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Java example source code file (MutableByte.java)

This example Java source code file (MutableByte.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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Java - Java tags/keywords

byte, comparable, mutablebyte, number, numberformatexception, object, override, string

The MutableByte.java Java example source code

/*
 * 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;

import org.apache.commons.lang3.math.NumberUtils;

/**
 * A mutable <code>byte wrapper.
 * <p>
 * Note that as MutableByte does not extend Byte, it is not treated by String.format as a Byte parameter. 
 * 
 * @see Byte
 * @since 2.1
 */
public class MutableByte extends Number implements Comparable<MutableByte>, Mutable {

    /**
     * Required for serialization support.
     * 
     * @see java.io.Serializable
     */
    private static final long serialVersionUID = -1585823265L;

    /** The mutable value. */
    private byte value;

    /**
     * Constructs a new MutableByte with the default value of zero.
     */
    public MutableByte() {
        super();
    }

    /**
     * Constructs a new MutableByte with the specified value.
     * 
     * @param value  the initial value to store
     */
    public MutableByte(final byte value) {
        super();
        this.value = value;
    }

    /**
     * Constructs a new MutableByte with the specified value.
     * 
     * @param value  the initial value to store, not null
     * @throws NullPointerException if the object is null
     */
    public MutableByte(final Number value) {
        super();
        this.value = value.byteValue();
    }

    /**
     * Constructs a new MutableByte parsing the given string.
     * 
     * @param value  the string to parse, not null
     * @throws NumberFormatException if the string cannot be parsed into a byte
     * @since 2.5
     */
    public MutableByte(final String value) throws NumberFormatException {
        super();
        this.value = Byte.parseByte(value);
    }

    //-----------------------------------------------------------------------
    /**
     * Gets the value as a Byte instance.
     * 
     * @return the value as a Byte, never null
     */
    @Override
    public Byte getValue() {
        return Byte.valueOf(this.value);
    }

    /**
     * Sets the value.
     * 
     * @param value  the value to set
     */
    public void setValue(final byte 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.byteValue();
    }

    //-----------------------------------------------------------------------
    /**
     * Increments the value.
     *
     * @since Commons Lang 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 byte getAndIncrement() {
        byte 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 byte incrementAndGet() {
        value++;
        return value;
    }

    /**
     * Decrements the value.
     *
     * @since Commons Lang 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 byte getAndDecrement() {
        byte 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 byte decrementAndGet() {
        value--;
        return 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(final byte 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(final Number operand) {
        this.value += operand.byteValue();
    }

    /**
     * Subtracts a value from the value of this instance.
     * 
     * @param operand  the value to subtract, not null
     * @since Commons Lang 2.2
     */
    public void subtract(final byte 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(final Number operand) {
        this.value -= operand.byteValue();
    }

    /**
     * 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
     */
    public byte addAndGet(final byte 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
     */
    public byte addAndGet(final Number operand) {
        this.value += operand.byteValue();
        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
     */
    public byte getAndAdd(final byte operand) {
        byte 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
     */
    public byte getAndAdd(final Number operand) {
        byte last = value;
        this.value += operand.byteValue();
        return last;
    }

    //-----------------------------------------------------------------------
    // shortValue relies on Number implementation
    /**
     * Returns the value of this MutableByte as a byte.
     *
     * @return the numeric value represented by this object after conversion to type byte.
     */
    @Override
    public byte byteValue() {
        return value;
    }

    /**
     * Returns the value of this MutableByte as an int.
     *
     * @return the numeric value represented by this object after conversion to type int.
     */
    @Override
    public int intValue() {
        return value;
    }

    /**
     * Returns the value of this MutableByte as a long.
     *
     * @return the numeric value represented by this object after conversion to type long.
     */
    @Override
    public long longValue() {
        return value;
    }

    /**
     * Returns the value of this MutableByte 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 MutableByte 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 Byte.
     *
     * @return a Byte instance containing the value from this mutable
     */
    public Byte toByte() {
        return Byte.valueOf(byteValue());
    }

    //-----------------------------------------------------------------------
    /**
     * Compares this object to the specified object. The result is <code>true if and only if the argument is
     * not <code>null and is a MutableByte object that contains the same byte value
     * as this object.
     * 
     * @param obj  the object to compare with, null returns false
     * @return <code>true if the objects are the same; false otherwise.
     */
    @Override
    public boolean equals(final Object obj) {
        if (obj instanceof MutableByte) {
            return value == ((MutableByte) obj).byteValue();
        }
        return false;
    }

    /**
     * Returns a suitable hash code for this mutable.
     * 
     * @return a suitable hash code
     */
    @Override
    public int hashCode() {
        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 MutableByte other) {
        return NumberUtils.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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