| /* |
| * 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.IOException; |
| |
| import org.apache.cassandra.db.DecoratedKey; |
| import org.apache.cassandra.db.Slice; |
| import org.apache.cassandra.db.Slices; |
| import org.apache.cassandra.db.filter.ColumnFilter; |
| import org.apache.cassandra.io.sstable.AbstractRowIndexEntry; |
| import org.apache.cassandra.io.sstable.AbstractSSTableIterator; |
| import org.apache.cassandra.io.sstable.format.bti.RowIndexReader.IndexInfo; |
| import org.apache.cassandra.io.util.FileDataInput; |
| import org.apache.cassandra.io.util.FileHandle; |
| |
| /** |
| * Unfiltered row iterator over a BTI SSTable. |
| */ |
| class SSTableIterator extends AbstractSSTableIterator<AbstractRowIndexEntry> |
| { |
| /** |
| * The index of the slice being processed. |
| */ |
| private int slice; |
| |
| public SSTableIterator(BtiTableReader sstable, |
| FileDataInput file, |
| DecoratedKey key, |
| AbstractRowIndexEntry indexEntry, |
| Slices slices, |
| ColumnFilter columns, |
| FileHandle ifile) |
| { |
| super(sstable, file, key, indexEntry, slices, columns, ifile); |
| } |
| |
| protected Reader createReaderInternal(AbstractRowIndexEntry indexEntry, FileDataInput file, boolean shouldCloseFile) |
| { |
| if (indexEntry.isIndexed()) |
| return new ForwardIndexedReader(indexEntry, file, shouldCloseFile); |
| else |
| return new ForwardReader(file, shouldCloseFile); |
| } |
| |
| protected int nextSliceIndex() |
| { |
| int next = slice; |
| slice++; |
| return next; |
| } |
| |
| protected boolean hasMoreSlices() |
| { |
| return slice < slices.size(); |
| } |
| |
| public boolean isReverseOrder() |
| { |
| return false; |
| } |
| |
| private class ForwardIndexedReader extends ForwardReader |
| { |
| private final RowIndexReader indexReader; |
| private final long basePosition; |
| |
| private ForwardIndexedReader(AbstractRowIndexEntry indexEntry, FileDataInput file, boolean shouldCloseFile) |
| { |
| super(file, shouldCloseFile); |
| basePosition = indexEntry.position; |
| indexReader = new RowIndexReader(ifile, (TrieIndexEntry) indexEntry); |
| } |
| |
| @Override |
| public void close() throws IOException |
| { |
| indexReader.close(); |
| super.close(); |
| } |
| |
| @Override |
| public void setForSlice(Slice slice) throws IOException |
| { |
| super.setForSlice(slice); |
| IndexInfo indexInfo = indexReader.separatorFloor(metadata.comparator.asByteComparable(slice.start())); |
| assert indexInfo != null; |
| long position = basePosition + indexInfo.offset; |
| if (file == null || position > file.getFilePointer()) |
| { |
| openMarker = indexInfo.openDeletion; |
| seekToPosition(position); |
| } |
| // Otherwise we are already in the relevant index block, there is no point to go back to its beginning. |
| } |
| } |
| } |