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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.operator.aggregation;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
    private final boolean approximationSupported;
    private final AccumulatorStateSerializer<?> stateSerializer;
    private final AccumulatorStateFactory<?> stateFactory;
    private final Constructor<? extends AccumulatoraccumulatorConstructor;
    private final Constructor<? extends GroupedAccumulatorgroupedAccumulatorConstructor;
            AccumulatorStateSerializer<?> stateSerializer,
            AccumulatorStateFactory<?> stateFactory,
            Class<? extends AccumulatoraccumulatorClass,
            Class<? extends GroupedAccumulatorgroupedAccumulatorClass,
            boolean approximationSupported)
    {
        this. = checkNotNull(stateSerializer"stateSerializer is null");
        this. = checkNotNull(stateFactory"stateFactory is null");
        this. = approximationSupported;
        try {
             = accumulatorClass.getConstructor(
                    AccumulatorStateSerializer.class,
                    AccumulatorStateFactory.class,
                    List.class,
                    Optional.class,
                    Optional.class,
                    double.class);
             = groupedAccumulatorClass.getConstructor(
                    AccumulatorStateSerializer.class,
                    AccumulatorStateFactory.class,
                    List.class,
                    Optional.class,
                    Optional.class,
                    double.class);
        }
        catch (NoSuchMethodException e) {
            throw Throwables.propagate(e);
        }
    }
    public AccumulatorFactory bind(List<IntegerargumentChannelsOptional<IntegermaskChannelOptional<IntegersampleWeightChanneldouble confidence)
    {
        if (!) {
            checkArgument(confidence == 1.0, "Approximate queries not supported");
            checkArgument(!sampleWeightChannel.isPresent(), "Sampled data not supported");
        }
        return new GenericAccumulatorFactory(argumentChannelsmaskChannelsampleWeightChannelconfidence);
    }
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