HelidonVersionChecker.java

/*
 * Copyright (c) 2025 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.helidon.connector;

import org.glassfish.jersey.internal.util.collection.LazyValue;
import org.glassfish.jersey.internal.util.collection.Value;
import org.glassfish.jersey.internal.util.collection.Values;

import java.lang.reflect.Field;

/* package */ class HelidonVersionChecker {
    static enum Version {
        VERSION_3,
        VERSION_4;
    }

    /* package */ static final LazyValue<Version> VERSION = Values.lazy((Value<Version>) () -> {
       try {
           // Cannot use io.helidon.common.Version.VERSION as that constant is linked into the code, resulting in 4.2.4 constant
           // Must do it in the Runtime
           Field field = Class.forName("io.helidon.common.Version").getDeclaredField("VERSION");
           String version = (String) field.get(null);
           return version.startsWith("4") ? Version.VERSION_4 : Version.VERSION_3;
       } catch (Throwable t) {
           // not helidon 4
       }
       return Version.VERSION_3;
    });
}