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<h1>URI Parametrizer</h1>
<div id="front-matter">
<div class="abstract">Desciption of the URI Parametrizer which is a key
element of the site tree framework.</div>
<div id="minitoc-area">
<ul class="minitoc">
<li>
<a href="#Motivation">Motivation</a>
</li>
<li>
<a href="#Rationale">Rationale</a>
<ul class="minitoc">
<li>
<a href="#Overview">Overview</a>
</li>
<li>
<a href="#Interfaces">Interfaces</a>
</li>
</ul>
</li>
</ul>
</div>
</div>
<a name="N10018"></a><a name="Motivation"></a>
<h2 class="h3">Motivation</h2>
<div class="section">
<p>The problem of <a href="../publication/siteTree.html">determining the doctype</a>
independent of request URI needs a flexible and yet simple
solution. This is where the URI Parametrizer comes to the
rescue.</p>
</div>
<a name="N10026"></a><a name="Rationale"></a>
<h2 class="h3">Rationale</h2>
<div class="section">
<p>The URI Parametrizer is an action which given an arbitrary
URI return a configurable number of parameters which it infers
from this URI. Typical parameters include source document type,
navigation location, etc. The action itself delegates to task of
determining the parameters to the Cocoon sitemap, i.e. the
parameters are determinined using the normal sitemap pipeline
matching mechanism.</p>
<a name="N1002F"></a><a name="Overview"></a>
<h3 class="h4">Overview</h3>
<p>The flow of information is outlined in the following
diagram:</p>
<div id="" style="text-align: center;">
<img id="" class="figure" alt="Diagram of URIParametrizer" src="../../../../images/URIParametrizer.png"></div>
<a name="N1003D"></a><a name="Interfaces"></a>
<h3 class="h4">Interfaces</h3>
<p>The URIParametrizerAction expects an arbitrary number of
parameters. Each parameter contains a key value pair which
denotes the name of the parameter and the source. A typical
example is as follows:</p>
<pre class="code">
&lt;map:act type="uriparametrizer"&gt;
&lt;map:parameter name="doctype"
value="cocoon://uri-parameter/{publication-id}/doctype"/&gt;
&lt;map:parameter name="path"
value="cocoon://uri-parameter/{publication-id}/path"/&gt;
&lt;map:generate src="cocoon:/{doctype}/{path}"/&gt;
&lt;/map:act&gt;
</pre>
<p>The <span class="codefrag">uri-parameter</span> prefix is a standard prefix
which invokes a pipeline in the root sitemap which mounts a
subsitemap in your publication with the name
<span class="codefrag">parameter-{parameterName}.xmap</span>.</p>
<p>The action basically just issues a request back to cocoon
for each parameter. It uses the URI given in the value
attribute where it also adds the original request URI. So for
a given request URI <span class="codefrag">foo.html</span> and the parameters
given above the action basically issues to requests using the
<span class="codefrag">cocoon:</span> protocol:</p>
<pre class="code">
cocoon://uri-parameter/{publication-id}/doctype/foo.html
cocoon://uri-parameter/{publication-id}/path/foo.html</pre>
<p>The matcher for uri-parameter in the root sitemap then
tries to mount the sitemaps
<span class="codefrag">parameter-doctype.xmap</span> and
<span class="codefrag">parameter-path.xmap</span> in the publication. Then the
reuest is matched against the parameter sitemap. Here's a very
simple example of a parameter sitemap:</p>
<pre class="code">
&lt;?xml version="1.0"?&gt;
&lt;map:sitemap xmlns:map="http://apache.org/cocoon/sitemap/1.0"&gt;
&lt;map:components&gt;
&lt;map:generators default="file"/&gt;
&lt;map:transformers default="xslt"/&gt;
&lt;map:readers default="resource"/&gt;
&lt;map:serializers default="html"/&gt;
&lt;map:matchers default="wildcard"/&gt;
&lt;map:actions/&gt;
&lt;/map:components&gt;
&lt;map:views/&gt;
&lt;map:resources/&gt;
&lt;map:pipelines&gt;
&lt;map:pipeline&gt;
&lt;map:match pattern="**"&gt;
&lt;map:generate type="serverpages" src="content/parameters/doctype.xsp"&gt;
&lt;map:parameter name="value" value="{1}"/&gt;
&lt;/map:generate&gt;
&lt;map:serialize type="xml"/&gt;
&lt;/map:match&gt;
&lt;/map:pipeline&gt;
&lt;/map:pipelines&gt;
&lt;/map:sitemap&gt;</pre>
<p>A more serious example could possibly include matchers
using the SourceTypeAction from the Forrest Project or a
HashMapAction as outlined in the <a href="../publication/siteTree.html">SiteTree proposal</a>.</p>
<p>After a match has been found the pipeline in the parameter
sitemap returns an XML snippet in the following form:</p>
<pre class="code">
&lt;?xml version="1.0" encoding="ISO-8859-1"?&gt;
&lt;parameter xmlns="http://apache.org/cocoon/lenya/uri-parameters/1.0"&gt;article&lt;/parameter&gt;
</pre>
<p>This xml is consequently parsed by the action and returned
as a HashMap. Inside the action the parameters will be
available under the names as they were specified in the
parameters to the action.</p>
<p>The fact that the actual determination is delegated back to
the sitemap allows for a combination of the <a href="../publication/siteTree.html">original proposals</a> where
solutions such as Hashmap and SourceTypeAction were
outlined.</p>
</div>
<span class="version">
v0.1Initial version</span>
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