/*
* 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 short numbers.
*/
@Immutable
public class ShortOperations implements MathOperations<Short>, Comparator<Short> {
@Override
public Class<Short> getOperandClass() {
return Short.class;
}
@Override
public Short add( Short value1,
Short value2 ) {
if (value1 == null) return value2 != null ? value2 : createZeroValue();
if (value2 == null) return value1;
return (short)(value1 + value2);
}
@Override
public Short subtract( Short value1,
Short value2 ) {
if (value1 == null) return negate(value2);
if (value2 == null) return value1;
return (short)(value1 - value2);
}
@Override
public Short multiply( Short value1,
Short value2 ) {
if (value1 == null || value2 == null) return createZeroValue();
return (short)(value1 * value2);
}
@Override
public double divide( Short value1,
Short value2 ) {
if (value1 == null || value2 == null) throw new IllegalArgumentException();
return value1 / value2;
}
@Override
public Short negate( Short value ) {
if (value == null) return createZeroValue();
return (short)(value * -1);
}
@Override
public Short increment( Short value ) {
if (value == null) return createZeroValue();
return (short)(value + 1);
}
@Override
public Short maximum( Short value1,
Short value2 ) {
if (value1 == null) return value2;
if (value2 == null) return value1;
return (short)Math.max(value1, value2);
}
@Override
public Short minimum( Short value1,
Short value2 ) {
if (value1 == null) return value2;
if (value2 == null) return value1;
return (short)Math.min(value1, value2);
}
@Override
public int compare( Short value1,
Short value2 ) {
if (value1 == null) return value2 != null ? -1 : 0;
if (value2 == null) return 1;
return value1.compareTo(value2);
}
@Override
public BigDecimal asBigDecimal( Short value ) {
return value != null ? new BigDecimal(value) : null;
}
@Override
public Short fromBigDecimal( BigDecimal value ) {
return value != null ? value.shortValue() : null;
}
@Override
public Short createZeroValue() {
return 0;
}
@Override
public Short create( int value ) {
return (short)value;
}
@Override
public Short create( long value ) {
return (short)value;
}
@Override
public Short create( double value ) {
return (short)value;
}
@Override
public double sqrt( Short value ) {
return Math.sqrt(value);
}
@Override
public Comparator<Short> getComparator() {
return this;
}
@Override
public Short random( Short minimum,
Short maximum,
Random rng ) {
Short difference = subtract(maximum, minimum);
int increment = rng.nextInt(difference.intValue());
return new Integer(minimum + increment).shortValue();
}
@Override
public double doubleValue( Short value ) {
return value.doubleValue();
}
@Override
public float floatValue( Short value ) {
return value.floatValue();
}
@Override
public int intValue( Short value ) {
return value.intValue();
}
@Override
public long longValue( Short value ) {
return value.longValue();
}
@Override
public short shortValue( Short value ) {
return value.shortValue();
}
@Override
public int getExponentInScientificNotation( Short value ) {
int v = Math.abs(value);
int exp = 0;
if (v > 1) {
while (v >= 10) {
v /= 10;
++exp;
}
} else if (v < 1) {
while (v < 1) {
v *= 10;
--exp;
}
}
return exp;
}
@Override
public Short roundUp( Short value,
int decimalShift ) {
if (value == 0) return 0;
if (decimalShift >= 0) return value;
int shiftedValueP5 = Math.abs(value);
for (int i = 0; i != (-decimalShift - 1); ++i)
shiftedValueP5 /= 10;
shiftedValueP5 += 5l;
int shiftedValue = shiftedValueP5 / 10;
if (shiftedValue * 10l - shiftedValueP5 >= 5) ++shiftedValue;
shiftedValue *= Long.signum(value);
for (int i = 0; i != -decimalShift; ++i)
shiftedValue *= 10;
return (short)shiftedValue;
}
@Override
public Short roundDown( Short value,
int decimalShift ) {
if (value == 0) return 0;
if (decimalShift >= 0) return value;
int shiftedValue = Math.abs(value);
for (int i = 0; i != -decimalShift; ++i)
shiftedValue /= 10;
shiftedValue *= Long.signum(value);
for (int i = 0; i != -decimalShift; ++i)
shiftedValue *= 10;
return (short)shiftedValue;
}
@Override
public Short keepSignificantFigures( Short value,
int numSigFigs ) {
if (numSigFigs < 0) return value;
if (numSigFigs == 0) return 0;
int currentExp = getExponentInScientificNotation(value);
int decimalShift = -currentExp + numSigFigs - 1;
return roundUp(value, decimalShift);
}
}