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
/*******************************************************************************
 * 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;
	}
}