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.types; 019 020import com.google.protobuf.CodedInputStream; 021import com.google.protobuf.CodedOutputStream; 022import java.io.IOException; 023import org.apache.hadoop.hbase.protobuf.generated.CellProtos; 024import org.apache.hadoop.hbase.util.PositionedByteRange; 025import org.apache.yetus.audience.InterfaceAudience; 026 027/** 028 * An example for using protobuf objects with {@link DataType} API. 029 */ 030@InterfaceAudience.Private 031public class PBCell extends PBType<CellProtos.Cell> { 032 @Override 033 public Class<CellProtos.Cell> encodedClass() { 034 return CellProtos.Cell.class; 035 } 036 037 @Override 038 public int skip(PositionedByteRange src) { 039 CellProtos.Cell.Builder builder = CellProtos.Cell.newBuilder(); 040 CodedInputStream is = inputStreamFromByteRange(src); 041 is.setSizeLimit(src.getLength()); 042 try { 043 builder.mergeFrom(is); 044 int consumed = is.getTotalBytesRead(); 045 src.setPosition(src.getPosition() + consumed); 046 return consumed; 047 } catch (IOException e) { 048 throw new RuntimeException("Error while skipping type.", e); 049 } 050 } 051 052 @Override 053 public CellProtos.Cell decode(PositionedByteRange src) { 054 CellProtos.Cell.Builder builder = CellProtos.Cell.newBuilder(); 055 CodedInputStream is = inputStreamFromByteRange(src); 056 is.setSizeLimit(src.getLength()); 057 try { 058 CellProtos.Cell ret = builder.mergeFrom(is).build(); 059 src.setPosition(src.getPosition() + is.getTotalBytesRead()); 060 return ret; 061 } catch (IOException e) { 062 throw new RuntimeException("Error while decoding type.", e); 063 } 064 } 065 066 @Override 067 public int encode(PositionedByteRange dst, CellProtos.Cell val) { 068 CodedOutputStream os = outputStreamFromByteRange(dst); 069 try { 070 int before = os.spaceLeft(), after, written; 071 val.writeTo(os); 072 after = os.spaceLeft(); 073 written = before - after; 074 dst.setPosition(dst.getPosition() + written); 075 return written; 076 } catch (IOException e) { 077 throw new RuntimeException("Error while encoding type.", e); 078 } 079 } 080}