/*
* eXist Open Source Native XML Database
* Copyright (C) 2001-2007 The eXist Project
* http://exist-db.org
*
* This program 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
* of the License, or (at your option) any later version.
*
* This program 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 program; if not, write to the Free Software Foundation
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $Id$
*/
package org.exist.xquery.value;
import java.math.BigDecimal;
import java.text.Collator;
import org.exist.util.FastStringBuffer;
import org.exist.util.FloatingPointConverter;
import org.exist.xquery.Constants;
import org.exist.xquery.XPathException;
public class DoubleValue extends NumericValue {
// m × 2^e, where m is an integer whose absolute value is less than 2^53,
// and e is an integer between -1075 and 970, inclusive.
// In addition also -INF, +INF and NaN.
public final static DoubleValue ZERO = new DoubleValue(0.0E0);
public final static DoubleValue POSITIVE_INFINITY = new DoubleValue(Double.POSITIVE_INFINITY);
public final static DoubleValue NEGATIVE_INFINITY = new DoubleValue(Double.NEGATIVE_INFINITY);
public final static DoubleValue NaN = new DoubleValue(Double.NaN);
private double value;
public DoubleValue(double value) {
this.value = value;
}
public DoubleValue(AtomicValue otherValue) throws XPathException {
try {
if (otherValue.getStringValue().equals("INF"))
value = Double.POSITIVE_INFINITY;
else if (otherValue.getStringValue().equals("-INF"))
value = Double.NEGATIVE_INFINITY;
else if (otherValue.getStringValue().equals("NaN"))
value = Double.NaN;
else
value = Double.parseDouble(otherValue.getStringValue());
} catch (NumberFormatException e) {
throw new XPathException("FORG0001: cannot construct " + Type.getTypeName(this.getItemType()) +
" from '" + Type.getTypeName(otherValue.getItemType()) + "(\"" +
otherValue.getStringValue() + "\")'");
}
}
/* (non-Javadoc)
* @see org.exist.xquery.value.AtomicValue#getType()
*/
public int getType() {
return Type.DOUBLE;
}
public String getStringValue() {
FastStringBuffer sb = new FastStringBuffer(20);
//0 is a dummy parameter
FloatingPointConverter.appendDouble(sb, value).getNormalizedString(0);
return sb.toString();
}
public double getValue() {
return value;
}
public boolean hasFractionalPart() {
if (isNaN())
return false;
if (isInfinite())
return false;
return new DecimalValue(new BigDecimal(value)).hasFractionalPart();
};
public Item itemAt(int pos) {
return pos == 0 ? this : null;
}
/* (non-Javadoc)
* @see org.exist.xquery.value.NumericValue#isNaN()
*/
public boolean isNaN() {
return Double.isNaN(value);
}
public boolean isInfinite() {
return Double.isInfinite(value);
}
public boolean isZero() {
return Double.compare(Math.abs(value), 0.0) == Constants.EQUAL;
}
public boolean isNegative() {
return (Double.compare(value, 0.0) < Constants.EQUAL);
}
public boolean isPositive() {
return (Double.compare(value, 0.0) > Constants.EQUAL);
}
/* (non-Javadoc)
* @see org.exist.xquery.value.AtomicValue#convertTo(int)
*/
public AtomicValue convertTo(int requiredType) throws XPathException {
switch (requiredType) {
case Type.ATOMIC :
case Type.ITEM :
case Type.NUMBER :
case Type.DOUBLE :
return this;
case Type.FLOAT :
//if (Float.compare(value, 0.0f) && (value < Float.MIN_VALUE || value > Float.MAX_VALUE)
// throw new XPathException("Value is out of range for type xs:float");
//return new FloatValue((float) value);
return new FloatValue(new Float(value).floatValue());
case Type.UNTYPED_ATOMIC :
