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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, 2012 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.framework.console;

import java.util.Dictionary;
import org.osgi.framework.Bundle;

/**
 * A command interpreter is a shell that can interpret command
 * lines. This object is passed as parameter when a CommandProvider
 * is invoked.
 * 
 * This interface is not intended to be implemented by clients.
 * 
 * @since 3.1
 * @noimplement This interface is not intended to be implemented by clients.
 */
public interface CommandInterpreter {
	/**
	 * Get the next argument in the input.  If no arguments are left then null is returned.
	 *
	 * E.g. if the commandline is hello world, the _hello method
	 * will get "world" as the first argument.
	 * @return the next argument or null if no arguments are left.
	 */
	public String nextArgument();

	/**
	 * Execute a command line as if it came from the end user
	 * and return the result.
	 * @param cmd The command line to execute.
	 * @return the result of the command.
	 */
	public Object execute(String cmd);

	/**
	 * Prints an object to the outputstream
	 *
	 * @param o	the object to be printed
	 */
	public void print(Object o);

	/**
	 * Prints an empty line to the outputstream
	 */
	public void println();

	/**
	 * Prints an object to the output medium (appended with newline character).
	 * 
	 * If running on the target environment the user is prompted with '--more'
	 * if more than the configured number of lines have been printed without user prompt.
	 * That way the user of the program has control over the scrolling.
	 * 
	 * For this to work properly you should not embedded "\n" etc. into the string.
	 *
	 * @param	o	the object to be printed
	 */
	public void println(Object o);

	/**
	 * Print a stack trace including nested exceptions.
	 * @param t The offending exception
	 */
	public void printStackTrace(Throwable t);

	/**
	 * Prints the given dictionary sorted by keys.
	 *
	 * @param dic	the dictionary to print
	 * @param title	the header to print above the key/value pairs
	 */
	public void printDictionary(Dictionary dic, String title);

	/**
	 * Prints the given bundle resource if it exists
	 *
	 * @param bundle	the bundle containing the resource
	 * @param resource	the resource to print
	 */
	public void printBundleResource(Bundle bundle, String resource);
}