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 import org.apache.http.util.Args;
37
38 /**
39 * Entity that delegates the process of content generation
40 * to a {@link ContentProducer}.
41 *
42 * @since 4.0
43 */
44 public class EntityTemplate extends AbstractHttpEntity {
45
46 private final ContentProducer contentproducer;
47
48 public EntityTemplate(final ContentProducer contentproducer) {
49 super();
50 this.contentproducer = Args.notNull(contentproducer, "Content producer");
51 }
52
53 @Override
54 public long getContentLength() {
55 return -1;
56 }
57
58 @Override
59 public InputStream getContent() throws IOException {
60 final ByteArrayOutputStream buf = new ByteArrayOutputStream();
61 writeTo(buf);
62 return new ByteArrayInputStream(buf.toByteArray());
63 }
64
65 @Override
66 public boolean isRepeatable() {
67 return true;
68 }
69
70 @Override
71 public void writeTo(final OutputStream outStream) throws IOException {
72 Args.notNull(outStream, "Output stream");
73 this.contentproducer.writeTo(outStream);
74 }
75
76 @Override
77 public boolean isStreaming() {
78 return false;
79 }
80
81 }