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1   /*
2    * ====================================================================
3    * Licensed to the Apache Software Foundation (ASF) under one
4    * or more contributor license agreements.  See the NOTICE file
5    * distributed with this work for additional information
6    * regarding copyright ownership.  The ASF licenses this file
7    * to you under the Apache License, Version 2.0 (the
8    * "License"); you may not use this file except in compliance
9    * with the License.  You may obtain a copy of the License at
10   *
11   *   http://www.apache.org/licenses/LICENSE-2.0
12   *
13   * Unless required by applicable law or agreed to in writing,
14   * software distributed under the License is distributed on an
15   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16   * KIND, either express or implied.  See the License for the
17   * specific language governing permissions and limitations
18   * under the License.
19   * ====================================================================
20   *
21   * This software consists of voluntary contributions made by many
22   * individuals on behalf of the Apache Software Foundation.  For more
23   * information on the Apache Software Foundation, please see
24   * <http://www.apache.org/>.
25   *
26   */
27  package org.apache.http.impl.execchain;
28  
29  import java.io.OutputStream;
30  import java.lang.reflect.InvocationHandler;
31  import java.lang.reflect.InvocationTargetException;
32  import java.lang.reflect.Method;
33  
34  import org.apache.http.HttpEntity;
35  import org.apache.http.annotation.NotThreadSafe;
36  
37  /**
38   * A wrapper class for {@link HttpEntity} enclosed in a request message.
39   *
40   * @since 4.3
41   */
42  @NotThreadSafe
43  class RequestEntityExecHandler implements InvocationHandler  {
44  
45      private static final Method WRITE_TO_METHOD;
46  
47      static {
48          try {
49              WRITE_TO_METHOD = HttpEntity.class.getMethod("writeTo", OutputStream.class);
50          } catch (final NoSuchMethodException ex) {
51              throw new Error(ex);
52          }
53      }
54  
55      private final HttpEntity original;
56      private boolean consumed = false;
57  
58      RequestEntityExecHandler(final HttpEntity original) {
59          super();
60          this.original = original;
61      }
62  
63      public HttpEntity getOriginal() {
64          return original;
65      }
66  
67      public boolean isConsumed() {
68          return consumed;
69      }
70  
71      public Object invoke(
72              final Object proxy, final Method method, final Object[] args) throws Throwable {
73          try {
74              if (method.equals(WRITE_TO_METHOD)) {
75                  this.consumed = true;
76              }
77              return method.invoke(original, args);
78          } catch (final InvocationTargetException ex) {
79              final Throwable cause = ex.getCause();
80              if (cause != null) {
81                  throw cause;
82              } else {
83                  throw ex;
84              }
85          }
86      }
87  
88  }