winery/org.eclipse.winery.highlevelrestapi/src/main/java/org/eclipse/winery/highlevelrestapi/LowLevelRestApi.java

   1 /*******************************************************************************
   2  * Copyright (c) 2013 University of Stuttgart.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Eclipse Public License v1.0
   5  * and the Apache License 2.0 which both accompany this distribution,
   6  * and are available at http://www.eclipse.org/legal/epl-v10.html
   7  * and http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Contributors:
  10  *     Uwe Breitenbücher - initial API and implementation
  11  *     Kálmán Képes - improvements
  12  *******************************************************************************/
  13 package org.eclipse.winery.highlevelrestapi;
  14
  15 import org.apache.commons.httpclient.HttpClient;
  16 import org.apache.commons.httpclient.HttpMethod;
  17
  18 /**
  19  * This static-class eases HTTP-method execution by self-managed fault-handling
  20  * and automated Response-information processing
  21  */
  22 public class LowLevelRestApi {
  23
  24         // Local HttpClient used for every communication (Singleton implementation)
  25         private static HttpClient httpClient = new HttpClient();
  26
  27
  28         /**
  29          * Executes a passed HttpMethod (Method type is either PUT, POST, GET or
  30          * DELETE) and returns a HttpResponseMessage
  31          *
  32          * @param method Method to execute
  33          * @return HttpResponseMessage which contains all information about the
  34          *         execution
  35          */
  36         public static HttpResponseMessage executeHttpMethod(HttpMethod method) {
  37
  38                 HttpResponseMessage responseMessage = null;
  39
  40                 try {
  41                         System.out.println("Method invocation on URI: \n");
  42                         System.out.println(method.getURI().toString());
  43                         // Execute Request
  44                         LowLevelRestApi.httpClient.executeMethod(method);
  45                         responseMessage = LowLevelRestApi.extractResponseInformation(method);
  46
  47                 } catch (Exception e) {
  48                         e.printStackTrace();
  49                 } finally {
  50
  51                         // Release Connection anyway
  52                         method.releaseConnection();
  53                 }
  54
  55                 // Extract response information and return
  56                 return responseMessage;
  57         }
  58
  59         /**
  60          * Extracts the response information from an executed HttpMethod
  61          *
  62          * @param method Executed Method
  63          * @return Packaged response information
  64          */
  65         private static HttpResponseMessage extractResponseInformation(HttpMethod method) {
  66                 // Create and return HttpResponseMethod
  67                 HttpResponseMessage responseMessage = new HttpResponseMessage();
  68                 responseMessage.setStatusCode(method.getStatusCode());
  69                 try {
  70                         responseMessage.setResponseBody(method.getResponseBodyAsString());
  71                 } catch (Exception e) {
  72                         e.printStackTrace();
  73                 }
  74                 return responseMessage;
  75
  76         }
  77
  78 }