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From Carl Buxbaum <cbuxb...@bamboorose.com>
Subject question about empty images embedded into FOP generated PDF
Date Mon, 20 Nov 2017 20:44:05 GMT

Hello,

In some of our reports we have entities that attempt to embed an empty image.  That is, we
blindly try to attach an image when the reference to the image is empty.  This results in
a tortuously slow “ls” of the file store.

This is what we normally try to do:

<fo:block text-align="center">
<xsl:variable name="image2">
<xsl:value-of select="attachment/@location" />
</xsl:variable>
<fo:external-graphic src="{$image2}"
content-width="350px" content-height="350px" />
</fo:block>

We have an awkward workaround of always testing for a non-empty @location, or we instruct
the user to to modify file permissions to wx instead of rwx.

I was wondering if it would make sense in the FOP code, in ExternalGraphic.java bind method:


 /** {@inheritDoc} */

    public void bind(PropertyList pList) throws FOPException {

        super.bind(pList);

        src = pList.get(PR_SRC).getString();


        //Additional processing: obtain the image's intrinsic size and baseline information

        url = URISpecification.getURL(src);

        FOUserAgent userAgent = getUserAgent();

        ImageManager manager = userAgent.getImageManager();

        ImageInfo info = null;

        try {

            info = manager.getImageInfo(url, userAgent.getImageSessionContext());

        } catch (ImageException e) {

            ResourceEventProducer eventProducer = ResourceEventProducer.Provider.get(

                    getUserAgent().getEventBroadcaster());

            eventProducer.imageError(this, url, e, getLocator());

        } catch (FileNotFoundException fnfe) {

            ResourceEventProducer eventProducer = ResourceEventProducer.Provider.get(

                    getUserAgent().getEventBroadcaster());

            eventProducer.imageNotFound(this, url, fnfe, getLocator());

        } catch (IOException ioe) {

            ResourceEventProducer eventProducer = ResourceEventProducer.Provider.get(

                    getUserAgent().getEventBroadcaster());

            eventProducer.imageIOError(this, url, ioe, getLocator());

        }

        if (info != null) {

            this.intrinsicWidth = info.getSize().getWidthMpt();

            this.intrinsicHeight = info.getSize().getHeightMpt();

            int baseline = info.getSize().getBaselinePositionFromBottom();

            if (baseline != 0) {

                this.intrinsicAlignmentAdjust

                    = FixedLength.getInstance(-baseline);

            }

        }

    }


to check for a URL that ends with the file separator or URL forward slash, and just return
a FileNotFoundException in that case?  Is there any use case that this would disrupt?  We
have users who have millions of images in their file store, and every time we run into one
of these calls it consumes needless seconds or minutes of processing time until they are told
that there is no Image Processor for <blank>.


Thanks,


Carl

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