1 /*
2 * Copyright 2012-2013 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.properties.api.core.context.alias;
17
18 /**
19 * Signals that an alias points to two different physical resources.
20 */
21 public final class DuplicateAliasException extends AliasException
22 {
23 // ********************************* Fields *********************************
24
25 // --- constants ------------------------------------------------------------
26
27 /**
28 * The class version identifier.
29 * <p>
30 * The value of this constant is {@value}.
31 * </p>
32 */
33 private static final long serialVersionUID = 1L;
34
35 // --- members --------------------------------------------------------------
36
37 /**
38 * The physical value stored with the alias.
39 *
40 * @serial
41 */
42 private final String oldTarget;
43
44 /**
45 * The new physical value that differs from the previously stored.
46 *
47 * @serial
48 */
49 private final String newTarget;
50
51 // ****************************** Initializer *******************************
52
53 // ****************************** Constructors ******************************
54
55 /**
56 * Convenience constructor without a cause.
57 *
58 * @param alias the alias that signals a problem.
59 * @param oldTarget the target value stored with the alias.
60 * @param newTarget the new target value that differs from the previously
61 * stored.
62 */
63 public DuplicateAliasException(final String alias, final String oldTarget,
64 final String newTarget)
65 {
66 this(null, alias, oldTarget, newTarget);
67 }
68
69 /**
70 * Default constructor.
71 *
72 * @param cause the cause (which is saved for later retrieval by the
73 * {@link #getCause()} method). (A <tt>null</tt> value is permitted,
74 * and indicates that the cause is nonexistent or unknown.)
75 * @param alias the alias that signals a problem.
76 * @param oldTarget the target value stored with the alias.
77 * @param newTarget the new target value that differs from the previously
78 * stored.
79 */
80 public DuplicateAliasException(final Throwable cause, final String alias,
81 final String oldTarget, final String newTarget)
82 {
83 super("Duplicate alias '" + alias + "' with contradicting targets found: '"
84 + newTarget + "' replaced '" + oldTarget + "'.", cause, alias);
85 this.oldTarget = oldTarget;
86 this.newTarget = newTarget;
87 }
88
89 // ****************************** Inner Classes *****************************
90
91 // ********************************* Methods ********************************
92
93 // --- init -----------------------------------------------------------------
94
95 // --- get&set --------------------------------------------------------------
96
97 /**
98 * Returns the target value stored with the alias.
99 *
100 * @return the target value stored with the alias.
101 */
102 public String getOldTarget()
103 {
104 return oldTarget;
105 }
106
107 /**
108 * Returns the new target value that differs from the previously stored.
109 *
110 * @return the new target value that differs from the previously stored.
111 */
112 public String getNewTarget()
113 {
114 return newTarget;
115 }
116
117 // --- business -------------------------------------------------------------
118
119 // --- object basics --------------------------------------------------------
120
121 }