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 /*
  * 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 static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkState;
public class IndexManager
    private final ConcurrentMap<StringConnectorIndexResolverresolvers = new ConcurrentHashMap<>();
    public void addIndexResolver(String connectorIdConnectorIndexResolver resolver)
    {
        checkState(.putIfAbsent(connectorIdresolver) == null"IndexResolver for connector '%s' is already registered"connectorId);
    }
    public Optional<ResolvedIndexresolveIndex(TableHandle tableHandleSet<ColumnHandleindexableColumnsTupleDomain<ColumnHandletupleDomain)
    {
        ConnectorIndexResolver resolver = .get(tableHandle.getConnectorId());
        if (resolver == null) {
            return Optional.empty();
        }
        ConnectorResolvedIndex resolved = resolver.resolveIndex(tableHandle.getConnectorHandle(), indexableColumnstupleDomain);
        if (resolved == null) {
            return Optional.empty();
        }
        return Optional.of(new ResolvedIndex(tableHandle.getConnectorId(), resolved));
    }
    public ConnectorIndex getIndex(IndexHandle indexHandleList<ColumnHandlelookupSchemaList<ColumnHandleoutputSchema)
    {
        return getResolver(indexHandle)
                .getIndex(indexHandle.getConnectorHandle(), lookupSchemaoutputSchema);
    }
    {
        ConnectorIndexResolver result = .get(handle.getConnectorId());
        checkArgument(result != null"No index resolver for connector '%s'"handle.getConnectorId());
        return result;
    }
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