001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 * 017 */ 018package org.apache.bcel; 019 020import java.io.IOException; 021 022import org.apache.bcel.classfile.JavaClass; 023import org.apache.bcel.util.ClassPath; 024import org.apache.bcel.util.SyntheticRepository; 025 026/** 027 * The repository maintains informations about class interdependencies, e.g., 028 * whether a class is a sub-class of another. Delegates actual class loading 029 * to SyntheticRepository with current class path by default. 030 * 031 * @see org.apache.bcel.util.Repository 032 * @see SyntheticRepository 033 * 034 * @version $Id: Repository.java 1749603 2016-06-21 20:50:19Z ggregory $ 035 */ 036public abstract class Repository { 037 038 private static org.apache.bcel.util.Repository repository = SyntheticRepository.getInstance(); 039 040 041 /** @return currently used repository instance 042 */ 043 public static org.apache.bcel.util.Repository getRepository() { 044 return repository; 045 } 046 047 048 /** Set repository instance to be used for class loading 049 */ 050 public static void setRepository( final org.apache.bcel.util.Repository rep ) { 051 repository = rep; 052 } 053 054 055 /** Lookup class somewhere found on your CLASSPATH, or whereever the 056 * repository instance looks for it. 057 * 058 * @return class object for given fully qualified class name 059 * @throws ClassNotFoundException if the class could not be found or 060 * parsed correctly 061 */ 062 public static JavaClass lookupClass( final String class_name ) throws ClassNotFoundException { 063 return repository.loadClass(class_name); 064 } 065 066 067 /** 068 * Try to find class source using the internal repository instance. 069 * @see Class 070 * @return JavaClass object for given runtime class 071 * @throws ClassNotFoundException if the class could not be found or 072 * parsed correctly 073 */ 074 public static JavaClass lookupClass( final Class<?> clazz ) throws ClassNotFoundException { 075 return repository.loadClass(clazz); 076 } 077 078 079 /** 080 * @return class file object for given Java class by looking on the 081 * system class path; returns null if the class file can't be 082 * found 083 */ 084 public static ClassPath.ClassFile lookupClassFile( final String class_name ) { 085 try { 086 final ClassPath path = repository.getClassPath(); 087 if (path == null) { 088 return null; 089 } 090 return path.getClassFile(class_name); 091 } catch (final IOException e) { 092 return null; 093 } 094 } 095 096 097 /** Clear the repository. 098 */ 099 public static void clearCache() { 100 repository.clear(); 101 } 102 103 104 /** 105 * Add clazz to repository if there isn't an equally named class already in there. 106 * 107 * @return old entry in repository 108 */ 109 public static JavaClass addClass( final JavaClass clazz ) { 110 final JavaClass old = repository.findClass(clazz.getClassName()); 111 repository.storeClass(clazz); 112 return old; 113 } 114 115 116 /** 117 * Remove class with given (fully qualified) name from repository. 118 */ 119 public static void removeClass( final String clazz ) { 120 repository.removeClass(repository.findClass(clazz)); 121 } 122 123 124 /** 125 * Remove given class from repository. 126 */ 127 public static void removeClass( final JavaClass clazz ) { 128 repository.removeClass(clazz); 129 } 130 131 132 /** 133 * @return list of super classes of clazz in ascending order, i.e., 134 * Object is always the last element 135 * @throws ClassNotFoundException if any of the superclasses can't be found 136 */ 137 public static JavaClass[] getSuperClasses( final JavaClass clazz ) throws ClassNotFoundException { 138 return clazz.getSuperClasses(); 139 } 140 141 142 /** 143 * @return list of super classes of clazz in ascending order, i.e., 144 * Object is always the last element. 