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18 package org.apache.commons.beanutils.converters;
19
20
21 import java.util.List;
22 import org.apache.commons.beanutils.ConversionException;
23 import org.apache.commons.beanutils.Converter;
24
25
26 /**
27 * <p>Standard {@link Converter} implementation that converts an incoming
28 * String into an array of String. On a conversion failure, returns
29 * a specified default value or throws a {@link ConversionException} depending
30 * on how this instance is constructed.</p>
31 *
32 * @author Craig R. McClanahan
33 * @version $Revision: 1.7 $ $Date: 2004/02/28 13:18:34 $
34 * @since 1.4
35 */
36
37 public final class StringArrayConverter extends AbstractArrayConverter {
38
39
40
41
42
43 /**
44 * Create a {@link Converter} that will throw a {@link ConversionException}
45 * if a conversion error occurs.
46 */
47 public StringArrayConverter() {
48
49 this.defaultValue = null;
50 this.useDefault = false;
51
52 }
53
54
55 /**
56 * Create a {@link Converter} that will return the specified default value
57 * if a conversion error occurs.
58 *
59 * @param defaultValue The default value to be returned
60 */
61 public StringArrayConverter(Object defaultValue) {
62
63 this.defaultValue = defaultValue;
64 this.useDefault = true;
65
66 }
67
68
69
70
71
72 /**
73 * <p>Model object for type comparisons.</p>
74 */
75 private static String model[] = new String[0];
76
77 /**
78 * <p> Model object for int arrays.</p>
79 */
80 private static int ints[] = new int[0];
81
82
83
84
85
86
87 /**
88 * Convert the specified input object into an output object of the
89 * specified type.
90 *
91 * @param type Data type to which this value should be converted
92 * @param value The input value to be converted
93 *
94 * @exception ConversionException if conversion cannot be performed
95 * successfully
96 */
97 public Object convert(Class type, Object value) {
98
99
100 if (value == null) {
101 if (useDefault) {
102 return (defaultValue);
103 } else {
104 throw new ConversionException("No value specified");
105 }
106 }
107
108
109 if (model.getClass() == value.getClass()) {
110 return (value);
111 }
112
113
114 if (ints.getClass() == value.getClass())
115 {
116 int[] values = (int[]) value;
117 String[] results = new String[values.length];
118 for (int i = 0; i < values.length; i++)
119 {
120 results[i] = Integer.toString(values[i]);
121 }
122
123 return (results);
124 }
125
126
127
128 try {
129 List list = parseElements(value.toString());
130 String results[] = new String[list.size()];
131 for (int i = 0; i < results.length; i++) {
132 results[i] = (String) list.get(i);
133 }
134 return (results);
135 } catch (Exception e) {
136 if (useDefault) {
137 return (defaultValue);
138 } else {
139 throw new ConversionException(value.toString(), e);
140 }
141 }
142
143 }
144
145
146 }