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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.HashSet;
import java.util.Set;

import org.aspectj.lang.reflect.MethodSignature;

class MethodSignatureImpl extends CodeSignatureImpl implements MethodSignature {
	private Method method;
	Class returnType;

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

	MethodSignatureImpl(String stringRep) {
		super(stringRep);
	}

	/* name is consistent with reflection API */
	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(getName());
		sm.addSignature(buf, getParameterTypes());
		sm.addThrows(buf, getExceptionTypes());
		return buf.toString();
	}

	/*
	 * (non-Javadoc)
	 *
	 * @see org.aspectj.lang.reflect.MemberSignature#getAccessibleObject()
	 */
	public Method getMethod() {
		if (method == null) {
			Class dtype = getDeclaringType();
			try {
				method = dtype.getDeclaredMethod(getName(), getParameterTypes());
			} catch (NoSuchMethodException nsmEx) {
				// pr154427 - search
				Set> searched = new HashSet<>();
				searched.add(dtype); // avoids another getDeclaredMethod() on dtype
				method = search(dtype, getName(), getParameterTypes(), searched);
			}
		}
		return method;
	}

	/**
	 * Hunt for a method up the hierarchy for a specified type.
	 *
	 * @param type the type on which to look for the method
	 * @param name the name of the method
	 * @param params the parameters of the method
	 * @param searched a set of types already searched to avoid looking at anything twice
	 * @return the method if found, or null if not found
	 */
	private Method search(Class type, String name, Class[] params, Set> searched) {
		if (type == null) {
			return null;
		}
		if (!searched.contains(type)) {
			searched.add(type);
			try {
				return type.getDeclaredMethod(name, params);
			} catch (NoSuchMethodException nsme) {
				// drop through and check superclass and interfaces
			}
		}
		Method m = search(type.getSuperclass(), name, params, searched);
		if (m != null) {
			return m;
		}
		Class[] superinterfaces = type.getInterfaces();
		if (superinterfaces != null) {
			for (Class superinterface : superinterfaces) {
				m = search(superinterface, name, params, searched);
				if (m != null) {
					return m;
				}
			}
		}
		return null;
	}
}