145 * @throws ClassNotFoundException if the named class or any of its 146 * superclasses can't be found 147 */ 148 public static JavaClass[] getSuperClasses( final String class_name ) throws ClassNotFoundException { 149 final JavaClass jc = lookupClass(class_name); 150 return getSuperClasses(jc); 151 } 152 153 154 /** 155 * @return all interfaces implemented by class and its super 156 * classes and the interfaces that those interfaces extend, and so on. 157 * (Some people call this a transitive hull). 158 * @throws ClassNotFoundException if any of the class's 159 * superclasses or superinterfaces can't be found 160 */ 161 public static JavaClass[] getInterfaces( final JavaClass clazz ) throws ClassNotFoundException { 162 return clazz.getAllInterfaces(); 163 } 164 165 166 /** 167 * @return all interfaces implemented by class and its super 168 * classes and the interfaces that extend those interfaces, and so on 169 * @throws ClassNotFoundException if the named class can't be found, 170 * or if any of its superclasses or superinterfaces can't be found 171 */ 172 public static JavaClass[] getInterfaces( final String class_name ) throws ClassNotFoundException { 173 return getInterfaces(lookupClass(class_name)); 174 } 175 176 177 /** 178 * Equivalent to runtime "instanceof" operator. 179 * @return true, if clazz is an instance of super_class 180 * @throws ClassNotFoundException if any superclasses or superinterfaces 181 * of clazz can't be found 182 */ 183 public static boolean instanceOf( final JavaClass clazz, final JavaClass super_class ) 184 throws ClassNotFoundException { 185 return clazz.instanceOf(super_class); 186 } 187 188 189 /** 190 * @return true, if clazz is an instance of super_class 191 * @throws ClassNotFoundException if either clazz or super_class 192 * can't be found 193 */ 194 public static boolean instanceOf( final String clazz, final String super_class ) 195 throws ClassNotFoundException { 196 return instanceOf(lookupClass(clazz), lookupClass(super_class)); 197 } 198 199 200 /** 201 * @return true, if clazz is an instance of super_class 202 * @throws ClassNotFoundException if super_class can't be found 203 */ 204 public static boolean instanceOf( final JavaClass clazz, final String super_class ) 205 throws ClassNotFoundException { 206 return instanceOf(clazz, lookupClass(super_class)); 207 } 208 209 210 /** 211 * @return true, if clazz is an instance of super_class 212 * @throws ClassNotFoundException if clazz can't be found 213 */ 214 public static boolean instanceOf( final String clazz, final JavaClass super_class ) 215 throws ClassNotFoundException { 216 return instanceOf(lookupClass(clazz), super_class); 217 } 218 219 220 /** 221 * @return true, if clazz is an implementation of interface inter 222 * @throws ClassNotFoundException if any superclasses or superinterfaces 223 * of clazz can't be found 224 */ 225 public static boolean implementationOf( final JavaClass clazz, final JavaClass inter ) 226 throws ClassNotFoundException { 227 return clazz.implementationOf(inter); 228 } 229 230 231 /** 232 * @return true, if clazz is an implementation of interface inter 233 * @throws ClassNotFoundException if clazz, inter, or any superclasses 234 * or superinterfaces of clazz can't be found 235 */ 236 public static boolean implementationOf( final String clazz, final String inter ) 237 throws ClassNotFoundException { 238 return implementationOf(lookupClass(clazz), lookupClass(inter)); 239 } 240 241 242 /** 243 * @return true, if clazz is an implementation of interface inter 244 * @throws ClassNotFoundException if inter or any superclasses 245 * or superinterfaces of clazz can't be found 246 */ 247 public static boolean implementationOf( final JavaClass clazz, final String inter ) 248 throws ClassNotFoundException { 249 return implementationOf(clazz, lookupClass(inter)); 250 } 251 252 253 /** 254 * @return true, if clazz is an implementation of interface inter 255 * @throws ClassNotFoundException if clazz or any superclasses or 256 * superinterfaces of clazz can't be found 257 */ 258 public static boolean implementationOf( final String clazz, final JavaClass inter ) 259 throws ClassNotFoundException { 260 return implementationOf(lookupClass(clazz), inter); 261 } 262}