/*
* Licensed 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 com.facebook.presto.index;
import com.facebook.presto.metadata.ColumnHandle;
import com.facebook.presto.metadata.IndexHandle;
import com.facebook.presto.metadata.ResolvedIndex;
import com.facebook.presto.metadata.TableHandle;
import com.facebook.presto.spi.ConnectorColumnHandle;
import com.facebook.presto.spi.ConnectorIndexResolver;
import com.facebook.presto.spi.ConnectorResolvedIndex;
import com.facebook.presto.spi.Index;
import com.facebook.presto.spi.TupleDomain;
import com.google.common.base.Optional;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;
import java.util.List;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import static com.facebook.presto.metadata.ColumnHandle.connectorHandleGetter;
import static com.facebook.presto.metadata.Util.toConnectorDomain;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkState;
public class IndexManager
{
private final ConcurrentMap<String, ConnectorIndexResolver> resolvers = new ConcurrentHashMap<>();
public void addIndexResolver(String connectorId, ConnectorIndexResolver resolver)
{
checkState(resolvers.putIfAbsent(connectorId, resolver) == null, "IndexResolver for connector '%s' is already registered", connectorId);
}
public Optional<ResolvedIndex> resolveIndex(TableHandle tableHandle, Set<ColumnHandle> indexableColumns, TupleDomain<ColumnHandle> tupleDomain)
{
ConnectorIndexResolver resolver = resolvers.get(tableHandle.getConnectorId());
if (resolver == null) {
return Optional.absent();
}
Set<ConnectorColumnHandle> columns = ImmutableSet.copyOf(Iterables.transform(indexableColumns, ColumnHandle.connectorHandleGetter()));
ConnectorResolvedIndex resolved = resolver.resolveIndex(tableHandle.getConnectorHandle(), columns, toConnectorDomain(tupleDomain));
if (resolved == null) {
return Optional.absent();
}
return Optional.of(new ResolvedIndex(tableHandle.getConnectorId(), resolved));
}
public Index getIndex(IndexHandle indexHandle, List<ColumnHandle> lookupSchema, List<ColumnHandle> outputSchema)
{
return getResolver(indexHandle)
.getIndex(indexHandle.getConnectorHandle(), Lists.transform(lookupSchema, connectorHandleGetter()), Lists.transform(outputSchema, connectorHandleGetter()));
}
private ConnectorIndexResolver getResolver(IndexHandle handle)
{
ConnectorIndexResolver result = resolvers.get(handle.getConnectorId());
checkArgument(result != null, "No index resolver for connector '%s'", handle.getConnectorId());
return result;
}
}