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/*******************************************************************************
* Copyright (c) 2008, 2009 Oracle. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0, which accompanies this distribution
* and is available at http://www.eclipse.org/legal/epl-v10.html.
*
* Contributors:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.utility.internal;
import java.io.Serializable;
/**
* Provide a container for passing a flag that can be changed by the recipient.
*
* @see SynchronizedBoolean
*/
public class BooleanReference
implements Cloneable, Serializable
{
/** Backing <code>boolean</code>. */
private volatile boolean value;
private static final long serialVersionUID = 1L;
// ********** constructors **********
/**
* Create a <code>boolean</code> reference with the specified initial value.
*/
public BooleanReference(boolean value) {
super();
this.value = value;
}
/**
* Create a <code>boolean</code> reference with an initial value of
* <code>false</code>.
*/
public BooleanReference() {
this(false);
}
// ********** accessors **********
/**
* Return the current <code>boolean</code> value.
*/
public boolean getValue() {
return this.value;
}
/**
* Return whether the current <code>boolean</code> value is the specified
* value.
*/
public boolean is(boolean v) {
return this.value == v;
}
/**
* Return whether the current <code>boolean</code> value is not the
* specified value.
*/
public boolean isNot(boolean v) {
return this.value != v;
}
/**
* Return whether the current <code>boolean</code> value is
* <code>true</code>.
*/
public boolean isTrue() {
return this.value;
}
/**
* Return whether the current <code>boolean</code> value is
* <code>false</code>.
*/
public boolean isFalse() {
return ! this.value;
}
/**
* Set the <code>boolean</code> value.
* Return the previous value.
*/
public boolean setValue(boolean value) {
boolean old = this.value;
this.value = value;
return old;
}
/**
* Set the <code>boolean</code> value to the NOT of its current value.
* Return the new value.
*/
public boolean flip() {
return this.value = ! this.value;
}
/**
* Set the <code>boolean</code> value to the NOT of the specified value.
* Return the previous value.
*/
public boolean setNot(boolean v) {
return this.setValue( ! v);
}
/**
* Set the <code>boolean</code> value to <code>true</code>.
* Return the previous value.
*/
public boolean setTrue() {
return this.setValue(true);
}
/**
* Set the <code>boolean</code> value to <code>false</code>.
* Return the previous value.
*/
public boolean setFalse() {
return this.setValue(false);
}
// ********** standard methods **********
@Override
public Object clone() {
try {
return super.clone();
} catch (CloneNotSupportedException ex) {
throw new InternalError();
}
}
@Override
public boolean equals(Object o) {
return (o instanceof BooleanReference) &&
(this.value == ((BooleanReference) o).value);
}
@Override
public int hashCode() {
return this.value ? 1 : 0;
}
@Override
public String toString() {
return '[' + String.valueOf(this.value) + ']';
}
}
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