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