/*
 * 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;

A mutable long wrapper.
Author:
Apache Software Foundation
See Also:
Long
Since:
2.1
Version:
$Id: MutableLong.java 905707 2010-02-02 16:59:59Z niallp $/**
 * A mutable <code>long</code> wrapper.
 * 
 * @see Long
 * @since 2.1
 * @author Apache Software Foundation
 * @version $Id: MutableLong.java 905707 2010-02-02 16:59:59Z niallp $
 */
public class MutableLong extends Number implements Comparable, Mutable {

    
Required for serialization support.
See Also:
Serializable/**
     * Required for serialization support.
     * 
     * @see java.io.Serializable
     */
    private static final long serialVersionUID = 62986528375L;

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

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

    
Constructs a new MutableLong with the specified value.
Params:
value –  the initial value to store/**
     * Constructs a new MutableLong with the specified value.
     * 
     * @param value  the initial value to store
     */
    public MutableLong(long value) {
        super();
        this.value = value;
    }

    
Constructs a new MutableLong with the specified value.
Params:
value –  the initial value to store, not null
Throws:
NullPointerException – if the object is null/**
     * Constructs a new MutableLong with the specified value.
     * 
     * @param value  the initial value to store, not null
     * @throws NullPointerException if the object is null
     */
    public MutableLong(Number value) {
        super();
        this.value = value.longValue();
    }

    
Constructs a new MutableLong parsing the given string.
Params:
value –  the string to parse, not null
Throws:
NumberFormatException – if the string cannot be parsed into a long
Since:
2.5/**
     * Constructs a new MutableLong parsing the given string.
     * 
     * @param value  the string to parse, not null
     * @throws NumberFormatException if the string cannot be parsed into a long
     * @since 2.5
     */
    public MutableLong(String value) throws NumberFormatException {
        super();
        this.value = Long.parseLong(value);
    }

    //-----------------------------------------------------------------------
    
Gets the value as a Long instance.
Returns:
the value as a Long, never null/**
     * Gets the value as a Long instance.
     * 
     * @return the value as a Long, never null
     */
    public Object getValue() {
        return new Long(this.value);
    }

    
Sets the value.
Params:
value –  the value to set/**
     * Sets the value.
     * 
     * @param value  the value to set
     */
    public void setValue(long value) {
        this.value = value;
    }

    
Sets the value from any Number instance.
Params:
value –  the value to set, not null
Throws:
NullPointerException – if the object is null
ClassCastException – if the type is not a Number/**
     * 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).longValue());
    }

    //-----------------------------------------------------------------------
    
Increments the value.
Since:
Commons Lang 2.2/**
     * Increments the value.
     *
     * @since Commons Lang 2.2
     */
    public void increment() {
        value++;
    }

    
Decrements the value.
Since:
Commons Lang 2.2/**
     * Decrements the value.
     *
     * @since Commons Lang 2.2
     */
    public void decrement() {
        value--;
    }

    //-----------------------------------------------------------------------
    
Adds a value to the value of this instance.
Params:
operand –  the value to add, not null
Since:
Commons Lang 2.2/**
     * 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(long operand) {
        this.value += operand;
    }

    
Adds a value to the value of this instance.
Params:
operand –  the value to add, not null
Throws:
NullPointerException – if the object is null
Since:
Commons Lang 2.2/**
     * 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.longValue();
    }

    
Subtracts a value from the value of this instance.
Params:
operand –  the value to subtract, not null
Since:
Commons Lang 2.2/**
     * 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(long operand) {
        this.value -= operand;
    }

    
Subtracts a value from the value of this instance.
Params:
operand –  the value to subtract, not null
Throws:
NullPointerException – if the object is null
Since:
Commons Lang 2.2/**
     * 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.longValue();
    }

    //-----------------------------------------------------------------------
    // shortValue and bytValue rely on Number implementation
    
Returns the value of this MutableLong as an int.
Returns:
the numeric value represented by this object after conversion to type int./**
     * Returns the value of this MutableLong 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 MutableLong as a long.
Returns:
the numeric value represented by this object after conversion to type long./**
     * Returns the value of this MutableLong as a long.
     *
     * @return the numeric value represented by this object after conversion to type long.
     */
    public long longValue() {
        return value;
    }

    
Returns the value of this MutableLong as a float.
Returns:
the numeric value represented by this object after conversion to type float./**
     * Returns the value of this MutableLong 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 MutableLong as a double.
Returns:
the numeric value represented by this object after conversion to type double./**
     * Returns the value of this MutableLong 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 Long.
Returns:
a Long instance containing the value from this mutable, never null/**
     * Gets this mutable as an instance of Long.
     *
     * @return a Long instance containing the value from this mutable, never null
     */
    public Long toLong() {
        return new Long(longValue());
    }

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

    
Returns a suitable hash code for this mutable.
Returns:
a suitable hash code/**
     * Returns a suitable hash code for this mutable.
     * 
     * @return a suitable hash code
     */
    public int hashCode() {
        return (int) (value ^ (value >>> 32));
    }

    //-----------------------------------------------------------------------
    
Compares this mutable to another in ascending order.
Params:
obj – the other mutable to compare to, not null
Throws:
ClassCastException – if the argument is not a MutableLong
Returns:
negative if this is less, zero if equal, positive if greater/**
     * 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
     * @throws ClassCastException if the argument is not a MutableLong
     */
    public int compareTo(Object obj) {
        MutableLong other = (MutableLong) obj;
        long anotherVal = other.value;
        return value < anotherVal ? -1 : (value == anotherVal ? 0 : 1);
    }

    //-----------------------------------------------------------------------
    
Returns the String value of this mutable.
Returns:
the mutable value as a string/**
     * Returns the String value of this mutable.
     * 
     * @return the mutable value as a string
     */
    public String toString() {
        return String.valueOf(value);
    }

}