| /* |
| * 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.db.index.composites; |
| |
| import java.nio.ByteBuffer; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.apache.cassandra.config.CFMetaData; |
| import org.apache.cassandra.config.ColumnDefinition; |
| import org.apache.cassandra.db.*; |
| import org.apache.cassandra.db.composites.*; |
| import org.apache.cassandra.db.index.SecondaryIndex; |
| import org.apache.cassandra.db.marshal.*; |
| import org.apache.cassandra.utils.concurrent.OpOrder; |
| |
| /** |
| * Index on a CLUSTERING_COLUMN column definition. |
| * |
| * A cell indexed by this index will have the general form: |
| * ck_0 ... ck_n c_name : v |
| * where ck_i are the cluster keys, c_name the last component of the cell |
| * composite name (or second to last if collections are in use, but this |
| * has no impact) and v the cell value. |
| * |
| * Such a cell is always indexed by this index (or rather, it is indexed if |
| * n >= columnDef.componentIndex, which will always be the case in practice) |
| * and it will generate (makeIndexColumnName()) an index entry whose: |
| * - row key will be ck_i (getIndexedValue()) where i == columnDef.componentIndex. |
| * - cell name will |
| * rk ck_0 ... ck_{i-1} ck_{i+1} ck_n |
| * where rk is the row key of the initial cell and i == columnDef.componentIndex. |
| */ |
| public class CompositesIndexOnClusteringKey extends CompositesIndex |
| { |
| public static CellNameType buildIndexComparator(CFMetaData baseMetadata, ColumnDefinition columnDef) |
| { |
| // Index cell names are rk ck_0 ... ck_{i-1} ck_{i+1} ck_n, so n |
| // components total (where n is the number of clustering keys) |
| int ckCount = baseMetadata.clusteringColumns().size(); |
| List<AbstractType<?>> types = new ArrayList<AbstractType<?>>(ckCount); |
| types.add(SecondaryIndex.keyComparator); |
| for (int i = 0; i < columnDef.position(); i++) |
| types.add(baseMetadata.clusteringColumns().get(i).type); |
| for (int i = columnDef.position() + 1; i < ckCount; i++) |
| types.add(baseMetadata.clusteringColumns().get(i).type); |
| return new CompoundDenseCellNameType(types); |
| } |
| |
| protected ByteBuffer getIndexedValue(ByteBuffer rowKey, Cell cell) |
| { |
| return cell.name().get(columnDef.position()); |
| } |
| |
| protected Composite makeIndexColumnPrefix(ByteBuffer rowKey, Composite columnName) |
| { |
| int count = Math.min(baseCfs.metadata.clusteringColumns().size(), columnName.size()); |
| CBuilder builder = getIndexComparator().prefixBuilder(); |
| builder.add(rowKey); |
| for (int i = 0; i < Math.min(columnDef.position(), count); i++) |
| builder.add(columnName.get(i)); |
| for (int i = columnDef.position() + 1; i < count; i++) |
| builder.add(columnName.get(i)); |
| return builder.build(); |
| } |
| |
| public IndexedEntry decodeEntry(DecoratedKey indexedValue, Cell indexEntry) |
| { |
| int ckCount = baseCfs.metadata.clusteringColumns().size(); |
| |
| CBuilder builder = baseCfs.getComparator().builder(); |
| for (int i = 0; i < columnDef.position(); i++) |
| builder.add(indexEntry.name().get(i + 1)); |
| |
| builder.add(indexedValue.getKey()); |
| |
| for (int i = columnDef.position() + 1; i < ckCount; i++) |
| builder.add(indexEntry.name().get(i)); |
| |
| return new IndexedEntry(indexedValue, indexEntry.name(), indexEntry.timestamp(), indexEntry.name().get(0), builder.build()); |
| } |
| |
| @Override |
| public boolean indexes(CellName name) |
| { |
| // For now, assume this is only used in CQL3 when we know name has enough component. |
| return true; |
| } |
| |
| public boolean isStale(IndexedEntry entry, ColumnFamily data, long now) |
| { |
| return data.hasOnlyTombstones(now); |
| } |
| |
| @Override |
| public void delete(ByteBuffer rowKey, Cell cell, OpOrder.Group opGroup) |
| { |
| // We only know that one column of the CQL row has been updated/deleted, but we don't know if the |
| // full row has been deleted so we should not do anything. If it ends up that the whole row has |
| // been deleted, it will be eventually cleaned up on read because the entry will be detected stale. |
| } |
| } |