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Validating the password is a bit trickier because it involves looking at two fields at once and making sure they match. You could do this by defining a method for one of the fields and having it look at the other, like so: def clean_password2(self): if self.cleaned_data['password1'] != self.cleaned_data['password2']: raise forms.ValidationError("You must type the same password each time") return self.cleaned_data['password2'] But there s a better way to do this. Django lets you define a validation method simply called clean() which applies to the form as a whole. Here s how you could write it: def clean(self): if 'password1' in self.cleaned_data and 'password2' in self.cleaned_data: if self.cleaned_data['password1'] != self.cleaned_data['password2']: raise forms.ValidationError("You must type the same password each time") return self.cleaned_data Note that in this case you manually check that there are values in cleaned_data for the two password fields. If there were any errors raised during individual field validation, cleaned_ data will be empty. So you need to check this before referring to anything you expect to find in it.

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Unlike Unix applications, some Java applications can exist without touching the disk at all. On the other hand, the NetBeans Platform, and especially its configuration, is built around files. However, it doesn t deal directly with files on disk. Instead, it s based on the concept of virtual files. The configuration area of any NetBeans Platform based application is similar to the content of Unix s /etc directory. Every utility (in Unix) or a module (in the case of the NetBeans Platform) has one or more dedicated locations that it reads to acquire configuration parameters. For example, the system that builds the NetBeans Platform s menu and toolbar as shown in Figure 3-1 reads its data from the /Menu or /Toolbars directories. In fact, locations of this kind form an important API, because other modules need to know them to register their own configuration files there. Their names cannot change arbitrarily, as that would mean that currently existing registrations would no longer be recognized. Their content needs to be stable as well, for the same reason.

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Figure 3-1. The NetBeans menu and toolbar are built from the content of file directories. This is comparable to Unix s /etc configuration area. However, there is one significant difference. Most of the files in the NetBeans configuration directory are just virtual; that is, they are taken from many XML filesystems. Just like a giant sandwich, the configuration is composed from various layers. Each component (a NetBeans module) is capable of providing an XML filesystem layer with many file registrations, such as this one: <filesystem> <folder name="Menu"> <file name="Open.instance"/> </folder> </filesystem> The system then merges all these layers together into one filesystem. This works similarly to unionfs in modern Linux distributions. This big, merged filesystem is then used to provide the actual configuration data for a running NetBeans system. All this feels like a big sandwich composed of individual component layers. I am fairly proud of this invention of mine, which I created in 2000, because it eliminates many small configuration files on disk, replacing them with virtual files read directly from each module. Moreover, it provides a significant advantage: the provided files are always consistent with the list of installed modules, which might not be true if they are copied to disk when a component is installed and removed when it s uninstalled.

Because the meaning of the second value can vary based on the first value, the easiest way to approach it is so create a big look-up table that maps all 16 possible values of the first four bits (the first character in the response) to its specific meaning. These are given in Table 15-11. Table 15-11. DTC location and definitions combined

All of the field types built in to Django's form system are required by default and so cannot be left blank. If either of the password fields was left blank, a ValidationError would be raised before the clean() method is called, and so you don't need to raise an additional error to require a value. To mark a form field as optional, pass it the keyword argument required=False.

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