/**
* 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.ambari.server.api.predicate.expressions;
import java.util.ArrayList;
import java.util.List;
import org.apache.ambari.server.api.predicate.InvalidQueryException;
import org.apache.ambari.server.api.predicate.operators.LogicalOperator;
import org.apache.ambari.server.controller.predicate.NotPredicate;
import org.apache.ambari.server.controller.spi.Predicate;
/**
* A 'NOT' logical expression representation.
* Negates a corresponding right operand.
*/
public class NotLogicalExpression extends LogicalExpression {
/**
* Constructor.
*
* @param op the logical operator
*/
public NotLogicalExpression(LogicalOperator op) {
super(op);
}
@Override
public List<Expression> merge(Expression left, Expression right, int precedence) {
if (getOperator().getPrecedence() == precedence && getRightOperand() == null) {
List<Expression> listExpressions = new ArrayList<>();
if (left != null) {
listExpressions.add(left);
}
setRightOperand(right);
listExpressions.add(this);
return listExpressions;
} else {
// do nothing, already merged
return defaultMerge(left, right);
}
}
@Override
public Predicate toPredicate() throws InvalidQueryException {
return new NotPredicate(getRightOperand().toPredicate());
}
}