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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) 2003, 2017 IBM Corporation 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/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/

package org.eclipse.osgi.internal.loader;

import java.io.IOException;
import java.net.URL;
import java.util.Collection;
import java.util.Enumeration;
import org.eclipse.osgi.container.Module;
import org.eclipse.osgi.container.ModuleContainerAdaptor.ContainerEvent;
import org.eclipse.osgi.container.ModuleRevision;
import org.eclipse.osgi.container.ModuleWiring;
import org.eclipse.osgi.internal.framework.EquinoxConfiguration;
import org.eclipse.osgi.internal.framework.EquinoxContainer;
import org.eclipse.osgi.storage.BundleInfo.Generation;
import org.osgi.framework.BundleException;

/**
 * The System Bundle's BundleLoader.  This BundleLoader is used by ImportClassLoaders
 * to load a resource that is exported by the System Bundle.
 */
public class SystemBundleLoader extends BundleLoader {
	public static final String EQUINOX_EE = "x-equinox-ee"; //$NON-NLS-1$
	final ClassLoader classLoader;
	final ModuleClassLoader moduleClassLoader;

	public SystemBundleLoader(ModuleWiring wiring, EquinoxContainer container, ClassLoader frameworkLoader) {
		super(wiring, container, frameworkLoader.getParent());
		this.classLoader = frameworkLoader;
		this.moduleClassLoader = new SystemModuleClassLoader(classLoader.getParent(), container.getConfiguration(), this, (Generation) wiring.getRevision().getRevisionInfo());
	}

	/**
	 * The ClassLoader that loads OSGi framework classes is used to find the class.
	 * This method never gets called because there is no BundleClassLoader for the framework.
	 */
	@Override
	public Class findClass(String name) throws ClassNotFoundException {
		Class result = findLocalClass(name);
		if (result == null)
			throw new ClassNotFoundException(name);
		return result;
	}

	/**
	 * The ClassLoader that loads OSGi framework classes is used to find the class.
	 */
	@Override
	public Class findLocalClass(String name) {
		try {
			return classLoader.loadClass(name);
		} catch (ClassNotFoundException e) {
			// do nothing
			return null;
		}
	}

	/**
	 * The ClassLoader that loads OSGi framework classes is used to find the resource.
	 */
	@Override
	public URL findLocalResource(String name) {
		return classLoader.getResource(name);
	}

	/**
	 * The ClassLoader that loads OSGi framework classes is used to find the resource.
	 */
	@Override
	public Enumeration findLocalResources(String name) {
		try {
			return classLoader.getResources(name);
		} catch (IOException e) {
			// do nothing
			return null;
		}
	}

	/**
	 * The ClassLoader that loads OSGi framework classes is used to find the resource.
	 * This method never gets called because there is no ModuleClassLoader for the framework.
	 */
	@Override
	public URL findResource(String name) {
		return findLocalResource(name);
	}

	/**
	 * The ClassLoader that loads OSGi framework classes is used to find the resource.
	 * This method never gets called because there is no ModuleClassLoader for the framework.
	 * @throws IOException
	 */
	@Override
	public Enumeration findResources(String name) throws IOException {
		return findLocalResources(name);
	}

	@Override
	public ClassLoader getClassLoader() {
		return classLoader;
	}

	@Override
	public ModuleClassLoader getModuleClassLoader() {
		return moduleClassLoader;
	}

	@Override
	void loadClassLoaderFragments(Collection fragments) {
		moduleClassLoader.loadFragments(fragments);
	}

	class SystemModuleClassLoader extends EquinoxClassLoader {

		public SystemModuleClassLoader(ClassLoader parent, EquinoxConfiguration configuration, BundleLoader delegate, Generation generation) {
			super(parent, configuration, delegate, generation);
		}

		@Override
		protected Class loadClass(String name, boolean resolve) throws ClassNotFoundException {
			return SystemBundleLoader.this.findClass(name);
		}

		@Override
		public void loadFragments(Collection fragments) {
			Module systemModule = getWiring().getRevision().getRevisions().getModule();
			try {
				this.getGeneration().getBundleInfo().getStorage().getExtensionInstaller().addExtensionContent(fragments, systemModule);
			} catch (BundleException e) {
				systemModule.getContainer().getAdaptor().publishContainerEvent(ContainerEvent.ERROR, systemModule, e);
			}
			getClasspathManager().loadFragments(fragments);
		}
	}
}