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AspectJ tools most notably contains the AspectJ compiler (AJC). AJC applies aspects to Java classes during compilation, fully replacing Javac for plain Java classes and also compiling native AspectJ or annotation-based @AspectJ syntax. Furthermore, AJC can weave aspects into existing class files in a post-compile binary weaving step. This library is a superset of AspectJ weaver and hence also of AspectJ runtime.

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/*******************************************************************************
 * Copyright (c) 2006, 2018 IBM Corp. and others
 *
 * This program and the accompanying materials are made available under
 * the terms of the Eclipse Public License 2.0 which accompanies this
 * distribution and is available at https://www.eclipse.org/legal/epl-2.0/
 * or the Apache License, Version 2.0 which accompanies this distribution and
 * is available at https://www.apache.org/licenses/LICENSE-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 [1] and GNU General Public License, version 2 with the
 * OpenJDK Assembly Exception [2].
 *
 * [1] https://www.gnu.org/software/classpath/license.html
 * [2] http://openjdk.java.net/legal/assembly-exception.html
 *
 * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception
 *******************************************************************************/

package org.eclipse.osgi.internal.cds;

import org.eclipse.osgi.framework.log.FrameworkLogEntry;
import org.eclipse.osgi.internal.framework.EquinoxContainer;
import org.eclipse.osgi.internal.hookregistry.HookConfigurator;
import org.eclipse.osgi.internal.hookregistry.HookRegistry;
import org.eclipse.osgi.internal.log.EquinoxLogServices;

public class CDSHookConfigurator implements HookConfigurator {

	private static final String REPORT_ERRORS = "j9.cds.reporterrors"; //$NON-NLS-1$
	private static final String DISABLE_CDS = "j9.cds.disable"; //$NON-NLS-1$
	private static final String OLD_CDS_CONFIGURATOR = "com.ibm.cds.CDSHookConfigurator"; //$NON-NLS-1$
	private static final String J9_SHARED_CLASS_HELPER_CLASS = "com.ibm.oti.shared.SharedClassHelperFactory"; //$NON-NLS-1$

	@Override
	public void addHooks(HookRegistry hookRegistry) {
		boolean disableCDS = Boolean.valueOf(hookRegistry.getConfiguration().getProperty(DISABLE_CDS));
		if (disableCDS) {
			return;
		}
		// check for the external com.ibm.cds system.bundle fragment
		try {
			Class.forName(OLD_CDS_CONFIGURATOR);
			// the old com.ibm.cds fragment is installed; disable build-in one
			return;
		} catch (ClassNotFoundException e) {
			// expected
		}
		try {
			Class.forName(J9_SHARED_CLASS_HELPER_CLASS);
		} catch (ClassNotFoundException e) {
			boolean reportErrors = Boolean.valueOf(hookRegistry.getConfiguration().getProperty(REPORT_ERRORS));
			// not running on J9
			if (reportErrors) {
				EquinoxContainer container = hookRegistry.getContainer();
				EquinoxLogServices logServices = container.getLogServices();
				logServices.log(EquinoxContainer.NAME, FrameworkLogEntry.WARNING, "The J9 Class Sharing Adaptor will not work in this configuration. You are not running on a J9 Java VM.", null); //$NON-NLS-1$
			}
			return;
		}

		new CDSHookImpls().registerHooks(hookRegistry);
	}

}