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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) 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:
 *     PARC     initial implementation
 * ******************************************************************/

package org.aspectj.weaver.patterns;

import java.io.IOException;
import java.util.Map;

import org.aspectj.bridge.MessageUtil;
import org.aspectj.util.FuzzyBoolean;
import org.aspectj.weaver.CompressingDataOutputStream;
import org.aspectj.weaver.ISourceContext;
import org.aspectj.weaver.IntMap;
import org.aspectj.weaver.ResolvedType;
import org.aspectj.weaver.Shadow;
import org.aspectj.weaver.UnresolvedType;
import org.aspectj.weaver.VersionedDataInputStream;
import org.aspectj.weaver.WeaverMessages;
import org.aspectj.weaver.World;
import org.aspectj.weaver.ast.Literal;
import org.aspectj.weaver.ast.Test;

/**
 * This is a kind of KindedPointcut. This belongs either in a hierarchy with it or in a new place to share code with other potential
 * future statement-level pointcuts like synchronized and throws
 */
public class HandlerPointcut extends Pointcut {
	TypePattern exceptionType;

	private static final int MATCH_KINDS = Shadow.ExceptionHandler.bit;

	public HandlerPointcut(TypePattern exceptionType) {
		this.exceptionType = exceptionType;
		this.pointcutKind = HANDLER;
	}

	public int couldMatchKinds() {
		return MATCH_KINDS;
	}

	public FuzzyBoolean fastMatch(FastMatchInfo type) {
		// ??? should be able to do better by finding all referenced types in type
		return FuzzyBoolean.MAYBE;
	}

	protected FuzzyBoolean matchInternal(Shadow shadow) {
		if (shadow.getKind() != Shadow.ExceptionHandler) {
			return FuzzyBoolean.NO;
		}

		exceptionType.resolve(shadow.getIWorld());

		// we know we have exactly one parameter since we're checking an exception handler
		return exceptionType.matches(shadow.getSignature().getParameterTypes()[0].resolve(shadow.getIWorld()), TypePattern.STATIC);
	}

	public Pointcut parameterizeWith(Map typeVariableMap, World w) {
		HandlerPointcut ret = new HandlerPointcut(exceptionType.parameterizeWith(typeVariableMap, w));
		ret.copyLocationFrom(this);
		return ret;
	}

	public boolean equals(Object other) {
		if (!(other instanceof HandlerPointcut)) {
			return false;
		}
		HandlerPointcut o = (HandlerPointcut) other;
		return o.exceptionType.equals(this.exceptionType);
	}

	public int hashCode() {
		int result = 17;
		result = 37 * result + exceptionType.hashCode();
		return result;
	}

	public String toString() {
		StringBuilder buf = new StringBuilder();
		buf.append("handler(");
		buf.append(exceptionType.toString());
		buf.append(")");
		return buf.toString();
	}

	public void write(CompressingDataOutputStream s) throws IOException {
		s.writeByte(Pointcut.HANDLER);
		exceptionType.write(s);
		writeLocation(s);
	}

	public static Pointcut read(VersionedDataInputStream s, ISourceContext context) throws IOException {
		HandlerPointcut ret = new HandlerPointcut(TypePattern.read(s, context));
		ret.readLocation(context, s);
		return ret;
	}

	// XXX note: there is no namebinding in any kinded pointcut.
	// still might want to do something for better error messages
	// We want to do something here to make sure we don't sidestep the parameter
	// list in capturing type identifiers.
	public void resolveBindings(IScope scope, Bindings bindings) {
		exceptionType = exceptionType.resolveBindings(scope, bindings, false, false);
		boolean invalidParameterization = false;
		if (exceptionType.getTypeParameters().size() > 0) {
			invalidParameterization = true;
		}
		UnresolvedType exactType = exceptionType.getExactType();
		if (exactType != null && exactType.isParameterizedType()) {
			invalidParameterization = true;
		}
		if (invalidParameterization) {
			// no parameterized or generic types for handler
			scope.message(MessageUtil.error(WeaverMessages.format(WeaverMessages.HANDLER_PCD_DOESNT_SUPPORT_PARAMETERS),
					getSourceLocation()));
		}
		// XXX add error if exact binding and not an exception
	}

	protected Test findResidueInternal(Shadow shadow, ExposedState state) {
		return match(shadow).alwaysTrue() ? Literal.TRUE : Literal.FALSE;
	}

	public Pointcut concretize1(ResolvedType inAspect, ResolvedType declaringType, IntMap bindings) {
		Pointcut ret = new HandlerPointcut(exceptionType);
		ret.copyLocationFrom(this);
		return ret;
	}

	public Object accept(PatternNodeVisitor visitor, Object data) {
		return visitor.visit(this, data);
	}

	@Override
	public Object traverse(PatternNodeVisitor visitor, Object data) {
		Object ret = accept(visitor, data);
		if (this.exceptionType != null)
			this.exceptionType.traverse(visitor, ret);
		return ret;
	}
}