| 1 | package ClassifyTreeModel;
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| 2 |
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| 3 | use ClassifyTreeNode;
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| 4 | use strict;
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| 5 |
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| 6 |
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| 7 | # /** Constructor
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| 8 | # *
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| 9 | # * @param $class The name of the class to bless as a string
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| 10 | # * @param $collection The name of the collection whose GDBM database we
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| 11 | # * will be accessing as a string
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| 12 | # * @param $root The oid of the root node of the classifier as a
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| 13 | # * string
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| 14 | # * @return A reference to the ClassifyTreeModel object
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| 15 | # *
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| 16 | # * @author John Thompson, DL Consulting Ltd.
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| 17 | # */
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| 18 | sub new()
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| 19 | {
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| 20 | my ($class, $collection, $root) = @_;
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| 21 | my $debug = 0;
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| 22 | print STDERR "ClassifyTreeModel.new(\"$collection\", \"$root\")\n" unless !$debug;
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| 23 | # Store the variables
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| 24 | my $self = {};
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| 25 | $self->{'collection'} = $collection;
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| 26 | $self->{'debug'} = $debug;
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| 27 | $self->{'root'} = $root;
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| 28 | # Bless me father for I have sinned
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| 29 | bless $self, $class;
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| 30 | return $self;
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| 31 | }
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| 32 | # /** new() **/
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| 33 |
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| 34 | # /** Given a path and a document id, add this document to the classifier tree
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| 35 | # * creating any necessary tree nodes first.
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| 36 | # *
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| 37 | # * @param $value The path to store this document in
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| 38 | # * @param $oid Unique identifier of a document
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| 39 | # *
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| 40 | # * @author John Thompson, DL Consulting Ltd.
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| 41 | # */
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| 42 | sub addDocument()
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| 43 | {
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| 44 | my ($self, $value, $oid) = @_;
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| 45 | print STDERR "ClassifyTreeModel.addDocument(\"$value\", \"$oid\")\n" unless !$self->{'debug'};
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| 46 | # Generate a treepath object from the metadata value, remembering to prefix
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| 47 | # with the root nodes path
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| 48 | my $root_node_obj = $self->getRootNode();
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| 49 | my $path_obj = $root_node_obj->getPath();
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| 50 | $path_obj->addPathComponent($value);
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| 51 | # Ensure that this classifier node, and if necessary its ancestor nodes,
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| 52 | # exist in our tree.
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| 53 | my $node_obj = $self->getNodeByPath($path_obj);
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| 54 | if (!$node_obj)
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| 55 | {
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| 56 | # The node doesn't exist, so we need to add it
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| 57 | $node_obj = $self->addNode($path_obj);
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| 58 | }
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| 59 | # Add the document to the node.
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| 60 | $node_obj->addDocument($oid);
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| 61 | # Done.
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| 62 | }
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| 63 | # /** addDocument() **/
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| 64 |
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| 65 | # /** Add a node into the tree first ensuring all its parent nodes are inserted
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| 66 | # * to.
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| 67 | # *
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| 68 | # * @param $path_obj The path to insert the new node at
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| 69 | # *
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| 70 | # * @author John Thompson, DL Consulting Ltd.
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| 71 | # */
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| 72 | sub addNode()
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| 73 | {
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| 74 | my ($self, $path_obj) = @_;
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| 75 | print STDERR "ClassifyTreeModel.addNode(\"" . $path_obj->toString() . "\")\n" unless !$self->{'debug'};
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| 76 | # Ensure the parent exists, assuming we aren't at the root
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| 77 | my $parent_path_obj = $path_obj->getParentPath();
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| 78 | #rint STDERR "* parent path: " . $parent_path_obj->toString() . "\n";
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| 79 | my $parent_node_obj = $self->getNodeByPath($parent_path_obj);
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| 80 | #rint STDERR "* does parent node already exist? " . $parent_node_obj . "\n";
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| 81 | #rint STDERR "* are we at the root node yet? " . $parent_path_obj->isRootPath() . "\n";
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| 82 | if (!$parent_node_obj && !$parent_path_obj->isRootPath())
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| 83 | {
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| 84 | #rint STDERR "* recursive call!\n";
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| 85 | $parent_node_obj = $self->addNode($parent_path_obj);
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| 86 | }
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| 87 | # Insert this node into it's parent.
