diff options
Diffstat (limited to 'includes/pear/Structures/Graph.php')
| -rw-r--r-- | includes/pear/Structures/Graph.php | 154 |
1 files changed, 0 insertions, 154 deletions
diff --git a/includes/pear/Structures/Graph.php b/includes/pear/Structures/Graph.php deleted file mode 100644 index 3757f15..0000000 --- a/includes/pear/Structures/Graph.php +++ /dev/null @@ -1,154 +0,0 @@ -<?php -/* vim: set expandtab tabstop=4 shiftwidth=4 foldmethod=marker: */ -// +-----------------------------------------------------------------------------+ -// | Copyright (c) 2003 Sérgio Gonçalves Carvalho | -// +-----------------------------------------------------------------------------+ -// | This file is part of Structures_Graph. | -// | | -// | Structures_Graph is free software; you can redistribute it and/or modify | -// | it under the terms of the GNU Lesser General Public License as published by | -// | the Free Software Foundation; either version 2.1 of the License, or | -// | (at your option) any later version. | -// | | -// | Structures_Graph is distributed in the hope that it will be useful, | -// | but WITHOUT ANY WARRANTY; without even the implied warranty of | -// | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | -// | GNU Lesser General Public License for more details. | -// | | -// | You should have received a copy of the GNU Lesser General Public License | -// | along with Structures_Graph; if not, write to the Free Software | -// | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | -// | 02111-1307 USA | -// +-----------------------------------------------------------------------------+ -// | Author: Sérgio Carvalho <sergio.carvalho@portugalmail.com> | -// +-----------------------------------------------------------------------------+ -// -/** - * The Graph.php file contains the definition of the Structures_Graph class - * - * @see Structures_Graph - * @package Structures_Graph - */ - -/* dependencies {{{ */ -/** PEAR base classes */ -require_once 'PEAR.php'; -/** Graph Node */ -require_once 'Structures/Graph/Node.php'; -/* }}} */ - -define('STRUCTURES_GRAPH_ERROR_GENERIC', 100); - -/* class Structures_Graph {{{ */ -/** - * The Structures_Graph class represents a graph data structure. - * - * A Graph is a data structure composed by a set of nodes, connected by arcs. - * Graphs may either be directed or undirected. In a directed graph, arcs are - * directional, and can be traveled only one way. In an undirected graph, arcs - * are bidirectional, and can be traveled both ways. - * - * @author Sérgio Carvalho <sergio.carvalho@portugalmail.com> - * @copyright (c) 2004 by Sérgio Carvalho - * @package Structures_Graph - */ -/* }}} */ -class Structures_Graph { - /* fields {{{ */ - /** - * @access private - */ - var $_nodes = array(); - /** - * @access private - */ - var $_directed = false; - /* }}} */ - - /* Constructor {{{ */ - /** - * - * Constructor - * - * @param boolean Set to true if the graph is directed. Set to false if it is not directed. (Optional, defaults to true) - * @access public - */ - function Structures_Graph($directed = true) { - $this->_directed = $directed; - } - /* }}} */ - - /* isDirected {{{ */ - /** - * - * Return true if a graph is directed - * - * @return boolean true if the graph is directed - * @access public - */ - function isDirected() { - return (boolean) $this->_directed; - } - /* }}} */ - - /* addNode {{{ */ - /** - * - * Add a Node to the Graph - * - * @param Structures_Graph_Node The node to be added. - * @access public - */ - function addNode(&$newNode) { - // We only add nodes - if (!is_a($newNode, 'Structures_Graph_Node')) return Pear::raiseError('Structures_Graph::addNode received an object that is not a Structures_Graph_Node', STRUCTURES_GRAPH_ERROR_GENERIC); - // Graphs are node *sets*, so duplicates are forbidden. We allow nodes that are exactly equal, but disallow equal references. - foreach($this->_nodes as $key => $node) { - /* - ZE1 equality operators choke on the recursive cycle introduced by the _graph field in the Node object. - So, we'll check references the hard way (change $this->_nodes[$key] and check if the change reflects in - $node) - */ - $savedData = $this->_nodes[$key]; - $referenceIsEqualFlag = false; - $this->_nodes[$key] = true; - if ($node === true) { - $this->_nodes[$key] = false; - if ($node === false) $referenceIsEqualFlag = true; - } - $this->_nodes[$key] = $savedData; - if ($referenceIsEqualFlag) return Pear::raiseError('Structures_Graph::addNode received an object that is a duplicate for this dataset', STRUCTURES_GRAPH_ERROR_GENERIC); - } - $this->_nodes[] =& $newNode; - $newNode->setGraph($this); - } - /* }}} */ - - /* removeNode (unimplemented) {{{ */ - /** - * - * Remove a Node from the Graph - * - * @todo This is unimplemented - * @param Structures_Graph_Node The node to be removed from the graph - * @access public - */ - function removeNode(&$node) { - } - /* }}} */ - - /* getNodes {{{ */ - /** - * - * Return the node set, in no particular order. For ordered node sets, use a Graph Manipulator insted. - * - * @access public - * @see Structures_Graph_Manipulator_TopologicalSorter - * @return array The set of nodes in this graph - */ - function &getNodes() { - return $this->_nodes; - } - /* }}} */ -} -?> |