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git-svn-id: http://svn.php.net/repository/pear/packages/Structures_Graph/trunk@158018 c90b9560-bf6c-de11-be94-00142212c4b1
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commit d6bb0250baebdde12200e7df1ba8c3c5fd0bb360 1 parent 91edafc
Sergio Carvalho authored
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  1. +0 −156 Structures/Graph/Graph.php
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156 Structures/Graph/Graph.php
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-<?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($newNode, 'Structures_Graph_Node'))
- Pear::raiseError('Structures_Graph::addNode received an object that is not a Structures_Graph_Node', STRUCTURES_GRAPH_ERROR_GENERIC);
- // Graphs are node *sets*, so duplicates are forbidden. We allow nodes that are exactly equal, but disallow equal references.
- foreach($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
- */
- $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)
- 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;
- }
- /* }}} */
-}
-?>
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