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