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1 package org.apache.bcel.generic; 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 org.apache.bcel.Constants; 57 import org.apache.bcel.Repository; 58 import org.apache.bcel.classfile.JavaClass; 59 60 /*** 61 * Denotes reference such as java.lang.String. 62 * 63 * @version $Id: ObjectType.java,v 1.1.1.1 2001/10/29 20:00:25 jvanzyl Exp $ 64 * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A> 65 */ 66 public final class ObjectType extends ReferenceType { 67 private String class_name; // Class name of type 68 69 /*** 70 * @param class_name fully qualified class name, e.g. java.lang.String 71 */ 72 public ObjectType(String class_name) { 73 super(Constants.T_REFERENCE, "L" + class_name.replace('.', '/') + ";"); 74 this.class_name = class_name.replace('/', '.'); 75 } 76 77 /*** @return name of referenced class 78 */ 79 public String getClassName() { return class_name; } 80 81 /*** @return a hash code value for the object. 82 */ 83 public int hashCode() { return class_name.hashCode(); } 84 85 /*** @return true if both type objects refer to the same class. 86 */ 87 public boolean equals(Object type) { 88 return (type instanceof ObjectType)? 89 ((ObjectType)type).class_name.equals(class_name) : false; 90 } 91 92 /*** 93 * If "this" doesn't reference a class, it references an interface 94 * or a non-existant entity. 95 */ 96 public boolean referencesClass(){ 97 JavaClass jc = Repository.lookupClass(class_name); 98 if (jc == null) 99 return false; 100 else 101 return jc.isClass(); 102 } 103 104 /*** 105 * If "this" doesn't reference an interface, it references a class 106 * or a non-existant entity. 107 */ 108 public boolean referencesInterface(){ 109 JavaClass jc = Repository.lookupClass(class_name); 110 if (jc == null) 111 return false; 112 else 113 return !jc.isClass(); 114 } 115 116 public boolean subclassOf(ObjectType superclass){ 117 if (this.referencesInterface() || superclass.referencesInterface()) 118 return false; 119 120 return Repository.instanceOf(this.class_name, superclass.class_name); 121 } 122 123 /*** 124 * Java Virtual Machine Specification edition 2, § 5.4.4 Access Control 125 */ 126 public boolean accessibleTo(ObjectType accessor) { 127 JavaClass jc = Repository.lookupClass(class_name); 128 129 if(jc.isPublic()) { 130 return true; 131 } else { 132 JavaClass acc = Repository.lookupClass(accessor.class_name); 133 return acc.getPackageName().equals(jc.getPackageName()); 134 } 135 } 136 }

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