Collaboration diagram for ilPreview:

Public Member Functions
	__construct ($a_obj_id, $a_type="")
	Creates a new ilPreview.
	exists ()
	Determines whether the preview exists or not.
	create ($a_obj, $a_force=false)
	Creates the preview.
	delete ()
	Deletes the preview.
	getImages ()
	Gets an array of preview images.
	save ()
	Saves the preview data to the database.
	getObjId ()
	Gets the id of the object the preview is for.
	getObjType ()
	Gets the type of the object the preview is for.
	getStoragePath ()
	Gets the path where the previews are stored relative to the web directory.
	getAbsoluteStoragePath ()
	Gets the absolute path where the previews are stored.
	getFilePathFormat ()
	Gets the absolute file path for preview images that contains a placeholder in the file name ('%02d') to be formatted with the preview number (use 'sprintf' for that).
	getRenderDate ()
	Gets the date when the preview was rendered.
	setRenderDate ($a_date)
	Sets the date when the preview was rendered.
	getRenderStatus ()
	Gets the status of the rendering process.
	setRenderStatus ($a_status)
	Sets the status of the rendering process.
	getStorage ()
	Gets the storage object for the preview.

Static Public Member Functions
static	createPreview ($a_obj, $a_force=false)
	Creates the preview for the object with the specified id.
static	deletePreview ($a_obj_id)
	Deletes the preview for the object with the specified id.
static	copyPreviews ($a_src_id, $a_dest_id)
	Copies the preview images from one preview to a new preview object.
static	hasPreview ($a_obj_id, $a_type="")
	Determines whether the object with the specified reference id has a preview.
static	lookupRenderStatus ($a_obj_id)
	Gets the render status for the object with the specified id.

Data Fields
const	RENDER_STATUS_NONE = "none"
const	RENDER_STATUS_PENDING = "pending"
const	RENDER_STATUS_CREATED = "created"
const	RENDER_STATUS_FAILED = "failed"
const	FILENAME_FORMAT = "preview_%02d.jpg"

Protected Member Functions
	doCreate ()
	Create entry in database.
	doRead ()
	Read data from database.
	doUpdate ()
	Update data in database.
	doDelete ()
	Delete data from database.

Private Member Functions
	init ()
	Initializes the preview object.

Private Attributes
	$obj_id = null
	$obj_type = null
	$storage = null
	$exists = false
	$render_date = false
	$render_status = self::RENDER_STATUS_NONE

Detailed Description

Definition at line 17 of file class.ilPreview.php.

Constructor & Destructor Documentation

ilPreview::__construct	(	$a_obj_id,
		$a_type = `""`
	)

Creates a new ilPreview.

Parameters

int	$a_obj_id	The object id.
int	$a_type	The type of the object.

Definition at line 69 of file class.ilPreview.php.

References init().

        {
                $this->obj_id = $a_obj_id;
                $this->obj_type = $a_type;
                
                $this->init();
        }

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Member Function Documentation

static ilPreview::copyPreviews	(	$a_src_id,
		$a_dest_id
	)

static

Copies the preview images from one preview to a new preview object.

Parameters

int	$a_src_id	The id of the object to copy from.
int	$a_dest_id	The id of the object to copy to.

Definition at line 107 of file class.ilPreview.php.

References ilPreviewSettings\isPreviewEnabled(), and ilUtil\rCopy().

Referenced by ilObjFile\doCloneObject().

        {
                if (!ilPreviewSettings::isPreviewEnabled())             
                        return;
                
                // get source preview
                $src = new ilPreview($a_src_id);
                $status = $src->getRenderStatus();
                
                // created? copy the previews
                if ($status == self::RENDER_STATUS_CREATED)
                {
                        // create destination preview and set it's properties
                        $dest = new ilPreview($a_dest_id);
                        $dest->setRenderDate($src->getRenderDate());
                        $dest->setRenderStatus($src->getRenderStatus());
                        
                        // create path
                        $dest->getStorage()->create();
                        
                        // copy previews
                        ilUtil::rCopy($src->getStoragePath(), $dest->getStoragePath());         
                        
                        // save copy
                        $dest->doCreate();
                }
                else
                {
                        // all other status need no action
                        // self::RENDER_STATUS_FAILED
                        // self::RENDER_STATUS_NONE
                        // self::RENDER_STATUS_PENDING
                }       
        }

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ilPreview::create	(	$a_obj,
		$a_force = `false`
	)

Creates the preview.

Parameters

ilObject	$a_obj	The object to create the preview for.
bool	$a_force	true, to force the creation of the preview; false, to create the preview only if needed.

Returns: bool true, if the preview was created; otherwise, false.

