| /* |
| * 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.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 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 |
| * {@code |
| * 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 ClusteringColumnIndex extends CassandraIndex |
| { |
| public ClusteringColumnIndex(ColumnFamilyStore baseCfs, IndexMetadata indexDef) |
| { |
| super(baseCfs, indexDef); |
| } |
| |
| |
| public ByteBuffer getIndexedValue(ByteBuffer partitionKey, |
| Clustering clustering, |
| CellPath path, ByteBuffer cellValue) |
| { |
| return clustering.get(indexedColumn.position()); |
| } |
| |
| public CBuilder buildIndexClusteringPrefix(ByteBuffer partitionKey, |
| ClusteringPrefix prefix, |
| CellPath path) |
| { |
| CBuilder builder = CBuilder.create(getIndexComparator()); |
| builder.add(partitionKey); |
| for (int i = 0; i < Math.min(indexedColumn.position(), prefix.size()); i++) |
| builder.add(prefix.get(i)); |
| for (int i = indexedColumn.position() + 1; i < prefix.size(); i++) |
| builder.add(prefix.get(i)); |
| return builder; |
| } |
| |
| public IndexEntry decodeEntry(DecoratedKey indexedValue, |
| Row indexEntry) |
| { |
| int ckCount = baseCfs.metadata.clusteringColumns().size(); |
| |
| Clustering clustering = indexEntry.clustering(); |
| CBuilder builder = CBuilder.create(baseCfs.getComparator()); |
| for (int i = 0; i < indexedColumn.position(); i++) |
| builder.add(clustering.get(i + 1)); |
| |
| builder.add(indexedValue.getKey()); |
| |
| for (int i = indexedColumn.position() + 1; i < ckCount; i++) |
| builder.add(clustering.get(i)); |
| |
| return new IndexEntry(indexedValue, |
| clustering, |
| indexEntry.primaryKeyLivenessInfo().timestamp(), |
| clustering.get(0), |
| builder.build()); |
| } |
| |
| public boolean isStale(Row data, ByteBuffer indexValue, int nowInSec) |
| { |
| return !data.hasLiveData(nowInSec); |
| } |
| } |