/**
* Creates a Tree of the given elements.
*
* @param <T> Component type of the List.
* @param values Zero or more values.
* @return A Tree containing the given values.
* @throws NullPointerException if {@code values} is null
*/
@SuppressWarnings("varargs")
@SafeVarargs
static <T> Tree<T> of(T... values) {
Objects.requireNonNull(values, "values is null");
List<T> list = List.of(values);
return list.isEmpty() ? Empty.instance() : new Node<>(list.head(), list.tail().map(Tree::of));
}
/**
* Creates a Tree of the given elements.
*
* <p>If the given iterable is a tree, it is returned as result. if the iteration order of the
* elements is stable.
*
* @param <T> Component type of the List.
* @param iterable An Iterable of elements.
* @return A list containing the given elements in the same order.
* @throws NullPointerException if {@code elements} is null
*/
@SuppressWarnings("unchecked")
static <T> Tree<T> ofAll(Iterable<? extends T> iterable) {
Objects.requireNonNull(iterable, "iterable is null");
if (iterable instanceof Tree) {
return (Tree<T>) iterable;
} else {
final List<T> list = List.ofAll(iterable);
return list.isEmpty() ? Empty.instance() : new Node<>(list.head(), list.tail().map(Tree::of));
}
}
@SuppressWarnings("unchecked")
@Override
default <C> Map<C, Seq<T>> groupBy(Function<? super T, ? extends C> classifier) {
Objects.requireNonNull(classifier, "classifier is null");
if (isEmpty()) {
return HashMap.empty();
} else {
return (Map<C, Seq<T>>) traverse().groupBy(classifier);
}
}
@Override
default <U> Tree<Tuple2<T, U>> zipAll(Iterable<U> that, T thisElem, U thatElem) {
Objects.requireNonNull(that, "that is null");
if (isEmpty()) {
return Iterator.ofAll(that).map(elem -> Tuple.of(thisElem, elem)).toTree();
} else {
final java.util.Iterator<U> thatIter = that.iterator();
final Tree<Tuple2<T, U>> tree = ZipAll.apply((Node<T>) this, thatIter, thatElem);
if (thatIter.hasNext()) {
final Iterable<Node<Tuple2<T, U>>> remainder =
Iterator.ofAll(thatIter).map(elem -> Tree.of(Tuple.of(thisElem, elem)));
return new Node<>(tree.getValue(), tree.getChildren().appendAll(remainder));
} else {
return tree;
}
}
}
/**
* Returns a new Node containing the given value and having the given children.
*
* @param value A value
* @param children The child nodes, possibly empty
* @param <T> Value type
* @return A new Node instance.
*/
static <T> Node<T> of(T value, Iterable<Node<T>> children) {
Objects.requireNonNull(children, "children is null");
return new Node<>(value, List.ofAll(children));
}
/**
* Constructs a rose tree branch.
*
* @param value A value.
* @param children A non-empty list of children.
* @throws NullPointerException if children is null
* @throws IllegalArgumentException if children is empty
*/
public Node(T value, List<Node<T>> children) {
Objects.requireNonNull(children, "children is null");
this.value = value;
this.children = children;
this.size = Lazy.of(() -> 1 + children.foldLeft(0, (acc, child) -> acc + child.length()));
this.hashCode = 31 * 31 + 31 * Objects.hashCode(value) + Objects.hashCode(children);
}
@Override
public boolean equals(Object o) {
if (o == this) {
return true;
} else if (o instanceof Node) {
final Node<?> that = (Node<?>) o;
return Objects.equals(this.getValue(), that.getValue())
&& Objects.equals(this.getChildren(), that.getChildren());
} else {
return false;
}
}
protected FilterJoinNode(
Class joinClass,
String[] joinColumns,
String column,
FilterExpress express,
Serializable value) {
Objects.requireNonNull(joinClass);
Objects.requireNonNull(joinColumns);
this.joinClass = joinClass;
this.joinColumns = joinColumns;
this.column = column;
this.express = express;
this.value = value;
}
/**
* {@inheritDoc}
*
* <p>This method will, on a best-effort basis, throw a {@link
* java.util.ConcurrentModificationException} if the remapping function modified this map during
* computation.
