KickMeToAndy
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Posted: March 05, 2011 14:29 by KickMeToAndy
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Hi, i was wondering how the LocalStorage serialization does handle transient fields. In my application i have a preference dialog where you can enter a password, which should not be stored in the configuration file. that is why i marked the field in the Preferences bean as transient. However, when using the LocalStorage to save my preferences the password is serialized even though it is transient. Is this a bug or do i have to reset all transient fields myself before saving the configuration? thanks in advance, cheers, Andy |
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LocalStorage serialization question
4 posts
Replies: 3 - Last Post: March 09, 2011 18:41
by: etf
by: etf
showing 1 - 4 of 4
etf
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Posted: March 07, 2011 21:32 by etf
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Hello Andy, Thanks for you interest in the project. The situation you have described in your message is not a bug of the BSAF. The key word "transient" works for java serialization. BSAF doesn't use this facility. XMLEncoder/XMLDecoder are used instead. This technology support transient properties also but in slightly different way. To make a long story short you need to use BeanInfo. Here is a brief example:
BeanInfo info = Introspector.getBeanInfo(JTextField.class);
PropertyDescriptor[] propertyDescriptors =
info.getPropertyDescriptors();
for (int i = 0; i < propertyDescriptors.length; ++i) {
PropertyDescriptor pd = propertyDescriptors[i];
if (pd.getName().equals("text")) {
pd.setValue("transient", Boolean.TRUE);
}
}
To make a transient property in a custom bean you have to create a ...BeanInfo class with following string in it:
properties[PROPERTY_PASSWORD].setValue("transient", Boolean.TRUE);
where PROPERTY_PASSWORD is index of a transient property. I hope this helps. |
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KickMeToAndy
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Posted: March 09, 2011 17:42 by KickMeToAndy
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Thanks for your reply, i finally fixed the problem with a custom Annotation and code derived from your posting. Here is the code if somebody is interested in it. It'd be nice if something like that could be added to the framework, since the bsaf intends to reduce the amount of code you have to write for you application. quite a lot of code to reset the password attribute before saving the bean in the local storage 
public class BeanInfoUtil {
public static void markTransientAttributes(Class<?>... classes) {
for (final Class<?> tmpClazz : classes) {
try {
final BeanInfo info = Introspector.getBeanInfo(tmpClazz);
final PropertyDescriptor[] propertyDescriptors = info.getPropertyDescriptors();
for (int i = 0; i < propertyDescriptors.length; ++i) {
final PropertyDescriptor pd = propertyDescriptors[i];
if (pd.getReadMethod().isAnnotationPresent(Transient.class)) {
pd.setValue("transient", Boolean.TRUE);
}
}
} catch (IntrospectionException e) {
}
}
}
}
cheers, Andy |
Replies: 3 - Last Post: March 09, 2011 18:41
by: etf
by: etf
