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/*
 * (c) Copyright 2018 Palantir Technologies Inc. All rights reserved.
 *
 * 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.palantir.atlasdb.keyvalue.dbkvs.impl.batch;

import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;
import com.palantir.common.collect.Maps2;
import java.util.List;
import java.util.Map;

public final class BatchingStrategies {

    private BatchingStrategies() {}

    @SuppressWarnings("unchecked")
    public static  BatchingTaskRunner.BatchingStrategy> forIterable() {
        return (IterableBatchingStrategy) iterableBatchingStrategy;
    }

    @SuppressWarnings("unchecked")
    public static  BatchingTaskRunner.BatchingStrategy> forList() {
        return (ListBatchingStrategy) listBatchingStrategy;
    }

    @SuppressWarnings("unchecked")
    public static  BatchingTaskRunner.BatchingStrategy> forMap() {
        return (MapBatchingStrategy) mapBatchingStrategy;
    }

    private static final class IterableBatchingStrategy implements BatchingTaskRunner.BatchingStrategy> {
        @Override
        public Iterable> partitionIntoBatches(Iterable collection, int batchSizeHint) {
            return Iterables.partition(collection, batchSizeHint);
        }
    }

    private static final IterableBatchingStrategy iterableBatchingStrategy = new IterableBatchingStrategy<>();

    private static final class ListBatchingStrategy implements BatchingTaskRunner.BatchingStrategy> {
        @Override
        public Iterable> partitionIntoBatches(List collection, int batchSizeHint) {
            return Lists.partition(collection, batchSizeHint);
        }
    }

    private static final ListBatchingStrategy listBatchingStrategy = new ListBatchingStrategy<>();

    private static final class MapBatchingStrategy implements BatchingTaskRunner.BatchingStrategy> {
        @Override
        public Iterable> partitionIntoBatches(Map collection, int batchSizeHint) {
            return Iterables.transform(Iterables.partition(collection.entrySet(), batchSizeHint), Maps2::fromEntries);
        }
    }

    private static final MapBatchingStrategy mapBatchingStrategy = new MapBatchingStrategy<>();
}