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1   /*
2    * Copyright  2000-2004 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   */
17  package org.apache.bcel.util;
18  
19  import java.util.Collection;
20  import java.util.HashMap;
21  import java.util.Map;
22  import org.apache.bcel.classfile.JavaClass;
23  
24  /*** 
25   * Utility class implementing a (typesafe) set of JavaClass objects.
26   * Since JavaClass has no equals() method, the name of the class is
27   * used for comparison.
28   *
29   * @version $Id: ClassSet.java 386056 2006-03-15 11:31:56Z tcurdt $
30   * @author <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A> 
31   * @see ClassStack
32   */
33  public class ClassSet implements java.io.Serializable {
34  
35      private Map _map = new HashMap();
36  
37  
38      public boolean add( JavaClass clazz ) {
39          boolean result = false;
40          if (!_map.containsKey(clazz.getClassName())) {
41              result = true;
42              _map.put(clazz.getClassName(), clazz);
43          }
44          return result;
45      }
46  
47  
48      public void remove( JavaClass clazz ) {
49          _map.remove(clazz.getClassName());
50      }
51  
52  
53      public boolean empty() {
54          return _map.isEmpty();
55      }
56  
57  
58      public JavaClass[] toArray() {
59          Collection values = _map.values();
60          JavaClass[] classes = new JavaClass[values.size()];
61          values.toArray(classes);
62          return classes;
63      }
64  
65  
66      public String[] getClassNames() {
67          return (String[]) _map.keySet().toArray(new String[_map.keySet().size()]);
68      }
69  }