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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.doublestream;

import java.util.concurrent.atomic.AtomicInteger;
import java.util.function.DoubleFunction;
import java.util.function.DoubleUnaryOperator;

import functionalj.function.DoubleObjBiFunction;
import functionalj.function.IntDoubleBiFunction;
import functionalj.function.IntDoubleToDoubleFunctionPrimitive;
import functionalj.function.IntDoubleToIntFunction;
import functionalj.stream.StreamPlus;
import functionalj.stream.intstream.IntStreamPlus;
import functionalj.tuple.IntDoubleTuple;
import lombok.val;



public interface DoubleStreamPlusWithMapWithIndex {
    
    // // TODO - to int, long, double
    
    public DoubleStreamPlus doubleStreamPlus();
    
    /** @return  the stream of each value and index. */
    public default StreamPlus mapWithIndex() {
        val index = new AtomicInteger();
        val streamPlus = doubleStreamPlus();
        return streamPlus
                .mapToObj(each -> {
                    val currentIndex = index.getAndIncrement();
                    val tuple        = IntDoubleTuple.of(currentIndex, each);
                    return tuple;
                });
    }
    
    /** Create a stream whose value is the combination between value of this stream and its index. */
    public default DoubleStreamPlus mapWithIndex(IntDoubleToDoubleFunctionPrimitive combinator) {
        val index = new AtomicInteger();
        val streamPlus = doubleStreamPlus();
        return streamPlus
                .map(each -> {
                    val currentIndex = index.getAndIncrement();
                    val target       = combinator.applyIntDouble(currentIndex, each);
                    return target;
                });
    }
    
    /** Create a stream whose value is the combination between value of this stream and its index. */
    public default IntStreamPlus mapToIntWithIndex(IntDoubleToIntFunction combinator) {
        val index = new AtomicInteger();
        val streamPlus = doubleStreamPlus();
        return streamPlus
                .mapToInt(each -> {
                    val currentIndex = index.getAndIncrement();
                    val target       = combinator.applyIntAndDouble(currentIndex, each);
                    return target;
                });
    }
    
    /** Create a stream whose value is the combination between value of this stream and its index. */
    public default  StreamPlus mapToObjWithIndex(IntDoubleBiFunction combinator) {
        val index = new AtomicInteger();
        val streamPlus = doubleStreamPlus();
        return streamPlus
                .mapToObj(each -> {
                    val currentIndex = index.getAndIncrement();
                    val target       = combinator.applyIntAndDouble(currentIndex, each);
                    return target;
                });
    }
    
    /** Create a stream whose value is the combination between value of this stream and its index. */
    public default  StreamPlus mapWithIndex(
                DoubleUnaryOperator    valueMapper,
                IntDoubleBiFunction combiner) {
        val index = new AtomicInteger();
        val streamPlus = doubleStreamPlus();
        return streamPlus
                .mapToObj(each -> {
                    val currentIndex = index.getAndIncrement();
                    val value        = valueMapper.applyAsDouble(each);
                    val target       = combiner.applyIntAndDouble(currentIndex, value);
                    return target;
                });
    }
    
    /** Create a stream whose value is the combination between the mapped value of this stream and its index. */
    public default  StreamPlus mapToObjWithIndex(
                DoubleFunction       valueMapper,
                DoubleObjBiFunction combiner) {
        val index = new AtomicInteger();
        val streamPlus = doubleStreamPlus();
        return streamPlus
                .mapToObj(each -> {
                    val i      = index.getAndIncrement();
                    val value  = valueMapper.apply(each);
                    val target = combiner.applyAsDouble(i, value);
                    return target;
                });
    }
    
}