/* Copyright (C) 2004-2007 Sami Koivu
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
package net.sf.rej.java.constantpool;
import net.sf.rej.util.ByteSerializer;
/**
* <code>DoubleInfo</code> objects are double info entries in the constant
* pool.
*
* @author Sami Koivu
*/
public class DoubleInfo extends ConstantPoolInfo {
private long highBytes;
private long lowBytes;
public DoubleInfo(long highBytes, long lowBytes, ConstantPool pool) {
super(DOUBLE, pool);
this.highBytes = highBytes;
this.lowBytes = lowBytes;
}
public DoubleInfo(double value, ConstantPool pool) {
super(DOUBLE, pool);
setDoubleValue(value);
}
@Override
public String toString() {
return "(double) " + String.valueOf(getDoubleValue());
}
@Override
public byte[] getData() {
ByteSerializer ser = new ByteSerializer(true);
ser.addByte(getType());
ser.addInt(this.highBytes);
ser.addInt(this.lowBytes);
return ser.getBytes();
}
@Override
public int hashCode() {
return (int) this.highBytes + (int) this.lowBytes;
}
@Override
public boolean equals(Object other) {
if (other != null && other instanceof DoubleInfo) {
return this.lowBytes == ((DoubleInfo) other).lowBytes && this.highBytes == ((DoubleInfo)other).highBytes;
} else {
return false;
}
}
@Override
public String getTypeString() {
return "Double constant";
}
public double getDoubleValue() {
long bits = (highBytes << 32l) + lowBytes;
return Double.longBitsToDouble(bits);
/* old, 'manual' implementation - has some problems
long s = ((bits >> 63) == 0) ? 1 : -1;
long e = (int) ((bits >> 52) & 0x7ffL);
long m = (e == 0) ? (bits & 0xfffffffffffffL) << 1
: (bits & 0xfffffffffffffL) | 0x10000000000000L;
// value = s x m x 2 pow (1075-e)
double value = (s * m) * Math.pow(2, e - 1075);
return value;
*/
}
public void setDoubleValue(double newValue) {
long raw = Double.doubleToRawLongBits(newValue);
this.lowBytes = raw & 0xFFFFFFFFl;
this.highBytes = raw >> 32;
}
public long getLowBytes() {
return this.lowBytes;
}
public long getHighBytes() {
return this.highBytes;
}
}