hyracks-storage-am-btree/src/main/java/edu/uci/ics/hyracks/storage/am/btree/dataflow/BTreeDataflowHelper.java

/*
 * 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.btree.dataflow;

import edu.uci.ics.hyracks.api.context.IHyracksTaskContext;
import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
import edu.uci.ics.hyracks.storage.am.btree.impls.BTree;
import edu.uci.ics.hyracks.storage.am.common.api.IFreePageManager;
import edu.uci.ics.hyracks.storage.am.common.api.ITreeIndex;
import edu.uci.ics.hyracks.storage.am.common.api.ITreeIndexMetaDataFrameFactory;
import edu.uci.ics.hyracks.storage.am.common.dataflow.IIndexOperatorDescriptor;
import edu.uci.ics.hyracks.storage.am.common.dataflow.TreeIndexDataflowHelper;
import edu.uci.ics.hyracks.storage.am.common.frames.LIFOMetaDataFrameFactory;
import edu.uci.ics.hyracks.storage.am.common.freepage.LinkedListFreePageManager;
import edu.uci.ics.hyracks.storage.am.common.ophelpers.MultiComparator;
import edu.uci.ics.hyracks.storage.am.common.util.IndexUtils;
import edu.uci.ics.hyracks.storage.common.buffercache.IBufferCache;

public class BTreeDataflowHelper extends TreeIndexDataflowHelper {
    public BTreeDataflowHelper(IIndexOperatorDescriptor opDesc, IHyracksTaskContext ctx, int partition,
            boolean createIfNotExists) {
        super(opDesc, ctx, partition, createIfNotExists);
    }
    
    @Override
    public ITreeIndex createIndexInstance() throws HyracksDataException {
        MultiComparator cmp = IndexUtils.createMultiComparator(treeOpDesc.getTreeIndexComparatorFactories());
        IBufferCache bufferCache = opDesc.getStorageManager().getBufferCache(ctx);
        ITreeIndexMetaDataFrameFactory metaDataFrameFactory = new LIFOMetaDataFrameFactory();
        IFreePageManager freePageManager = new LinkedListFreePageManager(bufferCache, indexFileId, 0,
                metaDataFrameFactory);
        return new BTree(bufferCache, treeOpDesc.getTreeIndexTypeTraits().length, cmp, freePageManager,
                treeOpDesc.getTreeIndexInteriorFactory(), treeOpDesc.getTreeIndexLeafFactory());
    }
}