1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 */
19
20 package org.apache.commons.compress.compressors.pack200;
21
22 import java.io.FilterInputStream;
23 import java.io.IOException;
24 import java.io.InputStream;
25 import java.nio.file.Files;
26 import java.nio.file.Path;
27
28 /**
29 * StreamBridge that caches all data written to the output side in a temporary file.
30 *
31 * @since 1.3
32 */
33 final class TempFileCachingStreamBridge extends AbstractStreamBridge {
34
35 private final Path path;
36
37 TempFileCachingStreamBridge() throws IOException {
38 this.path = Files.createTempFile("commons-compress", "packtemp");
39 this.path.toFile().deleteOnExit();
40 this.out = Files.newOutputStream(path);
41 }
42
43 @SuppressWarnings("resource") // Caller closes
44 @Override
45 InputStream createInputStream() throws IOException {
46 out.close();
47 return new FilterInputStream(Files.newInputStream(path)) {
48 @Override
49 public void close() throws IOException {
50 try {
51 super.close();
52 } finally {
53 try {
54 Files.deleteIfExists(path);
55 } catch (final IOException ignore) {
56 // if this fails the only thing we can do is to rely on deleteOnExit
57 }
58 }
59 }
60 };
61 }
62 }