/*
* 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.geode.cache.query.internal;
import java.util.Comparator;
import org.apache.geode.cache.query.SelectResults;
/**
* Comparator used by the sorted set for storing the results obtained from evaluation of various
* filter operands in an increasing order of the size , which will ensure that the intersection of
* the results for evaluation of AND junction is optimum in performance.
*
*/
class SelectResultsComparator implements Comparator {
/**
* Sort the array in ascending order of collection sizes.
*/
public int compare(Object obj1, Object obj2) {
if (!(obj1 instanceof SelectResults) || !(obj2 instanceof SelectResults)) {
Support.assertionFailed("The objects need to be of type SelectResults");
}
int answer = -1;
SelectResults sr1 = (SelectResults) obj1;
SelectResults sr2 = (SelectResults) obj2;
int sizeDifference = sr1.size() - sr2.size();
if (obj1 == obj2) {
answer = 0;
} else if (sizeDifference > 0) {
answer = 1;
}
return answer;
}
/**
* Overwrite default equals implementation.
*/
@Override
public boolean equals(Object o1) {
return this == o1;
}
}