1   package org.apache.bcel.util;
2   
3   /* ====================================================================
4    * The Apache Software License, Version 1.1
5    *
6    * Copyright (c) 2001 The Apache Software Foundation.  All rights
7    * reserved.
8    *
9    * Redistribution and use in source and binary forms, with or without
10   * modification, are permitted provided that the following conditions
11   * are met:
12   *
13   * 1. Redistributions of source code must retain the above copyright
14   *    notice, this list of conditions and the following disclaimer.
15   *
16   * 2. Redistributions in binary form must reproduce the above copyright
17   *    notice, this list of conditions and the following disclaimer in
18   *    the documentation and/or other materials provided with the
19   *    distribution.
20   *
21   * 3. The end-user documentation included with the redistribution,
22   *    if any, must include the following acknowledgment:
23   *       "This product includes software developed by the
24   *        Apache Software Foundation (http://www.apache.org/)."
25   *    Alternately, this acknowledgment may appear in the software itself,
26   *    if and wherever such third-party acknowledgments normally appear.
27   *
28   * 4. The names "Apache" and "Apache Software Foundation" and
29   *    "Apache BCEL" must not be used to endorse or promote products
30   *    derived from this software without prior written permission. For
31   *    written permission, please contact apache@apache.org.
32   *
33   * 5. Products derived from this software may not be called "Apache",
34   *    "Apache BCEL", nor may "Apache" appear in their name, without
35   *    prior written permission of the Apache Software Foundation.
36   *
37   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
38   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
39   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
40   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
41   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
43   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
44   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
45   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
46   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
47   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
48   * SUCH DAMAGE.
49   * ====================================================================
50   *
51   * This software consists of voluntary contributions made by many
52   * individuals on behalf of the Apache Software Foundation.  For more
53   * information on the Apache Software Foundation, please see
54   * <http://www.apache.org/>.
55   */
56  import java.util.HashMap;
57  import java.util.Collection;
58  import org.apache.bcel.classfile.JavaClass;
59  
60  /*** 
61   * Utility class implementing a (typesafe) set of JavaClass objects.
62   * Since JavaClass has no equals() method, the name of the class is
63   * used for comparison.
64   *
65   * @version $Id: ClassSet.java,v 1.2 2003/02/13 11:18:23 enver Exp $
66   * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A> 
67   * @see ClassStack
68  */
69  public class ClassSet implements java.io.Serializable {
70    private HashMap _map = new HashMap();
71  
72    public boolean add(JavaClass clazz) {
73      boolean result = false;
74  
75      if(!_map.containsKey(clazz.getClassName())) {
76        result = true;
77        _map.put(clazz.getClassName(), clazz);
78      }
79  
80      return result;
81    }
82  
83    public void      remove(JavaClass clazz) { _map.remove(clazz.getClassName()); }
84    public boolean   empty()                 { return _map.isEmpty(); }
85  
86    public JavaClass[] toArray() {
87      Collection values = _map.values();
88      JavaClass[] classes = new JavaClass[values.size()];
89      values.toArray(classes);
90      return classes;
91    }
92  
93    public String[] getClassNames() {
94      return (String[])_map.keySet().toArray(new String[_map.keySet().size()]);
95    }
96  }  
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