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EE4J Compatible Implementation for Jakarta Faces API

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/*
 * Copyright (c) 1997, 2020 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 com.sun.faces.application.applicationimpl.events;

import com.sun.faces.util.Cache;
import com.sun.faces.util.Cache.Factory;

import jakarta.faces.event.SystemEvent;

/**
 * Utility class for dealing with {@link jakarta.faces.component.UIComponent} events.
 */
public class ComponentSystemEventHelper {

    private Cache, Cache, EventInfo>> sourceCache;

    // -------------------------------------------------------- Constructors

    public ComponentSystemEventHelper() {

        // Initialize the 'sources' cache for, ahem, readability...
        // ~generics++
        Factory, Cache, EventInfo>> eventCacheFactory = sourceClass -> {
            Factory, EventInfo> eventInfoFactory = systemEventClass -> new EventInfo(systemEventClass, sourceClass);
            return new Cache<>(eventInfoFactory);
        };
        sourceCache = new Cache<>(eventCacheFactory);

    }

    // ------------------------------------------------------ Public Methods

    public EventInfo getEventInfo(Class systemEvent, Class sourceClass) {

        Cache, EventInfo> eventsCache = sourceCache.get(sourceClass);
        return eventsCache.get(systemEvent);

    }

}