public class ModifiedTemplate extends Template implements java.io.Serializable
last-modified
times
for content that is processed through templates.
For traditional web content that is stored in a file, it is easy to
keep track of the last time the content changed, simply by looking at the
modify-time attribute of the file. Many browsers (and caches) use
this information,
obtained from the last-modified
http header to determine
whether to use an existing copy of the document, or a cached copy.
When the content is dynamically transformed, however, the last modified time is more complex: a combination of the original file modification time combined with the last change made to the transformation parameters.
A new HTML tag,
<modified>
is defined, and is intended to be
used in conjunction with the BSLTemplate. When present in a
page, the last-modified
time of the transformation
is set to the server's current time. When the content is delivered
to the client, the last-modified
header is set to the
more recent of the origin last-modified time and the transformation
modified time.
Properties:
modified
tag is replaced by a comment. Otherwise it is removed from the document.
Constructor and Description |
---|
ModifiedTemplate() |
Modifier and Type | Method and Description |
---|---|
boolean |
done(RewriteContext hr)
Compute the http last modified value by comparing the origin
last-modified value (if any) with the transform value
|
void |
tag_modified(RewriteContext hr)
Set the content transformation modifiy time to NOW
|
public void tag_modified(RewriteContext hr)
public boolean done(RewriteContext hr)
done
in interface TemplateInterface
done
in class Template