*
* @throws ConcurrentModificationException if it is detected that the remapping function modified
* this map
*/
@Override
public synchronized V computeIfPresent(
K key, BiFunction<? super K, ? super V, ? extends V> remappingFunction) {
Objects.requireNonNull(remappingFunction);
Entry<?, ?> tab[] = table;
int hash = key.hashCode();
int index = (hash & 0x7FFFFFFF) % tab.length;
@SuppressWarnings("unchecked")
Entry<K, V> e = (Entry<K, V>) tab[index];
for (Entry<K, V> prev = null; e != null; prev = e, e = e.next) {
if (e.hash == hash && e.key.equals(key)) {
int mc = modCount;
V newValue = remappingFunction.apply(key, e.value);
if (mc != modCount) {
throw new ConcurrentModificationException();
}
if (newValue == null) {
if (prev != null) {
prev.next = e.next;
} else {
tab[index] = e.next;
}
modCount = mc + 1;
count--;
} else {
e.value = newValue;
}
return newValue;
}
}
return null;
}
/**
* {@inheritDoc}
*
* <p>This method will, on a best-effort basis, throw a {@link
* java.util.ConcurrentModificationException} if the mapping function modified this map during
* computation.
*
* @throws ConcurrentModificationException if it is detected that the mapping function modified
* this map
*/
@Override
public synchronized V computeIfAbsent(K key, Function<? super K, ? extends V> mappingFunction) {
Objects.requireNonNull(mappingFunction);
Entry<?, ?> tab[] = table;
int hash = key.hashCode();
int index = (hash & 0x7FFFFFFF) % tab.length;
@SuppressWarnings("unchecked")
Entry<K, V> e = (Entry<K, V>) tab[index];
for (; e != null; e = e.next) {
if (e.hash == hash && e.key.equals(key)) {
// Hashtable not accept null value
return e.value;
}
}
int mc = modCount;
V newValue = mappingFunction.apply(key);
if (mc != modCount) {
throw new ConcurrentModificationException();
}
if (newValue != null) {
addEntry(hash, key, newValue, index);
}
return newValue;
}
@Override
default Tree<T> peek(Consumer<? super T> action) {
Objects.requireNonNull(action, "action is null");
if (!isEmpty()) {
action.accept(head());
}
return this;
}
public static <T, E> T getKeyByValue(Map<T, E> map, E value) {
for (Map.Entry<T, E> entry : map.entrySet()) {
if (Objects.equals(value, entry.getValue())) {
return entry.getKey();
}
}
return null;
}
@Override
default Seq<T> distinctBy(Comparator<? super T> comparator) {
Objects.requireNonNull(comparator, "comparator is null");
if (isEmpty()) {
return Stream.empty();
} else {
return traverse().distinctBy(comparator);
}
}
@Override
default <U> U foldRight(U zero, BiFunction<? super T, ? super U, ? extends U> f) {
Objects.requireNonNull(f, "f is null");
if (isEmpty()) {
return zero;
} else {
return iterator().foldRight(zero, f);
}
}
@Override
default <U> Tree<Tuple2<T, U>> zip(Iterable<U> that) {
Objects.requireNonNull(that, "that is null");
if (isEmpty()) {
return Empty.instance();
} else {
return Zip.apply((Node<T>) this, that.iterator());
}
}
@Override
default Seq<T> filter(Predicate<? super T> predicate) {
Objects.requireNonNull(predicate, "predicate is null");
if (isEmpty()) {
return Stream.empty();
} else {
return traverse().filter(predicate);
}
}
@Override
default <U> Seq<T> distinctBy(Function<? super T, ? extends U> keyExtractor) {
Objects.requireNonNull(keyExtractor, "keyExtractor is null");
if (isEmpty()) {
return Stream.empty();
} else {
return traverse().distinctBy(keyExtractor);
}
}
@SuppressWarnings("unchecked")
@Override
public synchronized void replaceAll(BiFunction<? super K, ? super V, ? extends V> function) {
Objects.requireNonNull(function); // explicit check required in case
// table is empty.
