| /* |
| * 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.storage.am.common.api.ITreeIndexFrame; |
| import edu.uci.ics.hyracks.storage.am.common.api.ITreeIndexTupleReference; |
| |
| public class SimpleTupleReference implements ITreeIndexTupleReference { |
| |
| protected ByteBuffer buf; |
| protected int fieldStartIndex; |
| protected int fieldCount; |
| protected int tupleStartOff; |
| protected int nullFlagsBytes; |
| protected int fieldSlotsBytes; |
| |
| @Override |
| public void resetByTupleOffset(ByteBuffer buf, int tupleStartOff) { |
| this.buf = buf; |
| this.tupleStartOff = tupleStartOff; |
| } |
| |
| @Override |
| public void resetByTupleIndex(ITreeIndexFrame frame, int tupleIndex) { |
| resetByTupleOffset(frame.getBuffer(), frame.getTupleOffset(tupleIndex)); |
| } |
| |
| @Override |
| public void setFieldCount(int fieldCount) { |
| this.fieldCount = fieldCount; |
| nullFlagsBytes = getNullFlagsBytes(); |
| fieldSlotsBytes = getFieldSlotsBytes(); |
| fieldStartIndex = 0; |
| } |
| |
| @Override |
| public void setFieldCount(int fieldStartIndex, int fieldCount) { |
| this.fieldCount = fieldCount; |
| this.fieldStartIndex = fieldStartIndex; |
| } |
| |
| @Override |
| public int getFieldCount() { |
| return fieldCount; |
| } |
| |
| @Override |
| public byte[] getFieldData(int fIdx) { |
| return buf.array(); |
| } |
| |
| @Override |
| public int getFieldLength(int fIdx) { |
| if (fIdx == 0) { |
| return buf.getShort(tupleStartOff + nullFlagsBytes); |
| } else { |
| return buf.getShort(tupleStartOff + nullFlagsBytes + fIdx * 2) |
| - buf.getShort(tupleStartOff + nullFlagsBytes + ((fIdx - 1) * 2)); |
| } |
| } |
| |
| @Override |
| public int getFieldStart(int fIdx) { |
| if (fIdx == 0) { |
| return tupleStartOff + nullFlagsBytes + fieldSlotsBytes; |
| } else { |
| return tupleStartOff + nullFlagsBytes + fieldSlotsBytes |
| + buf.getShort(tupleStartOff + nullFlagsBytes + ((fIdx - 1) * 2)); |
| } |
| } |
| |
| protected int getNullFlagsBytes() { |
| return (int) Math.ceil(fieldCount / 8.0); |
| } |
| |
| protected int getFieldSlotsBytes() { |
| return fieldCount * 2; |
| } |
| |
| @Override |
| public int getTupleSize() { |
| return nullFlagsBytes + fieldSlotsBytes + buf.getShort(tupleStartOff + nullFlagsBytes + (fieldCount-1) * 2); |
| } |
| } |