ilDOMXML Class Reference

domxml wrapper class This class provides some more complex methods to access a domDocument via DOMXML. More...

Collaboration diagram for ilDOMXML:

Public Member Functions
	ilDOMXML ()
	Constructor init domxml handler You may (a) initiate this class with an existing domDocument OR (b) create a new domDocument depending on the parameters you pass to this constructor:
	_ilDOMXML ()
	initNewDocument ($a_version="", $a_encoding="", $a_charset="")
	init new domDocument private method.
	createRootElement ($a_element)
	wrapper for crating a root element this methods avoids creating multiple elements on root level.
	loadDocument ($a_filename, $a_filepath, $a_validate=false)
	loads a xml-document from file and build a DOM representation in $this->doc.
	trim ($a_node)
	traverse domDocument and removes all useless nodes that are created due to whitespaces in the source file
	trimDocument ($a_node= '')
	wrapper for $this->trim defaults to $this->doc if no node given and returns cleaned dom document
	transform ($node, $left2=-1, $lvl=0)
	traverse the domDocument and build a tree which contains additional information about domDocument's structure: $arr[id] = array( content (str) = node_value (only text nodes have a value) name (str) = tagname or entityname type (int) = element_type_id depth (int) = depth of node in tree parent (int) = id of parent node first (int) = id of first child node prev (int) = id of previous sibling node next (int) = id of next sibling node left (int) = left value (for traversing tree in relational DB) right (int) = right value (for traversing tree in relational DB)) The key is the internal id of the domDocument.
	buildTree ($a_node="")
	wrapper for $this->transform defaults to $this->doc if no node given and returns $this->tree
	dumpDocument ($a_stdout=-1, $a_compress=false, $a_format=false)
	wrapper for dump_mem() and dump_file() converts the entire DOM tree in $this->doc to a string optional: writes the string to a file if path & filename is specified.
	getTextFromElement ($a_element)
	fetch all text parts from an element even when the text is interupted by another element example: <paragraph>This text ispart of the same element.
	isLeafElement ($a_node, $a_elementname, $a_num=0)
	find leaf elements.
	getElementsByTagname ($a_elementname, $a_node="")
	wrapper for get_elements_by_tagname searches domDocument for specified elementname, starting at $a_node.
	appendReferenceNodeForLO ($a_node, $a_lo_id, $a_lm_id, $a_prev_sibling)
	creates an element entry for the removed LearningObject: <LO id=[obj_id of child LO] />
	appendChild ($a_node)
	wrapper for append_child Main purpose of this method is to simplify access of DOM-Functions.
	getRoot ()
	wrapper for document_element Main purpose of this method is to simplify access of DOM-Functions.
	createElement ($a_node)
	wrapper for create_element Main purpose of this method is to simplify access of DOM-Functions.
	addElement ($a_parent, $a_node)
	createText ($a_text)
	wrapper for create_element Main purpose of this method is to simplify access of DOM-Functions.
	createNode ($a_parent, $a_elementname, $a_attr_list=NULL, $a_text=NULL)
	creates a complete node of type element with a text_node within the element and attributes The node is append to domDocument under the given parent_node
	getElementId ($a_node)
	get internal reference id of a domNode
	getElementName ($a_node)
	get node_name
	setEncoding ($a_encode, $a_overwrite=false)
	set encoding of domDocument
	getEncoding ()
	get encoding of domDocument
	setCharset ($a_charset, $a_overwrite=false)
	set charset of domDocument
	getCharset ()
	get charset of domDocument
	getInfo ()
	fetch Title & Description from MetaData-Section of domDocument
	getReferences ()
	get all LO references in Learning Object

Data Fields
	$doc
	$tree
	$error

Detailed Description

domxml wrapper class This class provides some more complex methods to access a domDocument via DOMXML.

