Class MessagesSourceImpl

java.lang.Object
org.apache.tapestry5.internal.event.InvalidationEventHubImpl
org.apache.tapestry5.internal.services.MessagesSourceImpl
All Implemented Interfaces:
InvalidationEventHub, MessagesSource, UpdateListener

A utility class that encapsulates all the logic for reading properties files and assembling Messages from them, in accordance with extension rules and locale. This represents code that was refactored out of ComponentMessagesSourceImpl. This class can be used as a base class, though the existing code base uses it as a utility. Composition trumps inheritance! The message catalog for a component is the combination of all appropriate properties files for the component, plus any keys inherited form base components and, ultimately, the application global message catalog. At some point we should add support for per-library message catalogs. Message catalogs are read using the UTF-8 character set. This is tricky in JDK 1.5; we read the file into memory then feed that bytestream to Properties.load().
  • Constructor Details

  • Method Details

    • checkForUpdates

      public void checkForUpdates()
      Description copied from interface: UpdateListener
      Invoked to force the receiver to check for updates to whatever underlying resources it makes use of.
      Specified by:
      checkForUpdates in interface UpdateListener
    • invalidate

      public void invalidate()
    • getMessages

      Description copied from interface: MessagesSource
      Used to obtain a Messages instance for a particular component, within a particular locale. If the component extends from another component, then its localized properties will merge with its parent's properties (with the subclass overriding the super class on any conflicts).
      Specified by:
      getMessages in interface MessagesSource
      Parameters:
      bundle - defines the set of properties files to read, as well as a series of parent bundles to extend and override
      selector - defines the locale and other axes used to locate the necessary resources
      Returns:
      the message catalog for the bundle, for the indicated selector