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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.lang.mutable;
import java.io.Serializable;
import org.apache.commons.lang.BooleanUtils;
/**
* A mutable boolean 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 java.io.Serializable
*/
private static final long serialVersionUID = -4830728138360036487L;
/** The mutable value. */
private boolean value;
/**
* Constructs a new MutableBoolean with the default value of false.
*/
public MutableBoolean() {
super();
}
/**
* 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.
*
* @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.
*
* @return the value as a Boolean, never null
*/
public Object getValue() {
return BooleanUtils.toBooleanObject(this.value);
}
/**
* Sets the value.
*
* @param value the value to set
*/
public void setValue(boolean value) {
this.value = value;
}
/**
* 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.
*
* @return true if the current value is true
* @since 2.5
*/
public boolean isTrue() {
return value == true;
}
/**
* Checks if the current value is false.
*
* @return true if the current value is false
* @since 2.5
*/
public boolean isFalse() {
return value == false;
}
//-----------------------------------------------------------------------
/**
* 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.
*
* @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.
*
* @param obj the object to compare with, null returns false
* @return true if the objects are the same; false 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.
*
* @return the hash code returned by Boolean.TRUE or Boolean.FALSE
*/
public int hashCode() {
return value ? Boolean.TRUE.hashCode() : Boolean.FALSE.hashCode();
}
//-----------------------------------------------------------------------
/**
* 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.
*
* @return the mutable value as a string
*/
public String toString() {
return String.valueOf(value);
}
}