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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) 2016 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
 ******************************************************************************/
package org.eclipse.osgi.internal.log;

import org.osgi.framework.ServiceReference;

public class Arguments {
	private final Object[] arguments;
	private final ServiceReference serviceReference;
	private final Throwable throwable;

	public Arguments(Object... arguments) {
		if (arguments == null || arguments.length == 0) {
			this.arguments = new Object[0];
			serviceReference = null;
			throwable = null;
			return;
		}
		int length = arguments.length;
		ServiceReference context = null;
		Throwable exception = null;
		Object object = arguments[arguments.length - 1];
		if (object instanceof Throwable || object instanceof ServiceReference) {
			length--;
			if (object instanceof Throwable) {
				exception = (Throwable) object;
			} else {
				context = (ServiceReference) object;
			}
			if (arguments.length > 1) {
				object = arguments[arguments.length - 2];
				if ((object instanceof ServiceReference && context == null) || (object instanceof Throwable && exception == null)) {
					length--;
					if (object instanceof Throwable) {
						exception = (Throwable) object;
					} else {
						context = (ServiceReference) object;
					}
				}
			}
		}
		serviceReference = context;
		throwable = exception;
		this.arguments = new Object[length];
		System.arraycopy(arguments, 0, this.arguments, 0, length);
	}

	public Object[] arguments() {
		return arguments;
	}

	public boolean isEmpty() {
		return arguments == null || arguments.length == 0;
	}

	public ServiceReference serviceReference() {
		return serviceReference;
	}

	public Throwable throwable() {
		return throwable;
	}
}