| /* |
| * 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.api.dataflow.value.ITypeTraits; |
| 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 TypeAwareTupleWriter implements ITreeIndexTupleWriter { |
| |
| protected ITypeTraits[] typeTraits; |
| protected VarLenIntEncoderDecoder encDec = new VarLenIntEncoderDecoder(); |
| |
| public TypeAwareTupleWriter(ITypeTraits[] typeTraits) { |
| this.typeTraits = typeTraits; |
| } |
| |
| @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(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 TypeAwareTupleReference(typeTraits); |
| } |
| |
| @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); |
| // write null indicator bits |
| for (int i = 0; i < nullFlagsBytes; i++) { |
| targetBuf[runner++] = (byte) 0; |
| } |
| |
| // write field slots for variable length fields |
| encDec.reset(targetBuf, runner); |
| for (int i = 0; i < tuple.getFieldCount(); i++) { |
| if (!typeTraits[i].isFixedLength()) { |
| encDec.encode(tuple.getFieldLength(i)); |
| } |
| } |
| runner = encDec.getPos(); |
| |
| // write data fields |
| for (int i = 0; i < tuple.getFieldCount(); i++) { |
| int s = tuple.getFieldStart(i); |
| int l = tuple.getFieldLength(i); |
| System.arraycopy(tuple.getFieldData(i), tuple.getFieldStart(i), targetBuf, runner, tuple.getFieldLength(i)); |
| runner += tuple.getFieldLength(i); |
| } |
| |
| return runner - targetOff; |
| } |
| |
| @Override |
| public int writeTupleFields(ITupleReference tuple, int startField, int numFields, ByteBuffer targetBuf, |
| int targetOff) { |
| int runner = targetOff; |
| int nullFlagsBytes = getNullFlagsBytes(numFields); |
| // write null indicator bits |
| for (int i = 0; i < nullFlagsBytes; i++) { |
| targetBuf.put(runner++, (byte) 0); |
| } |
| |
| // write field slots for variable length fields |
| encDec.reset(targetBuf.array(), runner); |
| for (int i = startField; i < startField + numFields; i++) { |
| if (!typeTraits[i].isFixedLength()) { |
| encDec.encode(tuple.getFieldLength(i)); |
| } |
| } |
| runner = encDec.getPos(); |
| |
| for (int i = startField; i < startField + numFields; i++) { |
| System.arraycopy(tuple.getFieldData(i), tuple.getFieldStart(i), targetBuf.array(), runner, |
| tuple.getFieldLength(i)); |
| runner += tuple.getFieldLength(i); |
| } |
| |
| return runner - targetOff; |
| } |
| |
| protected int getNullFlagsBytes(ITupleReference tuple) { |
| return (int) Math.ceil((double) tuple.getFieldCount() / 8.0); |
| } |
| |
| protected int getFieldSlotsBytes(ITupleReference tuple) { |
| int fieldSlotBytes = 0; |
| for (int i = 0; i < tuple.getFieldCount(); i++) { |
| if (!typeTraits[i].isFixedLength()) { |
| fieldSlotBytes += encDec.getBytesRequired(tuple.getFieldLength(i)); |
| } |
| } |
| return fieldSlotBytes; |
| } |
| |
| protected int getNullFlagsBytes(int numFields) { |
| return (int) Math.ceil((double) numFields / 8.0); |
| } |
| |
| protected int getFieldSlotsBytes(ITupleReference tuple, int startField, int numFields) { |
| int fieldSlotBytes = 0; |
| for (int i = startField; i < startField + numFields; i++) { |
| if (!typeTraits[i].isFixedLength()) { |
| fieldSlotBytes += encDec.getBytesRequired(tuple.getFieldLength(i)); |
| } |
| } |
| return fieldSlotBytes; |
| } |
| |
| public ITypeTraits[] getTypeTraits() { |
| return typeTraits; |
| } |
| |
| public void setTypeTraits(ITypeTraits[] typeTraits) { |
| this.typeTraits = typeTraits; |
| } |
| } |