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| 88 | return $parent_node_obj->insertNode($path_obj);
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| 89 | }
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| 90 | # /** addNode() **/
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| 91 |
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| 92 | # /** Retrieve the name of the collection this model is drawing from.
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| 93 | # *
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| 94 | # * @return The collection name as a string
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| 95 | # *
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| 96 | # * @author John Thompson, DL Consulting Ltd.
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| 97 | # */
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| 98 | sub getCollection()
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| 99 | {
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| 100 | my ($self) = @_;
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| 101 | print STDERR "ClassifyTreeModel.getCollection()\n" unless !$self->{'debug'};
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| 102 | return $self->{'collection'};
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| 103 | }
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| 104 | # /** getCollection() **/
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| 105 |
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| 106 | # /** Retrieve a node from this tree based upon its CLID (OID).
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| 107 | # * @param $clid The CLID as a string
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| 108 | # * @return The indicated ClassifyTreeNode or null
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| 109 | sub getNodeByCLID()
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| 110 | {
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| 111 | my ($self, $clid) = @_;
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| 112 | print STDERR "ClassifyTreeModel.getNodeByCLID(\"$clid\")\n" unless !$self->{'debug'};
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| 113 | my $result = 0;
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| 114 | # Test if this clid is even in our tree
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| 115 | if($clid !~ /^$self->{'root'}/)
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| 116 | {
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| 117 | print STDERR "Requested node $clid, which isn't part of " . $self->{'root'} . "\n";
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| 118 | return 0;
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| 119 | }
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| 120 | # Unfortunately I have to check that there is text to retrieve before I
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| 121 | # create a new node.
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| 122 |
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| 123 | my $index_text_directory_path = &util::filename_cat($ENV{'GSDLHOME'}, "collect", $self->getCollection(), "index", "text");
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| 124 | my $infodb_file_path = &dbutil::get_infodb_file_path("gdbm", $self->getCollection(), $index_text_directory_path);
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| 125 | if (&dbutil::read_infodb_entry("gdbm", $infodb_file_path, $clid) =~ /\w+/)
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| 126 | {
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| 127 | # Since the CLID can directly reference the correct entry in the GDBM we
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| 128 | # just create the node and return it
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| 129 | $result = new ClassifyTreeNode($self, $clid);
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| 130 | }
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| 131 | return $result;
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| 132 | }
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| 133 |
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| 134 | # /** Retrieve a node from this tree based upon a path
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| 135 | # *
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| 136 | # * @param $path The path to the node as a ClassifyTreePath
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| 137 | # * @return The indicated ClassifyTreeNode or null
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| 138 | # *
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| 139 | # * @author John Thompson, DL Consulting Ltd.
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| 140 | # */
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| 141 | sub getNodeByPath()
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| 142 | {
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| 143 | my ($self, $path_obj) = @_;
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| 144 | print STDERR "ClassifyTreeModel.getNodeByPath(\"" . $path_obj->toString() . "\")\n" unless !$self->{'debug'};
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| 145 | # Starting at the ROOT of the tree, and with the first path component,
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| 146 | # recursively descend through the tree looking for the node - we can assume
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| 147 | # that we've found the root node (otherwise we won't be in a tree)
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| 148 | my $cur_node_obj = $self->getRootNode();
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| 149 | my $cur_path_obj = $cur_node_obj->getPath();
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| 150 | my $depth = 1;
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| 151 | # Continue till we either find the node we want, or run out a nodes
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| 152 | while(!$cur_node_obj->getPath()->equals($path_obj))
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| 153 | {
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| 154 | # Append the path component at this depth to the current path we
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| 155 | # are searching for
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| 156 | $cur_path_obj->addPathComponent($path_obj->getPathComponent($depth));
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| 157 | $depth++;
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| 158 | #rint STDERR "Searching " . $cur_node_obj->getPath()->toString() . "'s children for: " . $cur_path_obj->toString() . "\n";
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| 159 | # Search through the current nodes children, looking for one that
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| 160 | # matches the current path
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| 161 | my $found = 0;
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| 162 | foreach my $child_node_obj ($cur_node_obj->getChildren())
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| 163 | {
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| 164 | #rint STDERR "* testing " . $child_node_obj->getPath()->toString() . "\n";
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| 165 | if($child_node_obj->getPath()->equals($cur_path_obj))
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| 166 | {
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| 167 | $cur_node_obj = $child_node_obj;
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| 168 | $found = 1;
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| 169 | last;
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| 170 | }
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| 171 | }
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| 172 | # Couldn't find any node with this path
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| 173 | if(!$found)
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| 174 | {
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| 175 | #rint STDERR "* no such node exists!\n";
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| 176 | return 0;
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| 177 | }
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| 178 | }
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| 179 | return $cur_node_obj;
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| 180 | }
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| 181 | # /** getChild() **/
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| 182 |
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| 183 | # /** Retrieve the parent node of the given node.
