| /* |
| * 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.index.internal.composites; |
| |
| import java.nio.ByteBuffer; |
| |
| import org.apache.cassandra.db.*; |
| import org.apache.cassandra.db.rows.Cell; |
| import org.apache.cassandra.db.rows.CellPath; |
| import org.apache.cassandra.db.rows.Row; |
| import org.apache.cassandra.index.internal.CassandraIndex; |
| import org.apache.cassandra.index.internal.IndexEntry; |
| import org.apache.cassandra.schema.IndexMetadata; |
| |
| /** |
| * Index on a REGULAR column definition on a composite type. |
| * |
| * 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 indexed if c_name == columnDef.name, and it will generate |
| * (makeIndexColumnName()) an index entry whose: |
| * - row key will be the value v (getIndexedValue()). |
| * - cell name will |
| * rk ck_0 ... ck_n |
| * where rk is the row key of the initial cell. I.e. the index entry store |
| * all the information require to locate back the indexed cell. |
| */ |
| public class RegularColumnIndex extends CassandraIndex |
| { |
| public RegularColumnIndex(ColumnFamilyStore baseCfs, IndexMetadata indexDef) |
| { |
| super(baseCfs, indexDef); |
| } |
| |
| public ByteBuffer getIndexedValue(ByteBuffer partitionKey, |
| Clustering clustering, |
| CellPath path, |
| ByteBuffer cellValue) |
| { |
| return cellValue; |
| } |
| |
| public CBuilder buildIndexClusteringPrefix(ByteBuffer partitionKey, |
| ClusteringPrefix prefix, |
| CellPath path) |
| { |
| CBuilder builder = CBuilder.create(getIndexComparator()); |
| builder.add(partitionKey); |
| for (int i = 0; i < prefix.size(); i++) |
| builder.add(prefix.get(i)); |
| |
| // Note: if indexing a static column, prefix will be Clustering.STATIC_CLUSTERING |
| // so the Clustering obtained from builder::build will contain a value for only |
| // the partition key. At query time though, this is all that's needed as the entire |
| // base table partition should be returned for any mathching index entry. |
| return builder; |
| } |
| |
| public IndexEntry decodeEntry(DecoratedKey indexedValue, Row indexEntry) |
| { |
| Clustering clustering = indexEntry.clustering(); |
| |
| Clustering indexedEntryClustering = null; |
| if (getIndexedColumn().isStatic()) |
| indexedEntryClustering = Clustering.STATIC_CLUSTERING; |
| else |
| { |
| ClusteringComparator baseComparator = baseCfs.getComparator(); |
| CBuilder builder = CBuilder.create(baseComparator); |
| for (int i = 0; i < baseComparator.size(); i++) |
| builder.add(clustering.get(i + 1)); |
| indexedEntryClustering = builder.build(); |
| } |
| |
| return new IndexEntry(indexedValue, |
| clustering, |
| indexEntry.primaryKeyLivenessInfo().timestamp(), |
| clustering.get(0), |
| indexedEntryClustering); |
| } |
| |
| public boolean isStale(Row data, ByteBuffer indexValue, int nowInSec) |
| { |
| Cell cell = data.getCell(indexedColumn); |
| return cell == null |
| || !cell.isLive(nowInSec) |
| || indexedColumn.type.compare(indexValue, cell.value()) != 0; |
| } |
| } |