| package org.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. The end-user documentation included with the redistribution, |
| * if any, must include the following acknowledgment: |
| * "This product includes software developed by the |
| * Apache Software Foundation (http://www.apache.org/)." |
| * Alternately, this acknowledgment may appear in the software itself, |
| * if and wherever such third-party acknowledgments normally appear. |
| * |
| * 4. The names "Apache" and "Apache Software Foundation" and |
| * "Apache BCEL" must not be used to endorse or promote products |
| * derived from this software without prior written permission. For |
| * written permission, please contact apache@apache.org. |
| * |
| * 5. Products derived from this software may not be called "Apache", |
| * "Apache BCEL", nor may "Apache" appear in their name, without |
| * prior written permission of the Apache Software Foundation. |
| * |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR |
| * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| */ |
| |
| import org.apache.bcel.classfile.*; |
| import org.apache.bcel.util.*; |
| import java.util.HashMap; |
| import java.io.*; |
| |
| /** |
| * Repository maintains informations about class interdependencies, e.g. |
| * whether a class is a sub-class of another. JavaClass objects are put |
| * into a cache which can be purged with clearCache(). |
| * |
| * All JavaClass objects used as arguments must have been obtained via |
| * the repository or been added with addClass() manually. This is |
| * because we have to check for object identity (==). |
| * |
| * @version $Id$ |
| * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A |
| */ |
| public abstract class Repository { |
| private static ClassPath class_path = new ClassPath(); |
| private static HashMap classes; |
| private static JavaClass OBJECT; // should be final ... |
| |
| static { clearCache(); } |
| |
| /** @return class object for given fully qualified class name. |
| */ |
| public static JavaClass lookupClass(String class_name) { |
| if(class_name == null || class_name.equals("")) |
| throw new RuntimeException("Invalid class name"); |
| |
| class_name = class_name.replace('/', '.'); |
| |
| JavaClass clazz = (JavaClass)classes.get(class_name); |
| |
| if(clazz == null) { |
| try { |
| InputStream is = class_path.getInputStream(class_name); |
| clazz = new ClassParser(is, class_name).parse(); |
| class_name = clazz.getClassName(); |
| } catch(IOException e) { return null; } |
| |
| classes.put(class_name, clazz); |
| } |
| |
| return clazz; |
| } |
| |
| /** @return class file object for given Java class. |
| */ |
| public static ClassPath.ClassFile lookupClassFile(String class_name) { |
| try { |
| return class_path.getClassFile(class_name); |
| } catch(IOException e) { return null; } |
| } |
| |
| /** Clear the repository. |
| */ |
| public static void clearCache() { |
| classes = new HashMap(); |
| OBJECT = lookupClass("java.lang.Object"); |
| |
| if(OBJECT == null) |
| System.err.println("Warning: java.lang.Object not found on CLASSPATH!"); |
| else |
| classes.put("java.lang.Object", OBJECT); |
| } |
| |
| /** |
| * 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) { |
| String name = clazz.getClassName(); |
| JavaClass cl = (JavaClass)classes.get(name); |
| |
| if(cl == null) |
| classes.put(name, cl = clazz); |
| |
| return cl; |
| } |
| |
| /** |
| * Remove class with given (fully qualifid) name from repository. |
| */ |
| public static void removeClass(String clazz) { |
| classes.remove(clazz); |
| } |
| |
| /** |
| * Remove given class from repository. |
| */ |
| public static void removeClass(JavaClass clazz) { |
| removeClass(clazz.getClassName()); |
| } |
| |
| |
| private static final JavaClass getSuperClass(JavaClass clazz) { |
| if(clazz == OBJECT) |
| return null; |
| |
| return lookupClass(clazz.getSuperclassName()); |
| } |
| |
| /** |
| * @return list of super classes of clazz in ascending order, i.e., |
| * Object is always the last element |
| */ |
| public static JavaClass[] getSuperClasses(JavaClass clazz) { |
| ClassVector vec = new ClassVector(); |
| |
| for(clazz = getSuperClass(clazz); clazz != null; clazz = getSuperClass(clazz)) |
| vec.addElement(clazz); |
| |
| return vec.toArray(); |
| } |
| |
| /** |
| * @return list of super classes of clazz in ascending order, i.e., |
| * Object is always the last element. "null", if clazz 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 |
| */ |
| public static JavaClass[] getInterfaces(JavaClass clazz) { |
| ClassVector vec = new ClassVector(); |
| ClassQueue queue = new ClassQueue(); |
| |
| queue.enqueue(clazz); |
| |
| while(!queue.empty()) { |
| clazz = queue.dequeue(); |
| |
| String s = clazz.getSuperclassName(); |
| String[] interfaces = clazz.getInterfaceNames(); |
| |
| if(clazz.isInterface()) |
| vec.addElement(clazz); |
| else if(!s.equals("java.lang.Object")) |
| queue.enqueue(lookupClass(s)); |
| |
| for(int i=0; i < interfaces.length; i++) |
| queue.enqueue(lookupClass(interfaces[i])); |
| } |
| |
| return vec.toArray(); |
| } |
| |
| /** |
| * @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)); |
| } |
| |
| /** |
| * @return true, if clazz is an instance of super_class |
| */ |
| public static boolean instanceOf(JavaClass clazz, JavaClass super_class) { |
| if(clazz == super_class) |
| return true; |
| |
| JavaClass[] super_classes = getSuperClasses(clazz); |
| |
| for(int i=0; i < super_classes.length; i++) |
| if(super_classes[i] == super_class) |
| return true; |
| |
| if(super_class.isInterface()) |
| return implementationOf(clazz, super_class); |
| |
| return false; |
| } |
| |
| /** |
| * @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) { |
| if(clazz == inter) |
| return true; |
| |
| JavaClass[] super_interfaces = getInterfaces(clazz); |
| |
| for(int i=0; i < super_interfaces.length; i++) |
| if(super_interfaces[i] == inter) |
| return true; |
| |
| return false; |
| } |
| |
| /** |
| * @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); |
| } |
| } |