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• InstanceSupplierFactoryBridge.java

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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2017 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://oss.oracle.com/licenses/CDDL+GPL-1.1
 * or LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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package org.glassfish.jersey.inject.hk2;

import java.util.function.Supplier;

import org.glassfish.jersey.internal.inject.DisposableSupplier;

import org.glassfish.hk2.api.Factory;
import org.glassfish.hk2.api.ServiceLocator;

/**
 * This class is used as a bridge between {@link Factory HK2 Factory} and JDK {@link Supplier}. Using this class {@link Supplier}
 * is able to behave as a factory in service locator. The bridge just delegates all invocations to provided {@link ServiceLocator}
 * and therefore all operation should be in proper scope and context.
 * 

 * This bridge is dedicated to instance binding therefore underlying {@code supplier} is always only single instance.
 *
 * @param  type which could be handled by {@code Supplier} and this bridge.
 */
public class InstanceSupplierFactoryBridge implements Factory {

    private Supplier supplier;
    private boolean disposable;

    /**
     * Constructor for a new bridge.
     *
     * @param supplier   type which will be looked for in locator.
     * @param disposable flag whether the bridge is set up for disposing the created object.
     */
    InstanceSupplierFactoryBridge(Supplier supplier, boolean disposable) {
        this.supplier = supplier;
        this.disposable = disposable;
    }

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

    @Override
    public void dispose(T instance) {
        if (disposable) {
            ((DisposableSupplier) supplier).dispose(instance);
        }
    }
}