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1 package org.apache.bcel; 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.classfile.JavaClass; 58 import org.apache.bcel.util.*; 59 import java.io.*; 60 61 /*** 62 * The repository maintains informations about class interdependencies, e.g., 63 * whether a class is a sub-class of another. Delegates actual class loading 64 * to SyntheticRepository with current class path by default. 65 * 66 * @see org.apache.bcel.util.Repository 67 * @see org.apache.bcel.util.SyntheticRepository 68 * 69 * @version $Id: Repository.java,v 1.11 2002/10/11 20:34:47 mdahm Exp $ 70 * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A> 71 */ 72 public abstract class Repository { 73 private static org.apache.bcel.util.Repository _repository = 74 SyntheticRepository.getInstance(); 75 76 /*** @return currently used repository instance 77 */ 78 public static org.apache.bcel.util.Repository getRepository() { 79 return _repository; 80 } 81 82 /*** Set repository instance to be used for class loading 83 */ 84 public static void setRepository(org.apache.bcel.util.Repository rep) { 85 _repository = rep; 86 } 87 88 /*** Lookup class somewhere found on your CLASSPATH, or whereever the 89 * repository instance looks for it. 90 * 91 * @return class object for given fully qualified class name, or null 92 * if the class could not be found or parsed correctly 93 */ 94 public static JavaClass lookupClass(String class_name) { 95 try { 96 JavaClass clazz = _repository.findClass(class_name); 97 98 if(clazz == null) { 99 return _repository.loadClass(class_name); 100 } else { 101 return clazz; 102 } 103 } catch(ClassNotFoundException ex) { return null; } 104 } 105 106 /*** 107 * Try to find class source via getResourceAsStream(). 108 * @see Class 109 * @return JavaClass object for given runtime class 110 */ 111 public static JavaClass lookupClass(Class clazz) { 112 try { 113 return _repository.loadClass(clazz); 114 } catch(ClassNotFoundException ex) { return null; } 115 } 116 117 /*** @return class file object for given Java class. 118 */ 119 public static ClassPath.ClassFile lookupClassFile(String class_name) { 120 try { 121 return ClassPath.SYSTEM_CLASS_PATH.getClassFile(class_name); 122 } catch(IOException e) { return null; } 123 } 124 125 /*** Clear the repository. 126 */ 127 public static void clearCache() { 128 _repository.clear(); 129 } 130 131 /*** 132 * Add clazz to repository if there isn't an equally named class already in there. 133 * 134 * @return old entry in repository 135 */ 136 public static JavaClass addClass(JavaClass clazz) { 137 JavaClass old = _repository.findClass(clazz.getClassName()); 138 _repository.storeClass(clazz); 139 return old; 140 } 141 142 /*** 143 * Remove class with given (fully qualified) name from repository. 144 */ 145 public static void removeClass(String clazz) { 146 _repository.removeClass(_repository.findClass(clazz)); 147 } 148 149 /*** 150 * Remove given class from repository. 151 */ 152 public static void removeClass(JavaClass clazz) { 153 _repository.removeClass(clazz); 154 } 155 156 /*** 157 * @return list of super classes of clazz in ascending order, i.e., 158 * Object is always the last element 159 */ 160 public static JavaClass[] getSuperClasses(JavaClass clazz) { 161 return clazz.getSuperClasses(); 162 } 163 164 /*** 165 * @return list of super classes of clazz in ascending order, i.e., 166 * Object is always the last element. return "null", if class 167 * cannot be found. 168 */ 169 public static JavaClass[] getSuperClasses(String class_name) { 170 JavaClass jc = lookupClass(class_name); 171 return (jc == null? null : getSuperClasses(jc)); 172 } 173 174 /*** 175 * @return all interfaces implemented by class and its super 176 * classes and the interfaces that those interfaces extend, and so on. 177 * (Some people call this a transitive hull). 178 */ 179 public static JavaClass[] getInterfaces(JavaClass clazz) { 180 return clazz.getAllInterfaces(); 181 } 182 183 /*** 184 * @return all interfaces implemented by class and its super 185 * classes and the interfaces that extend those interfaces, and so on 186 */ 187 public static JavaClass[] getInterfaces(String class_name) { 188 return getInterfaces(lookupClass(class_name)); 189 } 190 191 /*** 192 * Equivalent to runtime "instanceof" operator. 193 * @return true, if clazz is an instance of super_class 194 */ 195 public static boolean instanceOf(JavaClass clazz, JavaClass super_class) { 196 return clazz.instanceOf(super_class); 197 } 198 199 /*** 200 * @return true, if clazz is an instance of super_class 201 */ 202 public static boolean instanceOf(String clazz, String super_class) { 203 return instanceOf(lookupClass(clazz), lookupClass(super_class)); 204 } 205 206 /*** 207 * @return true, if clazz is an instance of super_class 208 */ 209 public static boolean instanceOf(JavaClass clazz, String super_class) { 210 return instanceOf(clazz, lookupClass(super_class)); 211 } 212 213 /*** 214 * @return true, if clazz is an instance of super_class 215 */ 216 public static boolean instanceOf(String clazz, JavaClass super_class) { 217 return instanceOf(lookupClass(clazz), super_class); 218 } 219 220 /*** 221 * @return true, if clazz is an implementation of interface inter 222 */ 223 public static boolean implementationOf(JavaClass clazz, JavaClass inter) { 224 return clazz.implementationOf(inter); 225 } 226 227 /*** 228 * @return true, if clazz is an implementation of interface inter 229 */ 230 public static boolean implementationOf(String clazz, String inter) { 231 return implementationOf(lookupClass(clazz), lookupClass(inter)); 232 } 233 234 /*** 235 * @return true, if clazz is an implementation of interface inter 236 */ 237 public static boolean implementationOf(JavaClass clazz, String inter) { 238 return implementationOf(clazz, lookupClass(inter)); 239 } 240 241 /*** 242 * @return true, if clazz is an implementation of interface inter 243 */ 244 public static boolean implementationOf(String clazz, JavaClass inter) { 245 return implementationOf(lookupClass(clazz), inter); 246 } 247 } 248

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