/** Obtain a (cached) ClassReader for the given class. */
private ClassReader getClassReader(Class clazz) throws IOException {
ClassReader classReader = (ClassReader) this.classReaderCache.get(clazz);
if (classReader != null) return classReader;
synchronized (this.classReaderCache) {
classReader = (ClassReader) this.classReaderCache.get(clazz);
if (classReader != null) return classReader;
InputStream is = clazz.getResourceAsStream(ClassUtils.getClassFileName(clazz));
if (is == null) {
throw new FileNotFoundException("Class file for class [" + clazz.getName() + "] not found");
}
try {
classReader = new ClassReader(is);
this.classReaderCache.put(clazz, classReader);
} finally {
is.close();
}
return classReader;
}
}