Definition at line 193 of file class.ilPreview.php.

References getRenderDate(), ilRendererFactory\getRenderer(), getRenderStatus(), getStorage(), ilPreviewSettings\isPreviewEnabled(), and save().

        {
                if (!ilPreviewSettings::isPreviewEnabled())             
                        return false;
                
                // get renderer for preview
                require_once("./Services/Preview/classes/class.ilRendererFactory.php");
                $renderer = ilRendererFactory::getRenderer($this);
                
                // no renderer available?
                if ($renderer == null)
                        return false;
                
                // exists, but still pending?
                if ($this->getRenderStatus() == self::RENDER_STATUS_PENDING)
                        return false;
                
                // not forced? check if update really needed
                if ($this->getRenderStatus() == self::RENDER_STATUS_CREATED && !$a_force)
                {
                        // check last modified against last render date
                        if ($a_obj->getLastUpdateDate() <= $this->getRenderDate())
                                return false;
                }
                
                // re-create the directory to store the previews
                $this->getStorage()->delete();
                $this->getStorage()->create();
                
                // let the renderer create the preview
                $renderer->render($this, $a_obj, true);
                
                // save to database
                $this->save();
                
                return true;
        }

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static ilPreview::createPreview	(	$a_obj,
		$a_force = `false`
	)

static

Creates the preview for the object with the specified id.

Parameters

ilObject	$a_obj	The object to create the preview for.
bool	$a_force	true, to force the creation of the preview; false, to create the preview only if needed.

Returns: bool true, if the preview was created; otherwise, false.

Definition at line 84 of file class.ilPreview.php.

References $preview.

        {
                $preview = new ilPreview($a_obj->getId(), $a_obj->getType());
                return $preview->create($a_obj, $a_force);
        }

ilPreview::delete ( )

Deletes the preview.

Definition at line 234 of file class.ilPreview.php.

References doDelete(), exists(), getStorage(), and RENDER_STATUS_NONE.

        {
                // does exist?
                if ($this->exists())
                {
                        // delete files and database entry
                        $this->getStorage()->delete();
                        $this->doDelete();
                        
                        // reset values
                        $this->exists = false;
                        $this->render_date = false;
                        $this->render_status = self::RENDER_STATUS_NONE;
                }
        }

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static ilPreview::deletePreview ( $a_obj_id )

static

Deletes the preview for the object with the specified id.

Parameters

int $a_obj_id The id of the object to create the preview for.

Definition at line 95 of file class.ilPreview.php.

References $preview.

        {
                $preview = new ilPreview($a_obj_id);
                $preview->delete();             
        }

ilPreview::doCreate ( )

protected

Create entry in database.

Definition at line 312 of file class.ilPreview.php.

References exists(), getObjId(), getRenderDate(), and getRenderStatus().

Referenced by save().

        {
                global $ilDB;
                
                $ilDB->insert(
                        "preview_data", 
                        array(
                                "obj_id" => array("integer", $this->getObjId()),
                                "render_date" => array("timestamp", $this->getRenderDate()),
                                "render_status" => array("text", $this->getRenderStatus())
                        )
                );
                $this->exists = true;
        }

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ilPreview::doDelete ( )

protected

Delete data from database.

Definition at line 367 of file class.ilPreview.php.

References getObjId().

Referenced by delete().

        {
                global $ilDB;
                
                $ilDB->manipulateF(
                    "DELETE FROM preview_data WHERE obj_id=%s",
                        array("integer"), 
                        array($this->getObjId()));              
        }

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ilPreview::doRead ( )

protected

Read data from database.

Definition at line 330 of file class.ilPreview.php.

References exists(), getObjId(), setRenderDate(), and setRenderStatus().

Referenced by init().

        {
                global $ilDB;
                
                $set = $ilDB->queryF(
                        "SELECT * FROM preview_data WHERE obj_id=%s", 
                        array("integer"), 
                        array($this->getObjId()));
                
                while ($rec = $ilDB->fetchAssoc($set))
                {
                        $this->setRenderDate($rec["render_date"]);
                        $this->setRenderStatus($rec["render_status"]);
                        $this->exists = true;
                }
        }

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ilPreview::doUpdate ( )

protected

Update data in database.

Definition at line 350 of file class.ilPreview.php.

References getObjId(), getRenderDate(), and getRenderStatus().

Referenced by save().

        {
                global $ilDB;
                
                $ilDB->update(
                        "preview_data", 
                        array(
                                "render_date" => array("timestamp", $this->getRenderDate()),
                                "render_status" => array("text", $this->getRenderStatus())
                        ),
                        array("obj_id" => array("integer", $this->getObjId()))
                );
        }

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ilPreview::exists ( )

Determines whether the preview exists or not.

