/*
 * 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;

import java.io.Serializable;

import org.apache.commons.lang.BooleanUtils;

A mutable boolean wrapper.
Author:
Apache Software Foundation
See Also:
Boolean
Since:
2.2
Version:
$Id: MutableBoolean.java 905707 2010-02-02 16:59:59Z niallp $/**
 * A mutable <code>boolean</code> wrapper.
 * 
 * @see Boolean
 * @since 2.2
 * @author Apache Software Foundation
 * @version $Id: MutableBoolean.java 905707 2010-02-02 16:59:59Z niallp $
 */
public class MutableBoolean implements Mutable, Serializable, Comparable {

    
Required for serialization support.
See Also:
Serializable/**
     * Required for serialization support.
     * 
     * @see java.io.Serializable
     */
    private static final long serialVersionUID = -4830728138360036487L;

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

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

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

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

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

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

    
Sets the value from any Boolean instance.
Params:
value –  the value to set, not null
Throws:
NullPointerException – if the object is null/**
     * Sets the value from any Boolean instance.
     * 
     * @param value  the value to set, not null
     * @throws NullPointerException if the object is null
     */
    public void setValue(Object value) {
        setValue(((Boolean) value).booleanValue());
    }

    //-----------------------------------------------------------------------
    
Checks if the current value is true.
Returns:
true if the current value is true
Since:
2.5/**
     * Checks if the current value is <code>true</code>.
     * 
     * @return <code>true</code> if the current value is <code>true</code>
     * @since 2.5
     */
    public boolean isTrue() {
        return value == true;
    }

    
Checks if the current value is false.
Returns:
true if the current value is false
Since:
2.5/**
     * Checks if the current value is <code>false</code>.
     * 
     * @return <code>true</code> if the current value is <code>false</code>
     * @since 2.5
     */
    public boolean isFalse() {
        return value == false;
    }

    //-----------------------------------------------------------------------
    
Returns the value of this MutableBoolean as a boolean.
Returns:
the boolean value represented by this object./**
     * Returns the value of this MutableBoolean as a boolean.
     * 
     * @return the boolean value represented by this object.
     */
    public boolean booleanValue() {
        return value;
    }

    //-----------------------------------------------------------------------
    
Gets this mutable as an instance of Boolean.
Returns:
a Boolean instance containing the value from this mutable, never null
Since:
2.5/**
     * Gets this mutable as an instance of Boolean.
     *
     * @return a Boolean instance containing the value from this mutable, never null
     * @since 2.5
     */
    public Boolean toBoolean() {
        return  BooleanUtils.toBooleanObject(this.value);
    }

    //-----------------------------------------------------------------------
    
Compares this object to the specified object. The result is true if and only if the argument is
not null and is an MutableBoolean object that contains the same
boolean 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 an <code>MutableBoolean</code> object that contains the same
     * <code>boolean</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 MutableBoolean) {
            return value == ((MutableBoolean) obj).booleanValue();
        }
        return false;
    }

    
Returns a suitable hash code for this mutable.
Returns:
the hash code returned by Boolean.TRUE or Boolean.FALSE/**
     * Returns a suitable hash code for this mutable.
     * 
     * @return the hash code returned by <code>Boolean.TRUE</code> or <code>Boolean.FALSE</code>
     */
    public int hashCode() {
        return value ? Boolean.TRUE.hashCode() : Boolean.FALSE.hashCode();
    }

    //-----------------------------------------------------------------------
    
Compares this mutable to another in ascending order.
Params:
obj – the other mutable to compare to, not null
Returns:
negative if this is less, zero if equal, positive if greater
 where false is less than true/**
     * 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
     *  where false is less than true
     */
    public int compareTo(Object obj) {
        MutableBoolean other = (MutableBoolean) obj;
        boolean anotherVal = other.value;
        return value == anotherVal ? 0 : (value ? 1 : -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);
    }

}