/**
* 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 relational operators.
*/
public class RelationalOperatorFactory {
/**
* Create a relational operator based on the string representation
* of the operator.
*
* @param operator the string representation of the operator
*
* @return relational operator for the given string
* @throws InvalidQueryException if an invalid operator is passed in
*/
public static RelationalOperator createOperator(String operator) throws InvalidQueryException {
if ("!=".equals(operator)) {
return new NotEqualsOperator();
} else if ("=".equals(operator)) {
return new EqualsOperator();
} else if ("<=".equals(operator)) {
return new LessEqualsOperator();
} else if ("<".equals(operator)) {
return new LessOperator();
} else if (">=".equals(operator)) {
return new GreaterEqualsOperator();
} else if (">".equals(operator)) {
return new GreaterOperator();
} else if (".in(".equals(operator)) {
return new InOperator();
} else if (".isEmpty(".equals(operator)) {
return new IsEmptyOperator();
} else if (".matches(".equals(operator)) {
return new FilterOperator();
} else {
throw new RuntimeException("Invalid Operator Type: " + operator);
}
}
}