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1 package org.apache.bcel.verifier; 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 java.util.HashMap; 58 import java.util.Iterator; 59 import java.util.Vector; 60 61 /*** 62 * This class produces instances of the Verifier class. Its purpose is to make 63 * sure that they are singleton instances with respect to the class name they 64 * operate on. That means, for every class (represented by a unique fully qualified 65 * class name) there is exactly one Verifier. 66 * 67 * @version $Id: VerifierFactory.java,v 1.2 2002/02/07 23:22:30 enver Exp $ 68 * @author <A HREF="http://www.inf.fu-berlin.de/~ehaase"/>Enver Haase</A> 69 * @see org.apache.bcel.verifier.Verifier 70 */ 71 public class VerifierFactory{ 72 73 /*** 74 * The HashMap that holds the data about the already-constructed Verifier instances. 75 */ 76 private static HashMap hashMap = new HashMap(); 77 78 /*** 79 * The VerifierFactoryObserver instances that observe the VerifierFactory. 80 */ 81 private static Vector observers = new Vector(); 82 83 /*** 84 * The VerifierFactory is not instantiable. 85 */ 86 private VerifierFactory(){} 87 88 /*** 89 * Returns the (only) verifier responsible for the class with the given name. 90 * Possibly a new Verifier object is transparently created. 91 * @return the (only) verifier responsible for the class with the given name. 92 */ 93 public static Verifier getVerifier(String fully_qualified_classname){ 94 fully_qualified_classname = fully_qualified_classname; 95 96 Verifier v = (Verifier) (hashMap.get(fully_qualified_classname)); 97 if (v==null){ 98 v = new Verifier(fully_qualified_classname); 99 hashMap.put(fully_qualified_classname, v); 100 notify(fully_qualified_classname); 101 } 102 103 return v; 104 } 105 106 /*** 107 * Notifies the observers of a newly generated Verifier. 108 */ 109 private static void notify(String fully_qualified_classname){ 110 // notify the observers 111 Iterator i = observers.iterator(); 112 while (i.hasNext()){ 113 VerifierFactoryObserver vfo = (VerifierFactoryObserver) i.next(); 114 vfo.update(fully_qualified_classname); 115 } 116 } 117 118 /*** 119 * Returns all Verifier instances created so far. 120 * This is useful when a Verifier recursively lets 121 * the VerifierFactory create other Verifier instances 122 * and if you want to verify the transitive hull of 123 * referenced class files. 124 */ 125 public static Verifier[] getVerifiers(){ 126 Verifier[] vs = new Verifier[hashMap.values().size()]; 127 return (Verifier[]) (hashMap.values().toArray(vs)); // Because vs is big enough, vs is used to store the values into and returned! 128 } 129 130 /*** 131 * Adds the VerifierFactoryObserver o to the list of observers. 132 */ 133 public static void attach(VerifierFactoryObserver o){ 134 observers.addElement(o); 135 } 136 137 /*** 138 * Removes the VerifierFactoryObserver o from the list of observers. 139 */ 140 public static void detach(VerifierFactoryObserver o){ 141 observers.removeElement(o); 142 } 143 }

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