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.client.cache;
28
29 import java.io.File;
30 import java.io.FileInputStream;
31 import java.io.IOException;
32 import java.io.InputStream;
33
34 import org.apache.http.annotation.Contract;
35 import org.apache.http.annotation.ThreadingBehavior;
36 import org.apache.http.client.cache.Resource;
37
38 /**
39 * Cache resource backed by a file.
40 *
41 * @since 4.1
42 */
43 @Contract(threading = ThreadingBehavior.SAFE)
44 public class FileResource implements Resource {
45
46 private static final long serialVersionUID = 4132244415919043397L;
47
48 private final File file;
49
50 private volatile boolean disposed;
51
52 public FileResource(final File file) {
53 super();
54 this.file = file;
55 this.disposed = false;
56 }
57
58 synchronized File getFile() {
59 return this.file;
60 }
61
62 @Override
63 public synchronized InputStream getInputStream() throws IOException {
64 return new FileInputStream(this.file);
65 }
66
67 @Override
68 public synchronized long length() {
69 return this.file.length();
70 }
71
72 @Override
73 public synchronized void dispose() {
74 if (this.disposed) {
75 return;
76 }
77 this.disposed = true;
78 this.file.delete();
79 }
80
81 }