sunlabs.brazil.template
Class ModifiedTemplate
java.lang.Object
sunlabs.brazil.template.Template
sunlabs.brazil.template.ModifiedTemplate
- All Implemented Interfaces:
- Serializable, TemplateInterface
public class ModifiedTemplate
- extends Template
- implements Serializable
Template class for computing 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:
- debug
- If this configuration parameter is present,
modified
tag is replaced by a comment. Otherwise it is removed from the document.
- Version:
- %V% 07/01/08
- Author:
- Stephen Uhler
- See Also:
- Serialized Form
Fields inherited from class sunlabs.brazil.template.Template |
debug |
Method Summary |
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 |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
ModifiedTemplate
public ModifiedTemplate()
tag_modified
public void tag_modified(RewriteContext hr)
- Set the content transformation modifiy time to NOW
done
public boolean done(RewriteContext hr)
- Compute the http last modified value by comparing the origin
last-modified value (if any) with the transform value
- Specified by:
done
in interface TemplateInterface
- Overrides:
done
in class Template