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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  
28  package org.apache.http.entity;
29  
30  import java.io.ByteArrayInputStream;
31  import java.io.ByteArrayOutputStream;
32  import java.io.IOException;
33  import java.io.InputStream;
34  import java.io.OutputStream;
35  
36  /**
37   * Entity that delegates the process of content generation
38   * to a {@link ContentProducer}.
39   *
40   * @since 4.0
41   */
42  public class EntityTemplate extends AbstractHttpEntity {
43  
44      private final ContentProducer contentproducer;
45  
46      public EntityTemplate(final ContentProducer contentproducer) {
47          super();
48          if (contentproducer == null) {
49              throw new IllegalArgumentException("Content producer may not be null");
50          }
51          this.contentproducer = contentproducer;
52      }
53  
54      public long getContentLength() {
55          return -1;
56      }
57  
58      public InputStream getContent() throws IOException {
59          ByteArrayOutputStream buf = new ByteArrayOutputStream();
60          writeTo(buf);
61          return new ByteArrayInputStream(buf.toByteArray());
62      }
63  
64      public boolean isRepeatable() {
65          return true;
66      }
67  
68      public void writeTo(final OutputStream outstream) throws IOException {
69          if (outstream == null) {
70              throw new IllegalArgumentException("Output stream may not be null");
71          }
72          this.contentproducer.writeTo(outstream);
73      }
74  
75      public boolean isStreaming() {
76          return false;
77      }
78  
79  }