001/* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, software 013 * distributed under the License is distributed on an "AS IS" BASIS, 014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018package org.apache.hadoop.hbase.client; 019 020import java.io.IOException; 021import java.util.Objects; 022import org.apache.hadoop.hbase.Cell; 023import org.apache.hadoop.hbase.exceptions.DeserializationException; 024import org.apache.hadoop.hbase.filter.FilterBase; 025import org.apache.hadoop.hbase.util.Bytes; 026import org.apache.yetus.audience.InterfaceAudience; 027 028@InterfaceAudience.Private 029public final class ColumnCountOnRowFilter extends FilterBase { 030 031 private final int limit; 032 033 private int count = 0; 034 035 public ColumnCountOnRowFilter(int limit) { 036 this.limit = limit; 037 } 038 039 @Override 040 public ReturnCode filterCell(final Cell c) { 041 count++; 042 return count > limit ? ReturnCode.NEXT_ROW : ReturnCode.INCLUDE; 043 } 044 045 @Override 046 public void reset() throws IOException { 047 this.count = 0; 048 } 049 050 @Override 051 public byte[] toByteArray() throws IOException { 052 return Bytes.toBytes(limit); 053 } 054 055 public static ColumnCountOnRowFilter parseFrom(byte[] bytes) throws DeserializationException { 056 return new ColumnCountOnRowFilter(Bytes.toInt(bytes)); 057 } 058 059 @Override 060 public boolean equals(Object obj) { 061 if (!(obj instanceof ColumnCountOnRowFilter)) { 062 return false; 063 } 064 if (this == obj) { 065 return true; 066 } 067 ColumnCountOnRowFilter f = (ColumnCountOnRowFilter) obj; 068 return this.limit == f.limit; 069 } 070 071 @Override 072 public int hashCode() { 073 return Objects.hash(this.limit); 074 } 075}