return new UntypedAtomicValue(getStringValue());
case Type.STRING :
return new StringValue(getStringValue());
case Type.DECIMAL :
if (isNaN())
throw new XPathException("FORG0001: can not convert "
+ Type.getTypeName(getType())
+ "('"
+ getStringValue()
+ "') to "
+ Type.getTypeName(requiredType));
if (isInfinite())
throw new XPathException("FORG0001: can not convert "
+ Type.getTypeName(getType())
+ "('" + getStringValue()
+ "') to "
+ Type.getTypeName(requiredType));
return new DecimalValue(new BigDecimal(value));
case Type.INTEGER :
case Type.NON_POSITIVE_INTEGER :
case Type.NEGATIVE_INTEGER :
case Type.LONG :
case Type.INT :
case Type.SHORT :
case Type.BYTE :
case Type.NON_NEGATIVE_INTEGER :
case Type.UNSIGNED_LONG :
case Type.UNSIGNED_INT :
case Type.UNSIGNED_SHORT :
case Type.UNSIGNED_BYTE :
case Type.POSITIVE_INTEGER :
if (isNaN())
throw new XPathException("FORG0001: can not convert "
+ Type.getTypeName(getType())
+ "('" + getStringValue()
+ "') to "
+ Type.getTypeName(requiredType));
if (Double.isInfinite(value))
throw new XPathException("FORG0001: can not convert "
+ Type.getTypeName(getType())
+ "('"
+ getStringValue()
+ "') to "
+ Type.getTypeName(requiredType));
if (value > Integer.MAX_VALUE)
throw new XPathException("err:FOCA0003: Value is out of range for type xs:integer");
return new IntegerValue((long) value, requiredType);
case Type.BOOLEAN :
return new BooleanValue(this.effectiveBooleanValue());
default :
throw new XPathException("FORG0001: cannot cast '"
+ Type.getTypeName(this.getItemType())
+ "(\""
+ getStringValue()
+ "\")' to "
+ Type.getTypeName(requiredType));
}
}
/* (non-Javadoc)
* @see org.exist.xquery.value.NumericValue#getDouble()
*/
public double getDouble() throws XPathException {
return value;
}
/* (non-Javadoc)
* @see org.exist.xquery.value.NumericValue#getInt()
*/
public int getInt() throws XPathException {
return (int) Math.round(value);
}
/* (non-Javadoc)
* @see org.exist.xquery.value.NumericValue#getLong()
*/
public long getLong() throws XPathException {
return (long) Math.round(value);
}
public void setValue(double val) {
value = val;
}
/* (non-Javadoc)
* @see org.exist.xquery.value.NumericValue#ceiling()
*/
public NumericValue ceiling() throws XPathException {
return new DoubleValue(Math.ceil(value));
}
/* (non-Javadoc)
* @see org.exist.xquery.value.NumericValue#floor()
*/
public NumericValue floor() throws XPathException {
return new DoubleValue(Math.floor(value));
}
/* (non-Javadoc)
* @see org.exist.xquery.value.NumericValue#round()
*/
public NumericValue round() throws XPathException {
//Copied from Saxon
if (Double.isNaN(value)) {
return this;
}
if (Double.isInfinite(value)) {
return this;
}
if (value == 0.0) {
return this; // handles the negative zero case
}
if (value > -0.5 && value < 0.0) {
return new DoubleValue(-0.0);
}
if (value > Long.MIN_VALUE && value < Long.MAX_VALUE) {
return new DoubleValue(Math.round(value));
}
// A double holds fewer significant digits than a long. Therefore,
// if the double is outside the range of a long, it cannot have
// any signficant digits after the decimal point. So in this
// case, we return the original value unchanged
return this;
}
/* (non-Javadoc)
* @see org.exist.xquery.value.NumericValue#round(org.exist.xquery.value.IntegerValue)
*/
public NumericValue round(IntegerValue precision) throws XPathException {
/* use the decimal rounding method */
return (DoubleValue) ((DecimalValue) convertTo(Type.DECIMAL)).round(precision).convertTo(Type.DOUBLE);
}
/* (non-Javadoc)
