| /* |
| * 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.frames; |
| |
| import edu.uci.ics.hyracks.storage.am.common.api.ISlotManager; |
| import edu.uci.ics.hyracks.storage.am.common.api.ITreeIndexFrame; |
| |
| public abstract class AbstractSlotManager implements ISlotManager { |
| |
| protected final int GREATEST_KEY_INDICATOR = -1; |
| protected final int ERROR_INDICATOR = -2; |
| |
| protected static final int slotSize = 4; |
| protected ITreeIndexFrame frame; |
| |
| @Override |
| public int getTupleOff(int offset) { |
| return frame.getBuffer().getInt(offset); |
| } |
| |
| @Override |
| public void setSlot(int offset, int value) { |
| frame.getBuffer().putInt(offset, value); |
| } |
| |
| @Override |
| public int getSlotEndOff() { |
| return frame.getBuffer().capacity() |
| - (frame.getTupleCount() * slotSize); |
| } |
| |
| @Override |
| public int getSlotStartOff() { |
| return frame.getBuffer().capacity() - slotSize; |
| } |
| |
| @Override |
| public int getSlotSize() { |
| return slotSize; |
| } |
| |
| @Override |
| public void setFrame(ITreeIndexFrame frame) { |
| this.frame = frame; |
| } |
| |
| @Override |
| public int getSlotOff(int tupleIndex) { |
| return getSlotStartOff() - tupleIndex * slotSize; |
| } |
| |
| @Override |
| public int getGreatestKeyIndicator() { |
| return GREATEST_KEY_INDICATOR; |
| } |
| |
| @Override |
| public int getErrorIndicator() { |
| return ERROR_INDICATOR; |
| } |
| } |