For basic tasks when building xml-documents please use the standard functions from the domxml extension of PHP

Author

Sascha Hofmann shofm.nosp@m.ann@.nosp@m.datab.nosp@m.ay.d.nosp@m.e

Version

Id:

class.ilDOMXML.php 1301 2003-05-16 13:39:22Z smeyer

Definition at line 35 of file class.ilDOMXML.php.

Member Function Documentation

ilDOMXML::_ilDOMXML

(

)

Definition at line 93 of file class.ilDOMXML.php.

        {
                if (DEBUG)
                {
            printf("domxml destructor called, class=%s\n", get_class($this)."<br/>");
        }
        }

ilDOMXML::addElement	(		$a_parent,
			$a_node
	)

Definition at line 545 of file class.ilDOMXML.php.

        {
                $node = $this->doc->create_element($a_node);
                $node = $a_parent->append_child($node);
                
                return $node;
        }

ilDOMXML::appendChild

(

$a_node

)

wrapper for append_child Main purpose of this method is to simplify access of DOM-Functions.

Parameters

object

domNode

Returns

object domNode public

Definition at line 515 of file class.ilDOMXML.php.

Referenced by createRootElement().

        {
                return $this->doc->append_child($a_node);
        }

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ilDOMXML::appendReferenceNodeForLO	(		$a_node,
			$a_lo_id,
			$a_lm_id,
			$a_prev_sibling
	)

creates an element entry for the removed LearningObject: <LO id=[obj_id of child LO] />

Parameters

object	domNode
integer	object_id of removed LO public

TODO: Moved this method to class where it fits better (LearningObject? xml2sql?)

Definition at line 490 of file class.ilDOMXML.php.

References createElement().

        {
                $newnode = $this->createElement("LO");
                
                if (empty($a_prev_sibling))
                {
                        $node = $a_node->append_child($newnode);
                }
                else
                {
                        $node = $a_prev_sibling->append_sibling($newnode);
                }

                $node->set_attribute("id",$a_lo_id);
                $node->set_attribute("lm",$a_lm_id);
        }

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ilDOMXML::buildTree

(

$a_node = ""

)

wrapper for $this->transform defaults to $this->doc if no node given and returns $this->tree

Parameters

object

domNode

Returns

array tree structure of domDocument. Returns the array described in $this->transform public

Definition at line 364 of file class.ilDOMXML.php.

References $doc, $tree, and transform().

        {
                if (empty($a_node)) {
                        $a_node = $this->doc;
                }
                
                $this->transform($a_node,1);
                
                return $this->tree;
        }

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ilDOMXML::createElement

(

$a_node

)

wrapper for create_element Main purpose of this method is to simplify access of DOM-Functions.

Parameters

object

domNode

Returns

object domNode public

Definition at line 540 of file class.ilDOMXML.php.

Referenced by appendReferenceNodeForLO(), createNode(), and createRootElement().

        {
                return $this->doc->create_element($a_node);
        }

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ilDOMXML::createNode	(		$a_parent,
			$a_elementname,
			$a_attr_list = NULL,
			$a_text = NULL
	)

creates a complete node of type element with a text_node within the element and attributes The node is append to domDocument under the given parent_node

Parameters

object	domNode the place where the new created node will be inserted
string	name of the element
array	list of attributes (optional). syntax: $arr["attr_name"] = attr_value
string	if any text is given a text_node will be created (optional).

Returns

object domNode just created public

Definition at line 578 of file class.ilDOMXML.php.

References createElement().

        {
                // create new element node
                $node = $this->createElement($a_elementname);
                
                // set attributes
                if (is_array($a_attr_list)) {
                        foreach ($a_attr_list as $attr => $value) {
                                $node->set_attribute($attr, $value);
                        }
                }
                
                // create and add a text node to the new element node
                if (is_string($a_text)) {
                        $node_text = $this->doc->create_text_node($a_text);
                        $node_text = $node->append_child($node_text);
                }
                
                // add element node at at the end of the children of the parent
                $node = $a_parent->append_child($node);
                
                return $node;
        }

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ilDOMXML::createRootElement

(

$a_element

)

wrapper for crating a root element this methods avoids creating multiple elements on root level.

