/**
 * 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.yarn.server.resourcemanager.webapp;

import com.google.inject.Singleton;
import com.sun.jersey.api.json.JSONConfiguration;
import com.sun.jersey.api.json.JSONJAXBContext;

import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;

import javax.ws.rs.ext.ContextResolver;
import javax.ws.rs.ext.Provider;
import javax.xml.bind.JAXBContext;

import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.UserInfo;
import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.AppInfo;
import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.AppAttemptInfo;
import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.AppAttemptsInfo;
import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.ApplicationStatisticsInfo;
import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.AppsInfo;
import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.CapacitySchedulerInfo;
import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.CapacitySchedulerQueueInfo;
import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.CapacitySchedulerQueueInfoList;
import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.ClusterInfo;
import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.ClusterMetricsInfo;
import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.StatisticsItemInfo;
import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.FifoSchedulerInfo;
import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.NodeInfo;
import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.NodesInfo;
import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.ResourceInfo;
import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.SchedulerInfo;
import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.SchedulerTypeInfo;
import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.UserMetricsInfo;
import org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.UsersInfo;
import org.apache.hadoop.yarn.webapp.RemoteExceptionData;

@Singleton
@Provider
public class JAXBContextResolver implements ContextResolver<JAXBContext> {

  private JAXBContext context;
  private final Set<Class> types;

  // you have to specify all the dao classes here
  private final Class[] cTypes = { AppInfo.class, AppAttemptInfo.class,
      AppAttemptsInfo.class, ClusterInfo.class,
      CapacitySchedulerQueueInfo.class, FifoSchedulerInfo.class,
      SchedulerTypeInfo.class, NodeInfo.class, UserMetricsInfo.class,
      CapacitySchedulerInfo.class, ClusterMetricsInfo.class,
      SchedulerInfo.class, AppsInfo.class, NodesInfo.class,
      RemoteExceptionData.class, CapacitySchedulerQueueInfoList.class,
      ResourceInfo.class, UsersInfo.class, UserInfo.class,
      ApplicationStatisticsInfo.class, StatisticsItemInfo.class};

  public JAXBContextResolver() throws Exception {
    this.types = new HashSet<Class>(Arrays.asList(cTypes));
    this.context = new JSONJAXBContext(JSONConfiguration.natural()
        .rootUnwrapping(false).build(), cTypes);
  }

  @Override
  public JAXBContext getContext(Class<?> objectType) {
    return (types.contains(objectType)) ? context : null;
  }
}