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The AspectJ weaver introduces advices to java classes
There is a newer version: 1.9.22
/* *******************************************************************
 * Copyright (c) 2005 Contributors.
 * All rights reserved. 
 * This program and the accompanying materials are made available 
 * under the terms of the Eclipse Public License v1.0 
 * which accompanies this distribution and is available at 
 * http://eclipse.org/legal/epl-v10.html 
 *  
 * Contributors: 
 *   Adrian Colyer			Initial implementation
 * ******************************************************************/
package org.aspectj.weaver;

import java.util.Collections;
import java.util.List;

import org.aspectj.bridge.ISourceLocation;
import org.aspectj.bridge.context.CompilationAndWeavingContext;

/**
 * When we try to resolve a type in the world that we require to be present, and then fail to find it, we return an instance of this
 * class. This class defers the production of the "can't find type error" until the first time that someone asks a question that
 * can't be answered solely from the signature. This enables the weaver to be more tolerant of missing types.
 * 
 */
public class MissingResolvedTypeWithKnownSignature extends ResolvedType {

	private static ResolvedMember[] NO_MEMBERS = new ResolvedMember[0];
	private static ResolvedType[] NO_TYPES = new ResolvedType[0];
	private boolean issuedCantFindTypeError = false;
	private boolean issuedJoinPointWarning = false;
	private boolean issuedMissingInterfaceWarning = false;

	/**
	 * @param signature
	 * @param world
	 */
	public MissingResolvedTypeWithKnownSignature(String signature, World world) {
		super(signature, world);
	}

	@Override
	public boolean isMissing() {
		return true;
	}

	/**
	 * @param signature
	 * @param signatureErasure
	 * @param world
	 */
	public MissingResolvedTypeWithKnownSignature(String signature, String signatureErasure, World world) {
		super(signature, signatureErasure, world);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.aspectj.weaver.ResolvedType#getDeclaredFields()
	 */
	@Override
	public ResolvedMember[] getDeclaredFields() {
		raiseCantFindType(WeaverMessages.CANT_FIND_TYPE_FIELDS);
		return NO_MEMBERS;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.aspectj.weaver.ResolvedType#getDeclaredMethods()
	 */
	@Override
	public ResolvedMember[] getDeclaredMethods() {
		raiseCantFindType(WeaverMessages.CANT_FIND_TYPE_METHODS);
		return NO_MEMBERS;
	}

	@Override
	public AnnotationAJ[] getAnnotations() {
		raiseCantFindType(WeaverMessages.CANT_FIND_TYPE_ANNOTATION);
		return AnnotationAJ.EMPTY_ARRAY;
	}

	@Override
	public ResolvedType[] getDeclaredInterfaces() {
		raiseCantFindType(WeaverMessages.CANT_FIND_TYPE_INTERFACES);
		return NO_TYPES;
	}

	@Override
	public ResolvedMember[] getDeclaredPointcuts() {
		raiseCantFindType(WeaverMessages.CANT_FIND_TYPE_POINTCUTS);
		return NO_MEMBERS;
	}

	@Override
	public ResolvedType getSuperclass() {
		raiseCantFindType(WeaverMessages.CANT_FIND_TYPE_SUPERCLASS);
		return ResolvedType.MISSING;
	}

	@Override
	public int getModifiers() {
		raiseCantFindType(WeaverMessages.CANT_FIND_TYPE_MODIFIERS);
		return 0;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.aspectj.weaver.ResolvedType#getSourceContext()
	 */
	@Override
	public ISourceContext getSourceContext() {
		return new ISourceContext() {

			@Override
			public ISourceLocation makeSourceLocation(IHasPosition position) {
				return null;
			}

			@Override
			public ISourceLocation makeSourceLocation(int line, int offset) {
				return null;
			}

			@Override
			public int getOffset() {
				return 0;
			}

			@Override
			public void tidy() {
			}

		};
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.aspectj.weaver.ResolvedType#isAssignableFrom(org.aspectj.weaver.ResolvedType)
	 */
	@Override
	public boolean isAssignableFrom(ResolvedType other) {
		raiseCantFindType(WeaverMessages.CANT_FIND_TYPE_ASSIGNABLE, other.getName());
		return false;
	}

	@Override
	public boolean isAssignableFrom(ResolvedType other, boolean allowMissing) {
		if (allowMissing) {
			return false;
		} else {
			return isAssignableFrom(other);
		}
	}
	
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.aspectj.weaver.ResolvedType#isCoerceableFrom(org.aspectj.weaver.ResolvedType)
	 */
	@Override
	public boolean isCoerceableFrom(ResolvedType other) {
		raiseCantFindType(WeaverMessages.CANT_FIND_TYPE_COERCEABLE, other.getName());
		return false;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.aspectj.weaver.AnnotatedElement#hasAnnotation(org.aspectj.weaver.UnresolvedType)
	 */
	@Override
	public boolean hasAnnotation(UnresolvedType ofType) {
		raiseCantFindType(WeaverMessages.CANT_FIND_TYPE_ANNOTATION);
		return false;
	}

	@Override
	public List getInterTypeMungers() {
		return Collections.EMPTY_LIST;
	}

	@Override
	public List getInterTypeMungersIncludingSupers() {
		return Collections.EMPTY_LIST;
	}

	@Override
	public List getInterTypeParentMungers() {
		return Collections.EMPTY_LIST;
	}

	@Override
	public List getInterTypeParentMungersIncludingSupers() {
		return Collections.EMPTY_LIST;
	}

	@Override
	protected void collectInterTypeMungers(List collector) {
		return;
	}

	public void raiseWarningOnJoinPointSignature(String signature) {
		if (issuedJoinPointWarning) {
			return;
		}
		String message = WeaverMessages.format(WeaverMessages.CANT_FIND_TYPE_JOINPOINT, getName(), signature);
		message += "\n" + CompilationAndWeavingContext.getCurrentContext();
		world.getLint().cantFindTypeAffectingJoinPointMatch.signal(message, null);
		// MessageUtil.warn(world.getMessageHandler(),message);
		issuedJoinPointWarning = true;
	}

	public void raiseWarningOnMissingInterfaceWhilstFindingMethods() {
		if (issuedMissingInterfaceWarning) {
			return;
		}
		String message = WeaverMessages.format(WeaverMessages.CANT_FIND_TYPE_INTERFACE_METHODS, getName(), signature);
		message += "\n" + CompilationAndWeavingContext.getCurrentContext();
		world.getLint().cantFindTypeAffectingJoinPointMatch.signal(message, null);
		// MessageUtil.warn(world.getMessageHandler(),message);
		issuedMissingInterfaceWarning = true;
	}

	private void raiseCantFindType(String key) {
		if (!world.getLint().cantFindType.isEnabled()) {
			return;
		}
		if (issuedCantFindTypeError) {
			return;
		}
		String message = WeaverMessages.format(key, getName());
		message += "\n" + CompilationAndWeavingContext.getCurrentContext();
		world.getLint().cantFindType.signal(message, null);
		// MessageUtil.error(world.getMessageHandler(),message);
		issuedCantFindTypeError = true;
	}

	private void raiseCantFindType(String key, String insert) {
		if (issuedCantFindTypeError) {
			return;
		}
		String message = WeaverMessages.format(key, getName(), insert);
		message += "\n" + CompilationAndWeavingContext.getCurrentContext();
		world.getLint().cantFindType.signal(message, null);
		// MessageUtil.error(world.getMessageHandler(),message);
		issuedCantFindTypeError = true;
	}

}