2.4. The Fqn Class

The previous section used the Fqn class in its examples; now let us learn a bit more about that class.

A Fully Qualified Name (Fqn) encapsulates a list of names which represent a path to a particular location in the cache's tree structure. The elements in the list are typically Strings but can be any Object or a mix of different types.

This path can be absolute (i.e., relative to the root node), or relative to any node in the cache. Reading the documentation on each API call that makes use of Fqn will tell you whether the API expects a relative or absolute Fqn.

The Fqn class provides are variety of factory methods; see the Javadoc for all the possibilities. The following illustrates the most commonly used approaches to creating an Fqn:

   // Create an Fqn pointing to node 'Joe' under parent node 'Smith'
   // under the 'people' section of the tree
	    
   // Parse it from a String
   Fqn abc = Fqn.fromString("/people/Smith/Joe/");
	    
   // Here we want to use types other than String
   Fqn acctFqn = Fqn.fromElements("accounts", "NY", new Integer(12345));

   // Create an Fqn pointing to node 'Joe' under parent node 'Smith'
   // under the 'people' section of the tree
	    
   // Parse it from a String
   Fqn abc = Fqn.fromString("/people/Smith/Joe/");
	    
   // Here we want to use types other than String
   Fqn acctFqn = Fqn.fromElements("accounts", "NY", new Integer(12345));

Copy to Clipboard

Toggle word wrap

Note that

Fqn f = Fqn.fromElements("a", "b", "c");

Fqn f = Fqn.fromElements("a", "b", "c");

Copy to Clipboard

Toggle word wrap

is the same as

Fqn f = Fqn.fromString("/a/b/c");

Fqn f = Fqn.fromString("/a/b/c");

Copy to Clipboard

Toggle word wrap

Este conteúdo não está disponível no idioma selecionado.

2.4. The Fqn Class

Aprender

Experimente, compre e venda

Comunidades

Sobre a documentação da Red Hat

Tornando o open source mais inclusivo

Sobre a Red Hat

Theme

Red Hat legal and privacy links

Red Hat legal and privacy links