Returns: bool true, if a preview exists for the object; otherwise, false.

Definition at line 181 of file class.ilPreview.php.

References $exists.

Referenced by delete(), doCreate(), doRead(), and save().

        {
                return $this->exists;           
        }

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ilPreview::getAbsoluteStoragePath ( )

Gets the absolute path where the previews are stored.

Returns: string The path where the previews are stored.

Definition at line 416 of file class.ilPreview.php.

References getStorage(), and ILIAS_ABSOLUTE_PATH.

Referenced by getFilePathFormat().

        {
                return ILIAS_ABSOLUTE_PATH . substr($this->getStorage()->getPath(), 1);
        }       

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ilPreview::getFilePathFormat ( )

Gets the absolute file path for preview images that contains a placeholder in the file name ('%02d') to be formatted with the preview number (use 'sprintf' for that).

Returns: string The format of the absolute file path.

Definition at line 427 of file class.ilPreview.php.

References $path, FILENAME_FORMAT, getAbsoluteStoragePath(), and ilUtil\removeTrailingPathSeparators().

        {
                $path = ilUtil::removeTrailingPathSeparators($this->getAbsoluteStoragePath());
                return $path . "/" . self::FILENAME_FORMAT;
        }

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ilPreview::getImages ( )

Gets an array of preview images.

Returns: array The preview images.

Definition at line 255 of file class.ilPreview.php.

References $file, $path, $size, ilUtil\getHtmlPath(), getRenderStatus(), and getStoragePath().

        {
                $images = array();
                
                // status must be created
                $path = $this->getStoragePath();
                if ($this->getRenderStatus() == self::RENDER_STATUS_CREATED)
                {
                        // load files
                        if ($handle = @opendir($path))
                        {
                                while (false !== ($file = readdir($handle)))
                                {
                                        $filepath = $path . "/" .  $file;
                                        if (!is_file($filepath)) 
                                                continue;
                                        if ($file != '.' && $file != '..' && strpos($file, "preview_") === 0)
                                        {
                                        $image = array();
                                                $image["url"] = ilUtil::getHtmlPath($filepath);
                                        
                                                // get image size
                                                $size = @getimagesize($filepath);
                                                if ($size !== false)
                                                {
                                                        $image["width"] = $size[0];
                                                        $image["height"] = $size[1];
                                                }
                                        
                                                $images[$file] = $image;
                                        }
                                }
                                closedir($handle);
                                
                                // sort by key
                                ksort($images);
                        }
                }               
                
                return $images;
        }

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ilPreview::getObjId ( )

Gets the id of the object the preview is for.

Returns: int The id of the object the preview is for.

Definition at line 382 of file class.ilPreview.php.

References $obj_id.

Referenced by doCreate(), doDelete(), doRead(), doUpdate(), and getObjType().

        {
                return $this->obj_id;
        }

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ilPreview::getObjType ( )

Gets the type of the object the preview is for.

Returns: string The type of the object the preview is for.

Definition at line 392 of file class.ilPreview.php.

References $obj_type, ilObject\_lookupType(), and getObjId().

        {
                // not evaluated before or specified?
                if (empty($this->obj_type))
                        $this->obj_type = ilObject::_lookupType($this->getObjId(), false);      
                return $this->obj_type;
        }

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ilPreview::getRenderDate ( )

Gets the date when the preview was rendered.

Returns: datetime The date when the preview was rendered.

Definition at line 438 of file class.ilPreview.php.

References $render_date.

Referenced by create(), doCreate(), and doUpdate().

        {
                return $this->render_date;
        }

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ilPreview::getRenderStatus ( )

Gets the status of the rendering process.

Returns: string The status of the rendering process.

Definition at line 458 of file class.ilPreview.php.

References $render_status.

Referenced by create(), doCreate(), doUpdate(), and getImages().

        {
                return $this->render_status;
        }

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ilPreview::getStorage ( )

Gets the storage object for the preview.

Returns: ilFSStoragePreview The storage object.

Definition at line 478 of file class.ilPreview.php.

References $storage.

Referenced by create(), delete(), getAbsoluteStoragePath(), and getStoragePath().

        {
                if ($this->storage == null)
                        $this->storage = new ilFSStoragePreview($this->obj_id);
                
                return $this->storage;
        }

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ilPreview::getStoragePath ( )

Gets the path where the previews are stored relative to the web directory.

Returns: string The path where the previews are stored.

Definition at line 406 of file class.ilPreview.php.

References getStorage().

Referenced by getImages().

