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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.
/* *******************************************************************
* Copyright (c) 2008 Contributors
* 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:
* Andy Clement initial implementation
* ******************************************************************/
package org.aspectj.weaver.bcel;
import java.util.List;
import org.aspectj.apache.bcel.classfile.annotation.AnnotationGen;
import org.aspectj.apache.bcel.classfile.annotation.ElementValue;
import org.aspectj.apache.bcel.classfile.annotation.EnumElementValue;
import org.aspectj.apache.bcel.classfile.annotation.NameValuePair;
import org.aspectj.apache.bcel.classfile.annotation.SimpleElementValue;
import org.aspectj.apache.bcel.generic.InstructionFactory;
import org.aspectj.apache.bcel.generic.InstructionList;
import org.aspectj.apache.bcel.generic.Type;
import org.aspectj.weaver.AnnotationAJ;
import org.aspectj.weaver.Member;
import org.aspectj.weaver.ResolvedMember;
import org.aspectj.weaver.ResolvedType;
import org.aspectj.weaver.Shadow;
import org.aspectj.weaver.UnresolvedType;
/**
* An AnnotationAccessVar represents access to a particular annotation, whilst an AnnotationAccessFieldVar represents access to a
* specific field of that annotation.
*
* @author Andy Clement
*/
class AnnotationAccessFieldVar extends BcelVar {
private AnnotationAccessVar annoAccessor;
private ResolvedType annoFieldOfInterest;
private String name;
private int elementValueType;
public AnnotationAccessFieldVar(AnnotationAccessVar aav, ResolvedType annoFieldOfInterest, String name) {
super(annoFieldOfInterest, 0);
this.annoAccessor = aav;
this.name = name;
String sig = annoFieldOfInterest.getSignature();
if (sig.length() == 1) {
switch (sig.charAt(0)) {
case 'I':
elementValueType = ElementValue.PRIMITIVE_INT;
break;
default:
throw new IllegalStateException(sig);
}
} else if (sig.equals("Ljava/lang/String;")) {
elementValueType = ElementValue.STRING;
} else if (annoFieldOfInterest.isEnum()) {
elementValueType = ElementValue.ENUM_CONSTANT;
} else {
throw new IllegalStateException(sig);
}
this.annoFieldOfInterest = annoFieldOfInterest;
}
@Override
public void appendLoadAndConvert(InstructionList il, InstructionFactory fact, ResolvedType toType) {
// Only possible to do annotation field value extraction at MethodExecution
if (annoAccessor.getKind() != Shadow.MethodExecution) {
return;
}
String annotationOfInterestSignature = annoAccessor.getType().getSignature();
// So we have an entity that has an annotation on and within it is the value we want
Member holder = annoAccessor.getMember();
AnnotationAJ[] annos = holder.getAnnotations();
for (AnnotationAJ anno : annos) {
AnnotationGen annotation = ((BcelAnnotation) anno).getBcelAnnotation();
boolean foundValueInAnnotationUsage = false;
if (annotation.getTypeSignature().equals(annotationOfInterestSignature)) {
ResolvedMember[] annotationFields = toType.getWorld()
.resolve(UnresolvedType.forSignature(annotation.getTypeSignature())).getDeclaredMethods();
// Check how many fields there are of the type we are looking for. If >1 then we'll need
// to use the name to choose the right one
int countOfType = 0;
for (ResolvedMember annotationField : annotationFields) {
if (annotationField.getType().equals(annoFieldOfInterest)) {
countOfType++;
}
}
// this block deals with an annotation that has actual values (i.e. not falling back to default values)
List nvps = annotation.getValues();
for (NameValuePair nvp : nvps) {
// If multiple of the same type, match by name
if (countOfType > 1) {
if (!nvp.getNameString().equals(name)) {
continue;
}
}
ElementValue o = nvp.getValue();
if (o.getElementValueType() != elementValueType) {
continue;
}
if (o instanceof EnumElementValue) {
EnumElementValue v = (EnumElementValue) o;
String s = v.getEnumTypeString();
ResolvedType rt = toType.getWorld().resolve(UnresolvedType.forSignature(s));
if (rt.equals(toType)) {
il.append(fact.createGetStatic(rt.getName(), v.getEnumValueString(), Type.getType(rt.getSignature())));
foundValueInAnnotationUsage = true;
}
} else if (o instanceof SimpleElementValue) {
SimpleElementValue v = (SimpleElementValue) o;
switch (v.getElementValueType()) {
case ElementValue.PRIMITIVE_INT:
il.append(fact.createConstant(v.getValueInt()));
foundValueInAnnotationUsage = true;
break;
case ElementValue.STRING:
il.append(fact.createConstant(v.getValueString()));
foundValueInAnnotationUsage = true;
break;
default:
throw new IllegalStateException("NYI: Unsupported annotation value binding for " + o);
}
}
if (foundValueInAnnotationUsage) {
break;
}
}
// this block deals with default values
if (!foundValueInAnnotationUsage) {
for (ResolvedMember annotationField : annotationFields) {
if (countOfType > 1) {
if (!annotationField.getName().equals(name)) {
continue;
}
}
if (!annotationField.getType().getSignature().equals(annoFieldOfInterest.getSignature())) {
continue;
}
if (annotationField.getType().getSignature().equals("I")) {
int ivalue = Integer.parseInt(annotationField.getAnnotationDefaultValue());
il.append(fact.createConstant(ivalue));
foundValueInAnnotationUsage = true;
break;
} else if (annotationField.getType().getSignature().equals("Ljava/lang/String;")) {
String svalue = annotationField.getAnnotationDefaultValue();
il.append(fact.createConstant(svalue));
foundValueInAnnotationUsage = true;
break;
} else {
String dvalue = annotationField.getAnnotationDefaultValue();
// form will be LBLAHBLAHBLAH;X where X is the field within X
String typename = dvalue.substring(0, dvalue.lastIndexOf(';') + 1);
String field = dvalue.substring(dvalue.lastIndexOf(';') + 1);
ResolvedType rt = toType.getWorld().resolve(UnresolvedType.forSignature(typename));
il.append(fact.createGetStatic(rt.getName(), field, Type.getType(rt.getSignature())));
foundValueInAnnotationUsage = true;
break;
}
}
}
}
if (foundValueInAnnotationUsage) {
break;
}
}
}
@Override
public void insertLoad(InstructionList il, InstructionFactory fact) {
// Only possible to do annotation field value extraction at
// MethodExecution
if (annoAccessor.getKind() != Shadow.MethodExecution) {
return;
}
appendLoadAndConvert(il, fact, annoFieldOfInterest);
}
@Override
public String toString() {
return super.toString();
}
}