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Manual Reference Pages  -  DATA::GROVE::PARENT (3)

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NAME

Data::Grove::Parent - provide parent properties to Data::Grove objects

CONTENTS

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]);



DESCRIPTION

Data::Grove::Parent is an extension to Data::Grove that adds ‘Parent’ and ‘Raw’ 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 (‘Parent’) and a reference to the original Data::Grove object (‘Raw’). 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 ‘delete’ 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 <B>ownB> cyclic references! This could lead to infinite loops if you don’t take care to avoid them.

METHODS

$object->root()
$object->rootpath() root()’ returns the root node if$object’ is a ‘Data::Grove::Parent’ object. ‘rootpath()’ returns an array of all the nodes between and including the root node and ‘$object’.
$tied = $object->add_magic([ $parent ]) add_magic()’ returns a Data::Grove::Parent object with ‘$object’ as it’s ‘Raw’ object. If ‘$parent’ is given, that becomes the tied object’s parent object.

AUTHOR

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

SEE ALSO

perl(1), Data::Grove(3)
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perl v5.20.3 DATA::GROVE::PARENT (3) 2003-10-21

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