/**
* 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.operators;
import org.apache.ambari.server.api.predicate.InvalidQueryException;
/**
* Factory of Logical Operators.
*/
public class LogicalOperatorFactory {
/**
* Creates a logical operator based on the operator token.
*
* @param operator string representation of operator
* @param ctxPrecedence precedence value of current context
*
* @return a logical operator instance
* @throws InvalidQueryException if the operator string is invalid
*/
public static LogicalOperator createOperator(String operator, int ctxPrecedence)
throws InvalidQueryException {
if ("&".equals(operator)) {
return new AndOperator(ctxPrecedence);
} else if ("|".equals(operator)) {
return new OrOperator(ctxPrecedence);
} else if ("!".equals(operator)) {
return new NotOperator(ctxPrecedence);
} else {
throw new RuntimeException("Invalid Logical Operator Type: " + operator);
}
}
}