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Apache Commons Lang, a package of Java utility classes for the
classes that are in java.lang's hierarchy, or are considered to be so
standard as to justify existence in java.lang.
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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 float} wrapper.
*
* Note that as MutableFloat does not extend Float, it is not treated by String.format as a Float parameter.
*
*
* @see Float
* @since 2.1
*/
public class MutableFloat extends Number implements Comparable, Mutable {
/**
* Required for serialization support.
*
* @see java.io.Serializable
*/
private static final long serialVersionUID = 5787169186L;
/** The mutable value. */
private float value;
/**
* Constructs a new MutableFloat with the default value of zero.
*/
public MutableFloat() {
}
/**
* Constructs a new MutableFloat with the specified value.
*
* @param value the initial value to store
*/
public MutableFloat(final float value) {
this.value = value;
}
/**
* Constructs a new MutableFloat with the specified value.
*
* @param value the initial value to store, not null
* @throws NullPointerException if the object is null
*/
public MutableFloat(final Number value) {
this.value = value.floatValue();
}
/**
* Constructs a new MutableFloat parsing the given string.
*
* @param value the string to parse, not null
* @throws NumberFormatException if the string cannot be parsed into a float
* @since 2.5
*/
public MutableFloat(final String value) {
this.value = Float.parseFloat(value);
}
/**
* Adds a value to the value of this instance.
*
* @param operand the value to add, not null
* @since 2.2
*/
public void add(final float 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.floatValue();
}
/**
* 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 float addAndGet(final float 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 float addAndGet(final Number operand) {
this.value += operand.floatValue();
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 MutableFloat other) {
return Float.compare(this.value, other.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 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 float decrementAndGet() {
value--;
return value;
}
/**
* Returns the value of this MutableFloat as a double.
*
* @return the numeric value represented by this object after conversion to type double.
*/
@Override
public double doubleValue() {
return value;
}
/**
* Compares this object against some other object. The result is {@code true} if and only if the argument is
* not {@code null} and is a {@link Float} object that represents a {@code float} that has the
* identical bit pattern to the bit pattern of the {@code float} represented by this object. For this
* purpose, two float values are considered to be the same if and only if the method
* {@link Float#floatToIntBits(float)}returns the same int value when applied to each.
*
* Note that in most cases, for two instances of class {@link Float},{@code f1} and {@code f2},
* the value of {@code f1.equals(f2)} is {@code true} if and only if
*
*
* f1.floatValue() == f2.floatValue()
*
*
*
*
* also has the value {@code true}. However, there are two exceptions:
*
* - If {@code f1} and {@code f2} both represent {@code Float.NaN}, then the
* {@code equals} method returns {@code true}, even though {@code Float.NaN == Float.NaN} has
* the value {@code false}.
*
- If {@code f1} represents {@code +0.0f} while {@code f2} represents {@code -0.0f},
* or vice versa, the {@code equal} test has the value {@code false}, even though
* {@code 0.0f == -0.0f} has the value {@code true}.
*
* This definition 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.
* @see Float#floatToIntBits(float)
*/
@Override
public boolean equals(final Object obj) {
return obj instanceof MutableFloat
&& Float.floatToIntBits(((MutableFloat) obj).value) == Float.floatToIntBits(value);
}
/**
* Returns the value of this MutableFloat as a float.
*
* @return the numeric value represented by this object after conversion to type float.
*/
@Override
public float floatValue() {
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 float getAndAdd(final float operand) {
final float 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 float getAndAdd(final Number operand) {
final float last = value;
this.value += operand.floatValue();
return last;
}
/**
* 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 float getAndDecrement() {
final float last = value;
value--;
return last;
}
/**
* 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 float getAndIncrement() {
final float last = value;
value++;
return last;
}
/**
* Gets the value as a Float instance.
*
* @return the value as a Float, never null
*/
@Override
public Float getValue() {
return Float.valueOf(this.value);
}
/**
* Returns a suitable hash code for this mutable.
*
* @return a suitable hash code
*/
@Override
public int hashCode() {
return Float.floatToIntBits(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 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 float incrementAndGet() {
value++;
return value;
}
// shortValue and byteValue rely on Number implementation
/**
* Returns the value of this MutableFloat as an int.
*
* @return the numeric value represented by this object after conversion to type int.
*/
@Override
public int intValue() {
return (int) value;
}
/**
* Checks whether the float value is infinite.
*
* @return true if infinite
*/
public boolean isInfinite() {
return Float.isInfinite(value);
}
/**
* Checks whether the float value is the special NaN value.
*
* @return true if NaN
*/
public boolean isNaN() {
return Float.isNaN(value);
}
/**
* Returns the value of this MutableFloat as a long.
*
* @return the numeric value represented by this object after conversion to type long.
*/
@Override
public long longValue() {
return (long) value;
}
/**
* Sets the value.
*
* @param value the value to set
*/
public void setValue(final float 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.floatValue();
}
/**
* Subtracts a value from the value of this instance.
*
* @param operand the value to subtract
* @since 2.2
*/
public void subtract(final float 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.floatValue();
}
/**
* Gets this mutable as an instance of Float.
*
* @return a Float instance containing the value from this mutable, never null
*/
public Float toFloat() {
return Float.valueOf(floatValue());
}
/**
* Returns the String value of this mutable.
*
* @return the mutable value as a string
*/
@Override
public String toString() {
return String.valueOf(value);
}
}