org.apache.commons.configuration.tree

A package with helper and utility classes used by hierarchical configurations.

$Id: package.html 439648 2006-09-02 20:42:10Z oheger $

Definition of an interface for the nodes of a hierarchical configuration.

This interface defines a tree like structure for configuration data.

Definition of a Visitor interface for a configuration node structure.

The ConfigurationNode interface defines a visit(), which simplifies traversal of a complex node hierarchy.

A simple adapter class that simplyfies writing custom node visitor implementations.

This class provides dummy implementations for the methods defined in the ConfigurationNodeVisitor interface.

A simple class that supports creation of and iteration on configuration keys supported by a DefaultExpressionEngine object.

For key creation the class works similar to a StringBuffer: There are several appendXXXX() methods with which single parts of a key can be constructed.

A default implementation of the ConfigurationNode interface.

A default implementation of the ExpressionEngine interface providing the "native"e; expression language for hierarchical configurations.

This class implements a rather simple expression language for navigating through a hierarchy of configuration nodes.

Definition of an interface for evaluating keys for hierarchical configurations.

An expression engine knows how to map a key for a configuration's property to a single or a set of configuration nodes.

A simple data class used by ExpressionEngine to store the results of the prepareAdd() operation.

If a new property is to be added to a configuration, the affected Configuration object must know, where in its hierarchy of configuration nodes new elements have to be added.

A base class for node combiner implementations.

A node combiner is an object that knows how two hierarchical node structures can be combined into a single one.

A concrete combiner implementation that is able to construct an override combination.

An override combination means that nodes in the first node structure take precedence over nodes in the second, or - in other words - nodes of the second structure are only added to the resulting structure if they do not occure in the first one.

A specialized implementation of the NodeCombiner interface that constructs a union from two passed in node hierarchies.

The given source hierarchies are traversed and their nodes are added to the resulting structure.

A specialized node implementation to be used in view configurations.

Some configurations provide a logical view on the nodes of other configurations.