org.apache.commons.lang.mutable.MutableFloat Maven / Gradle / Ivy
/*
* 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.lang.mutable;
import org.apache.commons.lang.math.NumberUtils;
/**
* A mutable float wrapper.
*
* @see Float
* @since 2.1
* @author Apache Software Foundation
* @version $Id: MutableFloat.java 905707 2010-02-02 16:59:59Z niallp $
*/
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() {
super();
}
/**
* Constructs a new MutableFloat with the specified value.
*
* @param value the initial value to store
*/
public MutableFloat(float value) {
super();
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(Number value) {
super();
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(String value) throws NumberFormatException {
super();
this.value = Float.parseFloat(value);
}
//-----------------------------------------------------------------------
/**
* Gets the value as a Float instance.
*
* @return the value as a Float, never null
*/
public Object getValue() {
return new Float(this.value);
}
/**
* Sets the value.
*
* @param value the value to set
*/
public void setValue(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
* @throws ClassCastException if the type is not a {@link Number}
*/
public void setValue(Object value) {
setValue(((Number) value).floatValue());
}
//-----------------------------------------------------------------------
/**
* Checks whether the float value is the special NaN value.
*
* @return true if NaN
*/
public boolean isNaN() {
return Float.isNaN(value);
}
/**
* Checks whether the float value is infinite.
*
* @return true if infinite
*/
public boolean isInfinite() {
return Float.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, not null
* @since Commons Lang 2.2
*/
public void add(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 Commons Lang 2.2
*/
public void add(Number operand) {
this.value += operand.floatValue();
}
/**
* Subtracts a value from the value of this instance.
*
* @param operand the value to subtract
* @since Commons Lang 2.2
*/
public void subtract(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 Commons Lang 2.2
*/
public void subtract(Number operand) {
this.value -= operand.floatValue();
}
//-----------------------------------------------------------------------
// shortValue and bytValue 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.
*/
public int intValue() {
return (int) value;
}
/**
* Returns the value of this MutableFloat as a long.
*
* @return the numeric value represented by this object after conversion to type long.
*/
public long longValue() {
return (long) value;
}
/**
* Returns the value of this MutableFloat as a float.
*
* @return the numeric value represented by this object after conversion to type float.
*/
public float floatValue() {
return value;
}
/**
* Returns the value of this MutableFloat as a double.
*
* @return the numeric value represented by this object after conversion to type double.
*/
public double doubleValue() {
return value;
}
//-----------------------------------------------------------------------
/**
* Gets this mutable as an instance of Float.
*
* @return a Float instance containing the value from this mutable, never null
*/
public Float toFloat() {
return new Float(floatValue());
}
//-----------------------------------------------------------------------
/**
* Compares this object against some other object. The result is true if and only if the argument is
* not null and is a Float object that represents a float that has the
* identical bit pattern to the bit pattern of the 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 Float,f1 and f2,
* the value of f1.equals(f2) is true if and only if
*
*
* f1.floatValue() == f2.floatValue()
*
*
*
*
* also has the value true. However, there are two exceptions:
*
* - If
f1 and f2 both represent Float.NaN, then the
* equals method returns true, even though Float.NaN==Float.NaN has
* the value false.
* - If
f1 represents +0.0f while f2 represents -0.0f,
* or vice versa, the equal test has the value false, even though
* 0.0f==-0.0f has the value true.
*
* This definition 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.
* @see java.lang.Float#floatToIntBits(float)
*/
public boolean equals(Object obj) {
return (obj instanceof MutableFloat)
&& (Float.floatToIntBits(((MutableFloat) obj).value) == Float.floatToIntBits(value));
}
/**
* Returns a suitable hash code for this mutable.
*
* @return a suitable hash code
*/
public int hashCode() {
return Float.floatToIntBits(value);
}
//-----------------------------------------------------------------------
/**
* Compares this mutable to another in ascending order.
*
* @param obj the other mutable to compare to, not null
* @return negative if this is less, zero if equal, positive if greater
*/
public int compareTo(Object obj) {
MutableFloat other = (MutableFloat) obj;
float anotherVal = other.value;
return NumberUtils.compare(value, anotherVal);
}
//-----------------------------------------------------------------------
/**
* Returns the String value of this mutable.
*
* @return the mutable value as a string
*/
public String toString() {
return String.valueOf(value);
}
}