kafka OptionalStringComparator 源码
kafka OptionalStringComparator 代码
文件路径：/metadata/src/main/java/org/apache/kafka/metadata/OptionalStringComparator.java
/*
* 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.kafka.metadata;
import java.util.Comparator;
import java.util.Optional;
public class OptionalStringComparator implements Comparator<Optional<String>> {
public static final OptionalStringComparator INSTANCE = new OptionalStringComparator();
@Override
public int compare(Optional<String> a, Optional<String> b) {
if (!a.isPresent()) {
if (!b.isPresent()) {
return 0;
} else {
return -1;
}
} else if (!b.isPresent()) {
return 1;
}
return a.get().compareTo(b.get());
}
}
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