253 lines
7.8 KiB
Java
253 lines
7.8 KiB
Java
/***
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* ASM: a very small and fast Java bytecode manipulation framework
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* Copyright (c) 2000-2005 INRIA, France Telecom
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package org.objectweb.asm;
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/**
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* A constant pool item. Constant pool items can be created with the 'newXXX'
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* methods in the {@link ClassWriter} class.
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*
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* @author Eric Bruneton
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*/
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final class Item {
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/**
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* Index of this item in the constant pool.
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*/
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int index;
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/**
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* Type of this constant pool item. A single class is used to represent all
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* constant pool item types, in order to minimize the bytecode size of this
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* package. The value of this field is one of {@link ClassWriter#INT},
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* {@link ClassWriter#LONG}, {@link ClassWriter#FLOAT},
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* {@link ClassWriter#DOUBLE}, {@link ClassWriter#UTF8},
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* {@link ClassWriter#STR}, {@link ClassWriter#CLASS},
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* {@link ClassWriter#NAME_TYPE}, {@link ClassWriter#FIELD},
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* {@link ClassWriter#METH}, {@link ClassWriter#IMETH}.
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*/
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int type;
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/**
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* Value of this item, for an integer item.
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*/
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int intVal;
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/**
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* Value of this item, for a long item.
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*/
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long longVal;
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/**
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* Value of this item, for a float item.
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*/
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float floatVal;
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/**
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* Value of this item, for a double item.
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*/
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double doubleVal;
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/**
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* First part of the value of this item, for items that do not hold a
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* primitive value.
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*/
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String strVal1;
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/**
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* Second part of the value of this item, for items that do not hold a
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* primitive value.
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*/
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String strVal2;
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/**
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* Third part of the value of this item, for items that do not hold a
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* primitive value.
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*/
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String strVal3;
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/**
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* The hash code value of this constant pool item.
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*/
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int hashCode;
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/**
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* Link to another constant pool item, used for collision lists in the
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* constant pool's hash table.
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*/
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Item next;
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/**
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* Constructs an uninitialized {@link Item}.
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*/
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Item() {
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}
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Item(int index) {
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this.index = index;
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}
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/**
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* Constructs a copy of the given item.
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*
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* @param index index of the item to be constructed.
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* @param i the item that must be copied into the item to be constructed.
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*/
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Item(final int index, final Item i) {
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this.index = index;
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type = i.type;
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intVal = i.intVal;
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longVal = i.longVal;
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floatVal = i.floatVal;
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doubleVal = i.doubleVal;
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strVal1 = i.strVal1;
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strVal2 = i.strVal2;
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strVal3 = i.strVal3;
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hashCode = i.hashCode;
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}
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/**
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* Sets this item to an integer item.
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*
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* @param intVal the value of this item.
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*/
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void set(final int intVal) {
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this.type = ClassWriter.INT;
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this.intVal = intVal;
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this.hashCode = 0x7FFFFFFF & (type + intVal);
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}
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/**
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* Sets this item to a long item.
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*
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* @param longVal the value of this item.
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*/
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void set(final long longVal) {
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this.type = ClassWriter.LONG;
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this.longVal = longVal;
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this.hashCode = 0x7FFFFFFF & (type + (int) longVal);
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}
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/**
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* Sets this item to a float item.
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*
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* @param floatVal the value of this item.
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*/
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void set(final float floatVal) {
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this.type = ClassWriter.FLOAT;
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this.floatVal = floatVal;
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this.hashCode = 0x7FFFFFFF & (type + (int) floatVal);
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}
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/**
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* Sets this item to a double item.
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*
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* @param doubleVal the value of this item.
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*/
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void set(final double doubleVal) {
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this.type = ClassWriter.DOUBLE;
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this.doubleVal = doubleVal;
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this.hashCode = 0x7FFFFFFF & (type + (int) doubleVal);
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}
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/**
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* Sets this item to an item that do not hold a primitive value.
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*
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* @param type the type of this item.
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* @param strVal1 first part of the value of this item.
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* @param strVal2 second part of the value of this item.
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* @param strVal3 third part of the value of this item.
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*/
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void set(
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final int type,
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final String strVal1,
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final String strVal2,
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final String strVal3)
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{
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this.type = type;
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this.strVal1 = strVal1;
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this.strVal2 = strVal2;
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this.strVal3 = strVal3;
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switch (type) {
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case ClassWriter.UTF8:
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case ClassWriter.STR:
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case ClassWriter.CLASS:
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hashCode = 0x7FFFFFFF & (type + strVal1.hashCode());
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return;
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case ClassWriter.NAME_TYPE:
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hashCode = 0x7FFFFFFF & (type + strVal1.hashCode()
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* strVal2.hashCode());
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return;
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// ClassWriter.FIELD:
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// ClassWriter.METH:
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// ClassWriter.IMETH:
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default:
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hashCode = 0x7FFFFFFF & (type + strVal1.hashCode()
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* strVal2.hashCode() * strVal3.hashCode());
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}
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}
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/**
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* Indicates if the given item is equal to this one.
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*
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* @param i the item to be compared to this one.
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* @return <tt>true</tt> if the given item if equal to this one,
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* <tt>false</tt> otherwise.
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*/
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boolean isEqualTo(final Item i) {
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if (i.type == type) {
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switch (type) {
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case ClassWriter.INT:
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return i.intVal == intVal;
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case ClassWriter.LONG:
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return i.longVal == longVal;
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case ClassWriter.FLOAT:
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return i.floatVal == floatVal;
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case ClassWriter.DOUBLE:
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return i.doubleVal == doubleVal;
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case ClassWriter.UTF8:
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case ClassWriter.STR:
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case ClassWriter.CLASS:
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return i.strVal1.equals(strVal1);
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case ClassWriter.NAME_TYPE:
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return i.strVal1.equals(strVal1)
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&& i.strVal2.equals(strVal2);
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// ClassWriter.FIELD:
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// ClassWriter.METH:
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// ClassWriter.IMETH:
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default:
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return i.strVal1.equals(strVal1)
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&& i.strVal2.equals(strVal2)
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&& i.strVal3.equals(strVal3);
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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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