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18 package org.apache.commons.beanutils.converters;
19
20
21 import org.apache.commons.beanutils.ConversionException;
22 import org.apache.commons.beanutils.Converter;
23
24
25 /**
26 * <p>Standard {@link Converter} implementation that converts an incoming
27 * String into a <code>java.lang.Byte</code> object, optionally using a
28 * default value or throwing a {@link ConversionException} if a conversion
29 * error occurs.</p>
30 *
31 * @author Craig R. McClanahan
32 * @version $Revision: 1.9 $ $Date: 2004/02/28 13:18:34 $
33 * @since 1.3
34 */
35
36 public final class ByteConverter implements Converter {
37
38
39
40
41
42 /**
43 * Create a {@link Converter} that will throw a {@link ConversionException}
44 * if a conversion error occurs.
45 */
46 public ByteConverter() {
47
48 this.defaultValue = null;
49 this.useDefault = false;
50
51 }
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 public ByteConverter(Object defaultValue) {
61
62 this.defaultValue = defaultValue;
63 this.useDefault = true;
64
65 }
66
67
68
69
70
71 /**
72 * The default value specified to our Constructor, if any.
73 */
74 private Object defaultValue = null;
75
76
77 /**
78 * Should we return the default value on conversion errors?
79 */
80 private boolean useDefault = true;
81
82
83
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 if (value == null) {
99 if (useDefault) {
100 return (defaultValue);
101 } else {
102 throw new ConversionException("No value specified");
103 }
104 }
105
106
107
108 if (value instanceof Byte) {
109 return (value);
110 } else if (value instanceof Number) {
111 return new Byte(((Number)value).byteValue());
112 }
113
114 try {
115 return (new Byte(value.toString()));
116 } catch (Exception e) {
117 if (useDefault) {
118 return (defaultValue);
119 } else {
120 throw new ConversionException(e);
121 }
122 }
123
124 }
125
126
127 }