| /* |
| * 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.marshal.CompositeType; |
| 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 PARTITION_KEY column definition. |
| * |
| * This suppose a composite row key: |
| * rk = rk_0 ... rk_n |
| * |
| * The corresponding index entry will be: |
| * - index row key will be rk_i (where i == columnDef.componentIndex) |
| * - cell name will be: rk ck |
| * where rk is the fully partition key and ck the clustering keys of the |
| * original cell names (thus excluding the last column name as we want to refer to |
| * the whole CQL3 row, not just the cell itself) |
| * |
| * Note that contrarily to other type of index, we repeat the indexed value in |
| * the index cell name (we use the whole partition key). The reason is that we |
| * want to order the index cell name by partitioner first, and skipping a part |
| * of the row key would change the order. |
| */ |
| public class PartitionKeyIndex extends CassandraIndex |
| { |
| private final boolean enforceStrictLiveness; |
| public PartitionKeyIndex(ColumnFamilyStore baseCfs, IndexMetadata indexDef) |
| { |
| super(baseCfs, indexDef); |
| this.enforceStrictLiveness = baseCfs.metadata.get().enforceStrictLiveness(); |
| } |
| |
| public ByteBuffer getIndexedValue(ByteBuffer partitionKey, |
| Clustering<?> clustering, |
| CellPath path, |
| ByteBuffer cellValue) |
| { |
| CompositeType keyComparator = (CompositeType)baseCfs.metadata().partitionKeyType; |
| ByteBuffer[] components = keyComparator.split(partitionKey); |
| return components[indexedColumn.position()]; |
| } |
| |
| public <T> CBuilder buildIndexClusteringPrefix(ByteBuffer partitionKey, |
| ClusteringPrefix<T> prefix, |
| CellPath path) |
| { |
| CBuilder builder = CBuilder.create(getIndexComparator()); |
| builder.add(partitionKey); |
| for (int i = 0; i < prefix.size(); i++) |
| builder.add(prefix.get(i), prefix.accessor()); |
| 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 < ckCount; i++) |
| builder.add(clustering, i + 1); |
| |
| return new IndexEntry(indexedValue, |
| clustering, |
| indexEntry.primaryKeyLivenessInfo().timestamp(), |
| clustering.bufferAt(0), |
| builder.build()); |
| } |
| |
| public boolean isStale(Row data, ByteBuffer indexValue, int nowInSec) |
| { |
| return !data.hasLiveData(nowInSec, enforceStrictLiveness); |
| } |
| } |