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GraalVM is an ecosystem for compiling and running applications written in multiple languages. GraalVM removes the isolation between programming languages and enables interoperability in a shared runtime.

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/*
 * Copyright (c) 2017, 2018, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * The Universal Permissive License (UPL), Version 1.0
 *
 * Subject to the condition set forth below, permission is hereby granted to any
 * person obtaining a copy of this software, associated documentation and/or
 * data (collectively the "Software"), free of charge and under any and all
 * copyright rights in the Software, and any and all patent rights owned or
 * freely licensable by each licensor hereunder covering either (i) the
 * unmodified Software as contributed to or provided by such licensor, or (ii)
 * the Larger Works (as defined below), to deal in both
 *
 * (a) the Software, and
 *
 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
 * one is included with the Software each a "Larger Work" to which the Software
 * is contributed by such licensors),
 *
 * without restriction, including without limitation the rights to copy, create
 * derivative works of, display, perform, and distribute the Software and make,
 * use, sell, offer for sale, import, export, have made, and have sold the
 * Software and the Larger Work(s), and to sublicense the foregoing rights on
 * either these or other terms.
 *
 * This license is subject to the following condition:
 *
 * The above copyright notice and either this complete permission notice or at a
 * minimum a reference to the UPL must be included in all copies or substantial
 * portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package org.graalvm.collections;

/**
 * Unmodifiable memory efficient set data structure.
 *
 * @since 1.0
 */
public interface UnmodifiableEconomicSet extends Iterable {

    /**
     * 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
     */
    int size();

    /**
     * Returns {@code true} if this set contains no elements.
     *
     * @since 1.0
     */
    boolean isEmpty();

    /**
     * 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;
    }
}