@SuppressWarnings("unused")
private Object createFactory(Class<?> cls, Constructor<?> contructor) {
String newClassName = cls.getName() + "Factory";
ASMHelper helper = new ASMHelper();
ClassWriter cw = helper.createClassWriter();
MethodVisitor mv;
cw.visit(
Opcodes.V1_6,
Opcodes.ACC_PUBLIC + Opcodes.ACC_SUPER,
ASMHelper.periodToSlashes(newClassName),
null,
"java/lang/Object",
null);
cw.visitSource(cls.getSimpleName() + "Factory" + ".java", null);
mv = cw.visitMethod(Opcodes.ACC_PUBLIC, "<init>", "()V", null, null);
mv.visitCode();
mv.visitVarInsn(Opcodes.ALOAD, 0);
mv.visitMethodInsn(Opcodes.INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
mv.visitInsn(Opcodes.RETURN);
mv.visitMaxs(1, 1);
mv.visitEnd();
mv =
cw.visitMethod(
Opcodes.ACC_PUBLIC,
"create" + cls.getSimpleName(),
"()L" + ASMHelper.periodToSlashes(cls.getName()) + ";",
null,
null);
mv.visitCode();
String name = cls.getName().replace(".", "/");
mv.visitTypeInsn(Opcodes.NEW, name);
mv.visitInsn(Opcodes.DUP);
StringBuilder paraString = new StringBuilder("(");
for (Class<?> paraClass : contructor.getParameterTypes()) {
mv.visitInsn(Opcodes.ACONST_NULL);
paraString.append("Ljava/lang/Object;");
}
paraString.append(")V");
mv.visitMethodInsn(Opcodes.INVOKESPECIAL, name, "<init>", paraString.toString(), false);
mv.visitInsn(Opcodes.ARETURN);
mv.visitMaxs(1, 1);
mv.visitEnd();
cw.visitEnd();
Class<?> factoryClass = helper.loadClass(newClassName, cls, cw.toByteArray());
try {
return factoryClass.newInstance();
} catch (Exception e) {
// ignore
}
return null;
}
