/*
* 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 float numbers.
*/
@Immutable
public class FloatOperations implements MathOperations<Float>, Comparator<Float> {
@Override
public Class<Float> getOperandClass() {
return Float.class;
}
@Override
public Float add( Float value1,
Float value2 ) {
if (value1 == null) return value2 != null ? value2 : createZeroValue();
if (value2 == null) return value1;
return (value1 + value2);
}
@Override
public Float subtract( Float value1,
Float value2 ) {
if (value1 == null) return negate(value2);
if (value2 == null) return value1;
return (value1 - value2);
}
@Override
public Float multiply( Float value1,
Float value2 ) {
if (value1 == null || value2 == null) return createZeroValue();
return (value1 * value2);
}
@Override
public double divide( Float value1,
Float value2 ) {
if (value1 == null || value2 == null) throw new IllegalArgumentException();
return value1 / value2;
}
@Override
public Float negate( Float value ) {
if (value == null) return createZeroValue();
return (value * -1);
}
@Override
public Float increment( Float value ) {
if (value == null) return createZeroValue();
return (value + 1);
}
@Override
public Float maximum( Float value1,
Float value2 ) {
if (value1 == null) return value2;
if (value2 == null) return value1;
return Math.max(value1, value2);
}
@Override
public Float minimum( Float value1,
Float value2 ) {
if (value1 == null) return value2;
if (value2 == null) return value1;
return Math.min(value1, value2);
}
@Override
public int compare( Float value1,
Float value2 ) {
if (value1 == null) return value2 != null ? -1 : 0;
if (value2 == null) return 1;
return value1.compareTo(value2);
}
@Override
public BigDecimal asBigDecimal( Float value ) {
return value != null ? new BigDecimal(value) : null;
}
@Override
public Float fromBigDecimal( BigDecimal value ) {
return value != null ? value.floatValue() : null;
}
@Override
public Float createZeroValue() {
return 0.0f;
}
@Override
public Float create( int value ) {
return (float)value;
}
@Override
public Float create( long value ) {
return (float)value;
}
@Override
public Float create( double value ) {
return (float)value;
}
@Override
public double sqrt( Float value ) {
return Math.sqrt(value);
}
@Override
public Comparator<Float> getComparator() {
return this;
}
@Override
public Float random( Float minimum,
Float maximum,
Random rng ) {
Float difference = subtract(maximum, minimum);
return minimum + difference.floatValue() * rng.nextFloat();
}
@Override
public double doubleValue( Float value ) {
return value.doubleValue();
}
@Override
public float floatValue( Float value ) {
return value.floatValue();
}
@Override
public int intValue( Float value ) {
return value.intValue();
}
@Override
public long longValue( Float value ) {
return value.longValue();
}
@Override
public short shortValue( Float value ) {
return value.shortValue();
}
@Override
public int getExponentInScientificNotation( Float 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 Float roundUp( Float value,
int decimalShift ) {
if (value == 0) return 0.0f;
double shiftedValue = (Math.abs(value.doubleValue()) * Math.pow(10.0d, decimalShift) + 0.5d) * Math.signum(value);
double roundedValue = (long)shiftedValue;
return (float)(roundedValue * Math.pow(10.0d, -decimalShift));
}
@Override
public Float roundDown( Float value,
int decimalShift ) {
if (value == 0) return 0.0f;
if (decimalShift > 0) return value;
double shiftedValue = (Math.abs(value.doubleValue()) * Math.pow(10.0d, decimalShift)) * Math.signum(value);
double roundedValue = (long)shiftedValue;
return (float)(roundedValue * Math.pow(10.0d, -decimalShift));
}
@Override
public Float keepSignificantFigures( Float value,
int numSigFigs ) {
int currentExp = getExponentInScientificNotation(value);
int decimalShift = (int)Math.signum(currentExp) * (Math.abs(currentExp) + numSigFigs - 1);
return roundUp(value, decimalShift);
}
}