This is necessary since PHP crashes if you try to create another element on top level of domDocument :-(

Parameters

string

taggname of root element public

Definition at line 151 of file class.ilDOMXML.php.

References appendChild(), createElement(), and getRoot().

        {
                // check if rootNode already exists
                if ($root = $this->getRoot()) {
                        return false;
                }
                
                return $this->appendChild($this->createElement($a_element));
        }

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ilDOMXML::createText

(

$a_text

)

wrapper for create_element Main purpose of this method is to simplify access of DOM-Functions.

Parameters

object

domNode

Returns

object domNode public

Definition at line 561 of file class.ilDOMXML.php.

        {
                return $this->doc->create_text_node($a_text);
        }

ilDOMXML::dumpDocument	(		$a_stdout = -1,
			$a_compress = false,
			$a_format = false
	)

wrapper for dump_mem() and dump_file() converts the entire DOM tree in $this->doc to a string optional: writes the string to a file if path & filename is specified.

Otherwise only the string is returned.

Parameters

string	path/filename
boolean	compress XML content
boolean	format XML content with whitespaces

Returns

string XML content in a string public

Definition at line 387 of file class.ilDOMXML.php.

        {
                if ($a_stdout != -1) {
                        $this->doc->dump_file($a_stdout,$a_compress,$a_format);
                }
                
                return $this->doc->dump_mem();
        }

ilDOMXML::getCharset

(

)

get charset of domDocument

Returns

string charset public

Definition at line 680 of file class.ilDOMXML.php.

        {
                return $this->doc->charset;
        }

ilDOMXML::getElementId

(

$a_node

)

get internal reference id of a domNode

Parameters

object

domNode

Returns

integer internal Id of domNode public

Definition at line 609 of file class.ilDOMXML.php.

        {
                $node = (array) $a_node;
                return $node[0];
        }

ilDOMXML::getElementName

(

$a_node

)

get node_name

Parameters

object

domNode

Returns

string name of domNode public

Definition at line 622 of file class.ilDOMXML.php.

        {
                return $a_node->node_name();
        }

ilDOMXML::getElementsByTagname	(		$a_elementname,
			$a_node = ""
	)

wrapper for get_elements_by_tagname searches domDocument for specified elementname, starting at $a_node.

If no node was given searches the entire domDocument in $this->doc returns an array of all nodes found

Parameters

string	tagname of element
object	domNode where to start searching (optional)

Returns

array domNodes (object) which have specified elementname public

Definition at line 467 of file class.ilDOMXML.php.

References $doc.

Referenced by getInfo(), and getReferences().

        {
                if (empty($a_node)) {
                        $a_node = $this->doc;
                }
                
                if (count($node = $a_node->get_elements_by_tagname($a_elementname)) > 0) {
                        return $node;
                }
                
                return false;
        }

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ilDOMXML::getEncoding

(

)

get encoding of domDocument

Returns

string encoding charset public

Definition at line 651 of file class.ilDOMXML.php.

        {
                return $this->doc->encoding;
        }

ilDOMXML::getInfo

(

)

fetch Title & Description from MetaData-Section of domDocument

Returns

array Titel & Description public

Definition at line 691 of file class.ilDOMXML.php.

References getElementsByTagname().

        {
                $node = $this->getElementsByTagname("MetaData");

                if($node !== false)
                {
                        $childs = $node[0]->child_nodes();

                        foreach ($childs as $child)
                        {
                                        if (($child->node_type() == XML_ELEMENT_NODE) && ($child->tagname == "General"))
                                        {
                                                $childs2 = $child->child_nodes();

                                                foreach ($childs2 as $child2)
                                                {
                                                        if (($child2->node_type() == XML_ELEMENT_NODE) && ($child2->tagname == "Title" || $child2->tagname == "Description"))
                                                        {
                                                                $arr[$child2->tagname] = $child2->get_content();
                                                        }
                                                }

                                                // General-tag was found. Stop foreach-loop
                                                break;
                                        }
                        }
                }

                // for compatibility reasons:
                $arr["title"] = $arr["Title"];
                $arr["desc"] = $arr["Description"];

                return $arr;
        }

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ilDOMXML::getReferences

(

)

get all LO references in Learning Object

Returns

array object ids of LearningObjects public

Definition at line 732 of file class.ilDOMXML.php.

