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    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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