| /* |
| * 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; |
| |
| /** |
| * Common superclass for indexes that capture collection keys, including |
| * indexes on such keys themselves. |
| * |
| * A cell indexed by this index will have the general form: |
| * ck_0 ... ck_n c_name [col_elt] : v |
| * where ck_i are the cluster keys, c_name the CQL3 column name, col_elt the |
| * collection element that we want to index (which may or may not be there depending |
| * on whether c_name is the collection we're indexing), and v the cell value. |
| * |
| * Such a cell is indexed if c_name is the indexed collection (in which case we are guaranteed to have |
| * col_elt). The index entry can be viewed in the following way: |
| * - the row key is determined by subclasses of this type. |
| * - the cell name will be 'rk ck_0 ... ck_n' where rk is the row key of the initial cell. |
| */ |
| public abstract class CollectionKeyIndexBase extends CassandraIndex |
| { |
| public CollectionKeyIndexBase(ColumnFamilyStore baseCfs, IndexMetadata indexDef) |
| { |
| super(baseCfs, indexDef); |
| } |
| |
| 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)); |
| |
| return builder; |
| } |
| |
| public IndexEntry decodeEntry(DecoratedKey indexedValue, |
| Row indexEntry) |
| { |
| int count = 1 + baseCfs.metadata.clusteringColumns().size(); |
| Clustering clustering = indexEntry.clustering(); |
| CBuilder builder = CBuilder.create(baseCfs.getComparator()); |
| for (int i = 0; i < count - 1; i++) |
| builder.add(clustering.get(i + 1)); |
| |
| return new IndexEntry(indexedValue, |
| clustering, |
| indexEntry.primaryKeyLivenessInfo().timestamp(), |
| clustering.get(0), |
| builder.build()); |
| } |
| } |