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<title>MMetrics Task</title>
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<h2>MMetrics</h2>
<p>by</p>
<ul>
  <li>Stephane Bailliez (<a href="mailto:sbailliez@imediation.com">sbailliez@imediation.com</a>)</li>
</ul>
<h3>Requirements</h3>
<p>This task requires Metamata Development environment 2.0/Webgain Quality Analyzer 2.0.
An evaluation version is available at <a href="http://www.webgain.com/products/quality_analyzer">Webgain</a>.
(Though you will not be able to use Metrics from the command line if you do not have a registered version).
You also need a TRaX compliant processor(such as <a href="http://xml.apache.org/xalan-j">Xalan 2.x</a>) via JAXP 1.1</p>
<h3>Description</h3> 
<p>
  Invokes the Metamata Metrics / WebGain Quality Analyzer source code 
  analyzer on a set of Java files.
</p>
<p>
    <i>mmetrics</i> will compute the metrics of a set of Java files and write the results to an XML
    file. As a convenience, a stylesheet is given in <tt>etc</tt> directory, so that an HTML report can be generated from the XML file.
</p>

<h3>Parameters</h3>
<table border="1" cellpadding="2" cellspacing="0">
  <tr>
    <td valign="top"><b>Attribute</b></td>
    <td valign="top"><b>Description</b></td>
    <td align="center" valign="top"><b>Required</b></td>
  </tr>
  <tr>
    <td valign="top">metamatahome</td>
    <td valign="top">The home directory containing the Metamata distribution.</td>
    <td valign="top" align="center">Yes</td>
  </tr>
  <tr>
    <td valign="top">tofile</td>
    <td valign="top">The XML were the resulting metrics will be written to.</td>
    <td valign="top" align="center">Yes</td>
  </tr>
  <tr>
    <td valign="top">granularity</td>
    <td valign="top">Metrics granularity of the source files. Must be either
      <i>files</i> (compilation-units), <i>types</i> (types and compilation-units) or <i>methods</i>
      (methods, types and compilation-units).
    </td>
    <td valign="top" align="center">Yes</td>
  </tr>
  <tr>
    <td valign="top">maxmemory</td>
    <td valign="top">Set the maximum memory for the JVM. this is a convenient
      way to set the -mx or -Xmx argument.</td>
    <td valign="top" align="center">No</td>
  </tr>
</table>
<h3>Nested elements</h3>
For specifying the source code to analyze, you can either use a <tt>path</tt> or <tt>fileset</tt> elements (though a single path element is preferred, see note below).
<h4>jvmarg</h4>
<p>Additional parameters may be passed to the VM via nested <code>&lt;jvmarg&gt;</code>
attributes. <code>&lt;jvmarg&gt;</code> allows all attributes described in <a href="../using.html#arg">Command
line arguments</a>.</p>
<h4>classpath</h4>
<p>Sets class path (also source path unless one explicitly set). Overrides
METAPATH/CLASSPATH environment variables. The <tt>classpath</tt> element represents a <a href="../using.html#path">PATH like
structure</a>.</p>
<h4>sourcepath</h4>
<p>Sets source path. Overrides the SOURCEPATH environment variable. The <tt>sourcepath</tt> element represents a <a href="../using.html#path">PATH like
structure</a>.</p>

<h4>path</h4>
<p>Sets the list of directories to analyze the code for metrics.;It represents a <a href="../using.html#path">PATH structure</a>.</p>
<h4>fileset</h4>
<p>Sets a set of files to analyze for metrics.source  It represents a <a href="../CoreTypes/fileset.html">FILESET structure</a>.</p>

<p>
<font color="#FF0000">
Note: For the sake of readability, it is highly recommended to analyze for a single unique directory instead than
using filesets or several directories. Otherwise there will be multiple metrics outputs without any way to know
what metrics refers to what source. Chance are also that the XML handler that does some heuristic will be confused
by the different outputs.
</font>
</p>

<h3>Example</h3>
<pre>  &lt;mmetrics target=&quot;mmetrics.xml&quot;
          metamatahome=&quot;c:/metamata&quot;
          granularity=&quot;methods&quot;&gt;
    &lt;classpath&gt;
      &lt;pathelement location=&quot;c:/metamata/examples/metricsexamples&quot;/&gt;
    &lt;/classpath&gt;
    &lt;sourcepath&gt;
      &lt;pathelement location=&quot;c:/metamata/examples/metricsexamples&quot;/&gt;
    &lt;/sourcepath&gt;
    &lt;path&gt;
      &lt;pathelement location=&quot;c:/metamata/examples/metricsexamples&quot;/&gt;
    &lt;/path&gt;
  &lt;/mmetrics&gt;</pre>
<p>
  This invokes Metamata Metrics installed in <tt>c:/metamata</tt> on the metrics example.
  (Note that here, classpath and sourcepath are not normally not needed)
</p>

<h3>Generating a report</h3>
As a convenience, there is an XSL file(mmetrics-frames.xsl) that allows you to generate a full framed HTML report of the metrics.
You can find it in the <i>etc</i> directory of Ant. As it uses the Xalan extensions, you will need
BSF, Xalan and Xerces to run it. The stylesheet takes an <i>output.dir</i> parameter (otherwise it will be generated
in the current directory), it can be run in Ant as follows:
<pre>
&lt;java classname=&quot;org.apache.xalan.xslt.Process&quot;&gt;
    &lt;param value=&quot;-IN&quot;/&gt;
    &lt;param value=&quot;${metrics.xml}&quot;/&gt;
    &lt;param value=&quot;-XSL&quot;/&gt;
    &lt;param value=&quot;mmetrics-frames.xsl&quot;/&gt;
    &lt;param value=&quot;-PARAM&quot;/&gt;
    &lt;param value=&quot;output.dir&quot;/&gt;
    &lt;param value=&quot;&amp;quot;'${report.dir}'&amp;quot;&quot;/&gt;
&lt;/java&gt;
</pre>
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