References getElementsByTagname().

        {
                if ($nodes = $this->getElementsByTagname("LO"))
                {
                        foreach ($nodes as $node)
                        {
                                $attr[] = $node->get_attribute("id");
                        }
                }

                return $attr;
        }

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ilDOMXML::getRoot

(

)

wrapper for document_element Main purpose of this method is to simplify access of DOM-Functions.

Returns

object domNode public

Definition at line 527 of file class.ilDOMXML.php.

Referenced by createRootElement().

        {
                return $this->doc->document_element();
        }

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ilDOMXML::getTextFromElement

(

$a_element

)

fetch all text parts from an element even when the text is interupted by another element example: <paragraph>This text ispart of the same element.

</paragraph> This method returns: This text is part of the same element.

Parameters

object

dom node of type ELEMENT (id:1)

Returns

string text of entire element public

Definition at line 408 of file class.ilDOMXML.php.

References trim().

        {
                if ($a_element->node_type() == XML_ELEMENT_NODE) {
                        $value = "";
                
                        foreach ($a_element->child_nodes() as $child) {
                                if ($child->node_type() == XML_TEXT_NODE) {
                                        $value .= $child->content;
                                }
                        }
                
                        return trim($value);
                }
                
                die("<b>".$a_element."</b> is not a valid element node!");
        }

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ilDOMXML::ilDOMXML

(

)

Constructor init domxml handler You may (a) initiate this class with an existing domDocument OR (b) create a new domDocument depending on the parameters you pass to this constructor:

(a) init existing domDocument

Parameters

object

domDocument

(b) init new domDocument

Parameters

string	xml version (optional)
string	encoding charset (optional)
string	charset (optional) public

Definition at line 78 of file class.ilDOMXML.php.

References initNewDocument().

        {
                $num = func_num_args();
                $args = func_get_args();
                
                if (($num == 1) && is_object($args[0]))
                {
                        $this->doc = $args[0];
                }
                else
                {
                        $this->initNewDocument($args[0],$args[1],$args[2]);
                }
        }

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ilDOMXML::initNewDocument	(		$a_version = "",
			$a_encoding = "",
			$a_charset = ""
	)

init new domDocument private method.

Please use constructor to init a new domDocument

Parameters

string	xml version (default: 1.0)
string	encoding charset (default: UTF-8)
string	charset (default: UTF-8) private

Definition at line 112 of file class.ilDOMXML.php.

References domxml_open_mem(), setCharset(), and setEncoding().

Referenced by ilDOMXML().

        {
                if (!$a_version) {
                        $a_version = "1.0";
                }

                if (!$a_encoding) {
                        $a_encoding = "UTF-8";
                }

                if (!$a_charset) {
                        $a_charset = "UTF-8";
                }

                // create the xml string (workaround for domxml_new_doc) ***
                $xmlHeader = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>". // *** ISO-8859-1
                                         "<root />"; // dummy node
                
                // create a domxml document object
                $this->doc = domxml_open_mem($xmlHeader); // *** Fehlerabfrage

                // delete dummy node 
                $root = $this->doc->document_element();
                $root->unlink_node();
                
                //$this->doc = new_xmldoc($a_version);
                $this->setEncoding($a_encoding);
                $this->setCharset($a_charset);
        }

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ilDOMXML::isLeafElement	(		$a_node,
			$a_elementname,
			$a_num = 0
	)

find leaf elements.

In this context leaf elements are defined as elements that don't contain other elements of the same type!

