Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
ClassConverter |
|
| 5.0;5 |
1 | /* | |
2 | * Copyright 2003-2004 The Apache Software Foundation | |
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 org.apache.commons.convert1.string; | |
17 | ||
18 | ||
19 | import org.apache.commons.convert1.ConversionException; | |
20 | import org.apache.commons.convert1.Converter; | |
21 | ||
22 | ||
23 | /** | |
24 | * <p>Standard {@link Converter} implementation that converts an incoming | |
25 | * String into a <code>java.lang.Class</code> object, optionally using a | |
26 | * default value or throwing a {@link ConversionException} if a conversion | |
27 | * error occurs. The class will be loaded from the thread context class | |
28 | * loader (if it exists); otherwise the class loader that loaded this class | |
29 | * will be used.</p> | |
30 | * | |
31 | * @author Tomas Viberg | |
32 | * @version $Id: ClassConverter.java 155441 2005-02-26 13:19:22Z dirkv $ | |
33 | * @since 0.1 | |
34 | */ | |
35 | ||
36 | public final class ClassConverter implements Converter { | |
37 | ||
38 | ||
39 | // ----------------------------------------------------------- Constructors | |
40 | ||
41 | ||
42 | /** | |
43 | * Create a {@link Converter} that will throw a {@link ConversionException} | |
44 | * if a conversion error occurs. | |
45 | */ | |
46 | 0 | public ClassConverter() { |
47 | ||
48 | 0 | this.defaultValue = null; |
49 | 0 | this.useDefault = false; |
50 | ||
51 | 0 | } |
52 | ||
53 | ||
54 | /** | |
55 | * Create a {@link Converter} that will return the specified default value | |
56 | * if a conversion error occurs. | |
57 | * | |
58 | * @param defaultValue The default value to be returned | |
59 | */ | |
60 | 0 | public ClassConverter(Object defaultValue) { |
61 | ||
62 | 0 | this.defaultValue = defaultValue; |
63 | 0 | this.useDefault = true; |
64 | ||
65 | 0 | } |
66 | ||
67 | ||
68 | // ----------------------------------------------------- Instance Variables | |
69 | ||
70 | ||
71 | /** | |
72 | * The default value specified to our Constructor, if any. | |
73 | */ | |
74 | 0 | private Object defaultValue = null; |
75 | ||
76 | ||
77 | /** | |
78 | * Should we return the default value on conversion errors? | |
79 | */ | |
80 | 0 | private boolean useDefault = true; |
81 | ||
82 | ||
83 | // --------------------------------------------------------- Public Methods | |
84 | ||
85 | ||
86 | /** | |
87 | * Convert the specified input object into an output object of the | |
88 | * specified type. | |
89 | * | |
90 | * @param type Data type to which this value should be converted | |
91 | * @param value The input value to be converted | |
92 | * | |
93 | * @exception ConversionException if conversion cannot be performed | |
94 | * successfully | |
95 | */ | |
96 | public Object convert(Class type, Object value) { | |
97 | ||
98 | 0 | if (value == null) { |
99 | 0 | if (useDefault) { |
100 | 0 | return (defaultValue); |
101 | } else { | |
102 | 0 | throw new ConversionException("No value specified"); |
103 | } | |
104 | } | |
105 | ||
106 | 0 | if (value instanceof Class) { |
107 | 0 | return (value); |
108 | } | |
109 | ||
110 | try { | |
111 | 0 | ClassLoader classLoader = |
112 | Thread.currentThread().getContextClassLoader(); | |
113 | 0 | if (classLoader == null) { |
114 | 0 | classLoader = ClassConverter.class.getClassLoader(); |
115 | } | |
116 | 0 | return (classLoader.loadClass(value.toString())); |
117 | 0 | } catch (Exception e) { |
118 | 0 | if (useDefault) { |
119 | 0 | return (defaultValue); |
120 | } else { | |
121 | 0 | throw new ConversionException(e); |
122 | } | |
123 | } | |
124 | ||
125 | } | |
126 | ||
127 | ||
128 | } |