kafka TopicCollection 源码
kafka TopicCollection 代码
文件路径：/clients/src/main/java/org/apache/kafka/common/TopicCollection.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.common;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
/**
* A class used to represent a collection of topics. This collection may define topics by name or ID.
*/
public abstract class TopicCollection {
private TopicCollection() {}
/**
* @return a collection of topics defined by topic ID
*/
public static TopicIdCollection ofTopicIds(Collection<Uuid> topics) {
return new TopicIdCollection(topics);
}
/**
* @return a collection of topics defined by topic name
*/
public static TopicNameCollection ofTopicNames(Collection<String> topics) {
return new TopicNameCollection(topics);
}
/**
* A class used to represent a collection of topics defined by their topic ID.
* Subclassing this class beyond the classes provided here is not supported.
*/
public static class TopicIdCollection extends TopicCollection {
private final Collection<Uuid> topicIds;
private TopicIdCollection(Collection<Uuid> topicIds) {
this.topicIds = new ArrayList<>(topicIds);
}
/**
* @return A collection of topic IDs
*/
public Collection<Uuid> topicIds() {
return Collections.unmodifiableCollection(topicIds);
}
}
/**
* A class used to represent a collection of topics defined by their topic name.
* Subclassing this class beyond the classes provided here is not supported.
*/
public static class TopicNameCollection extends TopicCollection {
private final Collection<String> topicNames;
private TopicNameCollection(Collection<String> topicNames) {
this.topicNames = new ArrayList<>(topicNames);
}
/**
* @return A collection of topic names
*/
public Collection<String> topicNames() {
return Collections.unmodifiableCollection(topicNames);
}
}
}
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