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» Performance
<a
target="_blank"
href="https://github.com/pmd/pmd/blob/master/docs/../pmd-xml/src/main/resources/category/xsl/performance.xml"
class="pull-right"
role="button"
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>
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<div class="post-header">
<h1 class="post-title-main">Performance</h1>
</div>
<div class="post-content" data-github-edit-url="https://github.com/pmd/pmd/blob/master/docs/../pmd-xml/src/main/resources/category/xsl/performance.xml">
<div class="summary">Rules that flag suboptimal code.</div>
<div id="inline-toc"><!-- empty, move TOC here when screen size too small --></div>
<!-- DO NOT EDIT THIS FILE. This file is generated from file ../pmd-xml/src/main/resources/category/xsl/performance.xml. -->
<h2 id="avoidaxisnavigation">AvoidAxisNavigation</h2>
<p><strong>Since:</strong> PMD 5.0</p>
<p><strong>Priority:</strong> Medium (3)</p>
<p>Avoid using the following or preceding axes whenever possible, as these can cut
through 100% of the document in the worst case. Also, try to avoid using descendant
or descendant-or-self axes, as if youre at the top of the Document, it necessarily means
cutting through 100% of the document.</p>
<p><strong>This rule is defined by the following XPath expression:</strong></p>
<div class="language-xpath highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="o">//</span><span class="kr">node()</span><span class="p">[</span><span class="w">
</span><span class="nf">contains</span><span class="p">(</span><span class="na">@select</span><span class="p">,</span><span class="s1">'preceding::'</span><span class="p">)</span><span class="w">
</span><span class="ow">or</span><span class="w">
</span><span class="nf">contains</span><span class="p">(</span><span class="na">@select</span><span class="p">,</span><span class="s1">'following::'</span><span class="p">)</span><span class="w">
</span><span class="ow">or</span><span class="w">
</span><span class="nf">contains</span><span class="p">(</span><span class="na">@select</span><span class="p">,</span><span class="s1">'descendant::'</span><span class="p">)</span><span class="w">
</span><span class="ow">or</span><span class="w">
</span><span class="nf">contains</span><span class="p">(</span><span class="na">@select</span><span class="p">,</span><span class="s1">'descendant-self::'</span><span class="p">)</span><span class="w">
</span><span class="ow">or</span><span class="w"> </span><span class="p">(</span><span class="w">
</span><span class="p">(</span><span class="nv">$checkSelfDescendantAbreviation</span><span class="w"> </span><span class="err">=</span><span class="w"> </span><span class="nf">true</span><span class="p">()</span><span class="w"> </span><span class="p">)</span><span class="w">
</span><span class="ow">and</span><span class="w">
</span><span class="nf">contains</span><span class="p">(</span><span class="na">@select</span><span class="p">,</span><span class="s1">'//'</span><span class="p">)</span><span class="w">
</span><span class="p">)</span><span class="w">
</span><span class="p">]</span><span class="w">
</span></code></pre></div></div>
<p><strong>Example(s):</strong></p>
<pre><code class="language-xsl">&lt;xsl:variable name="var" select="//item/descendant::child"/&gt;
</code></pre>
<p><strong>This rule has the following properties:</strong></p>
<table>
<thead>
<tr>
<th>Name</th>
<th>Default Value</th>
<th>Description</th>
<th>Multivalued</th>
</tr>
</thead>
<tbody>
<tr>
<td>checkSelfDescendantAbreviation</td>
<td>false</td>
<td>descendant::self abreviation, //, will also trigger this rule.</td>
<td>no</td>
</tr>
</tbody>
</table>
<p><strong>Use this rule with the default properties by just referencing it:</strong></p>
<div class="language-xml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nt">&lt;rule</span> <span class="na">ref=</span><span class="s">"category/xsl/performance.xml/AvoidAxisNavigation"</span> <span class="nt">/&gt;</span>
</code></pre></div></div>
<p><strong>Use this rule and customize it:</strong></p>
<div class="language-xml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nt">&lt;rule</span> <span class="na">ref=</span><span class="s">"category/xsl/performance.xml/AvoidAxisNavigation"</span><span class="nt">&gt;</span>
<span class="nt">&lt;properties&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"checkSelfDescendantAbreviation"</span> <span class="na">value=</span><span class="s">"false"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;/properties&gt;</span>
<span class="nt">&lt;/rule&gt;</span>
</code></pre></div></div>
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