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| 184 | # *
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| 185 | # * @param $child_node The node whose parent we want to retrieve
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| 186 | # * @return The parent node, or 0 if this is the root
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| 187 | # *
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| 188 | # * @author John Thompson, DL Consulting Ltd.
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| 189 | # */
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| 190 | sub getParentNode()
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| 191 | {
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| 192 | my ($self, $child_node) = @_;
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| 193 | print STDERR "ClassifyTreeModel.getParentNode()\n" unless !$self->{'debug'};
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| 194 | return $child_node->getParentNode();
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| 195 | }
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| 196 | # /** getParentNode() **/
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| 197 |
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| 198 | sub getRootNode()
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| 199 | {
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| 200 | my ($self) = @_;
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| 201 | print STDERR "ClassifyTreeModel.getRootNode()\n" unless !$self->{'debug'};
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| 202 | return new ClassifyTreeNode($self, $self->{'root'});
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| 203 | }
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| 204 |
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| 205 | # /** Remove the given document from the classifier tree, and then remove any
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| 206 | # * empty nodes if required.
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| 207 | # *
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| 208 | # * @param $value The value which contains the path of the node to remove
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| 209 | # * the document from
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| 210 | # * @param $oid The unique identifier of the document to remove
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| 211 | # * @param $remove_empty Sets whether empty nodes are removed
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| 212 | # *
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| 213 | # * @author John Thompson, DL Consulting Ltd.
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| 214 | # */
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| 215 | sub removeDocument()
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| 216 | {
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| 217 | my ($self, $path, $oid, $remove_empty) = @_;
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| 218 | print STDERR "ClassifyTreeModel.removeDocument(\"$path\",\"$oid\",$remove_empty)\n" unless !$self->{'debug'};
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| 219 | # Append to root path
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| 220 | my $root_node_obj = $self->getRootNode();
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| 221 | my $path_obj = $root_node_obj->getPath();
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| 222 | $path_obj->addPathComponent($path);
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| 223 | # Retrieve the node in question
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| 224 | my $node_obj = $self->getNodeByPath($path_obj);
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| 225 | # Check we retrieved a node
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| 226 | if ($node_obj)
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| 227 | {
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| 228 | # Remove the document
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| 229 | $node_obj->removeDocument($oid);
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| 230 | # If we have been asked to remove empty nodes, do so now.
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| 231 | if ($remove_empty)
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| 232 | {
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| 233 | my $cur_node_obj = $node_obj;
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| 234 | my $empty_node_obj = 0;
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| 235 | while ($cur_node_obj->getNumLeafDocs() == 0)
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| 236 | {
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| 237 | $empty_node_obj = $cur_node_obj;
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| 238 | $cur_node_obj = $cur_node_obj->getParentNode();
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| 239 | }
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| 240 | if ($empty_node_obj)
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| 241 | {
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| 242 | # Try to retrieve the parent of this node
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| 243 | my $parent_node_obj = $empty_node_obj->getParentNode();
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| 244 | # As long as we have a parent (i.e. we aren't the root node) go
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| 245 | # ahead and delete this subtree starting at empty node
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| 246 | if ($parent_node_obj)
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| 247 | {
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| 248 | $parent_node_obj->removeNode($empty_node_obj);
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| 249 | }
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| 250 | }
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| 251 | }
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| 252 | }
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| 253 | # If the node doesn't exist in this tree, then we can't very well remove
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| 254 | # anything from it!
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| 255 | }
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| 256 | # /** removeDocument() **/
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| 257 |
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| 258 | 1;
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