Java tutorial
package org.aspectj.apache.bcel; /* ==================================================================== * The Apache Software License, Version 1.1 * * Copyright (c) 2001 The Apache Software Foundation. All rights * reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. 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For more * information on the Apache Software Foundation, please see * <http://www.apache.org/>. */ import java.io.IOException; import org.aspectj.apache.bcel.classfile.JavaClass; import org.aspectj.apache.bcel.util.ClassPath; import org.aspectj.apache.bcel.util.SyntheticRepository; /** * The repository maintains informations about class interdependencies, e.g., whether a class is a sub-class of another. Delegates * actual class loading to SyntheticRepository with current class path by default. * * @see org.aspectj.apache.bcel.util.Repository * @see org.aspectj.apache.bcel.util.SyntheticRepository * * @version $Id: Repository.java,v 1.6 2009/09/09 22:18:20 aclement Exp $ * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A> */ public abstract class Repository { private static org.aspectj.apache.bcel.util.Repository _repository = null; /** * @return currently used repository instance */ public static org.aspectj.apache.bcel.util.Repository getRepository() { if (_repository == null) { _repository = SyntheticRepository.getInstance(); } return _repository; } /** * Set repository instance to be used for class loading */ public static void setRepository(org.aspectj.apache.bcel.util.Repository rep) { _repository = rep; } /** * Lookup class somewhere found on your CLASSPATH, or whereever the repository instance looks for it. * * @return class object for given fully qualified class name, or null if the class could not be found or parsed correctly */ public static JavaClass lookupClass(String class_name) { try { JavaClass clazz = getRepository().findClass(class_name); if (clazz != null) { return clazz; } return getRepository().loadClass(class_name); } catch (ClassNotFoundException ex) { return null; } } // /** // * Try to find class source via getResourceAsStream(). // * // * @see Class // * @return JavaClass object for given runtime class // */ // public static JavaClass lookupClass(Class clazz) { // try { // return getRepository().loadClass(clazz); // } catch (ClassNotFoundException ex) { // return null; // } // } /** * @return class file object for given Java class. */ public static ClassPath.ClassFile lookupClassFile(String class_name) { try { return ClassPath.getSystemClassPath().getClassFile(class_name); } catch (IOException e) { return null; } } /** * Clear the repository. */ public static void clearCache() { getRepository().clear(); } /** * Add clazz to repository if there isn't an equally named class already in there. * * @return old entry in repository */ public static JavaClass addClass(JavaClass clazz) { JavaClass old = getRepository().findClass(clazz.getClassName()); getRepository().storeClass(clazz); return old; } /** * Remove class with given (fully qualified) name from repository. */ public static void removeClass(String clazz) { getRepository().removeClass(getRepository().findClass(clazz)); } // /** // * Remove given class from repository. // */ // public static void removeClass(JavaClass clazz) { // getRepository().removeClass(clazz); // } // /** // * @return list of super classes of clazz in ascending order, i.e., Object is always the last element // */ // public static JavaClass[] getSuperClasses(JavaClass clazz) { // return clazz.getSuperClasses(); // } // // /** // * @return list of super classes of clazz in ascending order, i.e., Object is always the last element. return "null", if class // * cannot be found. // */ // public static JavaClass[] getSuperClasses(String class_name) { // JavaClass jc = lookupClass(class_name); // return jc == null ? null : getSuperClasses(jc); // } // // /** // * @return all interfaces implemented by class and its super classes and the interfaces that those interfaces extend, and so // on. // * (Some people call this a transitive hull). // */ // public static JavaClass[] getInterfaces(JavaClass clazz) { // return clazz.getAllInterfaces(); // } // /** // * @return all interfaces implemented by class and its super classes and the interfaces that extend those interfaces, and so // on // */ // public static JavaClass[] getInterfaces(String class_name) { // return getInterfaces(lookupClass(class_name)); // } /** * Equivalent to runtime "instanceof" operator. * * @return true, if clazz is an instance of super_class */ public static boolean instanceOf(JavaClass clazz, JavaClass super_class) { return clazz.instanceOf(super_class); } /** * @return true, if clazz is an instance of super_class */ public static boolean instanceOf(String clazz, String super_class) { return instanceOf(lookupClass(clazz), lookupClass(super_class)); } // /** // * @return true, if clazz is an instance of super_class // */ // public static boolean instanceOf(JavaClass clazz, String super_class) { // return instanceOf(clazz, lookupClass(super_class)); // } // /** // * @return true, if clazz is an instance of super_class // */ // public static boolean instanceOf(String clazz, JavaClass super_class) { // return instanceOf(lookupClass(clazz), super_class); // } /** * @return true, if clazz is an implementation of interface inter */ public static boolean implementationOf(JavaClass clazz, JavaClass inter) { return clazz.implementationOf(inter); } /** * @return true, if clazz is an implementation of interface inter */ public static boolean implementationOf(String clazz, String inter) { return implementationOf(lookupClass(clazz), lookupClass(inter)); } // // /** // * @return true, if clazz is an implementation of interface inter // */ // public static boolean implementationOf(JavaClass clazz, String inter) { // return implementationOf(clazz, lookupClass(inter)); // } // /** // * @return true, if clazz is an implementation of interface inter // */ // public static boolean implementationOf(String clazz, JavaClass inter) { // return implementationOf(lookupClass(clazz), inter); // } }