1 /*
2 Copyright (c) 2003, Vilmantas Baranauskas
3 All rights reserved.
4
5 Redistribution and use in source and binary forms, with or without
6 modification, are permitted provided that the following conditions are met:
7 * Redistributions of source code must retain the above copyright notice,
8 this list of conditions and the following disclaimer.
9 * Redistributions in binary form must reproduce the above copyright notice,
10 this list of conditions and the following disclaimer in the documentation
11 and/or other materials provided with the distribution.
12 * The names of its contributors may not be used to endorse or promote
13 products derived from this software without specific prior written
14 permission.
15
16 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
20 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 POSSIBILITY OF SUCH DAMAGE.
27 */
28 package org.sovt.impl;
29
30 import org.sovt.Transformer;
31
32 import java.util.ArrayList;
33 import java.util.Iterator;
34 import java.util.List;
35
36 /***
37 * This Transformer is used to collect other transformers into group.
38 *
39 * @author Vilmantas Baranauskas (vilmantas_baranauskas@yahoo.com)
40 */
41 public class GroupTransformer implements Transformer, Cloneable {
42
43 //-- constants -------------------------------------------------------------
44 //-- variables -------------------------------------------------------------
45 /***
46 * List of transformers in this group.
47 */
48 private List transformers = new ArrayList();
49
50 //-- constructors ----------------------------------------------------------
51 /***
52 * Creates instance of GroupTransformer.
53 */
54 public GroupTransformer() {
55 }
56
57 //-- methods ---------------------------------------------------------------
58 /***
59 * Adds transformer to the group.
60 *
61 * @param transformer Transformer to add.
62 */
63 public void addTransformer(Transformer transformer) {
64 transformers.add(transformer);
65 }
66
67 /***
68 * Performs a partly deep-cloning. New list of contained transformers is
69 * created but transformers themselfs are not cloned.
70 *
71 * @return clone of itself.
72 * @throws CloneNotSupportedException never.
73 */
74 public Object clone() throws CloneNotSupportedException {
75 GroupTransformer inspector = (GroupTransformer) super.clone();
76 inspector.transformers = new ArrayList(transformers);
77 return inspector;
78 }
79
80 /***
81 * Transforms object by invoking all transformers on it.
82 *
83 * @param object Object to transform.
84 * @return Transformed object as described in {@link org.sovt.Transformer}.
85 */
86 public Object transform(Object object) {
87 for (Iterator iterator = transformers.iterator(); iterator.hasNext();) {
88 Transformer transformer = (Transformer) iterator.next();
89 object = transformer.transform(object);
90 }
91 return object;
92 }
93
94 }