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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.
+ * <p>
+ * Note that as MutableFloat does not extend Float, it is not treated by String.format as a Float parameter.
+ * </p>
+ *
+ * @see Float
+ * @since 2.1
+ */
+public class MutableFloat extends Number implements Comparable<MutableFloat>, Mutable<Number> {
+
+ /**
+ * 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);
+ }
+
+ /**
+ * 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 {@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.
+ * <p>
+ * 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 <blockquote>
+ *
+ * <pre>
+ * f1.floatValue() == f2.floatValue()
+ * </pre>
+ *
+ * </blockquote>
+ * <p>
+ * also has the value {@code true}. However, there are two exceptions:
+ * <ul>
+ * <li>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}.
+ * <li>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}.
+ * </ul>
+ * 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 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);
+ }
+
+}