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177 lines
5.6 KiB
177 lines
5.6 KiB
/* jode.bytecode.ClassHierarchy Copyright (C) 1997-1998 Jochen Hoenicke.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* $Id$
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*/
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package jode.bytecode;
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import jode.SearchPath;
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import java.io.*;
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import java.util.Hashtable;
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/**
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* This class does represent a class similar to java.lang.Class. You
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* can get the super class and the interfaces.
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*
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* The main difference to java.lang.Class is, that the objects are builded
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* from a stream containing the .class file, and that it uses the
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* <code>jode.Type</code> to represent types instead of Class itself.
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*
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* @author Jochen Hoenicke
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*/
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public class ClassHierarchy {
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private String name;
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private int modifiers = -1;
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private ClassHierarchy superclass;
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private ClassHierarchy[] interfaces;
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private static SearchPath classpath;
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private ConstantPool constantPool;
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private static Hashtable classes = new Hashtable(); // XXX - weak map
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public final static ClassHierarchy javaLangObject =
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ClassHierarchy.forName("java.lang.Object");
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public static void setClassPath(SearchPath path) {
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classpath = path;
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}
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public static ClassHierarchy forName(String name) {
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if (name == null)
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return null;
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name = name.replace('/', '.');
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ClassHierarchy clazz = (ClassHierarchy) classes.get(name);
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if (clazz == null) {
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clazz = new ClassHierarchy(name);
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classes.put(name, clazz);
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}
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return clazz;
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}
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public ClassHierarchy(String name) {
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this.name = name;
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}
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private void readHeader(DataInputStream input)
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throws IOException {
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if (input.readInt() != 0xcafebabe)
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throw new ClassFormatException("Wrong magic");
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if (input.readUnsignedShort() > 3)
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throw new ClassFormatException("Wrong minor");
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if (input.readUnsignedShort() != 45)
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throw new ClassFormatException("Wrong major");
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}
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private void readConstants(DataInputStream input)
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throws IOException {
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constantPool = new ConstantPool();
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constantPool.read(input);
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}
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private void readNameAndSuper(DataInputStream input)
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throws IOException {
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modifiers = input.readUnsignedShort();
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String name = constantPool.getClassName(input.readUnsignedShort());
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if (!this.name.equals(name))
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new ClassFormatException("Class has wrong name: "+name);
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superclass = ClassHierarchy.forName
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(constantPool.getClassName(input.readUnsignedShort()));
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}
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private void readInterfaces(DataInputStream input)
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throws IOException {
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int count = input.readUnsignedShort();
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interfaces = new ClassHierarchy[count];
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for (int i=0; i< count; i++) {
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interfaces[i] = ClassHierarchy.forName
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(constantPool.getClassName(input.readUnsignedShort()));
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}
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}
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private void loadHierarchy() {
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try {
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DataInputStream input =
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new DataInputStream(classpath.getFile(name.replace('.', '/')
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+ ".class"));
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readHeader(input);
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readConstants(input);
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readNameAndSuper(input);
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readInterfaces(input);
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constantPool = null; // Now allow clean up
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} catch (IOException ex) {
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String message = ex.getLocalizedMessage();
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System.err.println("Can't read class " + name
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+ ", types may be incorrect. ("
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+ ex.getClass().getName()
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+ (message != null ? ": " + message : "")+")");
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if (name.equals("java.lang.Object"))
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superclass = null;
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else
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superclass = ClassHierarchy.forName("java.lang.Object");
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interfaces = new ClassHierarchy[0];
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}
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}
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public ClassHierarchy getSuperclass() {
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if (interfaces == null)
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loadHierarchy();
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return superclass;
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}
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public ClassHierarchy[] getInterfaces() {
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if (interfaces == null)
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loadHierarchy();
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return interfaces;
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}
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public int getModifiers() {
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return modifiers;
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}
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public boolean isInterface() {
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if (interfaces == null)
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loadHierarchy();
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return java.lang.reflect.Modifier.isInterface(modifiers);
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}
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public String toString() {
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return name;
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}
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public String getName() {
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return name;
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}
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public boolean superClassOf(ClassHierarchy son) {
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while (son != this && son != null) {
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son = son.getSuperclass();
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}
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return son == this;
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}
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public boolean implementedBy(ClassHierarchy clazz) {
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while (clazz != this && clazz != null) {
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ClassHierarchy[] ifaces = clazz.getInterfaces();
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for (int i=0; i< ifaces.length; i++) {
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if (implementedBy(ifaces[i]))
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return true;
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}
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clazz = clazz.getSuperclass();
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}
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return clazz == this;
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}
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}
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