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    package org.apache.oozie.servlet;
019    
020    import org.apache.oozie.client.OozieClient;
021    import org.apache.oozie.servlet.JsonRestServlet;
022    import org.json.simple.JSONArray;
023    
024    import javax.servlet.ServletException;
025    import javax.servlet.http.HttpServletRequest;
026    import javax.servlet.http.HttpServletResponse;
027    import java.io.IOException;
028    import java.util.Arrays;
029    import java.util.Collections;
030    
031    public class VersionServlet extends JsonRestServlet {
032        private static final String INSTRUMENTATION_NAME = "version";
033    
034        private static final ResourceInfo RESOURCE_INFO =
035                new ResourceInfo("", Arrays.asList("GET"), Collections.EMPTY_LIST);
036    
037        // private static JSONArray versions = new JSONArray();
038    
039        public VersionServlet() {
040            super(INSTRUMENTATION_NAME, RESOURCE_INFO);
041            // versions.add(OozieClient.WS_PROTOCOL_VERSION_0);
042            // versions.add(OozieClient.WS_PROTOCOL_VERSION);
043        }
044    
045        protected void doGet(HttpServletRequest request, HttpServletResponse response)
046                throws ServletException, IOException {
047            JSONArray versions = new JSONArray();
048            versions.add(OozieClient.WS_PROTOCOL_VERSION_0);
049            versions.add(OozieClient.WS_PROTOCOL_VERSION_1);
050            versions.add(OozieClient.WS_PROTOCOL_VERSION);
051            sendJsonResponse(response, HttpServletResponse.SC_OK, versions);
052        }
053    }