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310 lines
10 KiB
310 lines
10 KiB
/* jode.bytecode.ClassInfo 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.MethodType;
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import java.io.*;
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import java.util.*;
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import java.lang.reflect.Modifier;
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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 ClassInfo extends BinaryInfo {
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private String name;
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private static SearchPath classpath;
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private static Hashtable classes = new Hashtable(); // XXX - weak map
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private int status = 0;
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private ConstantPool constantPool;
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private int modifiers = -1;
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private ClassInfo superclass;
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private ClassInfo[] interfaces;
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private FieldInfo[] fields;
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private MethodInfo[] methods;
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private AttributeInfo[] attributes;
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public final static ClassInfo javaLangObject = forName("java.lang.Object");
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public static void setClassPath(String path) {
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classpath = new SearchPath(path);
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Enumeration enum = classes.elements();
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while (enum.hasMoreElements()) {
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ClassInfo ci = (ClassInfo) enum.nextElement();
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ci.status = 0;
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ci.superclass = null;
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ci.fields = null;
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ci.interfaces = null;
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ci.methods = null;
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ci.attributes = null;
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}
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}
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public static boolean exists(String name) {
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return classpath.exists(name.replace('.', '/') + ".class");
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}
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public static boolean isPackage(String name) {
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return classpath.isDirectory(name.replace('.', '/'));
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}
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public static Enumeration getClasses(final String packageName) {
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final Enumeration enum =
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classpath.listClassFiles(packageName.replace('.','/'));
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return new Enumeration() {
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public boolean hasMoreElements() {
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return enum.hasMoreElements();
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}
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public Object nextElement() {
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String name = (String) enum.nextElement();
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if (!name.endsWith(".class"))
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throw new jode.AssertError("Wrong file name");
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name.substring(0, name.length()-6);
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return ClassInfo.forName(packageName+"."+ name);
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}
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};
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}
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public static ClassInfo 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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ClassInfo clazz = (ClassInfo) classes.get(name);
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if (clazz == null) {
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clazz = new ClassInfo(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 ClassInfo(String name) {
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this.name = name;
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}
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private void readHeader(DataInputStream input, int howMuch)
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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 ConstantPool readConstants(DataInputStream input, int howMuch)
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throws IOException {
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ConstantPool cpool = new ConstantPool();
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cpool.read(input);
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return cpool;
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}
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private void readNameAndSuper(ConstantPool cpool,
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DataInputStream input, int howMuch)
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throws IOException {
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modifiers = input.readUnsignedShort();
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String name = cpool.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 = ClassInfo.forName
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(cpool.getClassName(input.readUnsignedShort()));
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}
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private void readInterfaces(ConstantPool cpool,
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DataInputStream input, int howMuch)
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throws IOException {
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int count = input.readUnsignedShort();
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interfaces = new ClassInfo[count];
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for (int i=0; i< count; i++) {
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interfaces[i] = ClassInfo.forName
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(cpool.getClassName(input.readUnsignedShort()));
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}
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}
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private void readFields(ConstantPool cpool,
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DataInputStream input, int howMuch)
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throws IOException {
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if ((howMuch & FIELDS) != 0) {
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int count = input.readUnsignedShort();
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fields = new FieldInfo[count];
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for (int i=0; i< count; i++) {
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fields[i] = new FieldInfo();
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fields[i].read(cpool, input, howMuch);
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}
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} else {
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int count = input.readUnsignedShort();
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fields = new FieldInfo[count];
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for (int i=0; i< count; i++) {
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input.readUnsignedShort(); // modifier
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input.readUnsignedShort(); // name
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input.readUnsignedShort(); // type
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skipAttributes(input);
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}
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}
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}
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private void readMethods(ConstantPool cpool,
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DataInputStream input, int howMuch)
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throws IOException {
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if ((howMuch & METHODS) != 0) {
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int count = input.readUnsignedShort();
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methods = new MethodInfo[count];
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for (int i=0; i< count; i++) {
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methods[i] = new MethodInfo();
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methods[i].read(cpool, input, howMuch);
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}
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} else {
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int count = input.readUnsignedShort();
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fields = new FieldInfo[count];
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for (int i=0; i< count; i++) {
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input.readUnsignedShort(); // modifier
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input.readUnsignedShort(); // name
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input.readUnsignedShort(); // type
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skipAttributes(input);
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}
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}
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}
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public void loadInfo(int howMuch) {
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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, howMuch);
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ConstantPool cpool = readConstants(input, howMuch);
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if ((howMuch & CONSTANTS) != 0)
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this.constantPool = cpool;
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readNameAndSuper(cpool, input, howMuch);
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readInterfaces(cpool, input, howMuch);
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if ((howMuch & HIERARCHY) != 0)
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status |= HIERARCHY;
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readFields(cpool, input, howMuch);
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readMethods(cpool, input, howMuch);
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readAttributes(cpool, input, howMuch);
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status |= howMuch;
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} catch (IOException ex) {
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String message = ex.getLocalizedMessage();
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if ((howMuch & ~(METHODS|HIERARCHY)) == 0)
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jode.Decompiler.err.println
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("Can't read class " + name + ", types may be incorrect. ("
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+ ex.getClass().getName()
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+ (message != null ? ": " + message : "") + ")");
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else
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jode.Decompiler.err.println
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("Can't read class " + name
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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 = ClassInfo.forName("java.lang.Object");
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interfaces = new ClassInfo[0];
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modifiers = Modifier.PUBLIC;
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status = FULLINFO;
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}
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}
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public ClassInfo getSuperclass() {
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if ((status & HIERARCHY) == 0)
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loadInfo(HIERARCHY);
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return superclass;
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}
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public ClassInfo[] getInterfaces() {
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if ((status & HIERARCHY) == 0)
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loadInfo(HIERARCHY);
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return interfaces;
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}
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public int getModifiers() {
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if ((status & HIERARCHY) == 0)
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loadInfo(HIERARCHY);
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return modifiers;
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}
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public boolean isInterface() {
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return Modifier.isInterface(getModifiers());
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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(ClassInfo 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(ClassInfo clazz) {
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while (clazz != this && clazz != null) {
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ClassInfo[] 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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public ConstantPool getConstantPool() {
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if ((status & CONSTANTS) == 0)
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loadInfo(CONSTANTS);
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return constantPool;
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}
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public MethodInfo findMethod(String name, MethodType type) {
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if ((status & METHODS) == 0)
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loadInfo(METHODS);
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for (int i=0; i< methods.length; i++)
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if (methods[i].getName().equals(name)
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&& methods[i].getType().equals(type))
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return methods[i];
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return null;
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}
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public MethodInfo[] getMethods() {
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if ((status & METHODS) == 0)
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loadInfo(METHODS);
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return methods;
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}
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public FieldInfo[] getFields() {
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if ((status & FIELDS) == 0)
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loadInfo(FIELDS);
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return fields;
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}
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}
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