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 */
018package org.apache.oozie.servlet;
019
020import org.apache.oozie.client.OozieClient;
021import org.apache.oozie.servlet.JsonRestServlet;
022import org.json.simple.JSONArray;
023
024import javax.servlet.ServletException;
025import javax.servlet.http.HttpServletRequest;
026import javax.servlet.http.HttpServletResponse;
027import java.io.IOException;
028import java.util.Arrays;
029import java.util.Collections;
030
031public 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}