GroupedMultimapAggregationState.java

/*
 * 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.operator.aggregation.multimapagg;

import com.facebook.presto.common.PageBuilder;
import com.facebook.presto.common.block.Block;
import com.facebook.presto.common.type.Type;
import com.facebook.presto.operator.aggregation.AbstractGroupCollectionAggregationState;
import com.google.common.collect.ImmutableList;

public final class GroupedMultimapAggregationState
        extends AbstractGroupCollectionAggregationState<MultimapAggregationStateConsumer>
        implements MultimapAggregationState
{
    private static final int MAX_BLOCK_SIZE = 1024 * 1024;
    static final int VALUE_CHANNEL = 0;
    static final int KEY_CHANNEL = 1;

    public GroupedMultimapAggregationState(Type keyType, Type valueType)
    {
        super(PageBuilder.withMaxPageSize(MAX_BLOCK_SIZE, ImmutableList.of(valueType, keyType)));
    }

    @Override
    public final void add(Block keyBlock, Block valueBlock, int position)
    {
        prepareAdd();
        appendAtChannel(VALUE_CHANNEL, valueBlock, position);
        appendAtChannel(KEY_CHANNEL, keyBlock, position);
    }

    @Override
    protected final void accept(MultimapAggregationStateConsumer consumer, PageBuilder pageBuilder, int currentPosition)
    {
        consumer.accept(pageBuilder.getBlockBuilder(KEY_CHANNEL), pageBuilder.getBlockBuilder(VALUE_CHANNEL), currentPosition);
    }
}