#foreach --> new File

[Jesper Linvald <je...@kabelnettet.dk>]

Hello Gurus,

I would like to be able to do like the following :

#foreach($entity in $model.get_entities())
	#set( $entityName = $entity.get_name() )

$writer.changeOutput("${entityName}.java")

public class $entityName{
...
}
#end

That is:
During iteration in a template I would like to be able to direct the
output to a specific file!

Do you have any tricks or suggestions as how do that ? I realize that I
could have my iteration in a Java file and supply a new writer whenever
I want – but this is not what I want.

The writer on which I call changeOutput(fileName) is homebrew but is
only able to create the new files in the loop – not to actually write to
them!

I suspect that Velocity might wrap the writer that you supply but what
can be done to control the output ?

Any suggestion is more than welcome!

Thank you :)esper

I append my Writer class aswell:

package dk.itu.next.rea.transform.velocity;

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Writer;

public class VelocityContextWriter extends Writer {
	
	private Writer writer;
	private String fileName="dummy.java";

//----------- NEW METHODS --------------------------

public void changeOutput(String fileName){
	this.fileName = fileName;
	try {

		flush();
		close();
	
		writer = new FileWriter(fileName);
	}
	catch (IOException e) {
		e.printStackTrace();
	}
}
	public VelocityContextWriter() {
		super();
		try {
			writer = new FileWriter(fileName);
		}
		catch (IOException e) {
			e.printStackTrace();
		}
		
	}

// ---------- WRITER METHODS ----------------------
	public VelocityContextWriter(Object lock) {
		super(lock);
	}

	public void write(char[] cbuf, int off, int len) throws
IOException {
		if(writer != null)
			writer.write(cbuf, off, len);
	}

	public void flush() throws IOException {
		writer.flush();
	}

	public void close() throws IOException {
		writer.close();
	}
}


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Re: #foreach --> new File

[Claude Brisson <cl...@savoirweb.com>]

>From what I saw, the principle looks dirty but ok...

> I suspect that Velocity might wrap the writer that you supply but what
> can be done to control the output ?

Velocity doesn't do such a wrapping, it should be ok (since dirty)... provided you call directly the Template.merge(Context,Writer)
method.

Try to add some debugging to your writer to understand what happens, like write a dummy line in the file from the changeOutput
method...

Do you have free space on your hard drive ? ;-)

CloD




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