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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;

import java.io.IOException;

/**
 * A privileged access munger is for handling privileged access to a member. It determines the names of the getter/setter that will
 * be used to access a private field in some type, or the special method that provides access to a private method.
 *
 * There are two syntax styles for field access, the older style was in use up to AspectJ 1.6.9 and involves long named getters and
 * setters which include the requesting aspect and the target type. The short style syntax is use from AspectJ 1.6.9 onwards is
 * simply 'ajc$get$<fieldname>' and 'ajc$set$<fieldname>' - as the requesting aspect isn't included in the name they can be shared
 * across aspects.
 */
public class PrivilegedAccessMunger extends ResolvedTypeMunger {

	public boolean shortSyntax = false;

	public PrivilegedAccessMunger(ResolvedMember member, boolean shortSyntax) {
		super(PrivilegedAccess, member);
		this.shortSyntax = shortSyntax;
	}

	@Override
	public void write(CompressingDataOutputStream s) throws IOException {
		throw new RuntimeException("should not be serialized");
	}

	public ResolvedMember getMember() {
		return getSignature();
	}

	@Override
	public ResolvedMember getMatchingSyntheticMember(Member member, ResolvedType aspectType) {
		ResolvedMember ret;
		// assert if shortSyntax then aspectType.getCompilerVersion()>=169
		if (getSignature().getKind() == Member.FIELD) {
			ret = AjcMemberMaker.privilegedAccessMethodForFieldGet(aspectType, getSignature(), shortSyntax);
			if (ResolvedType.matches(ret, member)) {
				return getSignature();
			}
			ret = AjcMemberMaker.privilegedAccessMethodForFieldSet(aspectType, getSignature(), shortSyntax);
			if (ResolvedType.matches(ret, member)) {
				return getSignature();
			}
		} else {
			// System.err.println("sig: " + getSignature());
			ret = AjcMemberMaker.privilegedAccessMethodForMethod(aspectType, getSignature());
			if (ResolvedType.matches(ret, member)) {
				return getSignature();
			}
		}
		return null;
	}

	@Override
	public boolean equals(Object other) {
		if (!(other instanceof PrivilegedAccessMunger)) {
			return false;
		}
		PrivilegedAccessMunger o = (PrivilegedAccessMunger) other;
		return kind.equals(o.kind)
				&& ((o.signature == null) ? (signature == null) : signature.equals(o.signature))
				&& ((o.declaredSignature == null) ? (declaredSignature == null) : declaredSignature.equals(o.declaredSignature))
				&& ((o.typeVariableAliases == null) ? (typeVariableAliases == null) : typeVariableAliases
						.equals(o.typeVariableAliases));
	}

	@Override
	public int hashCode() {
		int result = 17;
		result = 37 * result + kind.hashCode();
		result = 37 * result + ((signature == null) ? 0 : signature.hashCode());
		result = 37 * result + ((declaredSignature == null) ? 0 : declaredSignature.hashCode());
		result = 37 * result + ((typeVariableAliases == null) ? 0 : typeVariableAliases.hashCode());
		return result;
	}

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