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package org.javimmutable.collections;

/**
 * Collection of useful temporary object classes.  These can be useful as simple temporary arguments
 * to lambda expressions like reduce().  These classes have public fields and are not intended to
 * be used for any sort of long lived objects and certainly not as part of a data model.  However
 * they can serve as a useful way to pass a few temporary values to a reduce method or provide
 * a simple set of working variables that a lambda can update (working around the effectively
 * final restriction).
 */
public class Temp
{
    public static  Val1 val(A a)
    {
        return new Val1<>(a);
    }

    public static  Val2 val(A a,
                                        B b)
    {
        return new Val2<>(a, b);
    }

    public static  Val3 val(A a,
                                              B b,
                                              C c)
    {
        return new Val3<>(a, b, c);
    }

    public static  Val4 val(A a,
                                                    B b,
                                                    C c,
                                                    D d)
    {
        return new Val4<>(a, b, c, d);
    }

    public static class Val1
    {
        public final A a;

        public Val1(A a)
        {
            this.a = a;
        }
    }

    public static class Val2
    {
        public final A a;
        public final B b;

        public Val2(A a,
                    B b)
        {
            this.a = a;
            this.b = b;
        }
    }

    public static class Val3
    {
        public final A a;
        public final B b;
        public final C c;

        public Val3(A a,
                    B b,
                    C c)
        {
            this.a = a;
            this.b = b;
            this.c = c;
        }
    }

    public static class Val4
    {
        public final A a;
        public final B b;
        public final C c;
        public final D d;

        public Val4(A a,
                    B b,
                    C c,
                    D d)
        {
            this.a = a;
            this.b = b;
            this.c = c;
            this.d = d;
        }
    }

    public static  Var1 var(X x)
    {
        return new Var1<>(x);
    }

    public static  Var2 var(X x,
                                        Y y)
    {
        return new Var2<>(x, y);
    }

    public static  Var3 var(X x,
                                              Y y,
                                              Z z)
    {
        return new Var3<>(x, y, z);
    }

    public static  Var4 var(W w,
                                                    X x,
                                                    Y y,
                                                    Z z)
    {
        return new Var4<>(w, x, y, z);
    }

    public static class Var1
    {
        public X x;

        public Var1(X x)
        {
            this.x = x;
        }
    }

    public static class Var2
    {
        public X x;
        public Y y;

        public Var2(X x,
                    Y y)
        {
            this.x = x;
            this.y = y;
        }
    }

    public static class Var3
    {
        public X x;
        public Y y;
        public Z z;

        public Var3(X x,
                    Y y,
                    Z z)
        {
            this.x = x;
            this.y = y;
            this.z = z;
        }
    }

    public static class Var4
    {
        public W w;
        public X x;
        public Y y;
        public Z z;

        public Var4(W w,
                    X x,
                    Y y,
                    Z z)
        {
            this.w = w;
            this.x = x;
            this.y = y;
            this.z = z;
        }
    }

    public static class Int1
    {
        public int a;

        public Int1(int a)
        {
            this.a = a;
        }
    }

    public static Int1 intVar(int a)
    {
        return new Int1(a);
    }
}