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/*
* 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.lang3.mutable;
/**
* A mutable {@code double} wrapper.
*
* Note that as MutableDouble does not extend Double, it is not treated by String.format as a Double parameter.
*
* @see Double
* @since 2.1
*/
public class MutableDouble extends Number implements Comparable, Mutable {
/**
* Required for serialization support.
*
* @see java.io.Serializable
*/
private static final long serialVersionUID = 1587163916L;
/** The mutable value. */
private double value;
/**
* Constructs a new MutableDouble with the default value of zero.
*/
public MutableDouble() {
super();
}
/**
* Constructs a new MutableDouble with the specified value.
*
* @param value the initial value to store
*/
public MutableDouble(final double value) {
super();
this.value = value;
}
/**
* Constructs a new MutableDouble with the specified value.
*
* @param value the initial value to store, not null
* @throws NullPointerException if the object is null
*/
public MutableDouble(final Number value) {
super();
this.value = value.doubleValue();
}
/**
* Constructs a new MutableDouble parsing the given string.
*
* @param value the string to parse, not null
* @throws NumberFormatException if the string cannot be parsed into a double
* @since 2.5
*/
public MutableDouble(final String value) {
super();
this.value = Double.parseDouble(value);
}
//-----------------------------------------------------------------------
/**
* Gets the value as a Double instance.
*
* @return the value as a Double, never null
*/
@Override
public Double getValue() {
return Double.valueOf(this.value);
}
/**
* Sets the value.
*
* @param value the value to set
*/
public void setValue(final double value) {
this.value = value;
}
/**
* Sets the value from any Number instance.
*
* @param value the value to set, not null
* @throws NullPointerException if the object is null
*/
@Override
public void setValue(final Number value) {
this.value = value.doubleValue();
}
//-----------------------------------------------------------------------
/**
* Checks whether the double value is the special NaN value.
*
* @return true if NaN
*/
public boolean isNaN() {
return Double.isNaN(value);
}
/**
* Checks whether the double value is infinite.
*
* @return true if infinite
*/
public boolean isInfinite() {
return Double.isInfinite(value);
}
//-----------------------------------------------------------------------
/**
* Increments the value.
*
* @since 2.2
*/
public void increment() {
value++;
}
/**
* Increments this instance's value by 1; this method returns the value associated with the instance
* immediately prior to the increment operation. This method is not thread safe.
*
* @return the value associated with the instance before it was incremented
* @since 3.5
*/
public double getAndIncrement() {
final double last = value;
value++;
return last;
}
/**
* Increments this instance's value by 1; this method returns the value associated with the instance
* immediately after the increment operation. This method is not thread safe.
*
* @return the value associated with the instance after it is incremented
* @since 3.5
*/
public double incrementAndGet() {
value++;
return value;
}
/**
* Decrements the value.
*
* @since 2.2
*/
public void decrement() {
value--;
}
/**
* Decrements this instance's value by 1; this method returns the value associated with the instance
* immediately prior to the decrement operation. This method is not thread safe.
*
* @return the value associated with the instance before it was decremented
* @since 3.5
*/
public double getAndDecrement() {
final double last = value;
value--;
return last;
}
/**
* Decrements this instance's value by 1; this method returns the value associated with the instance
* immediately after the decrement operation. This method is not thread safe.
*
* @return the value associated with the instance after it is decremented
* @since 3.5
*/
public double decrementAndGet() {
value--;
return value;
}
//-----------------------------------------------------------------------
/**
* Adds a value to the value of this instance.
*
* @param operand the value to add
* @since 2.2
*/
public void add(final double operand) {
this.value += operand;
}
/**
* Adds a value to the value of this instance.
*
* @param operand the value to add, not null
* @throws NullPointerException if the object is null
* @since 2.2
*/
public void add(final Number operand) {
this.value += operand.doubleValue();
}
/**
* Subtracts a value from the value of this instance.
*
* @param operand the value to subtract, not null
* @since 2.2
*/
public void subtract(final double operand) {
this.value -= operand;
}
/**
* Subtracts a value from the value of this instance.
*
* @param operand the value to subtract, not null
* @throws NullPointerException if the object is null
* @since 2.2
*/
public void subtract(final Number operand) {
this.value -= operand.doubleValue();
}
/**
* Increments this instance's value by {@code operand}; this method returns the value associated with the instance
* immediately after the addition operation. This method is not thread safe.
