/* * 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.keys; import java.nio.ByteBuffer; import java.util.Set; import org.apache.cassandra.db.ColumnFamily; import org.apache.cassandra.db.Column; import org.apache.cassandra.db.index.AbstractSimplePerColumnSecondaryIndex; import org.apache.cassandra.db.index.SecondaryIndexSearcher; import org.apache.cassandra.db.marshal.AbstractType; import org.apache.cassandra.exceptions.ConfigurationException; /** * Implements a secondary index for a column family using a second column family * in which the row keys are indexed values, and column names are base row keys. */ public class KeysIndex extends AbstractSimplePerColumnSecondaryIndex { protected ByteBuffer getIndexedValue(ByteBuffer rowKey, Column column) { return column.value(); } protected ByteBuffer makeIndexColumnName(ByteBuffer rowKey, Column column) { return rowKey; } public SecondaryIndexSearcher createSecondaryIndexSearcher(Set<ByteBuffer> columns) { return new KeysSearcher(baseCfs.indexManager, columns); } public boolean isIndexEntryStale(ByteBuffer indexedValue, ColumnFamily data, long now) { Column liveColumn = data.getColumn(columnDef.name); if (liveColumn == null || liveColumn.isMarkedForDelete(now)) return true; ByteBuffer liveValue = liveColumn.value(); return columnDef.getValidator().compare(indexedValue, liveValue) != 0; } public void validateOptions() throws ConfigurationException { // no options used } protected AbstractType getExpressionComparator() { return baseCfs.getComparator(); } }