/**
* 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;
import org.apache.ambari.server.controller.predicate.EqualsPredicate;
import org.apache.ambari.server.controller.predicate.OrPredicate;
import org.apache.ambari.server.controller.spi.Predicate;
import java.util.ArrayList;
import java.util.List;
/**
* IN relational operator.
* This is a binary operator which takes a comma delimited right operand and
* creates equals predicates with the left operand and each right operand token.
* The equals predicates are combined with an OR predicate.
*
*/
public class InOperator extends AbstractOperator implements RelationalOperator {
public InOperator() {
super(0);
}
@Override
public String getName() {
return "InOperator";
}
@Override
public Predicate toPredicate(String prop, String val) throws InvalidQueryException {
if (val == null) {
throw new InvalidQueryException("IN operator is missing a required right operand.");
}
String[] tokens = val.split(",");
List<EqualsPredicate> listPredicates = new ArrayList<EqualsPredicate>();
for (String token : tokens) {
listPredicates.add(new EqualsPredicate(prop, token.trim()));
}
return listPredicates.size() == 1 ? listPredicates.get(0) :
buildOrPredicate(listPredicates);
}
private OrPredicate buildOrPredicate(List<EqualsPredicate> listPredicates) {
return new OrPredicate(listPredicates.toArray(new Predicate[listPredicates.size()]));
}
@Override
public TYPE getType() {
return TYPE.IN;
}
}