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Statistical sampling library for use in virtdata libraries, based on apache commons math 4

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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 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() { super(); } /** * Constructs a new MutableFloat with the specified value. * * @param value the initial value to store */ public MutableFloat(final 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(final 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(final String value) { super(); this.value = Float.parseFloat(value); } //----------------------------------------------------------------------- /** * Gets the value as a Float instance. * * @return the value as a Float, never null */ @Override public Float getValue() { return Float.valueOf(this.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(); } //----------------------------------------------------------------------- /** * 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 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 float getAndIncrement() { final float 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 float 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 float getAndDecrement() { final float 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 float decrementAndGet() { value--; return 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(); } /** * 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(); } /** * 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; } /** * 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; } //----------------------------------------------------------------------- // 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; } /** * 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; } /** * 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; } /** * 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; } //----------------------------------------------------------------------- /** * 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()); } //----------------------------------------------------------------------- /** * 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) */ @Override public boolean equals(final 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 */ @Override public int hashCode() { return Float.floatToIntBits(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); } //----------------------------------------------------------------------- /** * Returns the String value of this mutable. * * @return the mutable value as a string */ @Override public String toString() { return String.valueOf(value); } }




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