| /* |
| * 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.lsm.btree.impls; |
| |
| import edu.uci.ics.hyracks.api.exceptions.HyracksDataException; |
| import edu.uci.ics.hyracks.dataflow.common.data.accessors.ITupleReference; |
| import edu.uci.ics.hyracks.storage.am.btree.impls.RangePredicate; |
| import edu.uci.ics.hyracks.storage.am.common.api.ICursorInitialState; |
| import edu.uci.ics.hyracks.storage.am.common.api.ISearchPredicate; |
| import edu.uci.ics.hyracks.storage.am.common.api.ITreeIndexCursor; |
| import edu.uci.ics.hyracks.storage.am.common.api.IndexException; |
| import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIndexOperationContext; |
| import edu.uci.ics.hyracks.storage.common.buffercache.IBufferCache; |
| import edu.uci.ics.hyracks.storage.common.buffercache.ICachedPage; |
| |
| public class LSMBTreeSearchCursor implements ITreeIndexCursor { |
| |
| public enum LSMBTreeSearchType { |
| POINT, |
| RANGE |
| } |
| |
| private final LSMBTreePointSearchCursor pointCursor; |
| private final LSMBTreeRangeSearchCursor rangeCursor; |
| private ITreeIndexCursor currentCursor; |
| |
| public LSMBTreeSearchCursor(ILSMIndexOperationContext opCtx) { |
| pointCursor = new LSMBTreePointSearchCursor(opCtx); |
| rangeCursor = new LSMBTreeRangeSearchCursor(opCtx); |
| } |
| |
| @Override |
| public void open(ICursorInitialState initialState, ISearchPredicate searchPred) throws IndexException, |
| HyracksDataException { |
| |
| LSMBTreeCursorInitialState lsmInitialState = (LSMBTreeCursorInitialState) initialState; |
| |
| LSMBTreeSearchType searchType = LSMBTreeSearchType.RANGE; |
| RangePredicate btreePred = (RangePredicate) searchPred; |
| if (btreePred.getLowKey() != null && btreePred.getHighKey() != null) { |
| if (btreePred.isLowKeyInclusive() && btreePred.isHighKeyInclusive()) { |
| if (btreePred.getLowKeyComparator().getKeyFieldCount() == btreePred.getHighKeyComparator() |
| .getKeyFieldCount()) { |
| if (btreePred.getLowKeyComparator().getKeyFieldCount() == lsmInitialState |
| .getOriginalKeyComparator().getKeyFieldCount()) { |
| if (lsmInitialState.getOriginalKeyComparator().compare(btreePred.getLowKey(), |
| btreePred.getHighKey()) == 0) { |
| searchType = LSMBTreeSearchType.POINT; |
| } |
| } |
| } |
| } |
| } |
| switch (searchType) { |
| case POINT: |
| currentCursor = pointCursor; |
| break; |
| case RANGE: |
| currentCursor = rangeCursor; |
| break; |
| default: |
| throw new HyracksDataException("Wrong search type"); |
| } |
| currentCursor.open(lsmInitialState, searchPred); |
| } |
| |
| @Override |
| public boolean hasNext() throws HyracksDataException, IndexException { |
| return currentCursor.hasNext(); |
| } |
| |
| @Override |
| public void next() throws HyracksDataException { |
| currentCursor.next(); |
| } |
| |
| @Override |
| public void close() throws HyracksDataException { |
| if (currentCursor != null) { |
| currentCursor.close(); |
| } |
| currentCursor = null; |
| } |
| |
| @Override |
| public void reset() throws HyracksDataException, IndexException { |
| if (currentCursor != null) { |
| currentCursor.reset(); |
| } |
| currentCursor = null; |
| } |
| |
| @Override |
| public ITupleReference getTuple() { |
| return currentCursor.getTuple(); |
| } |
| |
| @Override |
| public ICachedPage getPage() { |
| return currentCursor.getPage(); |
| } |
| |
| @Override |
| public void setBufferCache(IBufferCache bufferCache) { |
| currentCursor.setBufferCache(bufferCache); |
| } |
| |
| @Override |
| public void setFileId(int fileId) { |
| currentCursor.setFileId(fileId); |
| |
| } |
| |
| @Override |
| public boolean exclusiveLatchNodes() { |
| return currentCursor.exclusiveLatchNodes(); |
| } |
| |
| } |