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<h1>Asset Management</h1>
<div id="front-matter">
<div id="minitoc-area">
<ul class="minitoc">
<li>
<a href="#Introduction">Introduction</a>
</li>
<li>
<a href="#Asset+upload">Asset upload</a>
</li>
<li>
<a href="#Asset+insertion+%28via+%22enable+asset+upload%22+screen%29">Asset insertion (via "enable asset upload" screen)</a>
</li>
<li>
<a href="#Asset+insertion+%28via+Bitflux+editor%29">Asset insertion (via Bitflux editor)</a>
</li>
<li>
<a href="#Asset+removal">Asset removal</a>
</li>
<li>
<a href="#Involved+classes%2C+XSPs+and+XSLTs">Involved classes, XSPs and XSLTs</a>
</li>
</ul>
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</div>
<a name="N1000E"></a><a name="Introduction"></a>
<h2 class="h3">Introduction</h2>
<div class="section">
<p>Asset management is the process by which assets, such as pdf
files or images are uploaded to the server and inserted into a
document.</p>
<p>Assets can be either inserted directly into a document or can
be uploaded for later insertion. Direct insertion happens when
editing the document, upload and removal can be done in the
asset tab in the site area.</p>
</div>
<a name="N1001B"></a><a name="Asset+upload"></a>
<h2 class="h3">Asset upload</h2>
<div class="section">
<p>The upload of assets is done quite simply with a multipart
request. The Upload screen is generated by an xsp
(<span class="codefrag">asset.xsp</span>) which handles asset upload, image
upload, asset insertion and image insertion. This screen then
generates the multipart request which is eventually handled by
the <span class="codefrag">AssetUploadAction</span>. This action stores the asset
in the resources directory and generates a meta file with the
dublin core meta data that was passed in as request parameter or
with data that was extracted from the request (mime type,
size). Where the asset is stored is determined by the
<span class="codefrag">ResourcesManager</span>.</p>
</div>
<a name="N1002E"></a><a name="Asset+insertion+%28via+%22enable+asset+upload%22+screen%29"></a>
<h2 class="h3">Asset insertion (via "enable asset upload" screen)</h2>
<div class="section">
<p>Once the asset is uploaded, a reference to it has to be
inserted in the original document. Images and "plain" assets are
handled slighly different but the basic mechanism is the
same.</p>
<p>The insertion is done via an ant task
(<span class="codefrag">insert-asset</span>). This task generates a temporary
XSLT stylesheet using <span class="codefrag">generate-insertAsset-xsl.xsl</span>
as a meta stylesheet and an XML template which defines the XML
snippet that will be inserted in the refering document. The path
to the XML template is passed as a parameter to the ant
task. Usually these templates are located in
<span class="codefrag">config/asset</span>. The generated temporary stylesheet is
then applied to the document where the reference to the asset is
to be inserted. It will insert the appropriate XML snippet.</p>
</div>
<a name="N10044"></a><a name="Asset+insertion+%28via+Bitflux+editor%29"></a>
<h2 class="h3">Asset insertion (via Bitflux editor)</h2>
<div class="section">
<p>Images and assets can also be inserted from within the Bitflux editor.</p>
<p>The insertion is done via a XSLT stylesheet
(<span class="codefrag">image.xsl</span> or <span class="codefrag">asset.xsl</span> in <span class="codefrag">xslt/bxe</span>).
These stylesheets create a popup window that let the user select an asset or image
and insert it into the currently opened document via javascript.</p>
</div>
<a name="N1005A"></a><a name="Asset+removal"></a>
<h2 class="h3">Asset removal</h2>
<div class="section">
<p>Assets can be removed in the asset tab in the site area. This
removes the asset from the resources directory. It does not
however remove any references to it.</p>
<p>Removal is done with an ant task (<span class="codefrag">remove-asset</span>)
which simply deletes the asset from the resources directory.</p>
</div>
<a name="N1006A"></a><a name="Involved+classes%2C+XSPs+and+XSLTs"></a>
<h2 class="h3">Involved classes, XSPs and XSLTs</h2>
<div class="section">
<p>The following classes, XSPs and XSLTs are involved in the
asset upload:</p>
<dl>
<dt>src/webapp/lenya/content/authoring/asset.xsp, src/webapp/lenya/xslt/authoring/asset.xsl</dt>
<dd>Take care of displaying the proper asset upload
screen. There are different screens for image and asset upload
and for upload with or without subsequent insertion.</dd>
<dt>org.apache.lenya.cms.cocoon.acting.UploadAction</dt>
<dd>Handles the upload request, stores the asset in
<span class="codefrag">resources/authoring/$document-id/$resource-name</span>,
and creates a file containing the dublin core meta data for
the asset.</dd>
<dt>$publication-id/config/assets/*</dt>
<dd>Define the XML snippets that is to be inserted in lieu of a
refernce to an asset.</dd>
<dt>src/webapp/lenya/xslt/util/generate-insertAsset-xsl.xsl</dt>
<dd>The meta stylesheet which generates the XSLT the will
insert the proper XML snippet to link to the asset in the
refering document.</dd>
<dt>$publication-id/config/tasks/targets.xml</dt>
<dd>Defines the <span class="codefrag">insert-asset</span> target which handles
asset insertion. Also defines the <span class="codefrag">remove-asset</span>
target.</dd>
<dt>org.apache.lenya.cms.publication.ResourcesManager</dt>
<dd>Manages resources and hides away some of the iplementaion
details where resources and their meta data is stored.</dd>
</dl>
</div>
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