/*
* This file is part of the GeoLatte project.
*
* GeoLatte is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GeoLatte is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with GeoLatte. If not, see <http://www.gnu.org/licenses/>.
*
* Copyright (C) 2010 - 2010 and Ownership of code is shared by:
* Qmino bvba - Romeinsestraat 18 - 3001 Heverlee (http://www.qmino.com)
* Geovise bvba - Generaal Eisenhowerlei 9 - 2140 Antwerpen (http://www.geovise.com)
*/
package org.geolatte.common.expressions;
/**
* <p>
* Abstract base class for all boolean expressions. Offers boolean concatenation operations such as And and Or.
* </p>
* <p>
* <i>Creation-Date</i>: 9-apr-2010<br>
* <i>Creation-Time</i>: 11:48:54<br>
* </p>
*
* @author Peter Rigole
* @author Bert Vanhooff
* @author <a href="http://www.qmino.com">Qmino bvba</a>
* @since SDK1.5
*/
public abstract class BooleanExpression implements Expression<Boolean>, ComparableExpression<Boolean> {
/**
* Creates an And expression from this expression (as left expression) and the given expression (as right
* expression).
*
* @param right The right expression.
* @return An And expression.
*/
public And and(Expression<Boolean> right) {
return new And(this, right);
}
/**
* Creates an Or expression from the given expressions.
*
* @param right The right expression.
* @return An Or expression.
*/
public Or or(Expression<Boolean> right) {
return new Or(this, right);
}
public int compareTo(Object evaluateObject, Boolean value) throws ClassCastException, NullPointerException {
if (value == null)
throw new NullPointerException("Cannot compare boolean to null");
Boolean thisBoolean = evaluate(evaluateObject);
if (thisBoolean == null)
throw new NullPointerException("BooleanExpression evaluates to null, cannot compare this.");
if (thisBoolean)
return value ? 0 : 1;
else
return value ? -1 : 0;
}
public void switchOn(BasicTypeSwitch switcher) {
switcher.caseBoolean(this);
}
}