| /* |
| * 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; |
| |
| import java.io.IOException; |
| import java.io.IOError; |
| import java.util.Iterator; |
| |
| import org.apache.cassandra.io.util.RewindableDataInput; |
| import org.apache.cassandra.utils.AbstractIterator; |
| |
| import org.apache.cassandra.config.CFMetaData; |
| import org.apache.cassandra.config.ColumnDefinition; |
| import org.apache.cassandra.db.*; |
| import org.apache.cassandra.db.rows.*; |
| import org.apache.cassandra.io.util.DataInputPlus; |
| import org.apache.cassandra.io.util.FileDataInput; |
| import org.apache.cassandra.io.util.DataPosition; |
| import org.apache.cassandra.net.MessagingService; |
| |
| /** |
| * Utility class to handle deserializing atom from sstables. |
| * |
| * Note that this is not a full fledged UnfilteredRowIterator. It's also not closeable, it is always |
| * the job of the user to close the underlying ressources. |
| */ |
| public abstract class SSTableSimpleIterator extends AbstractIterator<Unfiltered> implements Iterator<Unfiltered> |
| { |
| protected final CFMetaData metadata; |
| protected final DataInputPlus in; |
| protected final SerializationHelper helper; |
| |
| private SSTableSimpleIterator(CFMetaData metadata, DataInputPlus in, SerializationHelper helper) |
| { |
| this.metadata = metadata; |
| this.in = in; |
| this.helper = helper; |
| } |
| |
| public static SSTableSimpleIterator create(CFMetaData metadata, DataInputPlus in, SerializationHeader header, SerializationHelper helper, DeletionTime partitionDeletion) |
| { |
| if (helper.version < MessagingService.VERSION_30) |
| return new OldFormatIterator(metadata, in, helper, partitionDeletion); |
| else |
| return new CurrentFormatIterator(metadata, in, header, helper); |
| } |
| |
| public abstract Row readStaticRow() throws IOException; |
| |
| private static class CurrentFormatIterator extends SSTableSimpleIterator |
| { |
| private final SerializationHeader header; |
| |
| private final Row.Builder builder; |
| |
| private CurrentFormatIterator(CFMetaData metadata, DataInputPlus in, SerializationHeader header, SerializationHelper helper) |
| { |
| super(metadata, in, helper); |
| this.header = header; |
| this.builder = BTreeRow.sortedBuilder(); |
| } |
| |
| public Row readStaticRow() throws IOException |
| { |
| return header.hasStatic() ? UnfilteredSerializer.serializer.deserializeStaticRow(in, header, helper) : Rows.EMPTY_STATIC_ROW; |
| } |
| |
| protected Unfiltered computeNext() |
| { |
| try |
| { |
| Unfiltered unfiltered = UnfilteredSerializer.serializer.deserialize(in, header, helper, builder); |
| return unfiltered == null ? endOfData() : unfiltered; |
| } |
| catch (IOException e) |
| { |
| throw new IOError(e); |
| } |
| } |
| } |
| |
| private static class OldFormatIterator extends SSTableSimpleIterator |
| { |
| private final UnfilteredDeserializer deserializer; |
| |
| private OldFormatIterator(CFMetaData metadata, DataInputPlus in, SerializationHelper helper, DeletionTime partitionDeletion) |
| { |
| super(metadata, in, helper); |
| // We use an UnfilteredDeserializer because even though we don't need all it's fanciness, it happens to handle all |
| // the details we need for reading the old format. |
| this.deserializer = UnfilteredDeserializer.create(metadata, in, null, helper, partitionDeletion, false); |
| } |
| |
| public Row readStaticRow() throws IOException |
| { |
| if (metadata.isCompactTable()) |
| { |
| // For static compact tables, in the old format, static columns are intermingled with the other columns, so we |
| // need to extract them. Which imply 2 passes (one to extract the static, then one for other value). |
| if (metadata.isStaticCompactTable()) |
| { |
| assert in instanceof RewindableDataInput; |
| RewindableDataInput file = (RewindableDataInput)in; |
| DataPosition mark = file.mark(); |
| Row staticRow = LegacyLayout.extractStaticColumns(metadata, file, metadata.partitionColumns().statics); |
| file.reset(mark); |
| |
| // We've extracted the static columns, so we must ignore them on the 2nd pass |
| ((UnfilteredDeserializer.OldFormatDeserializer)deserializer).setSkipStatic(); |
| return staticRow; |
| } |
| else |
| { |
| return Rows.EMPTY_STATIC_ROW; |
| } |
| } |
| |
| return deserializer.hasNext() && deserializer.nextIsStatic() |
| ? (Row)deserializer.readNext() |
| : Rows.EMPTY_STATIC_ROW; |
| |
| } |
| |
| protected Unfiltered computeNext() |
| { |
| try |
| { |
| if (!deserializer.hasNext()) |
| return endOfData(); |
| |
| Unfiltered unfiltered = deserializer.readNext(); |
| if (metadata.isStaticCompactTable() && unfiltered.kind() == Unfiltered.Kind.ROW) |
| { |
| Row row = (Row) unfiltered; |
| ColumnDefinition def = metadata.getColumnDefinition(LegacyLayout.encodeClustering(metadata, row.clustering())); |
| if (def != null && def.isStatic()) |
| return computeNext(); |
| } |
| return unfiltered; |
| } |
| catch (IOException e) |
| { |
| throw new IOError(e); |
| } |
| } |
| |
| } |
| |
| } |