*
* @param operand the quantity to add, not null
* @return the value associated with this instance after adding the operand
* @since 3.5
*/
public double addAndGet(final double operand) {
this.value += operand;
return value;
}
/**
* Increments this instance's value by {@code operand}; this method returns the value associated with the instance
* immediately after the addition operation. This method is not thread safe.
*
* @param operand the quantity to add, not null
* @throws NullPointerException if {@code operand} is null
* @return the value associated with this instance after adding the operand
* @since 3.5
*/
public double addAndGet(final Number operand) {
this.value += operand.doubleValue();
return value;
}
/**
* Increments this instance's value by {@code operand}; this method returns the value associated with the instance
* immediately prior to the addition operation. This method is not thread safe.
*
* @param operand the quantity to add, not null
* @return the value associated with this instance immediately before the operand was added
* @since 3.5
*/
public double getAndAdd(final double operand) {
final double last = value;
this.value += operand;
return last;
}
/**
* Increments this instance's value by {@code operand}; this method returns the value associated with the instance
* immediately prior to the addition operation. This method is not thread safe.
*
* @param operand the quantity to add, not null
* @throws NullPointerException if {@code operand} is null
* @return the value associated with this instance immediately before the operand was added
* @since 3.5
*/
public double getAndAdd(final Number operand) {
final double last = value;
this.value += operand.doubleValue();
return last;
}
//-----------------------------------------------------------------------
// shortValue and byteValue rely on Number implementation
/**
* Returns the value of this MutableDouble as an int.
*
* @return the numeric value represented by this object after conversion to type int.
*/
@Override
public int intValue() {
return (int) value;
}
/**
* Returns the value of this MutableDouble as a long.
*
* @return the numeric value represented by this object after conversion to type long.
*/
@Override
public long longValue() {
return (long) value;
}
/**
* Returns the value of this MutableDouble as a float.
*
* @return the numeric value represented by this object after conversion to type float.
*/
@Override
public float floatValue() {
return (float) value;
}
/**
* Returns the value of this MutableDouble as a double.
*
* @return the numeric value represented by this object after conversion to type double.
*/
@Override
public double doubleValue() {
return value;
}
//-----------------------------------------------------------------------
/**
* Gets this mutable as an instance of Double.
*
* @return a Double instance containing the value from this mutable, never null
*/
public Double toDouble() {
return Double.valueOf(doubleValue());
}
//-----------------------------------------------------------------------
/**
* Compares this object against the specified object. The result is {@code true} if and only if the argument
* is not {@code null} and is a {@code Double} object that represents a double that has the identical
* bit pattern to the bit pattern of the double represented by this object. For this purpose, two
* {@code double} values are considered to be the same if and only if the method
* {@link Double#doubleToLongBits(double)}returns the same long value when applied to each.
*
* Note that in most cases, for two instances of class {@code Double},{@code d1} and {@code d2},
* the value of {@code d1.equals(d2)} is {@code true} if and only if
*
*
* d1.doubleValue() == d2.doubleValue()
*
*
*
*
* also has the value {@code true}. However, there are two exceptions:
*
* - If {@code d1} and {@code d2} both represent {@code Double.NaN}, then the
* {@code equals} method returns {@code true}, even though {@code Double.NaN==Double.NaN} has
* the value {@code false}.
*
- If {@code d1} represents {@code +0.0} while {@code d2} represents {@code -0.0},
* or vice versa, the {@code equal} test has the value {@code false}, even though
* {@code +0.0==-0.0} has the value {@code true}. This allows hashtables to operate properly.
*
*
* @param obj the object to compare with, null returns false
* @return {@code true} if the objects are the same; {@code false} otherwise.
*/
@Override
public boolean equals(final Object obj) {
return obj instanceof MutableDouble
&& Double.doubleToLongBits(((MutableDouble) obj).value) == Double.doubleToLongBits(value);
}
/**
* Returns a suitable hash code for this mutable.
*
* @return a suitable hash code
*/
@Override
public int hashCode() {
final long bits = Double.doubleToLongBits(value);
return (int) (bits ^ bits >>> 32);
}
//-----------------------------------------------------------------------
/**
* Compares this mutable to another in ascending order.
*
* @param other the other mutable to compare to, not null
* @return negative if this is less, zero if equal, positive if greater
*/
@Override
public int compareTo(final MutableDouble other) {
return Double.compare(this.value, other.value);
}
//-----------------------------------------------------------------------
/**
* Returns the String value of this mutable.
*
* @return the mutable value as a string
*/
@Override
public String toString() {
return String.valueOf(value);
}
}