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The AspectJ weaver introduces advices to java classes
/* *******************************************************************
* 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 v1.0
* which accompanies this distribution and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* PARC initial implementation
* ******************************************************************/
package org.aspectj.weaver.bcel;
import java.util.List;
import org.aspectj.apache.bcel.classfile.Attribute;
import org.aspectj.apache.bcel.classfile.ConstantPool;
import org.aspectj.apache.bcel.classfile.Field;
import org.aspectj.apache.bcel.classfile.Synthetic;
import org.aspectj.apache.bcel.classfile.annotation.AnnotationGen;
import org.aspectj.apache.bcel.generic.FieldGen;
import org.aspectj.util.GenericSignature;
import org.aspectj.util.GenericSignatureParser;
import org.aspectj.weaver.AjAttribute;
import org.aspectj.weaver.AjAttribute.WeaverVersionInfo;
import org.aspectj.weaver.AnnotationAJ;
import org.aspectj.weaver.ISourceContext;
import org.aspectj.weaver.ResolvedMemberImpl;
import org.aspectj.weaver.ResolvedType;
import org.aspectj.weaver.UnresolvedType;
import org.aspectj.weaver.World;
import org.aspectj.weaver.bcel.BcelGenericSignatureToTypeXConverter.GenericSignatureFormatException;
/**
* An AspectJ Field object that is backed by a Bcel Field object.
*
* @author PARC
* @author Andy Clement
*/
final class BcelField extends ResolvedMemberImpl {
public static int AccSynthetic = 0x1000;
private Field field;
private boolean isAjSynthetic;
private boolean isSynthetic = false;
private AnnotationAJ[] annotations;
private final World world;
private final BcelObjectType bcelObjectType;
private UnresolvedType genericFieldType = null;
private boolean unpackedGenericSignature = false;
private boolean annotationsOnFieldObjectAreOutOfDate = false;
BcelField(BcelObjectType declaringType, Field field) {
super(FIELD, declaringType.getResolvedTypeX(), field.getModifiers(), field.getName(), field.getSignature());
this.field = field;
this.world = declaringType.getResolvedTypeX().getWorld();
this.bcelObjectType = declaringType;
unpackAttributes(world);
checkedExceptions = UnresolvedType.NONE;
}
/**
* Constructs an instance that wrappers a Field object, but where we do not (yet) have a BcelObjectType - usually because the
* containing type (and this field) are being constructed at runtime (so there is no .class file to retrieve).
*/
BcelField(String declaringTypeName, Field field, World world) {
super(FIELD, UnresolvedType.forName(declaringTypeName), field.getModifiers(), field.getName(), field.getSignature());
this.field = field;
this.world = world;
this.bcelObjectType = null;
unpackAttributes(world);
checkedExceptions = UnresolvedType.NONE;
}
private void unpackAttributes(World world) {
Attribute[] attrs = field.getAttributes();
if (attrs != null && attrs.length > 0) {
ISourceContext sourceContext = getSourceContext(world);
List as = Utility.readAjAttributes(getDeclaringType().getClassName(), attrs, sourceContext, world,
(bcelObjectType != null ? bcelObjectType.getWeaverVersionAttribute() : WeaverVersionInfo.CURRENT),
new BcelConstantPoolReader(field.getConstantPool()));
as.addAll(AtAjAttributes.readAj5FieldAttributes(field, this, world.resolve(getDeclaringType()), sourceContext,
world.getMessageHandler()));
// FIXME this code has no effect!!!??? it is set to false immediately after the block
// for (AjAttribute a : as) {
// if (a instanceof AjAttribute.AjSynthetic) {
// isAjSynthetic = true;
// } else {
// throw new BCException("weird field attribute " + a);
// }
// }
}
isAjSynthetic = false;
for (int i = attrs.length - 1; i >= 0; i--) {
if (attrs[i] instanceof Synthetic) {
isSynthetic = true;
}
}
// in 1.5, synthetic is a modifier, not an attribute
if ((field.getModifiers() & AccSynthetic) != 0) {
isSynthetic = true;
}
}
@Override
public boolean isAjSynthetic() {
return isAjSynthetic;
}
@Override
public boolean isSynthetic() {
return isSynthetic;
}
@Override
public boolean hasAnnotation(UnresolvedType ofType) {
ensureAnnotationTypesRetrieved();
for (ResolvedType aType : annotationTypes) {
if (aType.equals(ofType)) {
return true;
}
}
return false;
}
@Override
public ResolvedType[] getAnnotationTypes() {
ensureAnnotationTypesRetrieved();
return annotationTypes;
}
@Override
public AnnotationAJ[] getAnnotations() {
ensureAnnotationTypesRetrieved();
return annotations;
}
@Override
public AnnotationAJ getAnnotationOfType(UnresolvedType ofType) {
ensureAnnotationTypesRetrieved();
for (AnnotationAJ annotation : annotations) {
if (annotation.getTypeName().equals(ofType.getName())) {
return annotation;
}
}
return null;
