1Data::Grove::Parent(3)User Contributed Perl DocumentationData::Grove::Parent(3)
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NAME

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

9        use Data::Grove::Parent;
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11        $root = $object->root;
12        $rootpath = $object->rootpath;
13        $tied = $object->add_magic([ $parent ]);
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15        $node = Data::Grove::Parent->new($hash [, $parent]);
16        $node_list = Data::Grove::ParentList->new($array [, $parent]);
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DESCRIPTION

19       Data::Grove::Parent is an extension to Data::Grove that adds `"Parent"'
20       and `"Raw"' properties to Data::Grove objects and methods for returning
21       the root node of a grove, a list of nodes between and including the
22       root node and the current node, and a method that creates parented
23       nodes.
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25       Data::Grove::Parent works by creating a Perl ``tied'' object that con‐
26       tains a parent reference (`"Parent"') and a reference to the original
27       Data::Grove object (`"Raw"').  Tying-magic is used so that every time
28       you reference the Data::Grove::Parent object it actually references the
29       underlying raw object.
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31       When you retrieve a list or a property of the Raw object,
32       Data::Grove::Parent automatically adds magic to the returned list or
33       node.  This means you only call `add_magic()' once to create the first
34       Data::Grove::Parent object and then use the grove objects like you nor‐
35       mally would.
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37       The most obvious use of this is so you don't have to call a `"delete"'
38       method when you want to release a grove or part of a grove; since
39       Data::Grove and Data::Grove::Parent objects have no cyclic references,
40       Perl can garbage collect them normally.
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42       A secondary use is to allow you to reuse grove or property set frag‐
43       ments in multiple trees.  WARNING: Data::Grove currently does not pro‐
44       tect you from creating your own cyclic references!  This could lead to
45       infinite loops if you don't take care to avoid them.
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METHODS

48       $object->root()
49       $object->rootpath()
50           `"root()"' returns the root node if `$object' is a
51           `"Data::Grove::Parent"' object.  `"rootpath()"' returns an array of
52           all the nodes between and including the root node and `$object'.
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54       $tied = $object->add_magic([ $parent ])
55           `"add_magic()"' returns a "Data::Grove::Parent" object with
56           `$object' as it's `"Raw"' object.  If `$parent' is given, that
57           becomes the tied object's parent object.
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AUTHOR

60       Ken MacLeod, ken@bitsko.slc.ut.us
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SEE ALSO

63       perl(1), Data::Grove(3)
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67perl v5.8.8                       2003-10-21            Data::Grove::Parent(3)
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