org.javimmutable.collections.hash.HashValueTreeTransforms Maven / Gradle / Ivy
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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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