Parameters

object	domNode of type ELEMENT
string	tagname your are looking for
integer	auxilliary variable to avoid counting start node itself. must set to 1 for the first function call

Returns

array domNodes (object) which are leaf elements public

Definition at line 435 of file class.ilDOMXML.php.

        {
                $var = true;
                
                if ($childs = $a_node->child_nodes()) {
                        foreach ($childs as $child) {
                                $var = $this->isLeafElement($child, $a_elementname);

                                if (!$var) {
                                        return false;
                                }
                        }
                }

                if (($a_node->node_type() == XML_ELEMENT_NODE) && ($a_node->tagname == $a_elementname) && ($a_num != 1)) {
                        return false;
                }
                
                return $var;
        }

ilDOMXML::loadDocument	(		$a_filename,
			$a_filepath,
			$a_validate = false
	)

loads a xml-document from file and build a DOM representation in $this->doc.

The xml-document is parsed automatically. You may also validate it against a DTD by setting the 3rd parameter to 'true'

Parameters

string	filename
string	filepath
boolean	set mode: parsing (false,default) or validating (true) public

Definition at line 172 of file class.ilDOMXML.php.

References $doc, $error, domxml_open_file(), exit, setCharset(), and setEncoding().

        {
                if ($a_validate) {
                        $mode = DOMXML_LOAD_VALIDATING;
                } else {
                        $mode = DOMXML_LOAD_PARSING;
                } 

                $this->doc = domxml_open_file($a_filepath . "/" . $a_filename, $mode, $this->error);

                // stop parsing if an error occured
                if ($this->error) {
                        $error_msg = "Error(s) while parsing the document!<br><br>";

                        foreach ($this->error as $error) {
                                $error_msg .= $error["errormessage"]." in line: ".$error["line"]."<br>";
                        }
                        
                        // error handling with ilias object?
                        echo $error_msg;
                        exit();
                }
                
                // set encoding to UTF-8 if empty
                $this->setEncoding("iso-8859-1",true);
                // set charset to UTF-8
                $this->setCharset("iso-8859-1");

                return $this->doc; 
        }

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ilDOMXML::setCharset	(		$a_charset,
			$a_overwrite = false
	)

set charset of domDocument

Parameters

string	charset
boolean	overwrite existing charset (true) or not (false)

Returns

boolean returns true when charset was sucessfully changed public

Definition at line 664 of file class.ilDOMXML.php.

Referenced by initNewDocument(), and loadDocument().

        {
                if (is_integer($this->doc->charset) or ($a_overwrite)) {
                        $this->doc->charset = $a_charset;
                        return true;
                }
                
                return false;
        }

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ilDOMXML::setEncoding	(		$a_encode,
			$a_overwrite = false
	)

set encoding of domDocument

Parameters

string	encoding charset
boolean	overwrite existing encoding charset (true) or not (false)

Returns

boolean returns true when encoding was sucessfully changed public

Definition at line 635 of file class.ilDOMXML.php.

Referenced by initNewDocument(), and loadDocument().

        {
                if (empty($this->doc->encoding) or ($a_overwrite)) {
                        $this->doc->encoding = $a_encode;
                        return true;
                }
                
                return false;
        }

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ilDOMXML::transform	(		$node,
			$left2 = -1,
			$lvl = 0
	)

traverse the domDocument and build a tree which contains additional information about domDocument's structure: $arr[id] = array( content (str) = node_value (only text nodes have a value) name (str) = tagname or entityname type (int) = element_type_id depth (int) = depth of node in tree parent (int) = id of parent node first (int) = id of first child node prev (int) = id of previous sibling node next (int) = id of next sibling node left (int) = left value (for traversing tree in relational DB) right (int) = right value (for traversing tree in relational DB)) The key is the internal id of the domDocument.

Also the ids of other nodes are internal references. The array is written to $this->tree. Use $this->buildTree() to return the variable.

Parameters

object	domNode
integer	left value (optional; only needed for recursion))
integer	depth of node in tree (optional, default is 0) private

Definition at line 266 of file class.ilDOMXML.php.

