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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
*
* 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;
import java.util.Collections;
import java.util.Set;
import java.util.function.Predicate;
import org.apache.cassandra.db.DecoratedKey;
import org.apache.cassandra.db.RegularAndStaticColumns;
import org.apache.cassandra.db.WriteContext;
import org.apache.cassandra.db.filter.RowFilter;
import org.apache.cassandra.db.lifecycle.LifecycleNewTracker;
import org.apache.cassandra.db.memtable.Memtable;
import org.apache.cassandra.index.transactions.IndexTransaction;
import org.apache.cassandra.io.sstable.Component;
import org.apache.cassandra.io.sstable.Descriptor;
import org.apache.cassandra.io.sstable.SSTableFlushObserver;
import org.apache.cassandra.schema.TableMetadata;
/**
* An {@link Index.Group} containing a single {@link Index}, to which it just delegates the calls.
*/
public class SingletonIndexGroup implements Index.Group
{
private final Index delegate;
private final Set indexes;
protected SingletonIndexGroup(Index delegate)
{
this.delegate = delegate;
this.indexes = Collections.singleton(delegate);
}
@Override
public Set getIndexes()
{
return indexes;
}
public Index getIndex()
{
return delegate;
}
@Override
public void addIndex(Index index)
{
throw new UnsupportedOperationException();
}
@Override
public void removeIndex(Index index)
{
throw new UnsupportedOperationException();
}
@Override
public boolean containsIndex(Index index)
{
return index.equals(delegate);
}
@Override
public Index.Indexer indexerFor(Predicate indexSelector,
DecoratedKey key,
RegularAndStaticColumns columns,
long nowInSec,
WriteContext ctx,
IndexTransaction.Type transactionType,
Memtable memtable)
{
return indexSelector.test(delegate)
? delegate.indexerFor(key, columns, nowInSec, ctx, transactionType, memtable)
: null;
}
@Override
public Index.QueryPlan queryPlanFor(RowFilter rowFilter)
{
return SingletonIndexQueryPlan.create(delegate, rowFilter);
}
@Override
public SSTableFlushObserver getFlushObserver(Descriptor descriptor, LifecycleNewTracker tracker, TableMetadata tableMetadata)
{
return delegate.getFlushObserver(descriptor, tracker);
}
@Override
public Set getComponents()
{
return delegate.getComponents();
}
}
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