeTo(Object o, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType, MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream) throws IOException, WebApplicationException {
      Writer writer = new OutputStreamWriter(entityStream);
      try {
        gson.toJson(o, genericType, writer);
      } finally {
        writer.close();
      }
    }
  }
  