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// ============================================================================
// Copyright (c) 2017-2021 Nawapunth Manusitthipol (NawaMan - http://nawaman.net).
// ----------------------------------------------------------------------------
// MIT License
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
// ============================================================================
package functionalj.function.aggregator;
import java.util.function.DoubleFunction;
import java.util.function.Function;
import java.util.function.IntFunction;
import java.util.function.LongFunction;
import functionalj.stream.collect.CollectorPlus;
import functionalj.stream.collect.CollectorToDoublePlus;
import functionalj.stream.collect.CollectorToIntPlus;
import functionalj.stream.collect.CollectorToLongPlus;
import lombok.val;
public abstract class Aggregation {
public static Aggregation from(CollectorPlus collector) {
return new Aggregation.Impl(collector);
}
public static AggregationToInt from(CollectorToIntPlus collector) {
return forInt(collector);
}
public static AggregationToLong from(CollectorToLongPlus collector) {
return forLong(collector);
}
public static AggregationToDouble from(CollectorToDoublePlus collector) {
return forDouble(collector);
}
public static AggregationToInt forInt(CollectorToIntPlus collector) {
return AggregationToInt.from(collector);
}
public static AggregationToLong forLong(CollectorToLongPlus collector) {
return AggregationToLong.from(collector);
}
public static AggregationToDouble forDouble(CollectorToDoublePlus collector) {
return AggregationToDouble.from(collector);
}
//== Instance ==
public abstract CollectorPlus collectorPlus();
public Aggregator newAggregator() {
val collector = collectorPlus();
return new Aggregator.Impl<>(collector);
}
//== Derived ==
public Aggregation of(Function mapper) {
val newCollector = collectorPlus().of(mapper);
return new Aggregation.Impl<>(newCollector);
}
public IntAggregation ofInt(IntFunction mapper) {
val newCollector = collectorPlus().of(mapper);
return new IntAggregation.Impl<>(newCollector);
}
public LongAggregation ofLong(LongFunction mapper) {
val newCollector = collectorPlus().of(mapper);
return new LongAggregation.Impl<>(newCollector);
}
public DoubleAggregation ofDouble(DoubleFunction mapper) {
val newCollector = collectorPlus().of(mapper);
return new DoubleAggregation.Impl<>(newCollector);
}
//== Implementation ==
public static class Impl extends Aggregation {
private final CollectorPlus collector;
public Impl(CollectorPlus collector) {
this.collector = collector;
}
@Override
public CollectorPlus collectorPlus() {
return collector;
}
}
}
