Write to multiple files, controlled by template directives
----------------------------------------------------------
Key: VELOCITY-787
URL: https://issues.apache.org/jira/browse/VELOCITY-787
Project: Velocity
Issue Type: New Feature
Components: Engine
Affects Versions: 2.0
Environment: All environments
Reporter: Don Mendelson
For some purposes, such as code generation, it would be very desirable to
output to multiple files from the same context. For example, to generate code
for a C++ class, two files must be generated - a header and implementation
file. Rendering could be driven by the same context in both cases, which would
desribe the class name, method signatures, etc. Currently this must be done by
running the engine twice - once with a header template and again with an
implementation file template.
Furthermore, it would desirable to determine the output file names during
rendering, based on a combination of template directives and data in the
context. To use the code generation example, the header and implementation file
names would be determined by the name of the class to be generated.
This is not possible with the current method signature of Directive:
public boolean render(InternalContextAdapter context, Writer writer, Node
node)
An output directive would want to change the writer to a different instance of
FileWriter, for instance. But since Java passes object references by value, the
writer object cannot be replaced.
The proposal is to provide a method to install a new instance of Writer during
rendering of a template. This would support both writing multiple outputs in
one run of the engine as well as controlling the file names of the outputs.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
