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package jdk.internal.vm.compiler.collections;

Unmodifiable memory efficient set data structure.
Since:1.0
/** * Unmodifiable memory efficient set data structure. * * @since 1.0 */
public interface UnmodifiableEconomicSet<E> extends Iterable<E> {
Returns true if this set contains a mapping for the element.
Since:1.0
/** * Returns {@code true} if this set contains a mapping for the {@code element}. * * @since 1.0 */
boolean contains(E element);
Returns the number of elements in this set.
Since:1.0
/** * Returns the number of elements in this set. * * @since 1.0 */
int size();
Returns true if this set contains no elements.
Since:1.0
/** * Returns {@code true} if this set contains no elements. * * @since 1.0 */
boolean isEmpty();
Stores all of the elements in this set into target. An UnsupportedOperationException will be thrown if the length of target does not match the size of this set.
Throws:
Returns:an array containing all the elements in this set.
Since:1.0
/** * Stores all of the elements in this set into {@code target}. An * {@link UnsupportedOperationException} will be thrown if the length of {@code target} does not * match the size of this set. * * @return an array containing all the elements in this set. * @throws UnsupportedOperationException if the length of {@code target} does not equal the size * of this set. * @since 1.0 */
default E[] toArray(E[] target) { if (target.length != size()) { throw new UnsupportedOperationException("Length of target array must equal the size of the set."); } int index = 0; for (E element : this) { target[index++] = element; } return target; } }