This commit is a step toward getting OpenDS internationalized. There are still issues to be resolved before we can declare that we are internationalized but this commit covers the bulk of changes needed at this time.

In general this commit converts any string values that might potentially be shown to an end user (client or administrator) to a new class called Message.  This includes exception messages, error log messages, alert and email text, labels, and CLI output.  Message's main interface includes methods for rendering itself as a string in the default locale using toString() or a specified locale toString(Locale).  In addition to addressing localization, this would allow us to potentially support controls allowing clients to set a preferred locale for server communication or output log messages in different languages.  Message extends CharSequence so it can be used in some places where strings are currently used with not code change (e.g. writing to a buffer) as well as allowing messages to be composed of one another.

In order to create localized messages, instead of adding them to the *Messages.java class, you define them in the corresponding properties files.  In general the property file keys are used to derive the new messages severity, category, and ordinal.  There are directives that can be used in the properties file in order to avoid doing this however.  For instance all the properties files used internally include the 'global.category' directive at the top of the file that instructs the generator to make all the following message belong to a single category.  So for internal messages the property value key will be as follows:

   [SEVERITY]_[DESCRIPTION]_[ORDINAL]

See the properties files themselves for more information.

Once your messages are in the properties file you can use the ant target 'generatemessages' to create create MessageDescriptor objects that are referred to in the Java code.  In the code you might think of these objects as replacing the int-valued message IDs.  To create messages you call MessageDescriptor.get() which replaces MessageHandler.getMessage().  It might be helpful then to try to define your messages before referring to them in your code since until you run 'generatemessages' you won't have any Java-code with with to create your message objects.

In order to support non-localizable text in messages (host names, DN's, etc.) Message's can be created from String values by calling Message.raw(String).  In this way it is also possible to circumvent the intention of changing the APIs to use Message objects instead of Strings which is to support writing of localizable messages.  This method is currently used in the code as a crutch for areas of the code that need internationalization (tagged with a 'TODO: i18n' comment).  It might also be used by 3rd party developers that don't intend to localize their products.  However for internal use we should not be using this method to create Messages for text that is locale sensitive.

Additionally this code includes a MessageBuilder that can be used in much the same way that a StringBuilder can be used.  It has a method toMessage() that can be used to generate a message object when needed.  At this time this method just converts the buffer contents to a raw, unlocalizable message so this will need to addressed in the future.

Some other issues:

- While all of the unit tests pass after this commit, there may be issues in the code where we have no or minimal test coverage.  This includes much of the setup and GUI tools packages for which I have not done any testing but will begin after this commit.

- The new message related Java sources are contained in package org.opends.messages and organized in a new module src/module modeled somewhat after the admin module:

    src/messages/src (non-generated Java source files)
    src/messages/generated (generated source files)
    src/messages/messages (properties files for messages)

If you run the code from within your IDE you will have to mark all messages/src, messages/generated and messages as source directories.

- To generated the MessageDescriptor files you invoke the 'generatemessages' target.

- If you run the code from within your IDE you will probably ne

- This commit would change the plugin API.  Here are the changes caught by DirectoryServerPluginTestCase:

    doShutdown(String)->doShutdown(Message)

    doPostDisconnect(PostDisconnectPluginResult,ClientConnection,DisconnectReason,int,String) ->         doPostDisconnect(PostDisconnectPluginResult,ClientConnection,DisconnectReason,Message);

- This commit aligns the entire code-base behind the new Formatter class (printf style formattings like %s) as opposed to the older MessageFormat style (using curly braces for message arguments).  This allows us to provide more type safety for message arguments.  So for instance you can include a %c argument specifier in your format string and the MessageDescriptor will enforce specification of a Character as message creation time.

- Not all of the config framework has not been converted to use Messages.  Perhaps as some point we might have a 'message' syntax for locale-sensitive textural data.  I'm sure Matt will have ideas about this.

- In addition to Message, MessageDescriptor and MessageBuilder, the org.opends.server.message package includes enums for Category and Severity that replace the definitions formerly found in MessageHandler.

- The interface for the ErrorLogger has been simplified to allow logging of messages using a single Message parameter.  The severity and category of the message will be derived from the Message itself instead of specified as arguments when a message is logged.

- I will provide more documentation about this plumbing on the Wiki shortly.

- I will expand on the included tests soon.