        {
                return $this->getStorage()->getPath();
        }

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static ilPreview::hasPreview	(	$a_obj_id,
		$a_type = `""`
	)

static

Determines whether the object with the specified reference id has a preview.

Parameters

int	$a_obj_id	The id of the object to check.
string	$a_type	The type of the object to check.

Returns: bool true, if the object has a preview; otherwise, false.

Definition at line 149 of file class.ilPreview.php.

References $preview, ilRendererFactory\getRenderer(), and ilPreviewSettings\isPreviewEnabled().

Referenced by ilObjFileGUI\infoScreenForward(), and ilObjectListGUI\insertTitle().

        {
                if (!ilPreviewSettings::isPreviewEnabled())             
                        return false;
                
                $preview = new ilPreview($a_obj_id, $a_type);
                if ($preview->exists())
                        return true;
                
                // does not exist, enable on demand rendering if there's any renderer that supports our object
                require_once("./Services/Preview/classes/class.ilRendererFactory.php");
                $renderer = ilRendererFactory::getRenderer($preview);
                return $renderer != null;
        }

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ilPreview::init ( )

private

Initializes the preview object.

Definition at line 489 of file class.ilPreview.php.

References doRead().

Referenced by __construct().

        {
                // read entry
                $this->doRead();
        }

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static ilPreview::lookupRenderStatus ( $a_obj_id )

static

Gets the render status for the object with the specified id.

Parameters

int $a_obj_id The id of the object to get the status for.

Returns: string The status of the rendering process.

Definition at line 170 of file class.ilPreview.php.

References $preview.

Referenced by ilObjectListGUI\insertTitle().

        {
                $preview = new ilPreview($a_obj_id);
                return $preview->getRenderStatus();
        }

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ilPreview::save ( )

Saves the preview data to the database.

Definition at line 301 of file class.ilPreview.php.

References doCreate(), doUpdate(), and exists().

Referenced by create().

        {
                if ($this->exists)
                        $this->doUpdate();
                else
                        $this->doCreate();
        }

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ilPreview::setRenderDate ( $a_date )

Sets the date when the preview was rendered.

Parameters

datetime $a_status The date when the preview was rendered.

Definition at line 448 of file class.ilPreview.php.

Referenced by doRead().

        {
                $this->render_date = $a_date;
        }

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ilPreview::setRenderStatus ( $a_status )

Sets the status of the rendering process.

Parameters

string $a_status The status to set.

Definition at line 468 of file class.ilPreview.php.

Referenced by doRead().

        {
                $this->render_status = $a_status;
        }

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Field Documentation

ilPreview::$exists = false

private

Definition at line 49 of file class.ilPreview.php.

Referenced by exists().

ilPreview::$obj_id = null

private

Definition at line 31 of file class.ilPreview.php.

Referenced by getObjId().

ilPreview::$obj_type = null

private

Definition at line 37 of file class.ilPreview.php.

Referenced by getObjType().

ilPreview::$render_date = false

private

Definition at line 55 of file class.ilPreview.php.

Referenced by getRenderDate().

ilPreview::$render_status = self::RENDER_STATUS_NONE

private

Definition at line 61 of file class.ilPreview.php.

Referenced by getRenderStatus().

ilPreview::$storage = null

private

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

Referenced by getStorage().

const ilPreview::FILENAME_FORMAT = "preview_%02d.jpg"

Definition at line 25 of file class.ilPreview.php.

Referenced by getFilePathFormat().

const ilPreview::RENDER_STATUS_CREATED = "created"

Definition at line 22 of file class.ilPreview.php.

Referenced by ilPreviewGUI\getInlineHTML(), and ilPreviewRenderer\render().

const ilPreview::RENDER_STATUS_FAILED = "failed"

Definition at line 23 of file class.ilPreview.php.

Referenced by ilPreviewGUI\getInlineHTML(), ilPreviewGUI\getPreviewHTML(), and ilPreviewRenderer\render().

const ilPreview::RENDER_STATUS_NONE = "none"

Definition at line 20 of file class.ilPreview.php.

Referenced by delete(), ilPreviewGUI\getInlineHTML(), ilPreviewGUI\getJSCall(), and ilObjectListGUI\insertTitle().

const ilPreview::RENDER_STATUS_PENDING = "pending"

Definition at line 21 of file class.ilPreview.php.

Referenced by ilPreviewGUI\getPreviewHTML(), and ilPreviewRenderer\render().

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

Services/Preview/classes/class.ilPreview.php

Public Member Functions

Static Public Member Functions

Data Fields

Protected Member Functions

Private Member Functions

Private Attributes

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Field Documentation