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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 com.landawn.abacus.util;
/**
*
* Note: it's copied from Apache Commons Lang developed at The Apache Software Foundation (http://www.apache.org/), or
* under the Apache License 2.0. The methods copied from other products/frameworks may be modified in this class.
*
*
* A mutable 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
* @version $Id: MutableDouble.java 1669791 2015-03-28 15:22:59Z britter $
*/
public final 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.
*/
MutableDouble() {
super();
}
/**
* Constructs a new MutableDouble with the specified value.
*
* @param value the initial value to store
*/
MutableDouble(final double value) {
super();
this.value = value;
}
public static MutableDouble of(final double value) {
return new MutableDouble(value);
}
public double value() {
return value;
}
//-----------------------------------------------------------------------
/**
* Gets the value as a Double instance.
*
* @return the value as a Double, never null
* @deprecated replace by {@link #value()}.
*/
@Deprecated
public double getValue() {
return value;
}
/**
* Sets the value.
*
* @param value the value to set
*/
public void setValue(final double value) {
this.value = value;
}
public double getAndSet(final double value) {
final double result = this.value;
this.value = value;
return result;
}
public double setAndGet(final double value) {
this.value = value;
return this.value;
}
/**
* Set with the specified new value and returns true if predicate returns true.
* Otherwise just return false without setting the value to new value.
*
* @param newValue
* @param predicate - test the current value.
* @return
*/
public boolean setIf(double newValue, Try.DoublePredicate predicate) throws E {
if (predicate.test(this.value)) {
this.value = newValue;
return true;
}
return false;
}
/**
* Set with the specified new value and returns true if predicate returns true.
* Otherwise just return false without setting the value to new value.
*
* @param newValue
* @param predicate the first parameter is the current value, the second parameter is the new value.
* @return
*/
public boolean setIf(double newValue, Try.DoubleBiPredicate predicate) throws E {
if (predicate.test(this.value, newValue)) {
this.value = newValue;
return true;
}
return false;
}
//-----------------------------------------------------------------------
/**
* 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 Commons Lang 2.2
*/
public void increment() {
value++;
}
/**
* Decrements the value.
*
* @since Commons Lang 2.2
*/
public void decrement() {
value--;
}
//-----------------------------------------------------------------------
/**
* Adds a value to the value of this instance.
*
* @param operand the value to add
* @since Commons Lang 2.2
*/
public void add(final double operand) {
this.value += operand;
}
/**
* Subtracts a value from the value of this instance.
*
* @param operand the value to subtract, not null
* @since Commons Lang 2.2
*/
public void subtract(final double operand) {
this.value -= operand;
}
/**
* Increments by one the current value.
*
* @return the previous value
*/
public final double getAndIncrement() {
return value++;
}
/**
* Decrements by one the current value.
*
* @return the previous value
*/
public final double getAndDecrement() {
return value--;
}
/**
* Increments by one the current value.
*
* @return the updated value
*/
public final double incrementAndGet() {
return ++value;
}
/**
* Decrements by one the current value.
*
* @return the updated value
*/
public final double decrementAndGet() {
return --value;
}
/**
* Adds the given value to the current value.
*
* @param delta the value to add
* @return the previous value
*/
public final double getAndAdd(final double delta) {
final double prev = value;
value += delta;
return prev;
}
/**
* Adds the given value to the current value.
*
* @param delta the value to add
* @return the updated value
*/
public final double addAndGet(final double delta) {
return value += delta;
}
//-----------------------------------------------------------------------
// 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;
}
//-----------------------------------------------------------------------
/**
* 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);
}
//-----------------------------------------------------------------------
/**
* Compares this object against the specified object. The result is true if and only if the argument
* is not null and is a 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
* 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 Double,d1 and d2,
* the value of d1.equals(d2) is true if and only if
*
*
* d1.doubleValue() == d2.doubleValue()
*
*
*
*
* also has the value true. However, there are two exceptions:
*
* - If
d1 and d2 both represent Double.NaN, then the
* equals method returns true, even though Double.NaN==Double.NaN has
* the value false.
* - If
d1 represents +0.0 while d2 represents -0.0,
* or vice versa, the equal test has the value false, even though
* +0.0==-0.0 has the value true. This allows hashtables to operate properly.
*
*
* @param obj the object to compare with, null returns false
* @return true if the objects are the same; false otherwise.
*/
@Override
public boolean equals(final Object obj) {
return obj instanceof MutableDouble && Double.compare(((MutableDouble) obj).value, value) == 0;
}
/**
* 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);
}
//-----------------------------------------------------------------------
/**
* Returns the String value of this mutable.
*
* @return the mutable value as a string
*/
@Override
public String toString() {
return String.valueOf(value);
}
}