| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 at |
| * |
| * 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 org.apache.hyracks.storage.am.lsm.invertedindex.ondisk; |
| |
| import org.apache.hyracks.api.exceptions.HyracksDataException; |
| import org.apache.hyracks.dataflow.common.data.accessors.ITupleReference; |
| import org.apache.hyracks.storage.am.lsm.invertedindex.api.IInvertedIndexSearcher; |
| import org.apache.hyracks.storage.common.EnforcedIndexCursor; |
| import org.apache.hyracks.storage.common.ICursorInitialState; |
| import org.apache.hyracks.storage.common.ISearchPredicate; |
| |
| /** |
| * A search cursor that fetches the result from an IInvertedIndexSearcher instance. |
| */ |
| public class OnDiskInvertedIndexSearchCursor extends EnforcedIndexCursor { |
| |
| private final IInvertedIndexSearcher invIndexSearcher; |
| |
| public OnDiskInvertedIndexSearchCursor(IInvertedIndexSearcher invIndexSearcher) { |
| this.invIndexSearcher = invIndexSearcher; |
| } |
| |
| @Override |
| public void doOpen(ICursorInitialState initialState, ISearchPredicate searchPred) throws HyracksDataException { |
| // No-op for this cursor since all necessary information is already set in the given searcher. |
| // This class is just a wrapper. |
| } |
| |
| @Override |
| public boolean doHasNext() throws HyracksDataException { |
| return invIndexSearcher.hasNext(); |
| } |
| |
| @Override |
| public void doNext() throws HyracksDataException { |
| invIndexSearcher.next(); |
| } |
| |
| @Override |
| public ITupleReference doGetTuple() { |
| return invIndexSearcher.getTuple(); |
| } |
| |
| @Override |
| public void doClose() throws HyracksDataException { |
| doDestroy(); |
| } |
| |
| @Override |
| public void doDestroy() throws HyracksDataException { |
| if (invIndexSearcher != null) { |
| invIndexSearcher.destroy(); |
| } |
| } |
| |
| } |