Many projects read XML configuration files to provide
initialization of various Java objects within the system.
There are several ways of doing this, and the Digester
component was designed to provide a common implementation
that can be used in many different projects.
Basically, the Digester package lets you configure an
XML -> Java object mapping module, which triggers certain
actions called rules whenever a particular pattern of nested
XML elements is recognized. A rich set of predefined rules
is available for your use, or you can also create your own.
Advanced features of Digester include:
- Ability to plug in your own pattern matching engine, if
the standard one is not sufficient for your requirements.
- Optional namespace-aware processing, so that you can
define rules that are relevant only to a particular XML
- Encapsulation of Rules into RuleSets that can be easily
and conveniently reused in more than one application that
requires the same type of processing.