/*
 * 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.ignite.internal.processors.query.calcite.metadata;

import com.google.common.collect.ImmutableList;
import org.apache.calcite.rel.RelNode;
import org.apache.calcite.rel.metadata.ChainedRelMetadataProvider;
import org.apache.calcite.rel.metadata.DefaultRelMetadataProvider;
import org.apache.calcite.rel.metadata.Metadata;
import org.apache.calcite.rel.metadata.MetadataDef;
import org.apache.calcite.rel.metadata.MetadataHandler;
import org.apache.calcite.rel.metadata.RelMetadataProvider;
import org.apache.calcite.rel.metadata.RelMetadataQuery;
import org.apache.ignite.internal.processors.query.calcite.prepare.MappingQueryContext;
import org.apache.ignite.internal.processors.query.calcite.util.IgniteMethod;

/**
 * Utility class, holding metadata related interfaces and metadata providers.
 */
public class IgniteMetadata {
    /** Metadata provider. */
    public static final RelMetadataProvider METADATA_PROVIDER =
        ChainedRelMetadataProvider.of(
            ImmutableList.of(
                // Ignite specific providers
                IgniteMdFragmentMapping.SOURCE,

                // Ignite overriden providers
                IgniteMdDistribution.SOURCE,
                IgniteMdPercentageOriginalRows.SOURCE,
                IgniteMdCumulativeCost.SOURCE,
                IgniteMdNonCumulativeCost.SOURCE,
                IgniteMdRowCount.SOURCE,
                IgniteMdPredicates.SOURCE,
                IgniteMdCollation.SOURCE,
                IgniteMdSelectivity.SOURCE,
                IgniteMdColumnOrigins.SOURCE,
                IgniteMdDistinctRowCount.SOURCE,

                // Basic providers
                DefaultRelMetadataProvider.INSTANCE));

    /** */
    public interface FragmentMappingMetadata extends Metadata {
        /** */
        MetadataDef<FragmentMappingMetadata> DEF = MetadataDef.of(FragmentMappingMetadata.class,
            FragmentMappingMetadata.Handler.class, IgniteMethod.FRAGMENT_MAPPING.method());

        /** Determines how the rows are distributed. */
        FragmentMapping fragmentMapping(MappingQueryContext ctx);

        /** Handler API. */
        interface Handler extends MetadataHandler<FragmentMappingMetadata> {
            /** */
            FragmentMapping fragmentMapping(RelNode r, RelMetadataQuery mq, MappingQueryContext ctx);
        }
    }
}
