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/*
* 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();
}
}
}