| /* |
| * 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.cassandra.io.sstable.format.bti; |
| |
| import java.io.Closeable; |
| import java.io.IOException; |
| import java.util.Collection; |
| import java.util.Iterator; |
| |
| import com.google.common.collect.Iterators; |
| |
| import org.apache.cassandra.db.DataRange; |
| import org.apache.cassandra.db.DecoratedKey; |
| import org.apache.cassandra.db.PartitionPosition; |
| import org.apache.cassandra.db.filter.ClusteringIndexFilter; |
| import org.apache.cassandra.db.filter.ColumnFilter; |
| import org.apache.cassandra.db.rows.UnfilteredRowIterator; |
| import org.apache.cassandra.dht.AbstractBounds; |
| import org.apache.cassandra.dht.Range; |
| import org.apache.cassandra.dht.Token; |
| import org.apache.cassandra.io.sstable.SSTableReadsListener; |
| import org.apache.cassandra.io.sstable.format.SSTableScanner; |
| import org.apache.cassandra.io.util.FileUtils; |
| |
| public class BtiTableScanner extends SSTableScanner<BtiTableReader, TrieIndexEntry, BtiTableScanner.BtiScanningIterator> |
| { |
| // Full scan of the sstables |
| public static BtiTableScanner getScanner(BtiTableReader sstable) |
| { |
| return getScanner(sstable, Iterators.singletonIterator(fullRange(sstable))); |
| } |
| |
| public static BtiTableScanner getScanner(BtiTableReader sstable, |
| ColumnFilter columns, |
| DataRange dataRange, |
| SSTableReadsListener listener) |
| { |
| return new BtiTableScanner(sstable, columns, dataRange, makeBounds(sstable, dataRange).iterator(), listener); |
| } |
| |
| public static BtiTableScanner getScanner(BtiTableReader sstable, Collection<Range<Token>> tokenRanges) |
| { |
| return getScanner(sstable, makeBounds(sstable, tokenRanges).iterator()); |
| } |
| |
| public static BtiTableScanner getScanner(BtiTableReader sstable, Iterator<AbstractBounds<PartitionPosition>> rangeIterator) |
| { |
| return new BtiTableScanner(sstable, ColumnFilter.all(sstable.metadata()), null, rangeIterator, SSTableReadsListener.NOOP_LISTENER); |
| } |
| |
| private BtiTableScanner(BtiTableReader sstable, |
| ColumnFilter columns, |
| DataRange dataRange, |
| Iterator<AbstractBounds<PartitionPosition>> rangeIterator, |
| SSTableReadsListener listener) |
| { |
| super(sstable, columns, dataRange, rangeIterator, listener); |
| } |
| |
| protected void doClose() throws IOException |
| { |
| FileUtils.close(dfile, iterator); |
| } |
| |
| @Override |
| protected BtiScanningIterator doCreateIterator() |
| { |
| return new BtiScanningIterator(); |
| } |
| |
| protected class BtiScanningIterator extends SSTableScanner<BtiTableReader, TrieIndexEntry, BtiTableScanner.BtiScanningIterator>.BaseKeyScanningIterator implements Closeable |
| { |
| private PartitionIterator iterator; |
| |
| @Override |
| protected boolean prepareToIterateRow() throws IOException |
| { |
| while (true) |
| { |
| if (startScan != -1) |
| bytesScanned += getCurrentPosition() - startScan; |
| |
| if (iterator != null) |
| { |
| currentEntry = iterator.entry(); |
| currentKey = iterator.decoratedKey(); |
| if (currentEntry != null) |
| { |
| iterator.advance(); |
| return true; |
| } |
| iterator.close(); |
| iterator = null; |
| } |
| |
| // try next range |
| if (!rangeIterator.hasNext()) |
| return false; |
| iterator = sstable.coveredKeysIterator(rangeIterator.next()); |
| } |
| } |
| |
| @Override |
| protected UnfilteredRowIterator getRowIterator(TrieIndexEntry indexEntry, DecoratedKey key) |
| { |
| if (dataRange == null) |
| { |
| return sstable.simpleIterator(dfile, key, indexEntry.position, false); |
| } |
| else |
| { |
| ClusteringIndexFilter filter = dataRange.clusteringIndexFilter(key); |
| return sstable.rowIterator(dfile, key, indexEntry, filter.getSlices(BtiTableScanner.this.metadata()), columns, filter.isReversed()); |
| } |
| } |
| |
| @Override |
| public void close() |
| { |
| super.close(); // can't throw |
| if (iterator != null) |
| iterator.close(); |
| } |
| } |
| } |