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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) 1999-2001 Xerox Corporation,
 *               2002 Palo Alto Research Center, Incorporated (PARC).
 * 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:
 *     Xerox/PARC     initial implementation
 * ******************************************************************/


package org.aspectj.runtime.reflect;

import java.lang.reflect.Method;
import java.util.StringTokenizer;

import org.aspectj.lang.reflect.AdviceSignature;

class AdviceSignatureImpl extends CodeSignatureImpl implements AdviceSignature {
    Class returnType;
	private Method adviceMethod = null;

    AdviceSignatureImpl(int modifiers, String name, Class declaringType,
        Class[] parameterTypes, String[] parameterNames, Class[] exceptionTypes,
        Class returnType)
    {
        super(modifiers, name, declaringType, parameterTypes, parameterNames,
            exceptionTypes);
        this.returnType = returnType;
    }

    AdviceSignatureImpl(String stringRep) {
        super(stringRep);
    }
    /* name is consistent with reflection API
    before and after always return Void.TYPE
    (some around also return Void.Type)      */
    public Class getReturnType() {
        if (returnType == null) returnType = extractType(6);
        return returnType;
    }

    protected String createToString(StringMaker sm) {
        StringBuffer buf = new StringBuffer();
//        buf.append(sm.makeModifiersString(getModifiers()));
        if (sm.includeArgs) buf.append(sm.makeTypeName(getReturnType()));
        if (sm.includeArgs) buf.append(" ");
        buf.append(sm.makePrimaryTypeName(getDeclaringType(),getDeclaringTypeName()));
        buf.append(".");
        buf.append(toAdviceName(getName()));
        sm.addSignature(buf, getParameterTypes());
        sm.addThrows(buf, getExceptionTypes());
        return buf.toString();
    }

    private String toAdviceName(String methodName) {
    		if (methodName.indexOf('$') == -1) return methodName;
    		StringTokenizer strTok = new StringTokenizer(methodName,"$");
    		while (strTok.hasMoreTokens()) {
    			String token = strTok.nextToken();
    			if ( token.startsWith("before") ||
    				 token.startsWith("after") ||
    				 token.startsWith("around") ) return token;
    		}
    		return methodName;
    }

    /* (non-Javadoc)
	 * @see org.aspectj.runtime.reflect.MemberSignatureImpl#createAccessibleObject()
	 */
	public Method getAdvice() {
		if (adviceMethod == null) {
			try {
				adviceMethod = getDeclaringType().getDeclaredMethod(getName(),getParameterTypes());
			} catch (Exception ex) {
				; // nothing we can do, caller will see null
			}
		}
		return adviceMethod;
	}
}