* @see org.exist.xquery.value.NumericValue#minus(org.exist.xquery.value.NumericValue)
*/
public ComputableValue minus(ComputableValue other) throws XPathException {
if (Type.subTypeOf(other.getType(), Type.DOUBLE))
return new DoubleValue(value - ((DoubleValue) other).value);
else
return minus((ComputableValue) other.convertTo(getType()));
}
/* (non-Javadoc)
* @see org.exist.xquery.value.NumericValue#plus(org.exist.xquery.value.NumericValue)
*/
public ComputableValue plus(ComputableValue other) throws XPathException {
if (Type.subTypeOf(other.getType(), Type.DOUBLE))
return new DoubleValue(value + ((DoubleValue) other).value);
else
return plus((ComputableValue) other.convertTo(getType()));
}
/* (non-Javadoc)
* @see org.exist.xquery.value.NumericValue#mult(org.exist.xquery.value.NumericValue)
*/
public ComputableValue mult(ComputableValue other) throws XPathException {
switch(other.getType()) {
case Type.DOUBLE:
return new DoubleValue(value * ((DoubleValue) other).value);
case Type.DAY_TIME_DURATION:
case Type.YEAR_MONTH_DURATION:
return other.mult(this);
default:
return mult((ComputableValue) other.convertTo(getType()));
}
}
/* (non-Javadoc)
* @see org.exist.xquery.value.NumericValue#div(org.exist.xquery.value.NumericValue)
*/
public ComputableValue div(ComputableValue other) throws XPathException {
if (Type.subTypeOf(other.getType(), Type.NUMBER)) {
//Positive or negative zero divided by positive or negative zero returns NaN.
if (this.isZero() && ((NumericValue)other).isZero())
return NaN;
//A negative number divided by positive zero returns -INF.
if (this.isNegative() &&
((NumericValue)other).isZero() && ((NumericValue)other).isPositive())
return NEGATIVE_INFINITY;
//A negative number divided by positive zero returns -INF.
if (this.isNegative() &&
((NumericValue)other).isZero() && ((NumericValue)other).isNegative())
return POSITIVE_INFINITY;
//Division of Positive by negative zero returns -INF and INF, respectively.
if (this.isPositive() &&
((NumericValue)other).isZero() && ((NumericValue)other).isNegative())
return NEGATIVE_INFINITY;
if (this.isPositive() &&
((NumericValue)other).isZero() && ((NumericValue)other).isPositive())
return POSITIVE_INFINITY;
//Also, INF or -INF divided by INF or -INF returns NaN.
if (this.isInfinite() && ((NumericValue)other).isInfinite())
return NaN;
}
if (Type.subTypeOf(other.getType(), Type.DOUBLE))
return new DoubleValue(value / ((DoubleValue) other).value);
else
return div((ComputableValue) other.convertTo(getType()));
}
public IntegerValue idiv(NumericValue other) throws XPathException {
ComputableValue result = div(other);
return new IntegerValue(((IntegerValue)result.convertTo(Type.INTEGER)).getLong());
/*
if (Type.subTypeOf(other.getType(), Type.DOUBLE)) {
double result = value / ((DoubleValue) other).value;
if (result == Double.NaN || result == Double.POSITIVE_INFINITY || result == Double.NEGATIVE_INFINITY)
throw new XPathException("illegal arguments to idiv");
return new IntegerValue(new BigDecimal(result).toBigInteger(), Type.INTEGER);
}
throw new XPathException("idiv called with incompatible argument type: " + getType() + " vs " + other.getType());
*/
}
/* (non-Javadoc)
* @see org.exist.xquery.value.NumericValue#mod(org.exist.xquery.value.NumericValue)
*/
public NumericValue mod(NumericValue other) throws XPathException {
if (Type.subTypeOf(other.getType(), Type.DOUBLE))
return new DoubleValue(value % ((DoubleValue) other).value);
else
return mod((NumericValue) other.convertTo(getType()));
}
/* (non-Javadoc)
