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462 lines
16 KiB
462 lines
16 KiB
/* ClassInterfacesType 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;
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import jode.bytecode.ClassInfo;
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import java.util.Vector;
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import java.util.Stack;
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/**
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* This class represents a type aproximation, consisting of multiple
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* interfaces and a class type.<p>
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*
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* If this is the bottom boundary, this specifies, which class our
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* type must extend and which interfaces it must implement.
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*
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* If this is the top boundary, this gives all interfaces and classes
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* that may extend the type. I.e. at least one interface or class extends
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* the searched type.
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*
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* @author Jochen Hoenicke */
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public class ClassInterfacesType extends Type {
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ClassInfo clazz;
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ClassInfo ifaces[];
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public ClassInfo getClazz() {
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return clazz != null ? clazz : ClassInfo.javaLangObject;
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}
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public ClassInterfacesType(String clazzName) {
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super(TC_CLASS);
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ClassInfo clazz = ClassInfo.forName(clazzName);
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if (clazz.isInterface()) {
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this.clazz = null;
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ifaces = new ClassInfo[] {clazz};
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} else {
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this.clazz =
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(clazz == ClassInfo.javaLangObject) ? null : clazz;
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ifaces = new ClassInfo[0];
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}
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}
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public ClassInterfacesType(ClassInfo clazz) {
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super(TC_CLASS);
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if (clazz.isInterface()) {
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this.clazz = null;
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ifaces = new ClassInfo[] { clazz };
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} else {
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this.clazz =
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(clazz == ClassInfo.javaLangObject) ? null : clazz;
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ifaces = new ClassInfo[0];
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}
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}
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public ClassInterfacesType(ClassInfo clazz, ClassInfo[] ifaces) {
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super(TC_CLASS);
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this.clazz = clazz;
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this.ifaces = ifaces;
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}
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private static Type create(ClassInfo clazz, ClassInfo[] ifaces) {
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/* Make sure that every {java.lang.Object} equals tObject */
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if (ifaces.length == 0 && clazz == null)
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return tObject;
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return new ClassInterfacesType(clazz, ifaces);
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}
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/**
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* Create the type corresponding to the range from bottomType to
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* this. Checks if the given type range may be not empty. This
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* means, that bottom.clazz is extended by this.clazz and that all
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* interfaces in bottom are implemented by an interface or by
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* clazz.
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* @param bottom the start point of the range
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* @return the range type, or tError if range is empty.
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*/
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public Type createRangeType(Type bottomType) {
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if (bottomType == tUnknown || bottomType == tObject)
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return (this == tObject) ? tObject : tRange(tObject, this);
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if (bottomType.typecode != TC_CLASS)
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return tError;
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ClassInterfacesType bottom = (ClassInterfacesType) bottomType;
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if (bottom.clazz != null) {
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/* The searched type must be a class type.
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*/
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if (this.ifaces.length != 0
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|| !bottom.clazz.superClassOf(this.clazz))
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return tError;
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/* All interfaces must be implemented by this.clazz
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*/
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for (int i=0; i < bottom.ifaces.length; i++) {
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if (!bottom.ifaces[i].implementedBy(this.clazz))
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return tError;
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}
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if (bottom.clazz == this.clazz
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&& bottom.ifaces.length == 0)
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return bottom;
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return tRange(bottom, this);
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} else {
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/* Now bottom.clazz is null (or tObject), find all
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* classes/interfaces that implement all bottom.ifaces.
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*/
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ClassInfo clazz = this.clazz;
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if (clazz != null) {
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for (int i=0; i < bottom.ifaces.length; i++) {
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if (!bottom.ifaces[i].implementedBy(clazz)) {
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clazz = null;
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break;
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}
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}
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}
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/* If bottom is a single interface and equals some top
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* interface, then bottom is the only possible type.
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*/
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if (clazz == null && bottom.ifaces.length == 1) {
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for (int i=0; i< this.ifaces.length; i++) {
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if (this.ifaces[i] == bottom.ifaces[0])
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return bottom;
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}
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}
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ClassInfo[] ifaces = new ClassInfo[this.ifaces.length];
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int count = 0;
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big_loop:
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for (int j=0; j < this.ifaces.length; j++) {
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for (int i=0; i < bottom.ifaces.length; i++) {
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if (!bottom.ifaces[i].implementedBy(this.ifaces[j]))
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continue big_loop;
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}
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ifaces[count++] = (this.ifaces[j]);
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}
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if (clazz == null && count == 0) {
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/* There are no more possible interfaces or classes left.
