/**
    * 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.hadoop.hbase.client;
  
  import java.io.IOException;
  import java.util.Objects;
  
  import org.apache.hadoop.hbase.Cell;
  import org.apache.hadoop.hbase.classification.InterfaceAudience;
  import org.apache.hadoop.hbase.exceptions.DeserializationException;
  import org.apache.hadoop.hbase.filter.FilterBase;
  import org.apache.hadoop.hbase.util.Bytes;
  
  @InterfaceAudience.Private
  public final class ColumnCountOnRowFilter extends FilterBase {
  
    private final int limit;
  
    private int count = 0;
  
    public ColumnCountOnRowFilter(int limit) {
      this.limit = limit;
    }
  
    @Override
    public ReturnCode filterKeyValue(Cell v) throws IOException {
      count++;
      return count > limit ? ReturnCode.NEXT_ROW : ReturnCode.INCLUDE;
    }
  
    @Override
    public void reset() throws IOException {
      this.count = 0;
    }
  
    @Override
    public byte[] toByteArray() throws IOException {
      return Bytes.toBytes(limit);
    }
  
    public static ColumnCountOnRowFilter parseFrom(byte[] bytes) throws DeserializationException {
      return new ColumnCountOnRowFilter(Bytes.toInt(bytes));
    }
  
    @Override
    public boolean equals(Object obj) {
      if (!(obj instanceof ColumnCountOnRowFilter)) {
        return false;
      }
      if (this == obj) {
        return true;
      }
      ColumnCountOnRowFilter f = (ColumnCountOnRowFilter) obj;
      return this.limit == f.limit;
    }
  
    @Override
    public int hashCode() {
      return Objects.hash(this.limit);
    }
  }