References $data, and trim().

Referenced by buildTree().

        { 
                static $left;
                
                // set depth
                $lvl++;

                // start value given from outside?
                if ($left2 > 0) {
                        $left = $left2;
                } 
                // set default value 1 if no value given
                if (!$left) {
                        $left = 1;
                } 

                $node2 = (array)$node;
                
                // init structure data
                // provides additional information about document structure
                // bitwise:
                // 1: has attributes
                // 2: has text element 
                $this->tree[$node2[0]]["struct"] = 0;

                if ($parent = $node->parent_node()) {
                        $parent = (array)$parent;
                } 

                if ($first = $node->first_child())
                {
                        $first = (array)$first;
                } 

                if ($prev = $node->previous_sibling()) {
                        $prev = (array)$prev;
                } 

                if ($next = $node->next_sibling()) {
                        $next = (array)$next;
                } 

                $this->tree[$node2[0]]["content"] = trim($node->node_value());
                $this->tree[$node2[0]]["name"] = $node->node_name();
                $this->tree[$node2[0]]["type"] = $node->type;
                $this->tree[$node2[0]]["depth"] = $lvl;
                $this->tree[$node2[0]]["parent"] = $parent[0];
                $this->tree[$node2[0]]["first"] = $first[0];
                $this->tree[$node2[0]]["prev"] = $prev[0];
                $this->tree[$node2[0]]["next"] = $next[0];
                $this->tree[$node2[0]]["left"] = $left;
                $left++;

                // write attributes to sub-array
                if ($node->has_attributes())
                {
                        $data = "";
                        
                        foreach ($node->attributes() as $attribute)
                        {
                                $data[$attribute->name] = $attribute->value;
                        }

                        $this->tree[$node2[0]]["attr_list"] = $data;
                        $this->tree[$node2[0]]["struct"] += 1;
                }

                // check if one child is a text_node
                foreach ($node->child_nodes() as $child)
                {
                        if ($child->node_type() == XML_TEXT_NODE)
                        {
                                $this->tree[$node2[0]]["struct"] += 2;
                                break;
                        }
                }
                
                // recursive call
                // please don't merge this loop with the one above together! 
                foreach ($node->child_nodes() as $child)
                {
                        $this->transform($child, $left, $lvl);
                }
                
                $this->tree[$node2[0]]["right"] = $left;
                $left++;
        }

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ilDOMXML::trim

(

$a_node

)

traverse domDocument and removes all useless nodes that are created due to whitespaces in the source file

Parameters

object

domNode private

Definition at line 210 of file class.ilDOMXML.php.

Referenced by getTextFromElement(), transform(), and trimDocument().

        {
                if ($a_node->has_child_nodes()) {
                        $childs = $a_node->child_nodes();

                        foreach ($childs as $child) {
                                $content = trim($child->get_content());

                                if (empty($content)) {
                                        $child->unlink_node();
                                } else {
                                        $this->trim($child);
                                } 
                        } 
                } 
        }

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ilDOMXML::trimDocument

(

$a_node = ''

)

wrapper for $this->trim defaults to $this->doc if no node given and returns cleaned dom document

Parameters

object

domNode (optional) public

Definition at line 235 of file class.ilDOMXML.php.

References $doc, and trim().

        {
                if (empty($a_node))     {
                        $a_node = $this->doc;
                }
        
                $this->trim($a_node);
                return $a_node;
        }

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Field Documentation

ilDOMXML::$doc

Definition at line 43 of file class.ilDOMXML.php.

Referenced by buildTree(), getElementsByTagname(), loadDocument(), and trimDocument().

ilDOMXML::$error

Definition at line 60 of file class.ilDOMXML.php.

Referenced by loadDocument().

ilDOMXML::$tree

Definition at line 51 of file class.ilDOMXML.php.

Referenced by buildTree().

---

The documentation for this class was generated from the following file:

• classes/class.ilDOMXML.php