Fatal division by zero attempted Post: 303040604

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data::grove

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

NAME

       Data::Grove -- support for deeply nested structures

SYNOPSIS

	use Data::Grove;

	$object = MyPackage->new;

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

DESCRIPTION

       "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 data-
       base.

       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-struc-
       tures can be shared among several structures.  "Data::Grove::Parent" is used to create temporary objects with parent pointers.

       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 "Data::Grove".

METHODS

       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.

AUTHOR

       Ken MacLeod, ken@bitsko.slc.ut.us

SEE ALSO

       perl(1)

perl v5.8.0							    2000-02-22							    Data::Grove(3)