/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.commons.math3.util;
import org.apache.commons.math3.Field;
import org.apache.commons.math3.FieldElement;
/**
* This class wraps a {@code double} value in an object. It is similar to the
* standard class {@link Double}, while also implementing the
* {@link FieldElement} interface.
*
* @since 3.1
* @version $Id: Decimal64.java 1306177 2012-03-28 05:40:46Z celestin $
*/
public class Decimal64 extends Number implements FieldElement<Decimal64>,
Comparable<Decimal64> {
/** The constant value of {@code 0d} as a {@code Decimal64}. */
public static final Decimal64 ZERO;
/** The constant value of {@code 1d} as a {@code Decimal64}. */
public static final Decimal64 ONE;
/**
* The constant value of {@link Double#NEGATIVE_INFINITY} as a
* {@code Decimal64}.
*/
public static final Decimal64 NEGATIVE_INFINITY;
/**
* The constant value of {@link Double#POSITIVE_INFINITY} as a
* {@code Decimal64}.
*/
public static final Decimal64 POSITIVE_INFINITY;
/** The constant value of {@link Double#NaN} as a {@code Decimal64}. */
public static final Decimal64 NAN;
/** */
private static final long serialVersionUID = 20120227L;
static {
ZERO = new Decimal64(0d);
ONE = new Decimal64(1d);
NEGATIVE_INFINITY = new Decimal64(Double.NEGATIVE_INFINITY);
POSITIVE_INFINITY = new Decimal64(Double.POSITIVE_INFINITY);
NAN = new Decimal64(Double.NaN);
}
/** The primitive {@code double} value of this object. */
private final double value;
/**
* Creates a new instance of this class.
*
* @param x the primitive {@code double} value of the object to be created
*/
public Decimal64(final double x) {
this.value = x;
}
/*
* Methods from the FieldElement interface.
*/
/** {@inheritDoc} */
public Field<Decimal64> getField() {
return Decimal64Field.getInstance();
}
/**
* {@inheritDoc}
*
* The current implementation strictly enforces
* {@code this.add(a).equals(new Decimal64(this.doubleValue()
* + a.doubleValue()))}.
*/
public Decimal64 add(final Decimal64 a) {
return new Decimal64(this.value + a.value);
}
/**
* {@inheritDoc}
*
* The current implementation strictly enforces
* {@code this.subtract(a).equals(new Decimal64(this.doubleValue()
* - a.doubleValue()))}.
*/
public Decimal64 subtract(final Decimal64 a) {
return new Decimal64(this.value - a.value);
}
/**
* {@inheritDoc}
*
* The current implementation strictly enforces
* {@code this.negate().equals(new Decimal64(-this.doubleValue()))}.
*/
public Decimal64 negate() {
return new Decimal64(-this.value);
}
/**
* {@inheritDoc}
*
* The current implementation strictly enforces
* {@code this.multiply(a).equals(new Decimal64(this.doubleValue()
* * a.doubleValue()))}.
*/
public Decimal64 multiply(final Decimal64 a) {
return new Decimal64(this.value * a.value);
}
/**
* {@inheritDoc}
*
* The current implementation strictly enforces
* {@code this.multiply(n).equals(new Decimal64(n * this.doubleValue()))}.
*/
public Decimal64 multiply(final int n) {
return new Decimal64(n * this.value);
}
/**
* {@inheritDoc}
*
* The current implementation strictly enforces
* {@code this.divide(a).equals(new Decimal64(this.doubleValue()
* / a.doubleValue()))}.
*
*/
public Decimal64 divide(final Decimal64 a) {
return new Decimal64(this.value / a.value);
}
/**
* {@inheritDoc}
*
* The current implementation strictly enforces
* {@code this.reciprocal().equals(new Decimal64(1.0
* / this.doubleValue()))}.
*/
public Decimal64 reciprocal() {
return new Decimal64(1.0 / this.value);
}
/*
* Methods from the Number abstract class
*/
/**
* {@inheritDoc}
*
* The current implementation performs casting to a {@code byte}.
*/
@Override
public byte byteValue() {
return (byte) value;
}
/**
* {@inheritDoc}
*
* The current implementation performs casting to a {@code short}.
*/
@Override
public short shortValue() {
return (short) value;
}
/**
* {@inheritDoc}
*
* The current implementation performs casting to a {@code int}.
*/
@Override
public int intValue() {
return (int) value;
}
/**
* {@inheritDoc}
*
* The current implementation performs casting to a {@code long}.
*/
@Override
public long longValue() {
return (long) value;
}
/**
* {@inheritDoc}
*
* The current implementation performs casting to a {@code float}.
*/
@Override
public float floatValue() {
return (float) value;
}
/** {@inheritDoc} */
@Override
public double doubleValue() {
return value;
}
/*
* Methods from the Comparable interface.
*/
/**
* {@inheritDoc}
*
* The current implementation returns the same value as
* <center> {@code new Double(this.doubleValue()).compareTo(new
* Double(o.doubleValue()))} </center>
*
* @see Double#compareTo(Double)
*/
public int compareTo(final Decimal64 o) {
return Double.compare(this.value, o.value);
}
/*
* Methods from the Object abstract class.
*/
/** {@inheritDoc} */
@Override
public boolean equals(final Object obj) {
if (obj instanceof Decimal64) {
final Decimal64 that = (Decimal64) obj;
return Double.doubleToLongBits(this.value) == Double
.doubleToLongBits(that.value);
}
return false;
}
/**
* {@inheritDoc}
*
* The current implementation returns the same value as
* {@code new Double(this.doubleValue()).hashCode()}
*
* @see Double#hashCode()
*/
@Override
public int hashCode() {
long v = Double.doubleToLongBits(value);
return (int) (v ^ (v >>> 32));
}
/**
* {@inheritDoc}
*
* The returned {@code String} is equal to
* {@code Double.toString(this.doubleValue())}
*
* @see Double#toString(double)
*/
@Override
public String toString() {
return Double.toString(value);
}
/*
* Methods inspired by the Double class.
*/
/**
* Returns {@code true} if {@code this} double precision number is infinite
* ({@link Double#POSITIVE_INFINITY} or {@link Double#NEGATIVE_INFINITY}).
*
* @return {@code true} if {@code this} number is infinite
*/
public boolean isInfinite() {
return Double.isInfinite(value);
}
/**
* Returns {@code true} if {@code this} double precision number is
* Not-a-Number ({@code NaN}), false otherwise.
*
* @return {@code true} if {@code this} is {@code NaN}
*/
public boolean isNaN() {
return Double.isNaN(value);
}
}