1 /*
2 * The Apache Software License, Version 1.1
3 *
4 * Copyright (c) 2002 The Apache Software Foundation. All rights
5 * reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 *
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
17 * distribution.
18 *
19 * 3. The end-user documentation included with the redistribution,
20 * if any, must include the following acknowledgment:
21 * "This product includes software developed by the
22 * Apache Software Foundation (http://www.apache.org/)."
23 * Alternately, this acknowledgment may appear in the software itself,
24 * if and wherever such third-party acknowledgments normally appear.
25 *
26 * 4. The names "Apache" and "Apache Software Foundation" must
27 * not be used to endorse or promote products derived from this
28 * software without prior written permission. For written
29 * permission, please contact apache@apache.org.
30 *
31 * 5. Products derived from this software may not be called "Apache",
32 * nor may "Apache" appear in their name, without prior written
33 * permission of the Apache Software Foundation.
34 *
35 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
36 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
37 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
38 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
39 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
40 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
41 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
42 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
43 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
44 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
45 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
46 * SUCH DAMAGE.
47 * ====================================================================
48 *
49 * This software consists of voluntary contributions made by many
50 * individuals on behalf of the Apache Software Foundation. For more
51 * information on the Apache Software Foundation, please see
52 * <http://www.apache.org/>;.
53 */
54 package net.sf.cglib.core;
55
56 import java.util.*;
57 import java.lang.reflect.Array;
58
59 /***
60 * @author Chris Nokleberg
61 * @version $Id: CollectionUtils.java,v 1.4 2003/10/03 23:09:29 herbyderby Exp $
62 */
63 public class CollectionUtils {
64 private CollectionUtils() { }
65
66 public static Map bucket(Collection c, Transformer t) {
67 Map buckets = new HashMap();
68 for (Iterator it = c.iterator(); it.hasNext();) {
69 Object value = (Object)it.next();
70 Object key = t.transform(value);
71 List bucket = (List)buckets.get(key);
72 if (bucket == null) {
73 buckets.put(key, bucket = new LinkedList());
74 }
75 bucket.add(value);
76 }
77 return buckets;
78 }
79
80 public static void reverse(Map source, Map target) {
81 for (Iterator it = source.keySet().iterator(); it.hasNext();) {
82 Object key = it.next();
83 target.put(source.get(key), key);
84 }
85 }
86
87 public static Object[] filter(Object[] a, Predicate p) {
88 List c = new ArrayList(Arrays.asList(a));
89 filter(c, p);
90 return c.toArray((Object[])Array.newInstance(a.getClass().getComponentType(), c.size()));
91 }
92
93 public static Collection filter(Collection c, Predicate p) {
94 Iterator it = c.iterator();
95 while (it.hasNext()) {
96 if (!p.evaluate(it.next())) {
97 it.remove();
98 }
99 }
100 return c;
101 }
102
103 public static List transform(List c, Transformer t) {
104 List result = new ArrayList(c.size());
105 for (Iterator it = c.iterator(); it.hasNext();) {
106 result.add(t.transform(it.next()));
107 }
108 return result;
109 }
110 }
111
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