™.. Data::Grove::Parent - Online Linux Manual PageSection : 3
Updated : 2003-10-21
Source : perl v5.10.1
Note : User Contributed Perl Documentation
NAMEData::Grove::Parent − provide parent properties to Data::Grove objects
SYNOPSIS​ use Data::Grove::Parent; ​ ​ $root = $object−>root; ​ $rootpath = $object−>rootpath; ​ $tied = $object−>add_magic([ $parent ]); ​ ​ $node = Data::Grove::Parent−>new($hash [, $parent]); ​ $node_list = Data::Grove::ParentList−>new($array [, $parent]);
DESCRIPTIONData::Grove::Parent is an extension to Data::Grove that adds `\*(C`Parent\*(C'\fR' and `\f(CW\*(C`Raw\*(C'\fR' properties to Data::Grove objects and methods for returning the root node of a grove, a list of nodes between and including the root node and the current node, and a method that creates parented nodes. Data::Grove::Parent works by creating a Perl ``tied'' object that contains a parent reference (`\*(C`Parent\*(C'\fR') and a reference to the original Data::Grove object (`\*(C`Raw\*(C'\fR'). Tying-magic is used so that every time you reference the Data::Grove::Parent object it actually references the underlying raw object. When you retrieve a list or a property of the Raw object, Data::Grove::Parent automatically adds magic to the returned list or node. This means you only call `add_magic()' once to create the first Data::Grove::Parent object and then use the grove objects like you normally would. The most obvious use of this is so you don't have to call a `\*(C`delete\*(C'\fR' method when you want to release a grove or part of a grove; since Data::Grove and Data::Grove::Parent objects have no cyclic references, Perl can garbage collect them normally. A secondary use is to allow you to reuse grove or property set fragments in multiple trees. WARNING: Data::Grove currently does not protect you from creating your own cyclic references! This could lead to infinite loops if you don't take care to avoid them.
METHODS$object−>root() $object−>rootpath() `\*(C`root()\*(C'\fR' returns the root node if `\f(CW$object\fR' is a `\*(C`Data::Grove::Parent\*(C'\fR' object. `\f(CW\*(C`rootpath()\*(C'\fR' returns an array of all the nodes between and including the root node and `$object'. $tied = $object−>add_magic([ $parent ]) `\*(C`add_magic()\*(C'\fR' returns a \f(CW\*(C`Data::Grove::Parent\*(C'\fR object with `$object' as it's `\*(C`Raw\*(C'\fR' object. If `\f(CW$parent\fR' is given, that becomes the tied object's parent object.
AUTHORKen MacLeod, ken@bitsko.slc.ut.us
SEE ALSO​perl (1), Data::Grove (3) 0
Johanes Gumabo
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