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A bundle project producing JAX-RS RI bundles. The primary artifact is an "all-in-one" OSGi-fied JAX-RS RI bundle (jaxrs-ri.jar). Attached to that are two compressed JAX-RS RI archives. The first archive (jaxrs-ri.zip) consists of binary RI bits and contains the API jar (under "api" directory), RI libraries (under "lib" directory) as well as all external RI dependencies (under "ext" directory). The secondary archive (jaxrs-ri-src.zip) contains buildable JAX-RS RI source bundle and contains the API jar (under "api" directory), RI sources (under "src" directory) as well as all external RI dependencies (under "ext" directory). The second archive also contains "build.xml" ANT script that builds the RI sources. To build the JAX-RS RI simply unzip the archive, cd to the created jaxrs-ri directory and invoke "ant" from the command line.

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/*
 * Copyright (c) 2017, 2018 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package org.glassfish.jersey.internal.util.collection;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
import java.util.stream.Collector;

/**
 * Set of convenient function regarding a collection immutability. Particularly useful in the conjunction with
 * {@link java.util.stream.Stream}.
 */
public class ImmutableCollectors {

    /**
     * Creates a {@link Collector} of an immutable list for {@link java.util.stream.Stream#collect(Collector)}.
     *
     * @param  type of the immutable list.
     * @return collector for immutable list.
     */
    public static  Collector, List> toImmutableList() {
        return Collector.of(ArrayList::new, List::add, (left, right) -> {
            left.addAll(right);
            return left;
        }, Collections::unmodifiableList);
    }

    /**
     * Creates a {@link Collector} of an immutable Set for {@link java.util.stream.Stream#collect(Collector)}.
     *
     * @param  type of the immutable set.
     * @return collector for immutable set.
     */
    public static  Collector, Set> toImmutableSet() {
        return Collector.of(HashSet::new, Set::add, (left, right) -> {
            left.addAll(right);
            return left;
        }, Collections::unmodifiableSet);
    }

    /**
     * Creates a {@link Collector} of an immutable Set for {@link java.util.stream.Stream#collect(Collector)}.
     *
     * @param  type of the immutable linked hash set.
     * @return collector for immutable linked hash set.
     */
    public static  Collector, Set> toImmutableLinkedSet() {
        return Collector.of(LinkedHashSet::new, Set::add, (left, right) -> {
            left.addAll(right);
            return left;
        }, Collections::unmodifiableSet);
    }
}