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package Torello.Java.ReadOnly;

import java.util.Map;
import java.util.Set;
import java.util.Iterator;

class ROHelperEntrySet 
{

    // Copied directly from java.util.AbstractMap (on GitHub)
    //
    // NOTE: I didn't exactly get it, but when I switched from the <?, ?> to the <A, B> Type
    //       variables it seemed to correct a certain error.
    //       I don't like it when I cannot figure out what just happened with Generics, but this
    //       time, I really COULD NOT figure out why javac like <A, B> better than <?, ?>

    static <A, B> String toString(Map<A, B> m, Set<Map.Entry<A, B>> entrySet)
    {
        Iterator<Map.Entry<A, B>> i = entrySet /* () */.iterator();

        if (! i.hasNext()) return "{}";

        StringBuilder sb = new StringBuilder();
        sb.append('{');

        for (;;)
        {
            Map.Entry<A, B> e = i.next();

            A key   = e.getKey();
            B value = e.getValue();

            sb.append(key   == /* this */ m ? "(this Map)" : key);
            sb.append('=');
            sb.append(value == /* this */ m ? "(this Map)" : value);

            if (! i.hasNext()) return sb.append('}').toString();

            sb.append(',').append(' ');
        }
    }


    // *** Java-HTML: This thing arbitrarily uses a HashSet
    // Currently this is used **ONCE** inside InterfaceBuilder
    // It is also used in each of the 4 ReadOnlyMap's: TreeMap, HashMap, Hashtable, Properties
    // There it is used to help override the original "entrySet()" method.

    static <A, B> ReadOnlySet<ReadOnlyMap.Entry<A, B>> toReadOnlyEntrySet(Set<Map.Entry<A, B>> set)
    {
        return new ReadOnlyHashSet<ReadOnlyMap.Entry<A, B>>
            (set, e -> new EntryImpl<>(e), set.size(), null);

        // The new series of constructors makes the above line a little nicer, I guess?
        // Below is what was done, previously

        /*
        ROHashSetBuilder<ReadOnlyMap.Entry<A, B>> b = new ROHashSetBuilder<>();
        for (Map.Entry<A, B> e : set) b.add(new EntryImpl<>(e));
        return b.build();
        */
    }

}