final int expectedModCount = modCount;
Entry<K, V>[] tab = (Entry<K, V>[]) table;
for (Entry<K, V> entry : tab) {
while (entry != null) {
entry.value = Objects.requireNonNull(function.apply(entry.key, entry.value));
entry = entry.next;
if (expectedModCount != modCount) {
throw new ConcurrentModificationException();
}
}
}
}
@SuppressWarnings("unchecked")
@Override
default Tuple2<Seq<T>, Seq<T>> span(Predicate<? super T> predicate) {
Objects.requireNonNull(predicate, "predicate is null");
if (isEmpty()) {
return Tuple.of(Stream.empty(), Stream.empty());
} else {
return (Tuple2<Seq<T>, Seq<T>>) traverse().span(predicate);
}
}
@SuppressWarnings("unchecked")
@Override
default <T1, T2, T3> Tuple3<Tree<T1>, Tree<T2>, Tree<T3>> unzip3(
Function<? super T, Tuple3<? extends T1, ? extends T2, ? extends T3>> unzipper) {
Objects.requireNonNull(unzipper, "unzipper is null");
if (isEmpty()) {
return Tuple.of(Empty.instance(), Empty.instance(), Empty.instance());
} else {
return (Tuple3<Tree<T1>, Tree<T2>, Tree<T3>>) (Object) Unzip.apply3((Node<T>) this, unzipper);
}
}
@Override
public synchronized boolean replace(K key, V oldValue, V newValue) {
Objects.requireNonNull(oldValue);
Objects.requireNonNull(newValue);
Entry<?, ?> tab[] = table;
int hash = key.hashCode();
int index = (hash & 0x7FFFFFFF) % tab.length;
@SuppressWarnings("unchecked")
Entry<K, V> e = (Entry<K, V>) tab[index];
for (; e != null; e = e.next) {
if ((e.hash == hash) && e.key.equals(key)) {
if (e.value.equals(oldValue)) {
e.value = newValue;
return true;
} else {
return false;
}
}
}
return false;
}
// Idea:
// Traverse (depth-first) until a match is found, then stop and rebuild relevant parts of the
// tree.
// If not found, return the same tree instance.
static <T> Node<T> apply(Node<T> node, T currentElement, T newElement) {
if (Objects.equals(node.getValue(), currentElement)) {
return new Node<>(newElement, node.getChildren());
} else {
for (Node<T> child : node.getChildren()) {
final Node<T> newChild = Replace.apply(child, currentElement, newElement);
final boolean found = newChild != child;
if (found) {
final List<Node<T>> newChildren = node.getChildren().replace(child, newChild);
return new Node<>(node.getValue(), newChildren);
}
}
return node;
}
}
@Override
public synchronized V replace(K key, V value) {
Objects.requireNonNull(value);
Entry<?, ?> tab[] = table;
int hash = key.hashCode();
int index = (hash & 0x7FFFFFFF) % tab.length;
@SuppressWarnings("unchecked")
Entry<K, V> e = (Entry<K, V>) tab[index];
for (; e != null; e = e.next) {
if ((e.hash == hash) && e.key.equals(key)) {
V oldValue = e.value;
e.value = value;
return oldValue;
}
}
return null;
}
@SuppressWarnings("unchecked")
@Override
public synchronized void forEach(BiConsumer<? super K, ? super V> action) {
Objects.requireNonNull(action); // explicit check required in case
// table is empty.
final int expectedModCount = modCount;
Entry<?, ?>[] tab = table;
for (Entry<?, ?> entry : tab) {
while (entry != null) {
action.accept((K) entry.key, (V) entry.value);
entry = entry.next;
if (expectedModCount != modCount) {
throw new ConcurrentModificationException();
}
}
}
}
/**
* Traverses the Tree in a specific order.
