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249 lines
6.2 KiB
249 lines
6.2 KiB
/* Identifier Copyright (C) 1999 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.obfuscator;
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import jode.GlobalOptions;
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import jode.Obfuscator;
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import java.io.*;
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import java.util.Hashtable;
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public abstract class Identifier {
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/**
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* This is a doubly list of identifiers, that must have always
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* have the same names, and same preserved settings.
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*/
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private Identifier right = null;
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private Identifier left = null;
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private boolean reachable = false;
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private boolean preserved = false;
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private String alias = null;
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private boolean wasAliased = false;
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public Identifier(String alias) {
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this.alias = alias;
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}
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/**
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* Returns true, if this identifier is reachable in some way, false if it
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* is dead and can be removed.
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*/
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public final boolean isReachable() {
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return reachable;
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}
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/**
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* true, if this identifier must preserve its name, false if the
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* name may be obfuscated.
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*/
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public final boolean isPreserved() {
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return preserved;
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}
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/**
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* Marks this identifier as preserved. This will also make the
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* identifier reachable, if it isn't already.
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*
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* You shouldn't call this directly, but use setPreserved instead.
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*/
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protected void setSinglePreserved() {
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}
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/**
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* Marks this identifier as reachable.
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*
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* You should override this method for method identifier, which may
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* mark other methods as reachable.
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*
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* You shouldn't call this directly, but use setReachable instead.
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*/
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protected void setSingleReachable() {
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if (getParent() != null)
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getParent().setReachable();
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}
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/**
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* Mark all shadows as reachable.
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*/
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public void setReachable() {
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if (!reachable) {
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reachable = true;
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setSingleReachable();
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}
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}
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/**
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* Mark all shadows as preserved.
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*/
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public void setPreserved() {
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if (!preserved) {
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preserved = true;
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Identifier ptr = this;
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while (ptr != null) {
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ptr.setSinglePreserved();
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ptr = ptr.left;
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}
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ptr = right;
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while (ptr != null) {
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ptr.setSinglePreserved();
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ptr = ptr.right;
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}
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}
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}
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public Identifier getRepresentative() {
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Identifier ptr = this;
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while (ptr.left != null)
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ptr = ptr.left;
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return ptr;
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}
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public final boolean isRepresentative() {
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return left == null;
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}
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public final void setAlias(String name) {
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if (name != null)
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getRepresentative().alias = name;
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}
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public final String getAlias() {
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return getRepresentative().alias;
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}
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/**
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* Mark that this identifier and the given identifier must always have
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* the same name.
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*/
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public void addShadow(Identifier orig) {
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if (isPreserved() && !orig.isPreserved())
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orig.setPreserved();
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else if (!isPreserved() && orig.isPreserved())
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setPreserved();
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Identifier ptr = this;
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while (ptr.right != null)
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ptr = ptr.right;
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/* Check if orig is already on the ptr chain */
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Identifier check = orig;
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while (check.right != null)
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check = check.right;
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if (check == ptr)
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return;
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while (orig.left != null)
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orig = orig.left;
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ptr.right = orig;
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orig.left = ptr;
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}
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static int serialnr = 0;
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public void buildTable(int renameRule) {
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if (isPreserved()) {
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if (GlobalOptions.verboseLevel > 4)
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GlobalOptions.err.println(toString() + " is preserved");
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} else if (renameRule != Obfuscator.RENAME_NONE) {
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Identifier rep = getRepresentative();
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if (rep.wasAliased)
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return;
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rep.wasAliased = true;
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if (renameRule == Obfuscator.RENAME_UNIQUE)
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rep.setAlias("xxx" + serialnr++);
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else {
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StringBuffer newAlias = new StringBuffer();
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next_alias:
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for (;;) {
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okay:
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do {
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for (int pos = 0; pos < newAlias.length(); pos++) {
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char c = newAlias.charAt(pos);
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if (renameRule == Obfuscator.RENAME_WEAK) {
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if (c == '9') {
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newAlias.setCharAt(pos, 'A');
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break okay;
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} else if (c == 'Z') {
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newAlias.setCharAt(pos, 'a');
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break okay;
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} else if (c != 'z') {
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newAlias.setCharAt(pos, (char)(c+1));
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break okay;
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}
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newAlias.setCharAt(pos, pos == 0 ? 'A': '0');
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} else {
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while (c++ < 126) {
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if (Character.isJavaIdentifierPart(c)) {
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newAlias.setCharAt(pos, c);
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break okay;
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}
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}
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newAlias.setCharAt(pos, '0');
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}
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}
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newAlias.append(renameRule == Obfuscator.RENAME_WEAK
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&& newAlias.length() == 0 ? "A": "0");
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} while (false);
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Identifier ptr = rep;
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while (ptr != null) {
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if (ptr.conflicting(newAlias.toString(),
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renameRule
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== Obfuscator.RENAME_STRONG))
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continue next_alias;
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ptr = ptr.right;
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}
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setAlias(newAlias.toString());
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return;
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}
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}
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}
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}
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public void writeTable(Hashtable table) {
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table.put(getFullAlias(), getName());
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}
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public void readTable(Hashtable table) {
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Identifier rep = getRepresentative();
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if (!rep.wasAliased) {
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String newAlias = (String) table.get(getFullName());
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if (newAlias != null) {
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rep.wasAliased = true;
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rep.setAlias(newAlias);
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}
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}
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}
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public abstract void applyPreserveRule(int preserveRule);
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public abstract Identifier getParent();
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public abstract String getName();
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public abstract String getType();
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public abstract String getFullName();
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public abstract String getFullAlias();
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public abstract boolean conflicting(String newAlias, boolean strong);
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/**
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* This is called by ClassBundle when it a class is added with
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* ClassBundle.analyzeIdentifier().
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*/
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public void analyze() {
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}
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}
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