XACML Policy Provider that resolves Policy(Set)IdReferences. There must be one and only one Java class on the classpath - say com.example.FooPolicyProviderFactory - implementing interface org.ow2.authzforce.core.pdp.api.policy.CLoseablePolicyProvider.Factory<CONF_T> with zero-arg constructor, where CONF_T is the JAXB type bound to this XML element type.

More info about Policy Providers (how to make/use one) is available on AuthzForce wiki.

Implementation classes can use org.ow2.authzforce.pd.api.EnvironmentProperties#replacePlaceholders() method to replace ${property_name} placeholders with such properties. You may use ! (exclamation mark) as a separating character between the placeholder property name and a default value that is used if the property is undefined. E.g. ${PARENT_DIR!/home/foo/conf} will be replaced with /home/foo/conf if PARENT_DIR is undefined. In the location, you may use placeholders enclosed between ${ and } for the following properties:

• the global property PARENT_DIR for defining - in a generic way - a path relative to the parent directory to the XML file where this is used;
• Java system properties;
• System environment variables.