1   package org.apache.bcel.verifier.structurals;
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  
57  import org.apache.bcel.generic.*;
58  import java.util.HashSet;
59  import java.util.Hashtable;
60  
61  /***
62   * This class allows easy access to ExceptionHandler objects.
63   *
64   * @version $Id: ExceptionHandlers.java,v 1.1.1.1 2001/10/29 20:00:38 jvanzyl Exp $
65   * @author <A HREF="http://www.inf.fu-berlin.de/~ehaase"/>Enver Haase</A>
66   */
67  public class ExceptionHandlers{
68  	/***
69  	 * The ExceptionHandler instances.
70  	 * Key: InstructionHandle objects, Values: HashSet<ExceptionHandler> instances.
71  	 */
72  	private Hashtable exceptionhandlers;
73  	 
74  	/***
75  	 * Constructor. Creates a new ExceptionHandlers instance.
76  	 */
77  	public ExceptionHandlers(MethodGen mg){
78  		exceptionhandlers = new Hashtable();
79  		CodeExceptionGen[] cegs = mg.getExceptionHandlers();
80  		for (int i=0; i<cegs.length; i++){
81  			ExceptionHandler eh = new ExceptionHandler(cegs[i].getCatchType(), cegs[i].getHandlerPC());
82  			for (InstructionHandle ih=cegs[i].getStartPC(); ih != cegs[i].getEndPC().getNext(); ih=ih.getNext()){
83  				HashSet hs;
84  				hs = (HashSet) exceptionhandlers.get(ih);
85  				if (hs == null){
86  					hs = new HashSet();
87  					exceptionhandlers.put(ih, hs);
88  				}
89  				hs.add(eh);
90  			}
91  		}
92  	}
93  	
94  	/***
95  	 * Returns all the ExceptionHandler instances representing exception
96  	 * handlers that protect the instruction ih.
97  	 */
98  	public ExceptionHandler[] getExceptionHandlers(InstructionHandle ih){
99  		HashSet hs = (HashSet) exceptionhandlers.get(ih);
100 		if (hs == null) return new ExceptionHandler[0];
101 		else{
102 			ExceptionHandler[] ret = new ExceptionHandler[hs.size()];
103 			return (ExceptionHandler[]) (hs.toArray(ret));
104 		}
105 	}
106 
107 }
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