kafka Table 源码
kafka Table 代码
文件路径：/connect/runtime/src/main/java/org/apache/kafka/connect/util/Table.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.connect.util;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
public class Table<R, C, V> {
private final Map<R, Map<C, V>> table = new HashMap<>();
public V put(R row, C column, V value) {
Map<C, V> columns = table.computeIfAbsent(row, k -> new HashMap<>());
return columns.put(column, value);
}
public V get(R row, C column) {
Map<C, V> columns = table.get(row);
if (columns == null)
return null;
return columns.get(column);
}
public Map<C, V> remove(R row) {
return table.remove(row);
}
public V remove(R row, C column) {
Map<C, V> columns = table.get(row);
if (columns == null)
return null;
V value = columns.remove(column);
if (columns.isEmpty())
table.remove(row);
return value;
}
public Map<C, V> row(R row) {
Map<C, V> columns = table.get(row);
if (columns == null)
return Collections.emptyMap();
return Collections.unmodifiableMap(columns);
}
public boolean isEmpty() {
return table.isEmpty();
}
}
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