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Diffstat (limited to 'src/main/java/org/apache/commons/lang3/mutable/MutableFloat.java')
-rw-r--r-- | src/main/java/org/apache/commons/lang3/mutable/MutableFloat.java | 408 |
1 files changed, 408 insertions, 0 deletions
diff --git a/src/main/java/org/apache/commons/lang3/mutable/MutableFloat.java b/src/main/java/org/apache/commons/lang3/mutable/MutableFloat.java new file mode 100644 index 000000000..d1aa9f802 --- /dev/null +++ b/src/main/java/org/apache/commons/lang3/mutable/MutableFloat.java @@ -0,0 +1,408 @@ +/* + * 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); + } + +} |