public byte[] transform(
ClassLoader loader,
String className,
Class<?> classBeingRedefined,
ProtectionDomain protectionDomain,
byte[] classfileBuffer)
throws IllegalClassFormatException {
if (infos.isEmpty()) {
return null;
}
String convertedClassName = className.replace('/', '.');
SingleTableInheritanceInfo key = new SingleTableInheritanceInfo();
key.setClassName(convertedClassName);
int pos = infos.indexOf(key);
if (pos >= 0) {
try {
if (LOG.isDebugEnabled()) {
LOG.debug("Converting " + convertedClassName + " to a SingleTable inheritance strategy.");
}
SingleTableInheritanceInfo myInfo = infos.get(pos);
ClassFile classFile =
new ClassFile(new DataInputStream(new ByteArrayInputStream(classfileBuffer)));
ConstPool constantPool = classFile.getConstPool();
AnnotationsAttribute annotationsAttribute =
new AnnotationsAttribute(constantPool, AnnotationsAttribute.visibleTag);
List<?> attributes = classFile.getAttributes();
Iterator<?> itr = attributes.iterator();
while (itr.hasNext()) {
Object object = itr.next();
if (AnnotationsAttribute.class.isAssignableFrom(object.getClass())) {
AnnotationsAttribute attr = (AnnotationsAttribute) object;
Annotation[] items = attr.getAnnotations();
for (Annotation annotation : items) {
String typeName = annotation.getTypeName();
if (!typeName.equals(Inheritance.class.getName())
&& ((myInfo.getDiscriminatorName() == null
&& !typeName.equals(Table.class.getName()))
|| myInfo.getDiscriminatorName() != null)) {
annotationsAttribute.addAnnotation(annotation);
}
}
itr.remove();
}
}
Annotation inheritance = new Annotation(Inheritance.class.getName(), constantPool);
ClassPool pool = ClassPool.getDefault();
pool.importPackage("javax.persistence");
pool.importPackage("java.lang");
EnumMemberValue strategy =
(EnumMemberValue)
Annotation.createMemberValue(constantPool, pool.makeClass("InheritanceType"));
strategy.setType(InheritanceType.class.getName());
strategy.setValue(InheritanceType.SINGLE_TABLE.name());
inheritance.addMemberValue("strategy", strategy);
annotationsAttribute.addAnnotation(inheritance);
if (myInfo.getDiscriminatorName() != null) {
Annotation discriminator =
new Annotation(DiscriminatorColumn.class.getName(), constantPool);
StringMemberValue name = new StringMemberValue(constantPool);
name.setValue(myInfo.getDiscriminatorName());
discriminator.addMemberValue("name", name);
EnumMemberValue discriminatorType =
(EnumMemberValue)
Annotation.createMemberValue(constantPool, pool.makeClass("DiscriminatorType"));
discriminatorType.setType(DiscriminatorType.class.getName());
discriminatorType.setValue(myInfo.getDiscriminatorType().name());
discriminator.addMemberValue("discriminatorType", discriminatorType);
IntegerMemberValue length = new IntegerMemberValue(constantPool);
length.setValue(myInfo.getDiscriminatorLength());
discriminator.addMemberValue("length", length);
annotationsAttribute.addAnnotation(discriminator);
}
classFile.addAttribute(annotationsAttribute);
ByteArrayOutputStream bos = new ByteArrayOutputStream();
DataOutputStream os = new DataOutputStream(bos);
classFile.write(os);
os.close();
return bos.toByteArray();
} catch (Exception ex) {
ex.printStackTrace();
throw new IllegalClassFormatException(
"Unable to convert "
+ convertedClassName
+ " to a SingleTable inheritance strategy: "
+ ex.getMessage());
}
} else {
return null;
}
}
/** {@inheritDoc} */
@Override
protected void generate() {
this.inheritance =
InheritanceType.valueOf(
this.getAttribute(ElementConstants.ATTR_STRATEGY, InheritanceType.SINGLE_TABLE.name()));
}