Class ResourceInternationalString

All Implemented Interfaces:
Serializable, Char­Sequence, Comparable<International­String>, Formattable, International­String

public class ResourceInternationalString extends AbstractInternationalString implements Serializable
An international string backed by a Resource­Bundle. Resource bundles can be Java classes or properties files, one for each language. The fully qualified class name of the base resource bundle (without locale suffix) is specified at construction time. The appropriate resource bundle is loaded at runtime for the client's language by looking for a class or a properties file with the right suffix, for example "_en" for English or "_fr" for French. See the Resource­Bundle​.get­Bundle(…) Javadoc for more information.
Example: if a file named "My­Resources​.properties" exists in org​.mypackage and contains the following line:
MyKey = some value
Then an international string for "some value" can be created using the following code:
InternationalString value = new ResourceInternationalString("org.mypackage.MyResources", "MyKey");
The "some value" string will be localized if the required properties files exist, for example "My­Resources_fr​.properties" for French or "My­Resources_it​.properties" for Italian, etc. If needed, users can gain more control by overriding the get­Bundle(Locale) method.

Class loaders

Developers can specify explicitly the Class­Loader to use be overriding the get­Bundle(Locale) method. This is recommended if the running environment loads modules in isolated class loaders, as OSGi does for instance.
API note: We do not provide Class­Loader argument in the constructor of this class because class loaders can often be hard-coded (thus avoiding the cost of an extra field) and are usually not serializable.

Apache SIS resources

Apache SIS has its own resources mechanism, built on top of the standard Resource­Bundle with the addition of type safety and optional arguments to be formatted in the localized string. Those resource bundles provide format­International(int, …) static methods for creating international strings with the same functionality than this Resource­International­String. See org​.apache​.sis​.util​.resources for more information.

Immutability and thread safety

This class is immutable and thus inherently thread-safe if the bundles created by get­Bundle(Locale) is also immutable. Subclasses may or may not be immutable, at implementation choice. But implementers are encouraged to make sure that subclasses remain immutable for more predictable behavior.
See Also:

Defined in the sis-utility module

  • Field Details

    • resources

      protected final String resources
      The name of the resource bundle, as a fully qualified class name. This value is given at construction time and can not be null.
    • key

      protected final String key
      The key for the resource to fetch. This value is given at construction time and can not be null.
  • Constructor Details

    • ResourceInternationalString

      public ResourceInternationalString(String resources, String key)
      Creates a new international string from the specified resource bundle and key. The class loader will be the one of the to­String(Locale) caller, unless the get­Bundle(Locale) method is overridden.
      resources - the name of the resource bundle, as a fully qualified class name.
      key - the key for the resource to fetch.
  • Method Details

    • getBundle

      protected ResourceBundle getBundle(Locale locale) throws MissingResourceException
      Returns the resource bundle for the given locale. The default implementation fetches the bundle from the name given at construction time. Subclasses can override this method if they need to fetch the bundle in an other way.

      Class loaders

      By default, this method loads the resources using the caller's class loader. Subclasses can override this method in order to specify a different class loader. For example, the code below works well if My­Resource is a class defined in the same module than the one that contain the resources to load:
      protected ResourceBundle getBundle(final Locale locale) {
          return ResourceBundle.getBundle(resources, locale, MyResource.class.getClassLoader());
      locale - the locale for which to get the resource bundle.
      the resource bundle for the given locale.
      Missing­Resource­Exception - if no resource bundle can be found for the base name specified at construction time.
      See Also:
    • toString

      public String toString(Locale locale) throws MissingResourceException
      Returns a string in the specified locale. If there is no string for the specified locale, then this method searches for a string in an other locale as specified in the Resource­Bundle class description.

      Handling of null argument value

      In the default implementation, the null locale is handled as a synonymous of Locale​.ROOT. However subclasses are free to use a different fallback. Client code are encouraged to specify only non-null values for more determinist behavior.
      Specified by:
      to­String in interface International­String
      Specified by:
      to­String in class Abstract­International­String
      locale - the desired locale for the string to be returned.
      the string in the specified locale, or in a fallback locale.
      Missing­Resource­Exception - if no resource can be found for the base name or for the key specified at construction time.
      See Also:
    • equals

      public boolean equals(Object object)
      Compares this international string with the specified object for equality.
      equals in class Object
      object - the object to compare with this international string.
      true if the given object is equal to this string.
    • hashCode

      public int hashCode()
      Returns a hash code value for this international text.
      hash­Code in class Object
      a hash code value for this international text.