| /* |
| * Copyright 2009-2010 by The Regents of the University of California |
| * Licensed 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 from |
| * |
| * 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 edu.uci.ics.hyracks.storage.am.common.tuples; |
| |
| import java.nio.ByteBuffer; |
| |
| import edu.uci.ics.hyracks.dataflow.common.data.accessors.ITupleReference; |
| import edu.uci.ics.hyracks.storage.am.common.api.ITreeIndexTupleReference; |
| import edu.uci.ics.hyracks.storage.am.common.api.ITreeIndexTupleWriter; |
| |
| public class SimpleTupleWriter implements ITreeIndexTupleWriter { |
| |
| // Write short in little endian to target byte array at given offset. |
| private static void writeShortL(short s, byte[] buf, int targetOff) { |
| buf[targetOff] = (byte) (s >> 8); |
| buf[targetOff + 1] = (byte) (s >> 0); |
| } |
| |
| @Override |
| public int bytesRequired(ITupleReference tuple) { |
| int bytes = getNullFlagsBytes(tuple) + getFieldSlotsBytes(tuple); |
| for (int i = 0; i < tuple.getFieldCount(); i++) { |
| bytes += tuple.getFieldLength(i); |
| } |
| return bytes; |
| } |
| |
| @Override |
| public int bytesRequired(ITupleReference tuple, int startField, int numFields) { |
| int bytes = getNullFlagsBytes(tuple, startField, numFields) + getFieldSlotsBytes(tuple, startField, numFields); |
| for (int i = startField; i < startField + numFields; i++) { |
| bytes += tuple.getFieldLength(i); |
| } |
| return bytes; |
| } |
| |
| @Override |
| public ITreeIndexTupleReference createTupleReference() { |
| return new SimpleTupleReference(); |
| } |
| |
| @Override |
| public int writeTuple(ITupleReference tuple, ByteBuffer targetBuf, int targetOff) { |
| return writeTuple(tuple, targetBuf.array(), targetOff); |
| } |
| |
| @Override |
| public int writeTuple(ITupleReference tuple, byte[] targetBuf, int targetOff) { |
| int runner = targetOff; |
| int nullFlagsBytes = getNullFlagsBytes(tuple); |
| int fieldSlotsBytes = getFieldSlotsBytes(tuple); |
| for (int i = 0; i < nullFlagsBytes; i++) { |
| targetBuf[runner++] = (byte) 0; |
| } |
| runner += fieldSlotsBytes; |
| int fieldEndOff = 0; |
| for (int i = 0; i < tuple.getFieldCount(); i++) { |
| System.arraycopy(tuple.getFieldData(i), tuple.getFieldStart(i), targetBuf, runner, tuple.getFieldLength(i)); |
| fieldEndOff += tuple.getFieldLength(i); |
| runner += tuple.getFieldLength(i); |
| writeShortL((short) fieldEndOff, targetBuf, targetOff + nullFlagsBytes + i * 2); |
| } |
| return runner - targetOff; |
| } |
| |
| @Override |
| public int writeTupleFields(ITupleReference tuple, int startField, int numFields, byte[] targetBuf, int targetOff) { |
| int runner = targetOff; |
| int nullFlagsBytes = getNullFlagsBytes(tuple, startField, numFields); |
| for (int i = 0; i < nullFlagsBytes; i++) { |
| targetBuf[runner++] = (byte) 0; |
| } |
| runner += getFieldSlotsBytes(tuple, startField, numFields); |
| |
| int fieldEndOff = 0; |
| int fieldCounter = 0; |
| for (int i = startField; i < startField + numFields; i++) { |
| System.arraycopy(tuple.getFieldData(i), tuple.getFieldStart(i), targetBuf, runner, tuple.getFieldLength(i)); |
| fieldEndOff += tuple.getFieldLength(i); |
| runner += tuple.getFieldLength(i); |
| writeShortL((short) fieldEndOff, targetBuf, targetOff + nullFlagsBytes + fieldCounter * 2); |
| fieldCounter++; |
| } |
| |
| return runner - targetOff; |
| } |
| |
| protected int getNullFlagsBytes(ITupleReference tuple) { |
| return (int) Math.ceil((double) tuple.getFieldCount() / 8.0); |
| } |
| |
| protected int getFieldSlotsBytes(ITupleReference tuple) { |
| return tuple.getFieldCount() * 2; |
| } |
| |
| protected int getNullFlagsBytes(ITupleReference tuple, int startField, int numFields) { |
| return (int) Math.ceil((double) numFields / 8.0); |
| } |
| |
| protected int getFieldSlotsBytes(ITupleReference tuple, int startField, int numFields) { |
| return numFields * 2; |
| } |
| |
| @Override |
| public int getCopySpaceRequired(ITupleReference tuple) { |
| return bytesRequired(tuple); |
| } |
| } |