Package org.apache.wiki.providers

Class BasicAttachmentProvider

java.lang.Object

org.apache.wiki.providers.BasicAttachmentProvider

All Implemented Interfaces:

AttachmentProvider, WikiProvider

public class BasicAttachmentProvider
extends Object
implements AttachmentProvider

Provides basic, versioning attachments.

   Structure is as follows:
      attachment_dir/
         ThisPage/
            attachment.doc/
               attachment.properties
               1.doc
               2.doc
               3.doc
            picture.png/
               attachment.properties
               1.png
               2.png
         ThatPage/
            picture.png/
               attachment.properties
               1.png
             
  

The names of the directories will be URLencoded.

"attachment.properties" consists of the following items:

• 1.author = author name for version 1 (etc)

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	BasicAttachmentProvider.AttachmentFilter	Returns only those directories that contain attachments.
static class	BasicAttachmentProvider.AttachmentVersionFilter	Accepts only files that are actual versions, no control files.

Field Summary

Fields

Modifier and Type	Field	Description
static String	ATTDIR_EXTENSION	The default extension for the attachment directory.
static String	DIR_EXTENSION	The default extension for the page attachment directory name.
static String	PROP_DISABLECACHE	The property name for specifying which attachments are not cached.
static String	PROPERTY_FILE	The name of the property file.

Fields inherited from interface org.apache.wiki.api.providers.AttachmentProvider

PROP_STORAGEDIR

Fields inherited from interface org.apache.wiki.api.providers.WikiProvider

LATEST_VERSION

Constructor Summary

Constructors

Constructor	Description
BasicAttachmentProvider()

Method Summary

Modifier and Type	Method	Description
void	deleteAttachment(Attachment att)	Removes an entire page from the repository.
void	deleteVersion(Attachment att)	Removes a specific version from the repository.
Collection<Attachment>	findAttachments(QueryItem[] query)	Finds attachments based on the query.
InputStream	getAttachmentData(Attachment att)	Get attachment data.
Attachment	getAttachmentInfo(Page page, String name, int version)	Returns info about an attachment.
protected static String	getFileExtension(String filename)	Returns the file extension.
String	getProviderInfo()	Return a valid HTML string for information.
List<Attachment>	getVersionHistory(Attachment att)	Returns version history.
void	initialize(Engine engine, Properties properties)	Initializes the page provider.
List<Attachment>	listAllChanged(Date timestamp)	Lists changed attachments since given date.
List<Attachment>	listAttachments(Page page)	Lists all attachments attached to a page.
void	moveAttachmentsForPage(String oldParent, String newParent)	Move all the attachments for a given page so that they are attached to a new page.
void	putAttachmentData(Attachment att, InputStream data)	Put new attachment data.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

PROP_DISABLECACHE

public static final String PROP_DISABLECACHE

The property name for specifying which attachments are not cached. Value is "jspwiki.basicAttachmentProvider.disableCache".

See Also:

Constant Field Values

PROPERTY_FILE

public static final String PROPERTY_FILE

The name of the property file.

See Also:

Constant Field Values

DIR_EXTENSION

public static final String DIR_EXTENSION

The default extension for the page attachment directory name.

See Also:

Constant Field Values

ATTDIR_EXTENSION

public static final String ATTDIR_EXTENSION

The default extension for the attachment directory.

See Also:

Constant Field Values

Constructor Details

BasicAttachmentProvider

public BasicAttachmentProvider()

Method Details

initialize

public void initialize(Engine engine,
Properties properties)
                throws NoRequiredPropertyException,
IOException

Initializes the page provider.

Specified by:

initialize in interface WikiProvider

Parameters:

engine - Engine to own this provider

properties - A set of properties used to initialize this provider

Throws:

NoRequiredPropertyException - If the provider needs a property which is not found in the property set

IOException - If there is an IO problem

getFileExtension

protected static String getFileExtension(String filename)

Returns the file extension. For example "test.png" returns "png".

If file has no extension, will return "bin"

Parameters:

filename - The file name to check

Returns:

The extension. If no extension is found, returns "bin".

putAttachmentData

public void putAttachmentData(Attachment att,
InputStream data)
                       throws ProviderException,
IOException

Put new attachment data.

