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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) 2005, 2013 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.buddy;

import java.io.IOException;
import java.net.URL;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import org.eclipse.osgi.container.ModuleCapability;
import org.eclipse.osgi.container.ModuleWiring;
import org.eclipse.osgi.container.namespaces.EquinoxModuleDataNamespace;
import org.eclipse.osgi.internal.loader.BundleLoader;

/**
 *Registered policy is an implementation of a buddy policy.
 * It is responsible for looking up a class in the bundles (registrant) that declare interest in the bundle that require the buddy loading.
 * Note that the registrants must have a direct dependency on the bundle needing buddy.
 */
public class RegisteredPolicy extends DependentPolicy {

	public RegisteredPolicy(BundleLoader requester) {
		super(requester);

		//Filter the dependents;
		if (allDependents == null)
			return;

		String requesterName = requester.getWiring().getRevision().getSymbolicName();
		for (Iterator iter = allDependents.iterator(); iter.hasNext();) {
			ModuleWiring wiring = iter.next();
			List moduleDatas = wiring.getRevision().getModuleCapabilities(EquinoxModuleDataNamespace.MODULE_DATA_NAMESPACE);
			@SuppressWarnings("unchecked")
			List registeredList = (List) (moduleDatas.isEmpty() ? null : moduleDatas.get(0).getAttributes().get(EquinoxModuleDataNamespace.CAPABILITY_BUDDY_REGISTERED));
			if (registeredList == null || registeredList.isEmpty()) {
				iter.remove();
			} else {
				boolean contributes = false;
				for (String registeredName : registeredList) {
					if (registeredName.equals(requesterName)) {
						contributes = true;
						break;
					}
				}
				if (!contributes) {
					iter.remove();
				}
			}
		}

		//After the filtering, if nothing is left then null out the variable for optimization
		if (allDependents.size() == 0)
			allDependents = null;
	}

	@Override
	public Class loadClass(String name) {
		if (allDependents == null) {
			return null;
		}
		int size = allDependents.size();
		for (int i = 0; i < size; i++) {
			ModuleWiring searchWiring = allDependents.get(i);
			BundleLoader searchLoader = (BundleLoader) searchWiring.getModuleLoader();
			if (searchLoader != null) {
				Class result = searchLoader.findClassNoParentNoException(name);
				if (result != null) {
					return result;
				}
			}
		}
		return null;
	}

	@Override
	public URL loadResource(String name) {
		if (allDependents == null)
			return null;

		URL result = null;
		int size = allDependents.size();
		for (int i = 0; i < size && result == null; i++) {
			ModuleWiring searchWiring = allDependents.get(i);
			BundleLoader searchLoader = (BundleLoader) searchWiring.getModuleLoader();
			if (searchLoader != null) {
				result = searchLoader.findResource(name);
			}
		}
		return result;
	}

	@Override
	public Enumeration loadResources(String name) {
		if (allDependents == null)
			return null;

		Enumeration results = null;
		int size = allDependents.size();
		for (int i = 0; i < size; i++) {
			try {
				ModuleWiring searchWiring = allDependents.get(i);
				BundleLoader searchLoader = (BundleLoader) searchWiring.getModuleLoader();
				if (searchLoader != null) {
					results = BundleLoader.compoundEnumerations(results, searchLoader.findResources(name));
				}
			} catch (IOException e) {
				//Ignore and keep looking
			}
		}
		return results;
	}

	@Override
	public void addListResources(Set results, String path, String filePattern, int options) {
		if (allDependents == null) {
			return;
		}

		int size = allDependents.size();
		for (int i = 0; i < size; i++) {
			ModuleWiring searchWiring = allDependents.get(i);
			results.addAll(searchWiring.listResources(path, filePattern, options));
		}
	}
}