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The module for FunctionalJ Core.
There is a newer version: 1.0.17
// ============================================================================
// Copyright (c) 2017-2019 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.lens.lenses;

import java.util.function.BiFunction;
import java.util.function.Function;
import java.util.function.Supplier;

import functionalj.lens.core.AccessParameterized2;
import functionalj.lens.core.LensSpec;
import functionalj.lens.core.LensSpecParameterized2;
import functionalj.lens.core.LensType;
import functionalj.lens.core.LensUtils;
import functionalj.lens.core.WriteLens;
import functionalj.tuple.ImmutableTuple2;
import functionalj.tuple.Tuple2;
import lombok.val;

@SuppressWarnings("javadoc")
@FunctionalInterface
public interface Tuple2Lens, T2LENS extends AnyLens>
        extends
            ObjectLens>,
            Tuple2Access {

    public static , _2ACCESS extends AnyAccess, 
                   _1LENS extends AnyLens, _2LENS extends AnyLens>
            Tuple2Lens of(
                    Function>      read,
                    WriteLens>      write,
                    LensType _1Type,
                    LensType _2Type) {
        val spec = new LensSpecParameterized2, _1, _2, _1LENS, _2LENS>() {
            @Override public LensSpec> getSpec()          { return LensSpec.of(read, write); }
            @Override public _1LENS createSubLens1(LensSpec subSpec) { return _1Type.newLens(subSpec); }
            @Override public _2LENS createSubLens2(LensSpec subSpec) { return _2Type.newLens(subSpec); }
        };
        return ()->spec;
    }
    
    public LensSpecParameterized2, T1, T2, T1LENS, T2LENS> lensSpecParameterized2();
    
    @Override
    public default AccessParameterized2, T1, T2, T1LENS, T2LENS> accessParameterized2() {
        return lensSpecParameterized2();
    }
    
    @Override
    public default LensSpec> lensSpec() {
        return lensSpecParameterized2().getSpec();
    }
    
    @Override
    default Tuple2 applyUnsafe(HOST host) throws Exception {
        return Tuple2Access.super.applyUnsafe(host);
    }
    
    public default T1LENS _1() {
        WriteLens, T1> write = (tuple, _1) -> new ImmutableTuple2(_1, tuple._2());
        Function, T1>  read  = Tuple2::_1;
        return LensUtils.createSubLens(this, read, write, lensSpecParameterized2()::createSubLens1);
    }
    
    public default T2LENS _2() {
        WriteLens, T2> write = (tuple, _2) -> new ImmutableTuple2(tuple._1(), _2);
        Function, T2>  read  = Tuple2::_2;
        return LensUtils.createSubLens(this, read, write, lensSpecParameterized2()::createSubLens2);
    }
    
    public default T1LENS first() {
        return _1();
    }
    
    public default T2LENS second() {
        return _2();
    }
    
    public default Function change1To(T1 _1value) {
        return host -> {
            Tuple2 newTuple = new ImmutableTuple2<>(_1value, apply(host)._2());
            return apply(host, newTuple);
        };
    }
    
    public default Function change2To(T2 _2value) {
        return host -> {
            Tuple2 newTuple = new ImmutableTuple2<>(apply(host)._1(), _2value);
            return apply(host, newTuple);
        };
    }
    
    public default Function change1By(Supplier _1valueSupplier) {
        return host -> {
            val newTuple = new ImmutableTuple2<>(_1valueSupplier.get(), apply(host)._2());
            return apply(host, newTuple);
        };
    }
    
    public default Function change2By(Supplier _2valueSupplier) {
        return host -> {
            val newTuple = new ImmutableTuple2<>(apply(host)._1(), _2valueSupplier.get());
            return apply(host, newTuple);
        };
    }
    
    public default Function change1By(Function _1valueTransformer) {
        return host -> {
            val oldTuple = apply(host);
            val new_1    = _1valueTransformer.apply(oldTuple._1());
            val newTuple = new ImmutableTuple2<>(new_1, oldTuple._2());
            return apply(host, newTuple);
        };
    }
    
    public default Function change2By(Function _2valueTransformer) {
        return host -> {
            val oldTuple = apply(host);
            val new_2    = _2valueTransformer.apply(oldTuple._2());
            val newTuple = new ImmutableTuple2<>(oldTuple._1(), new_2);
            return apply(host, newTuple);
        };
    }
    
    public default Function change1By(BiFunction _1valueTransformer) {
        return host -> {
            val oldTuple = apply(host);
            val new_1    = _1valueTransformer.apply(oldTuple._1(), oldTuple._2());
            val newTuple = new ImmutableTuple2<>(new_1, oldTuple._2());
            return apply(host, newTuple);
        };
    }
    
    public default Function change2By(BiFunction _2valueTransformer) {
        return host -> {
            val oldTuple = apply(host);
            val new_2    = _2valueTransformer.apply(oldTuple._1(), oldTuple._2());
            val newTuple = new ImmutableTuple2<>(oldTuple._1(), new_2);
            return apply(host, newTuple);
        };
    }
    
    public default Function changeFirstTo(T1 _1value) {
        return change1To(_1value);
    }
    
    public default Function changeSecondTo(T2 _2value) {
        return change2To(_2value);
    }
    
    public default Function changeFirstBy(Supplier _1valueSupplier) {
        return change1By(_1valueSupplier);
    }
    
    public default Function changeSecondBy(Supplier _2valueSupplier) {
        return change2By(_2valueSupplier);
    }
    
    public default Function changeFirstBy(Function _1valueTransformer) {
        return change1By(_1valueTransformer);
    }
    
    public default Function changeSecondBy(Function _2valueTransformer) {
        return change2By(_2valueTransformer);
    }
    
    public default Function changeFirstBy(BiFunction _1valueTransformer) {
        return change1By(_1valueTransformer);
    }
    
    public default Function changeSecondBy(BiFunction _2valueTransformer) {
        return change2By(_2valueTransformer);
    }
}