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.array;
17
18 import java.lang.reflect.Array;
19 import java.util.List;
20 import java.util.Iterator;
21
22 import org.apache.commons.convert1.ConversionException;
23 import org.apache.commons.convert1.Converter;
24
25 import org.apache.commons.convert1.ConvertRegistry;
26
27
28 /**
29 * <p>Standard {@link Converter} implementation that converts an incoming
30 * comma delimited String into a known Java class via another Converter.
31 *
32 * @author Henri Yandell
33 * @version $Id: ArrayConverter.java 155441 2005-02-26 13:19:22Z dirkv $
34 * @since 0.1
35 */
36 public class ArrayConverter implements Converter {
37
38 private ConvertRegistry registry;
39 private Converter converter;
40
41 /**
42 * Handles multiple types of sub-type by reusing a
43 * particular registry for the sub-elements.
44 */
45 public ArrayConverter(ConvertRegistry registry) {
46 this.registry = registry;
47 }
48
49 /**
50 * Handles only one type of element converter.
51 */
52 public ArrayConverter(Converter converter) {
53 this.converter = converter;
54 }
55
56 /**
57 * Convert the specified input object into an output object of the
58 * specified type.
59 *
60 * @param type Data type to which this value should be converted
61 * @param value The input value to be converted
62 *
63 * @exception ConversionException if conversion cannot be performed
64 * successfully
65 */
66 public Object convert(Class toClass, Object value) {
67
68 if (value == null) {
69 return null; // ignore defaults for the moment
70 }
71
72 // parse the comma delimitation.
73 //H? can we abstract this somehow?
74 // An ElementProvider?
75 List elements = StringArrayParser.parseElements(value.toString());
76
77 // assume that toClass is an array??
78 if( toClass.isArray() ) {
79 toClass = toClass.getComponentType();
80 }
81 Object array = Array.newInstance( toClass, elements.size() );
82
83 if(registry != null) {
84 converter = this.registry.lookup( String.class, toClass );
85 }
86
87 Iterator itr = elements.iterator();
88 int idx = 0;
89 while(itr.hasNext()) {
90 Array.set( array, idx, converter.convert( toClass, itr.next() ) );
91 idx++;
92 }
93
94 return array;
95 }
96
97 }