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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.io.input;
18  
19  import java.io.ByteArrayInputStream;
20  import java.io.IOException;
21  import java.io.InputStream;
22  import java.util.UUID;
23  
24  import junit.framework.TestCase;
25  
26  import org.apache.commons.io.TaggedIOException;
27  
28  /**
29   * JUnit Test Case for {@link TaggedInputStream}.
30   */
31  public class TaggedInputStreamTest extends TestCase {
32  
33      public void testEmptyStream() {
34          try {
35              final InputStream stream = new TaggedInputStream(new ClosedInputStream());
36              assertEquals(0, stream.available());
37              assertEquals(-1, stream.read());
38              assertEquals(-1, stream.read(new byte[1]));
39              assertEquals(-1, stream.read(new byte[1], 0, 1));
40              stream.close();
41          } catch (final IOException e) {
42              fail("Unexpected exception thrown");
43          }
44      }
45  
46      public void testNormalStream() {
47          try {
48              final InputStream stream = new TaggedInputStream(
49                      new ByteArrayInputStream(new byte[] { 'a', 'b', 'c' }));
50              assertEquals(3, stream.available());
51              assertEquals('a', stream.read());
52              final byte[] buffer = new byte[1];
53              assertEquals(1, stream.read(buffer));
54              assertEquals('b', buffer[0]);
55              assertEquals(1, stream.read(buffer, 0, 1));
56              assertEquals('c', buffer[0]);
57              assertEquals(-1, stream.read());
58              stream.close();
59          } catch (final IOException e) {
60              fail("Unexpected exception thrown");
61          }
62      }
63  
64      public void testBrokenStream() {
65          final IOException exception = new IOException("test exception");
66          final TaggedInputStream stream =
67              new TaggedInputStream(new BrokenInputStream(exception));
68  
69          // Test the available() method
70          try {
71              stream.available();
72              fail("Expected exception not thrown.");
73          } catch (final IOException e) {
74              assertTrue(stream.isCauseOf(e));
75              try {
76                  stream.throwIfCauseOf(e);
77                  fail("Expected exception not thrown.");
78              } catch (final IOException e2) {
79                  assertEquals(exception, e2);
80              }
81          }
82  
83          // Test the read() method
84          try {
85              stream.read();
86              fail("Expected exception not thrown.");
87          } catch (final IOException e) {
88              assertTrue(stream.isCauseOf(e));
89              try {
90                  stream.throwIfCauseOf(e);
91                  fail("Expected exception not thrown.");
92              } catch (final IOException e2) {
93                  assertEquals(exception, e2);
94              }
95          }
96  
97          // Test the close() method
98          try {
99              stream.close();
100             fail("Expected exception not thrown.");
101         } catch (final IOException e) {
102             assertTrue(stream.isCauseOf(e));
103             try {
104                 stream.throwIfCauseOf(e);
105                 fail("Expected exception not thrown.");
106             } catch (final IOException e2) {
107                 assertEquals(exception, e2);
108             }
109         }
110     }
111 
112     public void testOtherException() throws Exception {
113         final IOException exception = new IOException("test exception");
114         final InputStream closed = new ClosedInputStream();
115         final TaggedInputStream stream = new TaggedInputStream(closed);
116 
117         assertFalse(stream.isCauseOf(exception));
118         assertFalse(stream.isCauseOf(
119                 new TaggedIOException(exception, UUID.randomUUID())));
120 
121         try {
122             stream.throwIfCauseOf(exception);
123         } catch (final IOException e) {
124             fail("Unexpected exception thrown");
125         }
126 
127         try {
128             stream.throwIfCauseOf(
129                     new TaggedIOException(exception, UUID.randomUUID()));
130         } catch (final IOException e) {
131             fail("Unexpected exception thrown");
132         }
133         stream.close();
134     }
135 
136 }