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///###////////////////////////////////////////////////////////////////////////
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// Burton Computer Corporation
// http://www.burton-computer.com
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// Copyright (c) 2014, Burton Computer Corporation
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package org.javimmutable.collections.hash;

import org.javimmutable.collections.Cursor;
import org.javimmutable.collections.Holder;
import org.javimmutable.collections.Holders;
import org.javimmutable.collections.JImmutableMap;
import org.javimmutable.collections.array.trie32.Transforms;
import org.javimmutable.collections.common.MutableDelta;
import org.javimmutable.collections.tree.ComparableComparator;
import org.javimmutable.collections.tree.TreeNode;

import javax.annotation.concurrent.Immutable;
import java.util.Comparator;

/**
 * Transforms implementation that stores values in TreeNodes (2-3 trees).
 * Usable with keys that implement Comparable.  Will fail with any other
 * type of key.
 *
 * @param 
 * @param 
 */
@Immutable
class HashValueTreeTransforms, V>
        implements Transforms, K, V>
{
    private final Comparator comparator = ComparableComparator.of();

    @Override
    public TreeNode update(Holder> leaf,
                                 K key,
                                 V value,
                                 MutableDelta delta)
    {
        if (leaf.isEmpty()) {
            return TreeNode.of().assign(comparator, key, value, delta);
        } else {
            return leaf.getValue().assign(comparator, key, value, delta);
        }
    }

    @Override
    public Holder> delete(TreeNode leaf,
                                         K key,
                                         MutableDelta delta)
    {
        final TreeNode newTree = leaf.delete(comparator, key, delta);
        return (newTree.isEmpty()) ? Holders.>of() : Holders.of(newTree);
    }

    @Override
    public Holder findValue(TreeNode leaf,
                               K key)
    {
        return leaf.find(comparator, key);
    }

    @Override
    public Holder> findEntry(TreeNode leaf,
                                                       K key)
    {
        return leaf.findEntry(comparator, key);
    }

    @Override
    public Cursor> cursor(TreeNode leaf)
    {
        return leaf.cursor();
    }
}




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