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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.util.FuzzyBoolean;
import org.aspectj.weaver.AjcMemberMaker;
import org.aspectj.weaver.CompressingDataOutputStream;
import org.aspectj.weaver.ISourceContext;
import org.aspectj.weaver.ResolvedMember;
import org.aspectj.weaver.ResolvedType;
import org.aspectj.weaver.Shadow;
import org.aspectj.weaver.UnresolvedType;
import org.aspectj.weaver.VersionedDataInputStream;
import org.aspectj.weaver.World;
import org.aspectj.weaver.ast.Expr;
import org.aspectj.weaver.ast.Literal;
import org.aspectj.weaver.ast.Test;

public class PerSingleton extends PerClause {

	private ResolvedMember perSingletonAspectOfMethod;

	public PerSingleton() {
	}

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

	public int couldMatchKinds() {
		return Shadow.ALL_SHADOW_KINDS_BITS;
	}

	public FuzzyBoolean fastMatch(FastMatchInfo type) {
		return FuzzyBoolean.YES;
	}

	protected FuzzyBoolean matchInternal(Shadow shadow) {
		return FuzzyBoolean.YES;
	}

	public void resolveBindings(IScope scope, Bindings bindings) {
		// this method intentionally left blank
	}

	public Pointcut parameterizeWith(Map typeVariableMap, World w) {
		return this;
	}

	public Test findResidueInternal(Shadow shadow, ExposedState state) {
		// TODO: the commented code is for slow Aspects.aspectOf() style - keep
		// or remove
		//
		// Expr myInstance =
		// Expr.makeCallExpr(AjcMemberMaker.perSingletonAspectOfMethod(inAspect),
		// Expr.NONE, inAspect);
		//
		// state.setAspectInstance(myInstance);
		//
		// // we have no test
		// // a NoAspectBoundException will be thrown if we need an instance of
		// this
		// // aspect before we are bound
		// return Literal.TRUE;
		// if (!Ajc5MemberMaker.isSlowAspect(inAspect)) {
		if (perSingletonAspectOfMethod == null) {
			// Build this just once
			perSingletonAspectOfMethod = AjcMemberMaker.perSingletonAspectOfMethod(inAspect);
		}
		Expr myInstance = Expr.makeCallExpr(perSingletonAspectOfMethod, Expr.NONE, inAspect);

		state.setAspectInstance(myInstance);

		// we have no test
		// a NoAspectBoundException will be thrown if we need an instance of
		// this
		// aspect before we are bound
		return Literal.TRUE;
		// } else {
		// CallExpr callAspectOf =Expr.makeCallExpr(
		// Ajc5MemberMaker.perSingletonAspectOfMethod(inAspect),
		// new Expr[]{
		// Expr.makeStringConstantExpr(inAspect.getName(), inAspect),
		// //FieldGet is using ResolvedType and I don't need that here
		// new FieldGetOn(Member.ajClassField, shadow.getEnclosingType())
		// },
		// inAspect
		// );
		// Expr castedCallAspectOf = new CastExpr(callAspectOf,
		// inAspect.getName());
		// state.setAspectInstance(castedCallAspectOf);
		// return Literal.TRUE;
		// }
	}

	public PerClause concretize(ResolvedType inAspect) {
		PerSingleton ret = new PerSingleton();

		ret.copyLocationFrom(this);

		World world = inAspect.getWorld();

		ret.inAspect = inAspect;

		// ATAJ: add a munger to add the aspectOf(..) to the @AJ aspects
		if (inAspect.isAnnotationStyleAspect() && !inAspect.isAbstract()) {
			// TODO will those change be ok if we add a serializable aspect ?
			// dig:
			// "can't be Serializable/Cloneable unless -XserializableAspects"
			if (getKind() == SINGLETON) { // pr149560
				inAspect.crosscuttingMembers.addTypeMunger(world.getWeavingSupport().makePerClauseAspect(inAspect, getKind()));
			} else {
				inAspect.crosscuttingMembers.addLateTypeMunger(world.getWeavingSupport().makePerClauseAspect(inAspect, getKind()));
			}
		}

		// ATAJ inline around advice support
		if (inAspect.isAnnotationStyleAspect() && !inAspect.getWorld().isXnoInline()) {
			inAspect.crosscuttingMembers.addTypeMunger(world.getWeavingSupport().createAccessForInlineMunger(inAspect));
		}

		return ret;
	}

	public void write(CompressingDataOutputStream s) throws IOException {
		SINGLETON.write(s);
		writeLocation(s);
	}

	public static PerClause readPerClause(VersionedDataInputStream s, ISourceContext context) throws IOException {
		PerSingleton ret = new PerSingleton();
		ret.readLocation(context, s);
		return ret;
	}

	public PerClause.Kind getKind() {
		return SINGLETON;
	}

	public String toString() {
		return "persingleton(" + inAspect + ")";
	}

	public String toDeclarationString() {
		return "";
	}

	public boolean equals(Object other) {
		if (!(other instanceof PerSingleton)) {
			return false;
		}
		PerSingleton pc = (PerSingleton) other;
		return ((pc.inAspect == null) ? (inAspect == null) : pc.inAspect.equals(inAspect));
	}

	public int hashCode() {
		int result = 17;
		result = 37 * result + ((inAspect == null) ? 0 : inAspect.hashCode());
		return result;
	}

}