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The module for FunctionalJ Core.
There is a newer version: 1.0.17
// ============================================================================
// 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.stream.collect;

import java.util.Set;
import java.util.function.BiConsumer;
import java.util.function.BinaryOperator;
import java.util.function.DoubleFunction;
import java.util.function.Function;
import java.util.function.IntFunction;
import java.util.function.LongFunction;
import java.util.function.Supplier;
import java.util.function.ToDoubleFunction;

import functionalj.stream.doublestream.collect.DoubleCollectorToDoublePlus;
import functionalj.stream.intstream.collect.IntCollectorToDoublePlus;
import functionalj.stream.longstream.collect.LongCollectorToDoublePlus;
import lombok.val;

public interface CollectorToDoublePlus 
                    extends CollectorPlus {
    
    public Supplier         supplier();
    public BiConsumer accumulator();
    public BinaryOperator   combiner();
    public ToDoubleFunction finisherToDouble();
    public Set          characteristics();
    
    public default Function finisher() {
        val finisherToDouble = finisherToDouble();
        return accumulated -> {
            return finisherToDouble.applyAsDouble(accumulated);
        };
    }
    
    //== Derived ==
    
    public default  CollectorToDoublePlus of(Function mapper) {
        return new DerivedCollectorToDoublePlus.FromObj<>(this, mapper);
    }
    
    public default IntCollectorToDoublePlus of(IntFunction mapper) {
        return new DerivedCollectorToDoublePlus.FromInt<>(this, mapper);
    }
    
    public default LongCollectorToDoublePlus of(LongFunction mapper) {
        return new DerivedCollectorToDoublePlus.FromLong<>(this, mapper);
    }
    
    public default DoubleCollectorToDoublePlus of(DoubleFunction mapper) {
        return new DerivedCollectorToDoublePlus.FromDouble<>(this, mapper);
    }
}