Data::Grove man page on Oracle

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Data::Grove(3)	      User Contributed Perl Documentation	Data::Grove(3)

       Data::Grove -- support for deeply nested structures

	use Data::Grove;

	$object = MyPackage->new;

	package MyPackage;
	@ISA = qw{Data::Grove};

       "Data::Grove" provides support for deeply nested tree or graph
       structures.  "Data::Grove" is intended primarily for Perl module
       authors writing modules with many types or classes of objects that need
       to be manipulated and extended in a consistent and flexible way.

       "Data::Grove" is best used by creating a core set of ``data'' classes
       and then incrementally adding functionality to the core data classes by
       using ``extension'' modules.  One reason for this design is so that the
       data classes can be swapped out and the extension modules can work with
       new data sources.  For example, these other data sources could be disk-
       based, network-based or built on top of a relational database.

       Two extension modules that come with "Data::Grove" are
       "Data::Grove::Parent" and "Data::Grove::Visitor".
       "Data::Grove::Parent" adds a `"Parent"' property to grove objects and
       implements a `"root"' method to grove objects to return the root node
       of the tree from anywhere in the tree and a `"rootpath"' method to
       return a list of nodes between the root node and ``this'' node.
       "Data::Grove::Visitor" adds callback methods `"accept"' and
       `"accept_name"' that call your handler or receiver module back by
       object type name or the object's name.

       "Data::Grove" objects do not contain parent references, Perl garbage
       collection will delete them when no longer referenced and sub-
       structures can be shared among several structures.
       "Data::Grove::Parent" is used to create temporary objects with parent

       Properties of data classes are accessed directly using Perl's hash
       functions (i.e. `"$object->{Property}"').  Extension modules may also
       define properties that they support or use, for example
       Data::Grove::Parent adds `"Parent"' and `"Raw"' properties and Visitor
       depends on `"Name"' and `"Content"' properties.

       See the module "XML::Grove" for an example implementation of

       new( PROPERTIES )
	   Return a new object blessed into the SubClass, with the given
	   properties.	PROPERTIES may either be a list of key/value pairs, a
	   single hash containing key/value pairs, or an existing
	   "Data::Grove" object.  If an existing "Data::Grove" is passed to
	   `"new()"', a shallow copy of that object will be returned.  A
	   shallow copy means that you are returned a new object, but all of
	   the objects underneath still refer to the original objects.

       Ken MacLeod,


perl v5.16.3			  2003-10-21			Data::Grove(3)

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