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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 Contributors.
 * All rights reserved.
 * This program and the accompanying materials are made available
 * under the terms of the Eclipse Public License v 2.0
 * which accompanies this distribution and is available at
 * https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.txt
 *
 * Contributors:
 *   Adrian Colyer			Initial implementation
 * ******************************************************************/
package org.aspectj.internal.lang.reflect;

import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;
import java.util.StringTokenizer;

import org.aspectj.lang.reflect.AjTypeSystem;

/**
 * @author colyer
 * Helper class for converting type representations in Strings into java.lang.reflect.Types.
 */
public class StringToType {

	public static Type[] commaSeparatedListToTypeArray(String typeNames, Class classScope)
	throws ClassNotFoundException {
		StringTokenizer strTok = new StringTokenizer(typeNames,",");
		Type[] ret = new Type[strTok.countTokens()];
		int index = 0;
		//outer:
			while (strTok.hasMoreTokens()) {
			String typeName = strTok.nextToken().trim();
			ret[index++] = stringToType(typeName, classScope);
		}
		return ret;
	}

	public static Type stringToType(String typeName, Class classScope)
	throws ClassNotFoundException {
		try {
			if (!typeName.contains("<")) {
				return AjTypeSystem.getAjType(Class.forName(typeName,false,classScope.getClassLoader()));
			} else {
				return makeParameterizedType(typeName,classScope);
			}
		} catch (ClassNotFoundException e) {
			// could be a type variable
			TypeVariable[] tVars = classScope.getTypeParameters();
			for (TypeVariable tVar : tVars) {
				if (tVar.getName().equals(typeName)) {
					return tVar;
				}
			}
			throw new ClassNotFoundException(typeName);
		}
	}

	private static Type makeParameterizedType(String typeName, Class classScope)
	throws ClassNotFoundException {
		int paramStart = typeName.indexOf('<');
		String baseName = typeName.substring(0, paramStart);
		final Class baseClass = Class.forName(baseName,false,classScope.getClassLoader());
		int paramEnd = typeName.lastIndexOf('>');
		String params = typeName.substring(paramStart+1,paramEnd);
		final Type[] typeParams = commaSeparatedListToTypeArray(params,classScope);
		return new ParameterizedType() {

			public Type[] getActualTypeArguments() {
				return typeParams;
			}

			public Type getRawType() {
				return baseClass;
			}

			public Type getOwnerType() {
				return baseClass.getEnclosingClass();
			}
		};
	}
}