}
private void ensureAnnotationTypesRetrieved() {
if (annotationTypes == null) {
AnnotationGen annos[] = field.getAnnotations();
if (annos.length == 0) {
annotationTypes = ResolvedType.EMPTY_ARRAY;
annotations = AnnotationAJ.EMPTY_ARRAY;
} else {
int annosCount = annos.length;
annotationTypes = new ResolvedType[annosCount];
annotations = new AnnotationAJ[annosCount];
for (int i = 0; i < annosCount; i++) {
AnnotationGen anno = annos[i];
annotations[i] = new BcelAnnotation(anno, world);
annotationTypes[i] = annotations[i].getType();
}
}
}
}
@Override
public void addAnnotation(AnnotationAJ annotation) {
ensureAnnotationTypesRetrieved();
int len = annotations.length;
AnnotationAJ[] ret = new AnnotationAJ[len + 1];
System.arraycopy(annotations, 0, ret, 0, len);
ret[len] = annotation;
annotations = ret;
ResolvedType[] newAnnotationTypes = new ResolvedType[len + 1];
System.arraycopy(annotationTypes, 0, newAnnotationTypes, 0, len);
newAnnotationTypes[len] = annotation.getType();
annotationTypes = newAnnotationTypes;
annotationsOnFieldObjectAreOutOfDate = true;
}
public void removeAnnotation(AnnotationAJ annotation) {
ensureAnnotationTypesRetrieved();
int len = annotations.length;
AnnotationAJ[] ret = new AnnotationAJ[len - 1];
int p = 0;
for (AnnotationAJ anno : annotations) {
if (!anno.getType().equals(annotation.getType())) {
ret[p++] = anno;
}
}
annotations = ret;
ResolvedType[] newAnnotationTypes = new ResolvedType[len - 1];
p = 0;
for (ResolvedType anno : annotationTypes) {
if (!anno.equals(annotation.getType())) {
newAnnotationTypes[p++] = anno;
}
}
annotationTypes = newAnnotationTypes;
annotationsOnFieldObjectAreOutOfDate = true;
}
/**
* Unpack the generic signature attribute if there is one and we haven't already done so, then find the true field type of this
* field (eg. List).
*/
@Override
public UnresolvedType getGenericReturnType() {
unpackGenericSignature();
return genericFieldType;
}
public Field getFieldAsIs() {
return field;
}
public Field getField(ConstantPool cpool) {
if (!annotationsOnFieldObjectAreOutOfDate) {
return field;
}
FieldGen newFieldGen = new FieldGen(field, cpool);
newFieldGen.removeAnnotations();
// List alreadyHas = fg.getAnnotations();
// if (annotations != null) {
// fg.removeAnnotations();
for (AnnotationAJ annotation : annotations) {
newFieldGen.addAnnotation(new AnnotationGen(((BcelAnnotation) annotation).getBcelAnnotation(), cpool, true));
}
// for (int i = 0; i < annotations.length; i++) {
// AnnotationAJ array_element = annotations[i];
// boolean alreadyHasIt = false;
// for (AnnotationGen gen : alreadyHas) {
// if (gen.getTypeName().equals(array_element.getTypeName())) {
// alreadyHasIt = true;
// break;
// }
// }
// if (!alreadyHasIt) {
// fg.addAnnotation(new AnnotationGen(((BcelAnnotation) array_element).getBcelAnnotation(), cpg, true));
// // }
// // }
// }
field = newFieldGen.getField();
annotationsOnFieldObjectAreOutOfDate = false; // we are now correct again
return field;
}
private void unpackGenericSignature() {
if (unpackedGenericSignature) {
return;
}
if (!world.isInJava5Mode()) {
this.genericFieldType = getReturnType();
return;
}
unpackedGenericSignature = true;
String gSig = field.getGenericSignature();
if (gSig != null) {
// get from generic
GenericSignature.FieldTypeSignature fts = new GenericSignatureParser().parseAsFieldSignature(gSig);
GenericSignature.ClassSignature genericTypeSig = bcelObjectType.getGenericClassTypeSignature();
GenericSignature.FormalTypeParameter[] parentFormals = bcelObjectType.getAllFormals();
GenericSignature.FormalTypeParameter[] typeVars = ((genericTypeSig == null) ? new GenericSignature.FormalTypeParameter[0]
: genericTypeSig.formalTypeParameters);
GenericSignature.FormalTypeParameter[] formals = new GenericSignature.FormalTypeParameter[parentFormals.length
+ typeVars.length];
// put method formal in front of type formals for overriding in
// lookup
System.arraycopy(typeVars, 0, formals, 0, typeVars.length);
System.arraycopy(parentFormals, 0, formals, typeVars.length, parentFormals.length);
try {
genericFieldType = BcelGenericSignatureToTypeXConverter.fieldTypeSignature2TypeX(fts, formals, world);
} catch (GenericSignatureFormatException e) {
// development bug, fail fast with good info
throw new IllegalStateException("While determing the generic field type of " + this.toString()
+ " with generic signature " + gSig + " the following error was detected: " + e.getMessage());
}
} else {
genericFieldType = getReturnType();
}
}
@Override
public void evictWeavingState() {
if (field != null) {
unpackGenericSignature();
unpackAttributes(world);
ensureAnnotationTypesRetrieved();
// this.sourceContext = SourceContextImpl.UNKNOWN_SOURCE_CONTEXT;
field = null;
}
}
}