1 /*
2 * Copyright 2008-2012 smartics, Kronseder & Reiner GmbH
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16 package de.smartics.util.test.matcher.io;
17
18 import org.hamcrest.Description;
19 import org.hamcrest.TypeSafeDiagnosingMatcher;
20
21 /**
22 * A matcher to check that the contents of two stream contain the identical
23 * information.
24 *
25 * @param <T> the type of the matcher's expected values.
26 */
27 public abstract class AbstractEqualContentAs<T> extends
28 TypeSafeDiagnosingMatcher<T>
29 {
30 // ********************************* Fields *********************************
31
32 // --- constants ------------------------------------------------------------
33
34 // --- members --------------------------------------------------------------
35
36 /**
37 * The content read from the other stream.
38 */
39 private final String expectedContent;
40
41 /**
42 * The actual content found. If <code>null</code> no value has yet been read.
43 * <p>
44 * Since the reader cannot be read twice, the content is stored after the
45 * first read.
46 * </p>
47 */
48 private String actualContent;
49
50 // ****************************** Initializer *******************************
51
52 // ****************************** Constructors ******************************
53
54 /**
55 * Convenience constructor if the content is served as a String.
56 *
57 * @param expectedContent the expected content.
58 */
59 public AbstractEqualContentAs(final String expectedContent)
60 {
61 this.expectedContent = expectedContent;
62 }
63
64 // ****************************** Inner Classes *****************************
65
66 // ********************************* Methods ********************************
67
68 // --- init -----------------------------------------------------------------
69
70 // --- get&set --------------------------------------------------------------
71
72 /**
73 * Returns the actual content found. If <code>null</code> no value has yet
74 * been read.
75 * <p>
76 * Since the reader cannot be read twice, the content is stored after the
77 * first read.
78 * </p>
79 *
80 * @return the actual content found. May be <code>null</code>.
81 */
82 public final String getActualContent()
83 {
84 return actualContent;
85 }
86
87 // --- business -------------------------------------------------------------
88
89 /**
90 * {@inheritDoc}
91 *
92 * @see org.hamcrest.SelfDescribing#describeTo(org.hamcrest.Description)
93 */
94 public final void describeTo(final Description description)
95 {
96 description.appendValue(expectedContent);
97 }
98
99 /**
100 * {@inheritDoc}
101 *
102 * @see org.hamcrest.TypeSafeDiagnosingMatcher#matchesSafely(java.lang.Object,
103 * org.hamcrest.Description)
104 */
105 @Override
106 protected final boolean matchesSafely(final T actual,
107 final Description mismatchDescription)
108 {
109 try
110 {
111 if (actualContent == null)
112 {
113 actualContent = toString(actual);
114 }
115
116 final boolean result = expectedContent.equals(actualContent);
117 if (!result)
118 {
119 mismatchDescription.appendValue(actualContent);
120 }
121 return result;
122 }
123 catch (final IllegalArgumentException e)
124 {
125 return false;
126 }
127 }
128
129 /**
130 * Turns the instance to its string representation.
131 *
132 * @param actual the instance whose string representation is requested.
133 * @return the string representation of <code>actual</code>.
134 * @throws IllegalArgumentException if no string representation can be
135 * created.
136 */
137 protected abstract String toString(T actual) throws IllegalArgumentException;
138
139 // --- object basics --------------------------------------------------------
140
141 }