*
* @param order the tree traversal order
* @return A List containing all elements of this tree, which is List if this tree is empty.
* @throws java.lang.NullPointerException if order is null
*/
default Seq<T> traverse(Order order) {
Objects.requireNonNull(order, "order is null");
if (isEmpty()) {
return Stream.empty();
} else {
switch (order) {
case PRE_ORDER:
return Traversal.preOrder(this);
case IN_ORDER:
return Traversal.inOrder(this);
case POST_ORDER:
return Traversal.postOrder(this);
case LEVEL_ORDER:
return Traversal.levelOrder(this);
default:
throw new IllegalStateException("Unknown order: " + order.name());
}
}
}
@Override
public synchronized V putIfAbsent(K key, V value) {
Objects.requireNonNull(value);
// Makes sure the key is not already in the hashtable.
Entry<?, ?> tab[] = table;
int hash = key.hashCode();
int index = (hash & 0x7FFFFFFF) % tab.length;
@SuppressWarnings("unchecked")
Entry<K, V> entry = (Entry<K, V>) tab[index];
for (; entry != null; entry = entry.next) {
if ((entry.hash == hash) && entry.key.equals(key)) {
V old = entry.value;
if (old == null) {
entry.value = value;
}
return old;
}
}
addEntry(hash, key, value, index);
return null;
}
@Override
public synchronized boolean remove(Object key, Object value) {
Objects.requireNonNull(value);
Entry<?, ?> tab[] = table;
int hash = key.hashCode();
int index = (hash & 0x7FFFFFFF) % tab.length;
@SuppressWarnings("unchecked")
Entry<K, V> e = (Entry<K, V>) tab[index];
for (Entry<K, V> prev = null; e != null; prev = e, e = e.next) {
if ((e.hash == hash) && e.key.equals(key) && e.value.equals(value)) {
if (prev != null) {
prev.next = e.next;
} else {
tab[index] = e.next;
}
e.value = null; // clear for gc
modCount++;
count--;
return true;
}
}
return false;
}
@Override
protected FilterNode any(final FilterNode node0, boolean signor) {
Objects.requireNonNull(node0);
if (!(node0 instanceof FilterJoinNode)) {
throw new IllegalArgumentException(
this
+ (signor ? " or " : " and ")
+ " a node but "
+ String.valueOf(node0)
+ "is not a "
+ FilterJoinNode.class.getSimpleName());
}
final FilterJoinNode node = (FilterJoinNode) node0;
if (this.nodes == null) {
this.nodes = new FilterNode[] {node};
this.or = signor;
return this;
}
if (or == signor || this.column == null) {
FilterNode[] newsiblings = new FilterNode[nodes.length + 1];
System.arraycopy(nodes, 0, newsiblings, 0, nodes.length);
newsiblings[nodes.length] = node;
this.nodes = newsiblings;
if (this.column == null) this.or = signor;
return this;
}
this.nodes = new FilterNode[] {new FilterJoinNode(node), node};
this.column = null;
this.express = null;
this.value = null;
this.joinClass = null;
this.joinEntity = null;
this.joinColumns = null;
this.or = signor;
return this;
}
/**
* Returns a new Node containing the given value and having the given children.
*
* @param value A value
* @param children The child nodes, possibly empty
* @param <T> Value type
* @return A new Node instance.
*/
@SuppressWarnings("varargs")
@SafeVarargs
static <T> Node<T> of(T value, Node<T>... children) {
Objects.requireNonNull(children, "children is null");
return new Node<>(value, List.of(children));
}
@Override
default Seq<T> takeWhile(Predicate<? super T> predicate) {
Objects.requireNonNull(predicate, "predicate is null");
return traverse().takeWhile(predicate);
}