1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.commons.vfs2;
18
19 import java.io.IOException;
20
21 import org.apache.commons.vfs2.util.RandomAccessMode;
22 import org.junit.Assert;
23 import org.junit.Test;
24
25 /**
26 * Random set length test cases for file providers.
27 *
28 */
29 public class ProviderRandomSetLengthTests extends AbstractProviderTestCase {
30 private static final String TEST_DATA = "This is a test file.";
31
32 /**
33 * Sets up a scratch folder for the test to use.
34 */
35 protected FileObject createScratchFolder() throws Exception {
36 final FileObject scratchFolder = this.getWriteFolder();
37
38 // Make sure the test folder is empty
39 scratchFolder.delete(Selectors.EXCLUDE_SELF);
40 scratchFolder.createFolder();
41
42 return scratchFolder;
43 }
44
45 /**
46 * Returns the capabilities required by the tests of this test case.
47 */
48 @Override
49 protected Capability[] getRequiredCapabilities() {
50 return new Capability[] { Capability.GET_TYPE, Capability.RANDOM_ACCESS_READ, Capability.RANDOM_ACCESS_WRITE,
51 Capability.RANDOM_ACCESS_SET_LENGTH };
52 }
53
54 /**
55 * Writes a file
56 */
57 @Test
58 public void testRandomSetLength() throws Exception {
59 try (FileObject file = this.createScratchFolder().resolveFile("random_write.txt")) {
60 file.createFile();
61 final String fileString = file.toString();
62 final RandomAccessContent ra = file.getContent().getRandomAccessContent(RandomAccessMode.READWRITE);
63
64 // Write long string
65 ra.writeBytes(TEST_DATA);
66 Assert.assertEquals(fileString, TEST_DATA.length(), ra.length());
67
68 // Shrink to length 1
69 ra.setLength(1);
70 Assert.assertEquals(fileString, 1, ra.length());
71 // now read 1
72 ra.seek(0);
73 Assert.assertEquals(fileString, TEST_DATA.charAt(0), ra.readByte());
74
75 try {
76 ra.readByte();
77 Assert.fail("Expected " + Exception.class.getName());
78 } catch (final IOException e) {
79 // Expected
80 }
81
82 // Grow to length 2
83 ra.setLength(2);
84 Assert.assertEquals(fileString, 2, ra.length());
85 // We have an undefined extra byte
86 ra.seek(1);
87 ra.readByte();
88
89 }
90 }
91 }