:jbake-type: page
:jbake-status: published

= Apache Tamaya - Extension: Features Check

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[[Features]]
== Tamaya Features Check (Extension Module)
Tamaya _Features_ is an extension module. Refer to the link:../extensions.html[extensions documentation] for further details.

=== What functionality this module provides ?

Tamaya _Features_ provides a simple +Features+ singleton that allows to check
which Tamaya Extensions are currently on the classpath.

=== Compatibility

The module is based on Java 7, so it will not run on Java 7 and beyond.


=== Installation

To use Tamaya _Features_ you only must add the corresponding dependency to
your module:

[source, xml, subs=attributes+]
-----------------------------------------------
<dependency>
  <groupId>org.apache.tamaya.ext</groupId>
  <artifactId>tamaya-features</artifactId>
  <version>{tamaya_version}</version>
</dependency>
-----------------------------------------------


=== The Functionality Provided

Main artifact is the +Features+ singleton, which provides various static methods
to check, which Tamaya extensions are currently loaded.

[source, java]
-----------------------------------------------
public final class Features {

    private Features(){}

    public static boolean eventsAvailable();
    public static boolean formatsAvailable();
    public static boolean tamayaCoreAvailable();
    public static boolean injectionAvailable();
    public static boolean injectionCDIAvailable();
    public static boolean mutableConfigAvailable();
    public static boolean optionalAvailable();
    public static boolean resolverAvailable();
    public static boolean resourcesAvailable();
    public static boolean spiSupportAvailable();
    public static boolean filterSupportAvailable();
    public static boolean springAvailable();
    public static boolean jndiAvailable();

    public static boolean extSpringCoreAvailable();
    public static boolean extJndiAvailable();
    public static boolean extOSGiAvailable();

    public static boolean checkClassIsLoadable(String classname);
}
-----------------------------------------------

* +eventsAvailable();+ checks for the link:mod_events.html[_tamaya_events_] module.
* +formatsAvailable();+ checks for the link:mod_formats.html[_tamaya_formats_] module.
* +tamayaCoreAvailable();+ checks if the link:core.html[_Tamaya core_] implementation is loaded.
* +injectionAvailable();+ checks for the link:mod_injection.html[_tamaya_injection_] SE module.
* +injectionCDIAvailable();+ checks for the link:mod_cdi.html[_tamaya CDI_] modules.
* +mutableConfigAvailable();+ checks for the link:mod_mutableconfig.html[_tamaya_mutableconfig_] module.
* +optionalAvailable();+ checks for the link:mod_optional.html[_tamaya_optional_] module.
* +resolverAvailable();+ checks for the link:mod_resolver.html[_tamaya_resolver_] module.
* +resourcesAvailable();+ checks for the link:mod_reources.html[_tamaya_resources_] module.
* +spiSupportAvailable();+ checks for the link:mod_spisupport.html[_tamaya_spisupport_] module.
* +filterSupportAvailable();+ checks for the link:mod_filter.html[_tamaya_filter_] module.
* +springAvailable();+ checks for the link:mod_spring.html[_tamaya_spring_] module.
* +jndiAvailable();+ checks for the link:mod_jndi.html[_tamaya_jndi_] module.
* +extJndiAvailable();+ checks if creation of a new `InitialContext` is successful.
* +extSpringCoreAvailable();+ checks if Spring Core is on the classpath.
* +extOSGiAvailable();+ checks the OSGi framework is on the classpath.
* Finally +checkClassIsLoaded(String)+ tries to load a class. If it fails, `false` is returned.