content: /*
   * 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();
      }
  }
  