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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) 2011, 2019 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.inject;

import java.util.function.Supplier;

import javax.inject.Provider;

import org.glassfish.jersey.internal.util.collection.Ref;
import org.glassfish.jersey.internal.util.collection.Refs;

/**
 * Factory that provides injection of the referenced instance.
 *
 * @param 
 * @author Marek Potociar
 */
public abstract class ReferencingFactory implements Supplier {

    private static class EmptyReferenceFactory implements Supplier> {

        @Override
        public Ref get() {
            return Refs.emptyRef();
        }
    }

    private static class InitializedReferenceFactory implements Supplier> {

        private final T initialValue;

        public InitializedReferenceFactory(T initialValue) {
            this.initialValue = initialValue;
        }

        @Override
        public Ref get() {
            return Refs.of(initialValue);
        }
    }

    private final Provider> referenceFactory;

    /**
     * Create new referencing injection factory.
     *
     * @param referenceFactory reference provider backing the factory.
     */
    public ReferencingFactory(Provider> referenceFactory) {
        this.referenceFactory = referenceFactory;
    }

    @Override
    public T get() {
        return referenceFactory.get().get();
    }

    /**
     * Get a reference factory providing an empty reference.
     *
     * @param  reference type.
     * @return reference factory providing an empty reference.
     */
    public static  Supplier> referenceFactory() {
        return new EmptyReferenceFactory<>();
    }

    /**
     * Get a reference factory providing an initialized reference.
     *
     * @param           reference type.
     * @param initialValue initial value stored in the reference provided
     *                     by the returned factory.
     * @return reference factory providing a reference initialized with an
     *         {@code initialValue}.
     */
    public static  Supplier> referenceFactory(T initialValue) {
        if (initialValue == null) {
            return new EmptyReferenceFactory<>();
        }

        return new InitializedReferenceFactory<>(initialValue);
    }
}