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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) 2000, 2006 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.core.internal.registry;

import java.util.Arrays;
import java.util.Map;
import org.eclipse.core.runtime.IExtensionDelta;
import org.eclipse.core.runtime.IRegistryChangeEvent;

/**
 * A registry change event implementation. A filter can be specified. In that case, only
 * deltas for the selected host will be available to clients.
 */
public final class RegistryChangeEvent implements IRegistryChangeEvent {
	private final String filter;
	private final Map deltas;

	public RegistryChangeEvent(Map deltas, String filter) {
		this.deltas = deltas;
		this.filter = filter;
	}

	private RegistryDelta[] getHostDeltas() {
		// if there is a filter, return only the delta for the selected plug-in
		if (filter != null) {
			RegistryDelta singleDelta = getHostDelta(filter);
			return singleDelta == null ? new RegistryDelta[0] : new RegistryDelta[] {singleDelta};
		}
		// there is no filter - return all deltas
		return deltas.values().toArray(new RegistryDelta[deltas.size()]);
	}

	private RegistryDelta getHostDelta(String pluginId) {
		if (filter != null && !pluginId.equals(filter))
			return null;
		return (RegistryDelta) deltas.get(pluginId);
	}

	@Override
	public IExtensionDelta[] getExtensionDeltas() {
		RegistryDelta[] hostDeltas = getHostDeltas();
		if (hostDeltas.length == 0)
			return new IExtensionDelta[0];
		int extensionDeltasSize = 0;
		for (RegistryDelta hostDelta : hostDeltas) {
			extensionDeltasSize += hostDelta.getExtensionDeltasCount();
		}
		IExtensionDelta[] extensionDeltas = new IExtensionDelta[extensionDeltasSize];
		for (int i = 0, offset = 0; i < hostDeltas.length; i++) {
			IExtensionDelta[] hostExtDeltas = hostDeltas[i].getExtensionDeltas();
			System.arraycopy(hostExtDeltas, 0, extensionDeltas, offset, hostExtDeltas.length);
			offset += hostExtDeltas.length;
		}
		return extensionDeltas;
	}

	@Override
	public IExtensionDelta[] getExtensionDeltas(String hostName) {
		RegistryDelta hostDelta = getHostDelta(hostName);
		if (hostDelta == null)
			return new IExtensionDelta[0];
		return hostDelta.getExtensionDeltas();
	}

	@Override
	public IExtensionDelta[] getExtensionDeltas(String hostName, String extensionPoint) {
		RegistryDelta hostDelta = getHostDelta(hostName);
		if (hostDelta == null)
			return new IExtensionDelta[0];
		return hostDelta.getExtensionDeltas(hostName + '.' + extensionPoint);
	}

	@Override
	public IExtensionDelta getExtensionDelta(String hostName, String extensionPoint, String extension) {
		RegistryDelta hostDelta = getHostDelta(hostName);
		if (hostDelta == null)
			return null;
		return hostDelta.getExtensionDelta(hostName + '.' + extensionPoint, extension);
	}

	@Override
	public String toString() {
		return "RegistryChangeEvent:  " + Arrays.asList(getHostDeltas()); //$NON-NLS-1$
	}
}