Class with long name

Question

Name of Exception class in Java must have Exception suffix also describe its throwing situation. Now I have two exception classes in about primary external storage in Android:

/**
 * Thrown when Application tries to access primary external storage and it is not
 * available for write.This only depends on status of storage, for example media
 * not mounted,bad mounted, or ... .
 */
public class PrimaryExternalStorageIsNotReadyToWriteException extends Exception {
...
}

/**
 * Thrown when Application tries to write on a directory
 * of primary external storage that needs
 * {@link Manifest.permission#WRITE_EXTERNAL_STORAGE} permission but that
 * permission has not granted to the Application.
 */
public class WriteToPrimaryExternalStoragePermisionException extends RuntimeException {
...
}

As you see, names are long, but I can not remove Exception or PrimaryExternalStorage from names. Also I do not want to use SecurityException or other existing exceptions because those are general. I know long names are not forbidden but using and reminding them is hard. The only thing I can think is creating a package with name primaryexternalstorageexceptions and change names to IsNotReadyToWriteException and WritePermisionException. But is it a good way? And is there a better way to avoid those long names?

Answer 1

If you are using PrimaryExternalStorage pretty often in your program, it seems ok to introduce (and document) an abbreviation like PES and use PESIsNotReadyToWriteException, WriteToPESPermissionException (or PesIsNotReadyToWriteException, WriteToPesPermissionException depending on your policy of using abbreviations in camelCased identifiers).

Note that Is in your first exception is definitely redundant. See, for example, JDK exceptions like ArrayIndexOutOfBoundsException is not ArrayIndexIsOutOfBoundsException.

Another thing which comes in mind is to make your exceptions somewhat more general like PrimaryExternalStorageNotReadyException (not ready for anything, not just write) and PrimaryExternalStoragePermissionException (actual missing permission were it write or read may be passed as exception parameter).

Answer 2

Creating a separate package primaryexternalstorageexceptions for a single exception class is killing the concept of Packages in java. If you feel that there would be more than 5 or 6 Exception class that would be part of primaryexternalstorageexceptions, then you can got for it. I personally do not think to have a separate package.

I would suggest you to shorten the class name likewise: PrimaryExternalStorageIsNotReadyToWriteException to PrmyExtlStrgIsNotReadyToWriteException

The standard is to what you have now, which is a long class name. Anyhow, the Exceptions are packaged and it will not be hard for you to go to a package and search for the class.