org.apache.wiki.attachment
Class DynamicAttachment

java.lang.Object
  org.apache.wiki.WikiPage
      org.apache.wiki.attachment.Attachment
          org.apache.wiki.attachment.DynamicAttachment

All Implemented Interfaces:

Cloneable, Comparable

public class DynamicAttachment
extends Attachment

A DynamicAttachment is an attachment which does not really exist, but is created dynamically by a JSPWiki component.

Note that a DynamicAttachment might not be available before it is actually created by a component (e.g. plugin), and therefore trying to access it before that component has been invoked, might result in a surprising 404.

DynamicAttachments are not listed among regular attachments in the current version.

Usage:

  class MyDynamicComponent implements DynamicAttachmentProvider
  {
  ...

     DynamicAttachment destatt = mgr.getDynamicAttachment( destattname );

     if( destatt == null )
     {
         destatt = new DynamicAttachment( context.getEngine(),
                                          context.getPage().getName(),
                                          destfilename,
                                          this );
         destatt.setCacheable( false );
     }

     // This is used to check whether the attachment is modified or not
     // so don't forget to update this if your attachment source changes!
     // Else JSPWiki will be serving 304s to anyone who asks...

     destatt.setLastModified( context.getPage().getLastModified() );
     mgr.storeDynamicAttachment( context,  destatt );
  ...

      public InputStream getAttachmentData( WikiContext context, Attachment att )
          throws IOException
      {
          byte[] bytes = "This is a test".getBytes();

          return new ByteArrayInputStream( bytes );
      }
  

Since:

2.5.34

Field Summary

Fields inherited from class org.apache.wiki.WikiPage

ALIAS, CHANGENOTE, DESCRIPTION, REDIRECT

Constructor Summary

DynamicAttachment(WikiEngine engine, String parentPage, String fileName, DynamicAttachmentProvider provider)
Creates a DynamicAttachment.

Method Summary

DynamicAttachmentProvider

getProvider() Returns the provider which is used to generate this attachment.

Methods inherited from class org.apache.wiki.attachment.Attachment

getFileName, getParentName, isCacheable, setCacheable, setFileName, toString

Methods inherited from class org.apache.wiki.WikiPage

clone, compareTo, getAcl, getAttribute, getAttributes, getAuthor, getLastModified, getName, getSize, getVersion, getWiki, hashCode, hasMetadata, invalidateMetadata, removeAttribute, setAcl, setAttribute, setAuthor, setHasMetadata, setLastModified, setSize, setVersion

Methods inherited from class java.lang.Object

equals, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

DynamicAttachment

public DynamicAttachment(WikiEngine engine,
                         String parentPage,
                         String fileName,
                         DynamicAttachmentProvider provider)

Creates a DynamicAttachment.

Parameters:

engine - The engine which owns this attachment

parentPage - The page which owns this attachment

fileName - The filename of the attachment

provider - The provider which will be used to generate the attachment.

Method Detail

getProvider

public DynamicAttachmentProvider getProvider()

Returns the provider which is used to generate this attachment.

Returns:

A Provider component for this attachment.