Specified by:

putAttachmentData in interface AttachmentProvider

Parameters:

att - Attachment object to add new data to

data - The stream from which the provider should read the data

Throws:

ProviderException - If there are other errors.

IOException - If writing fails

getProviderInfo

public String getProviderInfo()

Return a valid HTML string for information. May be anything.

Specified by:

getProviderInfo in interface WikiProvider

Returns:

A string describing the provider.

getAttachmentData

public InputStream getAttachmentData(Attachment att)
                              throws IOException,
ProviderException

Get attachment data.

Specified by:

getAttachmentData in interface AttachmentProvider

Parameters:

att - The attachment

Returns:

An InputStream which you contains the raw data of the object. It's your responsibility to close it.

Throws:

IOException - If the attachment cannot be opened

ProviderException - If the attachment cannot be found

listAttachments

public List<Attachment> listAttachments(Page page)
                                 throws ProviderException

Lists all attachments attached to a page.

Specified by:

listAttachments in interface AttachmentProvider

Parameters:

page - The page to list the attachments from.

Returns:

A collection of Attachment objects. May be empty, but never null.

Throws:

ProviderException - If something goes wrong when listing the attachments.

findAttachments

public Collection<Attachment> findAttachments(QueryItem[] query)

Finds attachments based on the query.

Specified by:

findAttachments in interface AttachmentProvider

Parameters:

query - An array of QueryItem objects to search for

Returns:

A Collection of Attachment objects. May be empty, but never null.

listAllChanged

public List<Attachment> listAllChanged(Date timestamp)
                                throws ProviderException

Lists changed attachments since given date. Can also be used to fetch a list of all pages.

This is different from WikiPageProvider, where you basically get a list of all pages, then sort them locally. However, since some providers can be more efficient in locating recently changed files (like any database) than our non-optimized Java code, it makes more sense to fetch the whole list this way.

To get all files, call this with Date(0L);

Specified by:

listAllChanged in interface AttachmentProvider

Parameters:

timestamp - List all files from this date onward.

Returns:

A List of Attachment objects, in most-recently-changed first order.

Throws:

ProviderException - If something goes wrong.

getAttachmentInfo

public Attachment getAttachmentInfo(Page page,
String name,
int version)
                             throws ProviderException

Returns info about an attachment.

Specified by:

getAttachmentInfo in interface AttachmentProvider

Parameters:

page - The parent page

name - The name of the attachment

version - The version of the attachment (it's okay to use WikiPage.LATEST_VERSION to find the latest one)

Returns:

An attachment object

Throws:

ProviderException - If the attachment cannot be found or some other error occurs.

getVersionHistory

public List<Attachment> getVersionHistory(Attachment att)

Returns version history. Each element should be an Attachment.

Specified by:

getVersionHistory in interface AttachmentProvider

Parameters:

att - The attachment for which to find the version history for.

Returns:

A List of Attachment objects.

deleteVersion

public void deleteVersion(Attachment att)
                   throws ProviderException

Removes a specific version from the repository. The implementations should really do no more security checks, since that is the domain of the AttachmentManager. Just delete it as efficiently as you can.

Specified by:

deleteVersion in interface AttachmentProvider

Parameters:

att - Attachment to be removed. The version field is checked, and thus only that version is removed.

Throws:

ProviderException - If the attachment cannot be removed for some reason.

deleteAttachment

public void deleteAttachment(Attachment att)
                      throws ProviderException

Removes an entire page from the repository. The implementations should really do no more security checks, since that is the domain of the AttachmentManager. Just delete it as efficiently as you can. You should also delete any auxiliary files and directories that belong to this attachment, IF they were created by this provider.

Specified by:

deleteAttachment in interface AttachmentProvider

Parameters:

att - Attachment to delete.

Throws:

ProviderException - If the page could not be removed for some reason.

moveAttachmentsForPage

public void moveAttachmentsForPage(String oldParent,
String newParent)
                            throws ProviderException

Move all the attachments for a given page so that they are attached to a new page.

Specified by:

moveAttachmentsForPage in interface AttachmentProvider

Parameters:

oldParent - Name of the page we are to move the attachments from.

newParent - Name of the page we are to move the attachments to.

Throws:

ProviderException - If the attachments could not be moved for some reason.