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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
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// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// ============================================================================
package functionalj.stream.longstream.collect;

import java.util.function.ObjLongConsumer;

import functionalj.stream.collect.Collected;


public interface LongCollectedToDouble extends Collected, LongCollected {
    
    public static  LongCollectedToDouble of(LongCollectorToDoublePlus collector) {
        return new LongCollectedToDouble.Impl(collector);
    }
    
    //== Instance ==
    
    public void   accumulate(long each);
    public double finishAsDouble();
    
    public default Double finish() {
        return finishAsDouble();
    }
    
    public default void accumulate(Long each) {
        accumulate(each);
    }
    
    //== Implementation ==
    
    public static class Impl implements LongCollectedToDouble {
        
        private final LongCollectorToDoublePlus collector;
        private final ObjLongConsumer           accumulator;
        private final ACCUMULATED                            accumulated;
        
        public Impl(LongCollectorToDoublePlus collector) {
            this.collector   = collector;
            this.accumulated = collector.supplier().get();
            this.accumulator = collector.longAccumulator();
        }
        
        public void accumulate(long each) {
            accumulator.accept(accumulated, each);
        }
        
        @Override
        public double finishAsDouble() {
            return collector.finisher().apply(accumulated);
        }
        
    }
    
}