Ah...Beautiful! Thank you for providing a working sample! Awesome!
But what if I wanted to perform check against values in cocoon.session,
cocoon.context or perhaps business logic? What I'm thinking of is to
intercept the request in sitemap.xmap like this:
<map:match pattern="time.jpg">
<map:call function="intercept"/>
</map:match>
Then I would have a flowscript function like this:
function intercept() {
// Session valid? Using cocoon.session to validate...
...
// Fetch some DB values if session valid...
var businessLogicObject = cocoon.getComponent("blBean");
...
// Etc..
// I know that user has a valid session, I've fetched values from
context (like language variables),
// performed a fetch towards DB and now I want to send everything needed
to generate a png-image
cocoon.sendPage("generate.image", {"background" : backgroundVariable,
"overlay" : overlayVariable});
}
The idea was to make a sitemap entry like this:
<map:match pattern="generate.image">
<map:read type="timeimg"/>
</map:match>
This utilizes the generator you wrote, but in this case I get an exception:
Pipeline has already been processed for this request. I've omitted
parameters, as you can see, for the time being.
Is there any simple solution to make use of a flowscript function to perform
logic and then use your reader with parameters?
Thomas Markus wrote:
>
> Hi,
>
> thats pretty simple. Create a reader like this (creates a png with
> current timestamp in red):
>
> public class TestImageReader extends AbstractReader {
>
> public String getMimeType() {
> return "image/png";
> }
>
> public void generate() throws IOException, SAXException,
> ProcessingException {
> String date = DateFormat.getDateTimeInstance().format(new
> Date());
> Font font = Font.decode(Font.SERIF).deriveFont(80.f);
> TextLayout textLayout = new TextLayout(date, font, new
> FontRenderContext(null, true, true));
> Rectangle2D bounds = textLayout.getBounds();
> BufferedImage image = new BufferedImage((int)
> bounds.getWidth(), (int) bounds.getHeight(), BufferedImage.TYPE_INT_ARGB);
> Graphics2D g = image.createGraphics();
> g.setColor(Color.RED);
> textLayout.draw(g, (float) -bounds.getX(), (float)
> -bounds.getY());
> g.dispose();
> ImageIO.write(image, "png", this.out);
> }
>
> }
>
> in your sitemap define and use this reader:
> <map:components>
> <map:readers>
> <map:reader name="timeimg" src="test.TestImageReader" />
> </map:readers>
> </map:components>
>
> ...
>
> <map:match pattern="time.jpg">
> <map:read type="timeimg" />
> </map:match>
>
>
> hth
> Thomas
>
>
> Am 21.05.2011 14:00, schrieb JeVeoy:
>>
>> First of all: thank you so much for helping me out, Steven& Thomas!
>>
>> Then: I've tried my best to see if I could get a working example to run
>> using either javax.imageio.ImageIO.write(RenderedImage, String,
>> OutputStream) or AbstractReader.out, but to no luck. Googling didn't
>> quite
>> help either. I'm very sorry for my lack of knowledge... Hope you can
>> forgive
>> me.
>>
>> Pipeline for an image-reader is, as far as I know, defined in
>> sitemap.xmap
>> like this:
>>
>> <map:match pattern="*.jpg">
>> <map:read type="image" src="path/{1}.png" mime-type="image/png">
>> </map:read>
>> </map:match>
>>
>> How can I make use of AbstractReader.out in this definition?
>
>
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