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* This is a type error.
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*/
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return tError;
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} else if (count < ifaces.length) {
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ClassInfo[] shortIfaces = new ClassInfo[count];
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System.arraycopy(ifaces, 0, shortIfaces, 0, count);
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ifaces = shortIfaces;
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} else if (clazz == this.clazz)
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return tRange(bottom, this);
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return tRange(bottom, create(clazz, ifaces));
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}
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}
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private boolean implementsAllIfaces(ClassInfo[] otherIfaces) {
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big:
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for (int i=0; i < otherIfaces.length; i++) {
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ClassInfo iface = otherIfaces[i];
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if (clazz != null && iface.implementedBy(clazz))
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continue big;
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for (int j=0; j < this.ifaces.length; j++) {
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if (iface.implementedBy(ifaces[j]))
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continue big;
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}
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return false;
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}
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return true;
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}
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/**
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* Returns the specialized type of this and type.
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* We have two classes and multiple interfaces. The result
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* should be the object that extends both objects
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* and the union of all interfaces.
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*/
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public Type getSpecializedType(Type type) {
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int code = type.typecode;
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if (code == TC_UNKNOWN)
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return this;
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if ((code == TC_ARRAY || code == TC_UCLASS) && this == tObject)
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return type;
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if (code != TC_CLASS)
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return tError;
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ClassInterfacesType other = (ClassInterfacesType) type;
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ClassInfo clazz;
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/* First determine the clazz, one of the two classes must be a sub
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* class of the other or null.
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*/
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if (this.clazz == null)
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clazz = other.clazz;
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else if (other.clazz == null)
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clazz = this.clazz;
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else if (this.clazz.superClassOf(other.clazz))
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clazz = other.clazz;
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else if (other.clazz.superClassOf(this.clazz))
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clazz = this.clazz;
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else
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return tError;
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/* Most time one of the two classes is already more specialized.
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* Optimize for this case.
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*/
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if (clazz == this.clazz
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&& implementsAllIfaces(other.ifaces))
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return this;
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else if (clazz == other.clazz
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&& other.implementsAllIfaces(this.ifaces))
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return other;
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/* The interfaces are simply the union of both interfaces set.
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* But we can simplify this, if an interface is implemented by
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* another or by the class, we can omit it.
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*/
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Vector ifaces = new Vector();
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big_loop_this:
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for (int i=0; i< this.ifaces.length; i++) {
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ClassInfo iface = this.ifaces[i];
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if (clazz != null && iface.implementedBy(clazz)) {
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continue big_loop_this;
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}
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for (int j=0; j<other.ifaces.length; j++) {
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if (iface.implementedBy(other.ifaces[j])) {
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continue big_loop_this;
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}
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}
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/* This interface is not implemented by any of the other
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* ifaces. Add it to the interfaces vector.
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*/
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ifaces.addElement(iface);
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}
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big_loop_other:
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for (int i=0; i< other.ifaces.length; i++) {
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ClassInfo iface = other.ifaces[i];
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if (clazz != null && iface.implementedBy(clazz)) {
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continue big_loop_other;
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}
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for (int j=0; j<ifaces.size(); j++) {
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if (iface.implementedBy((ClassInfo)
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ifaces.elementAt(j))) {
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continue big_loop_other;
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}
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}
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/* This interface is not implemented by any of the other
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* ifaces. Add it to the interfaces vector.
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*/
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ifaces.addElement(iface);
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}
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ClassInfo[] ifaceArray = new ClassInfo[ifaces.size()];
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ifaces.copyInto(ifaceArray);
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return create(clazz, ifaceArray);
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}
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/**
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* Returns the generalized type of this and type. We have two
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* classes and multiple interfaces. The result should be the
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* object that is the the super class of both objects and all
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* interfaces, that one class or interface of each type
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* implements. */
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public Type getGeneralizedType(Type type) {
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int code = type.typecode;
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if (code == TC_UNKNOWN)
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return this;
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if (code == TC_ARRAY || code == TC_UCLASS)
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return tObject;
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if (code != TC_CLASS)
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return tError;
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ClassInterfacesType other = (ClassInterfacesType) type;
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ClassInfo clazz;
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/* First the easy part, determine the clazz */
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if (this.clazz == null || other.clazz == null)
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clazz = null;
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else {
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clazz = this.clazz;
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while(clazz != null) {
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if (clazz.superClassOf(other.clazz))
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break;
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clazz = clazz.getSuperclass();
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}
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if (clazz == ClassInfo.javaLangObject)
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clazz = null;
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}
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if (clazz == this.clazz
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&& other.implementsAllIfaces(this.ifaces))
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return this;
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else if (clazz == other.clazz
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&& this.implementsAllIfaces(other.ifaces))
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return other;
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/* Now the more complicated part: find all interfaces, that are
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* implemented by one interface or class in each group.