* @see org.exist.xquery.value.NumericValue#negate()
*/
public NumericValue negate() throws XPathException {
return new DoubleValue(-value);
}
/* (non-Javadoc)
* @see org.exist.xquery.value.NumericValue#abs()
*/
public NumericValue abs() throws XPathException {
return new DoubleValue(Math.abs(value));
}
/* (non-Javadoc)
* @see org.exist.xquery.value.NumericValue#max(org.exist.xquery.value.AtomicValue)
*/
public AtomicValue max(Collator collator, AtomicValue other) throws XPathException {
if (Type.subTypeOf(other.getType(), Type.DOUBLE))
return new DoubleValue(Math.max(value, ((DoubleValue) other).value));
else
return new DoubleValue(
Math.max(value, ((DoubleValue) other.convertTo(Type.DOUBLE)).value));
}
public AtomicValue min(Collator collator, AtomicValue other) throws XPathException {
if (Type.subTypeOf(other.getType(), Type.DOUBLE))
return new DoubleValue(Math.min(value, ((DoubleValue) other).value));
else
return new DoubleValue(
Math.min(value, ((DoubleValue) other.convertTo(Type.DOUBLE)).value));
}
/* (non-Javadoc)
* @see org.exist.xquery.value.Item#conversionPreference(java.lang.Class)
*/
public int conversionPreference(Class javaClass) {
if (javaClass.isAssignableFrom(DoubleValue.class))
return 0;
if (javaClass == Long.class || javaClass == long.class)
return 3;
if (javaClass == Integer.class || javaClass == int.class)
return 4;
if (javaClass == Short.class || javaClass == short.class)
return 5;
if (javaClass == Byte.class || javaClass == byte.class)
return 6;
if (javaClass == Double.class || javaClass == double.class)
return 1;
if (javaClass == Float.class || javaClass == float.class)
return 2;
if (javaClass == String.class)
return 7;
if (javaClass == Boolean.class || javaClass == boolean.class)
return 8;
if (javaClass == Object.class)
return 20;
return Integer.MAX_VALUE;
}
/* (non-Javadoc)
* @see org.exist.xquery.value.Item#toJavaObject(java.lang.Class)
*/
public Object toJavaObject(Class target) throws XPathException {
if (target.isAssignableFrom(DoubleValue.class))
return this;
else if (target == Double.class || target == double.class)
return new Double(value);
else if (target == Float.class || target == float.class)
return new Float(value);
else if (target == Long.class || target == long.class) {
return new Long( ((IntegerValue) convertTo(Type.LONG)).getValue() );
} else if (target == Integer.class || target == int.class) {
IntegerValue v = (IntegerValue) convertTo(Type.INT);
return new Integer((int) v.getValue());
} else if (target == Short.class || target == short.class) {
IntegerValue v = (IntegerValue) convertTo(Type.SHORT);
return new Short((short) v.getValue());
} else if (target == Byte.class || target == byte.class) {
IntegerValue v = (IntegerValue) convertTo(Type.BYTE);
return new Byte((byte) v.getValue());
} else if (target == String.class)
return getStringValue();
else if (target == Boolean.class)
return Boolean.valueOf(effectiveBooleanValue());
throw new XPathException(
"cannot convert value of type "
+ Type.getTypeName(getType())
+ " to Java object of type "
+ target.getName());
}
/** size writen by {link #serialize(short, boolean)} */
public int getSerializedSize() {
return 1 + 8;
}
/* (non-Javadoc)
* @see java.lang.Comparable#compareTo(java.lang.Object)
*/
public int compareTo(Object o) {
final AtomicValue other = (AtomicValue)o;
if(Type.subTypeOf(other.getType(), Type.DOUBLE))
return Double.compare(value, ((DoubleValue)other).value);
else
return getType() < other.getType() ? Constants.INFERIOR : Constants.SUPERIOR;
}
}