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package bjc.utils.funcdata.bst;
import java.util.Comparator;
import java.util.function.BiFunction;
import java.util.function.Function;
import java.util.function.Predicate;
/**
* A leaf in a tree.
*
* @author ben
*
* @param <T>
* The data stored in the tree.
*/
public class BinarySearchTreeLeaf<T> implements ITreePart<T> {
/**
* The data held in this tree leaf
*/
protected T data;
/**
* Whether this node is soft-deleted or not
*/
protected boolean isDeleted;
/**
* Create a new leaf holding the specified data.
*
* @param element
* The data for the leaf to hold.
*/
public BinarySearchTreeLeaf(T element) {
data = element;
}
@Override
public void add(T element, Comparator<T> comparator) {
throw new IllegalArgumentException("Can't add to a leaf.");
}
@Override
public <E> E collapse(Function<T, E> leafTransformer, BiFunction<E, E, E> branchCollapser) {
if(leafTransformer == null) throw new NullPointerException("Transformer must not be null");
return leafTransformer.apply(data);
}
@Override
public boolean contains(T element, Comparator<T> comparator) {
return this.data.equals(element);
}
@Override
public T data() {
return data;
}
@Override
public void delete(T element, Comparator<T> comparator) {
if(data.equals(element)) {
isDeleted = true;
}
}
@Override
public boolean directedWalk(DirectedWalkFunction<T> treeWalker) {
if(treeWalker == null) throw new NullPointerException("Tree walker must not be null");
switch(treeWalker.walk(data)) {
case SUCCESS:
return true;
// We don't have any children to care about
case FAILURE:
case LEFT:
case RIGHT:
default:
return false;
}
}
@Override
public boolean forEach(TreeLinearizationMethod linearizationMethod, Predicate<T> traversalPredicate) {
if(traversalPredicate == null) throw new NullPointerException("Predicate must not be null");
return traversalPredicate.test(data);
}
}
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