/*
* Copyright 2008 Udai Gupta, Ralf Joachim
*
* Licensed 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.castor.cpa.query.object.condition;
import org.castor.cpa.query.Condition;
import org.castor.cpa.query.Expression;
/**
* Final class that represents comparison simple condition.
*
* @author <a href="mailto:mailtoud AT gmail DOT com">Udai Gupta</a>
* @author <a href="mailto:ralf DOT joachim AT syscon DOT eu">Ralf Joachim</a>
* @version $Revision: 7121 $ $Date: 2006-04-25 16:09:10 -0600 (Tue, 25 Apr 2006) $
* @since 1.3
*/
public final class Comparison extends AbstractCondition {
//--------------------------------------------------------------------------
/** Equal comparison operator. */
public static final ComparisonOperator EQUAL = new Equal();
/** Not equal comparison operator. */
public static final ComparisonOperator NOT_EQUAL = new NotEqual();
/** Less than comparison operator. */
public static final ComparisonOperator LESS_THAN = new LessThan();
/** Less equal comparison operator. */
public static final ComparisonOperator LESS_EQUAL = new LessEqual();
/** Greater equal comparison operator. */
public static final ComparisonOperator GREATER_EQUAL = new GreaterEqual();
/** Greater than comparison operator. */
public static final ComparisonOperator GREATER_THAN = new GreaterThan();
//--------------------------------------------------------------------------
/** Comarison operator of comparison condition. */
private ComparisonOperator _operator;
/** Left side expression of comparison condition. */
private Expression _leftSide;
/** Right side expression of comparison condition. */
private Expression _rightSide;
//--------------------------------------------------------------------------
/**
* Construct new comparison.
*
* @param operator Comparison operator for the comparison.
*/
public Comparison(final ComparisonOperator operator) {
if (operator == null) { throw new NullPointerException(); }
_operator = operator;
}
//--------------------------------------------------------------------------
/**
* {@inheritDoc}
*/
public Condition not() {
_operator = _operator.not();
return this;
}
//--------------------------------------------------------------------------
/**
* Get comarison operator of comparison condition.
*
* @return Comarison operator of comparison condition.
*/
public ComparisonOperator getOperator() {
return _operator;
}
/**
* Get left side expression of comparison condition.
*
* @return Left side expression of comparison condition.
*/
public Expression getLeftSide() {
return _leftSide;
}
/**
* Set left side expression of comparison condition.
*
* @param expression Left side expression of comparison condition.
*/
public void setLeftSide(final Expression expression) {
_leftSide = expression;
}
/**
* Get right side expression of comparison condition.
*
* @return Right side expression of comparison condition.
*/
public Expression getRightSide() {
return _rightSide;
}
/**
* Set right side expression of comparison condition.
*
* @param expression Right side expression of comparison condition.
*/
public void setRightSide(final Expression expression) {
_rightSide = expression;
}
//--------------------------------------------------------------------------
/**
* {@inheritDoc}
*/
public StringBuilder toString(final StringBuilder sb) {
sb.append('(');
if (_leftSide != null) {
_leftSide.toString(sb);
}
sb.append(_operator.getOperator());
if (_rightSide != null) {
_rightSide.toString(sb);
}
sb.append(')');
return sb;
}
//--------------------------------------------------------------------------
}