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*
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* First get all interfaces of this.clazz and this.ifaces.
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*/
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Stack allIfaces = new Stack();
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if (this.clazz != null) {
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ClassInfo c = this.clazz;
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while (clazz != c) {
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ClassInfo clazzIfaces[] = c.getInterfaces();
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for (int i=0; i<clazzIfaces.length; i++)
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allIfaces.push(clazzIfaces[i]);
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c = c.getSuperclass();
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}
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}
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Vector ifaces = new Vector();
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for (int i=0; i<this.ifaces.length; i++)
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allIfaces.push(this.ifaces[i]);
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/* Now consider each interface. If any clazz or interface
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* in other implements it, add it to the ifaces vector.
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* Otherwise consider all sub interfaces.
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*/
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iface_loop:
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while (!allIfaces.isEmpty()) {
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ClassInfo iface = (ClassInfo) allIfaces.pop();
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if ((clazz != null && iface.implementedBy(clazz))
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|| ifaces.contains(iface))
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/* We can skip this, as clazz or ifaces already imply it.
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*/
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continue iface_loop;
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if (other.clazz != null && iface.implementedBy(other.clazz)) {
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ifaces.addElement(iface);
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continue iface_loop;
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}
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for (int i=0; i<other.ifaces.length; i++) {
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if (iface.implementedBy(other.ifaces[i])) {
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ifaces.addElement(iface);
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continue iface_loop;
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}
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}
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/* This interface is not implemented by any of the other
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* ifaces. Try its parent interfaces now.
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*/
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ClassInfo clazzIfaces[] = iface.getInterfaces();
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for (int i=0; i<clazzIfaces.length; i++)
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allIfaces.push(clazzIfaces[i]);
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}
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ClassInfo[] ifaceArray = new ClassInfo[ifaces.size()];
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ifaces.copyInto(ifaceArray);
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return create(clazz, ifaceArray);
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}
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/**
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* Marks this type as used, so that the class is imported.
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*/
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public void useType() {
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if (!jode.Decompiler.isTypeDebugging) {
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if (clazz != null)
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env.useClass(clazz.getName());
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else if (ifaces.length > 0)
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env.useClass(ifaces[0].getName());
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}
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}
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public String toString()
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{
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if (jode.Decompiler.isTypeDebugging) {
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if (this == tObject)
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return "java.lang.Object";
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if (ifaces.length == 0)
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return clazz.getName();
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if (clazz == null && ifaces.length == 1)
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return ifaces[0].getName();
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StringBuffer sb = new StringBuffer("{");
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String comma = "";
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if (clazz != null) {
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sb = sb.append(clazz.getName());
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comma = ", ";
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}
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for (int i=0; i< ifaces.length; i++) {
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sb.append(comma).append(ifaces[i].getName());
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comma = ", ";
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}
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return sb.append("}").toString();
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} else {
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if (clazz != null)
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return env.classString(clazz.getName());
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else if (ifaces.length > 0)
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return env.classString(ifaces[0].getName());
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else
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return env.classString("java.lang.Object");
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}
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}
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public boolean isClassType() {
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return true;
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}
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public String getDefaultName() {
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ClassInfo type;
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if (clazz != null)
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type = clazz;
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else if (ifaces.length > 0)
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type = ifaces[0];
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else
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type = ClassInfo.javaLangObject;
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String name = type.getName();
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int dot = name.lastIndexOf('.');
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if (dot >= 0)
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name = name.substring(dot+1);
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if (Character.isUpperCase(name.charAt(0)))
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return name.toLowerCase();
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else
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return name+"_var";
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}
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public boolean equals(Object o) {
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if (o == this)
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return true;
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if (o instanceof ClassInterfacesType) {
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ClassInterfacesType type = (ClassInterfacesType) o;
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if (type.clazz == clazz
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&& type.ifaces.length == ifaces.length) {
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big_loop:
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for (int i=0; i< type.ifaces.length; i++) {
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for (int j=0; j<ifaces.length; j++) {
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if (type.ifaces[i] == ifaces[j])
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continue big_loop;
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}
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return false;
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}
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return true;
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}
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}
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return false;
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}
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}
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