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/***
* ASM: a very small and fast Java bytecode manipulation framework
* Copyright (c) 2000-2005 INRIA, France Telecom
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.objectweb.asm.optimizer;
import org.objectweb.asm.ClassWriter;
/**
* A constant pool item.
*
* @author Eric Bruneton
*/
class Constant {
/**
* Type of this constant pool item. A single class is used to represent all
* constant pool item types, in order to minimize the bytecode size of this
* package. The value of this field is I, J, F, D, S, s, C, T, G, M, or N
* (for Constant Integer, Long, Float, Double, STR, UTF8, Class, NameType,
* Fieldref, Methodref, or InterfaceMethodref constant pool items
* respectively).
*/
char type;
/**
* Value of this item, for an integer item.
*/
int intVal;
/**
* Value of this item, for a long item.
*/
long longVal;
/**
* Value of this item, for a float item.
*/
float floatVal;
/**
* Value of this item, for a double item.
*/
double doubleVal;
/**
* First part of the value of this item, for items that do not hold a
* primitive value.
*/
String strVal1;
/**
* Second part of the value of this item, for items that do not hold a
* primitive value.
*/
String strVal2;
/**
* Third part of the value of this item, for items that do not hold a
* primitive value.
*/
String strVal3;
/**
* The hash code value of this constant pool item.
*/
int hashCode;
public Constant() {
}
public Constant(final Constant i) {
type = i.type;
intVal = i.intVal;
longVal = i.longVal;
floatVal = i.floatVal;
doubleVal = i.doubleVal;
strVal1 = i.strVal1;
strVal2 = i.strVal2;
strVal3 = i.strVal3;
hashCode = i.hashCode;
}
/**
* Sets this item to an integer item.
*
* @param intVal the value of this item.
*/
void set(final int intVal) {
this.type = 'I';
this.intVal = intVal;
this.hashCode = 0x7FFFFFFF & (type + intVal);
}
/**
* Sets this item to a long item.
*
* @param longVal the value of this item.
*/
void set(final long longVal) {
this.type = 'J';
this.longVal = longVal;
this.hashCode = 0x7FFFFFFF & (type + (int) longVal);
}
/**
* Sets this item to a float item.
*
* @param floatVal the value of this item.
*/
void set(final float floatVal) {
this.type = 'F';
this.floatVal = floatVal;
this.hashCode = 0x7FFFFFFF & (type + (int) floatVal);
}
/**
* Sets this item to a double item.
*
* @param doubleVal the value of this item.
*/
void set(final double doubleVal) {
this.type = 'D';
this.doubleVal = doubleVal;
this.hashCode = 0x7FFFFFFF & (type + (int) doubleVal);
}
/**
* Sets this item to an item that do not hold a primitive value.
*
* @param type the type of this item.
* @param strVal1 first part of the value of this item.
* @param strVal2 second part of the value of this item.
* @param strVal3 third part of the value of this item.
*/
void set(
final char type,
final String strVal1,
final String strVal2,
final String strVal3)
{
this.type = type;
this.strVal1 = strVal1;
this.strVal2 = strVal2;
this.strVal3 = strVal3;
switch (type) {
case 's':
case 'S':
case 'C':
hashCode = 0x7FFFFFFF & (type + strVal1.hashCode());
return;
case 'T':
hashCode = 0x7FFFFFFF & (type + strVal1.hashCode()
* strVal2.hashCode());
return;
// case 'G':
// case 'M':
// case 'N':
default:
hashCode = 0x7FFFFFFF & (type + strVal1.hashCode()
* strVal2.hashCode() * strVal3.hashCode());
}
}
void write(final ClassWriter cw) {
switch (type) {
case 'I':
cw.newConst(new Integer(intVal));
break;
case 'J':
cw.newConst(new Long(longVal));
break;
case 'F':
cw.newConst(new Float(floatVal));
break;
case 'D':
cw.newConst(new Double(doubleVal));
break;
case 'S':
cw.newConst(strVal1);
break;
case 's':
cw.newUTF8(strVal1);
break;
case 'C':
cw.newClass(strVal1);
break;
case 'T':
cw.newNameType(strVal1, strVal2);
break;
case 'G':
cw.newField(strVal1, strVal2, strVal3);
break;
case 'M':
cw.newMethod(strVal1, strVal2, strVal3, false);
break;
case 'N':
cw.newMethod(strVal1, strVal2, strVal3, true);
break;
}
}
public boolean equals(final Object o) {
if (!(o instanceof Constant)) {
return false;
}
Constant c = (Constant) o;
if (c.type == type) {
switch (type) {
case 'I':
return c.intVal == intVal;
case 'J':
return c.longVal == longVal;
case 'F':
return c.floatVal == floatVal;
case 'D':
return c.doubleVal == doubleVal;
case 's':
case 'S':
case 'C':
return c.strVal1.equals(strVal1);
case 'T':
return c.strVal1.equals(strVal1)
&& c.strVal2.equals(strVal2);
// case 'G':
// case 'M':
// case 'N':
default:
return c.strVal1.equals(strVal1)
&& c.strVal2.equals(strVal2)
&& c.strVal3.equals(strVal3);
}
}
return false;
}
public int hashCode() {
return hashCode;
}
}
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