/*
* ModeShape (http://www.modeshape.org)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.modeshape.common.math;
import java.math.BigDecimal;
import java.util.Comparator;
import java.util.Random;
import org.modeshape.common.annotation.Immutable;
/**
* The {@link MathOperations math operations} for double numbers.
*/
@Immutable
public class DoubleOperations implements MathOperations<Double>, Comparator<Double> {
@Override
public Class<Double> getOperandClass() {
return Double.class;
}
@Override
public Double add( Double value1,
Double value2 ) {
if (value1 == null) return value2 != null ? value2 : createZeroValue();
if (value2 == null) return value1;
return (value1 + value2);
}
@Override
public Double subtract( Double value1,
Double value2 ) {
if (value1 == null) return negate(value2);
if (value2 == null) return value1;
return (value1 - value2);
}
@Override
public Double multiply( Double value1,
Double value2 ) {
if (value1 == null || value2 == null) return createZeroValue();
return (value1 * value2);
}
@Override
public double divide( Double value1,
Double value2 ) {
if (value1 == null || value2 == null) throw new IllegalArgumentException();
return value1 / value2;
}
@Override
public Double negate( Double value ) {
if (value == null) return createZeroValue();
return (value * -1);
}
@Override
public Double increment( Double value ) {
if (value == null) return createZeroValue();
return (value + 1);
}
@Override
public Double maximum( Double value1,
Double value2 ) {
if (value1 == null) return value2;
if (value2 == null) return value1;
return Math.max(value1, value2);
}
@Override
public Double minimum( Double value1,
Double value2 ) {
if (value1 == null) return value2;
if (value2 == null) return value1;
return Math.min(value1, value2);
}
@Override
public int compare( Double value1,
Double value2 ) {
if (value1 == null) return value2 != null ? -1 : 0;
if (value2 == null) return 1;
return value1.compareTo(value2);
}
@Override
public BigDecimal asBigDecimal( Double value ) {
return value != null ? new BigDecimal(value) : null;
}
@Override
public Double fromBigDecimal( BigDecimal value ) {
return value != null ? value.doubleValue() : null;
}
@Override
public Double createZeroValue() {
return 0.0d;
}
@Override
public Double create( int value ) {
return (double)value;
}
@Override
public Double create( long value ) {
return (double)value;
}
@Override
public Double create( double value ) {
return value;
}
@Override
public double sqrt( Double value ) {
return Math.sqrt(value);
}
@Override
public Comparator<Double> getComparator() {
return this;
}
@Override
public Double random( Double minimum,
Double maximum,
Random rng ) {
Double difference = subtract(maximum, minimum);
return minimum + difference.doubleValue() * rng.nextDouble();
}
@Override
public double doubleValue( Double value ) {
return value.doubleValue();
}
@Override
public float floatValue( Double value ) {
return value.floatValue();
}
@Override
public int intValue( Double value ) {
return value.intValue();
}
@Override
public long longValue( Double value ) {
return value.longValue();
}
@Override
public short shortValue( Double value ) {
return value.shortValue();
}
@Override
public int getExponentInScientificNotation( Double value ) {
double v = Math.abs(value);
int exp = 0;
if (v > 1.0d) {
while (v >= 10.0d) {
v /= 10.0d;
++exp;
}
} else if (v == 0.0d) {
} else if (v < 1.0d) {
while (v < 1.0d) {
v *= 10.0d;
--exp;
}
}
return exp;
}
@Override
public Double roundUp( Double value,
int decimalShift ) {
if (value == 0) return 0.0d;
double shiftedValue = (Math.abs(value) * Math.pow(10.0d, decimalShift) + 0.5d) * Math.signum(value);
double roundedValue = (int)shiftedValue;
return roundedValue * Math.pow(10.0d, -decimalShift);
}
@Override
public Double roundDown( Double value,
int decimalShift ) {
if (value == 0) return 0.0d;
double shiftedValue = (Math.abs(value) * Math.pow(10.0d, decimalShift)) * Math.signum(value);
double roundedValue = (int)shiftedValue;
return roundedValue * Math.pow(10.0d, -decimalShift);
}
@Override
public Double keepSignificantFigures( Double value,
int numSigFigs ) {
if (numSigFigs < 0) return value;
if (numSigFigs == 0) return 0.0d;
int currentExp = getExponentInScientificNotation(value);
int decimalShift = -currentExp + numSigFigs - 1;
return roundUp(value, decimalShift);
}
}