forked from phoedos/pmd
2040 lines
49 KiB
HTML
2040 lines
49 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<meta name="description" content="Rules that flag suboptimal code.">
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<meta name="keywords" content=" Performance, AvoidAxisNavigation">
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<title>Performance | PMD Source Code Analyzer</title>
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<link rel="stylesheet" type="text/css" href="assets/fontawesome-free-5.15.4-web/css/all.min.css">
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<link rel="stylesheet" type="text/css" href="assets/bootstrap-4.5.2-dist/css/bootstrap.min.css">
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<link rel="stylesheet" type="text/css" href="css/syntax.css">
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<link rel="stylesheet" type="text/css" href="css/modern-business.css">
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<link rel="stylesheet" type="text/css" href="css/customstyles.css">
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<link rel="stylesheet" type="text/css" href="css/theme-green.css">
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<link rel="stylesheet" type="text/css" href="css/pmd-customstyles.css">
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<link rel="shortcut icon" href="images/logo/favicon.ico" type="image/x-icon">
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<link rel="icon" href="images/logo/favicon.ico" type="image/x-icon">
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<link rel="alternate" type="application/rss+xml" title="" href="feed.xml">
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</head>
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<body>
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<!-- Content is offset by the height of the topnav bar. -->
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<!-- There's already a padding-top rule in modern-business.css, but it apparently doesn't work on Firefox 60 and Chrome 67 -->
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<div id="topbar-content-offset">
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<!-- Navigation -->
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<nav class="navbar navbar-expand-lg fixed-top navbar-dark">
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<div class="container topnavlinks">
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<a class="navbar-brand fas fa-home fa-lg" href="index.html"> <span class="projectTitle"> PMD Source Code Analyzer Project</span></a>
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<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
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<span class="navbar-toggler-icon"></span>
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</button>
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<div class="collapse navbar-collapse" id="navbarSupportedContent">
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<ul class="navbar-nav mr-auto mt-2 mt-lg-0"></ul>
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<ul class="navbar-nav">
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<!-- toggle sidebar button -->
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<li class="nav-item"><a id="tg-sb-link" class="nav-link" href="#"><i id="tg-sb-icon" class="fas fa-toggle-on"></i> Nav</a></li>
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<!-- entries without drop-downs appear here -->
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<li class="nav-item"><a class="nav-link" href="https://github.com/pmd/pmd/releases/latest" target="_blank">Download</a></li>
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<li class="nav-item"><a class="nav-link" href="https://github.com/pmd/pmd" target="_blank">Fork us on github</a></li>
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<!-- entries with drop-downs appear here -->
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<!-- conditional logic to control which topnav appears for the audience defined in the configuration file.-->
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</ul>
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<form class="form-inline my-2 my-lg-0">
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<input class="form-control mr-sm-2" type="search" placeholder="search..." id="search-input">
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<ul id="results-container"></ul>
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</form>
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</div>
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</div>
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</nav>
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<!-- Page Content -->
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<div class="container-toc-wrapper">
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<div class="container">
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<div class="col-lg-12"> </div>
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<!-- Content Row -->
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<div class="row">
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<!-- Sidebar Column -->
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<div class="col-md-3" id="tg-sb-sidebar">
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<ul id="mysidebar" class="nav">
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<li class="sidebarTitle">PMD 7.8.0-SNAPSHOT</li>
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<div class="sidebarTitleDate">Release date: 29-November-2024</div>
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<li>
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<a href="#">About</a>
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<ul>
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<li><a href="index.html">Home</a></li>
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<li><a href="pmd_release_notes.html">Release notes</a></li>
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<li><a href="pmd_release_notes_pmd7.html">Release notes (PMD 7)</a></li>
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<li><a href="pmd_about_help.html">Getting help</a></li>
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<li><a href="pmd_about_release_policies.html">Release policies</a></li>
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<li><a href="pmd_about_support_lifecycle.html">Support lifecycle</a></li>
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</ul>
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</li>
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<li>
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<a href="#">User Documentation</a>
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<ul>
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<li><a href="pmd_userdocs_migrating_to_pmd7.html">Migration Guide for PMD 7</a></li>
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<li><a href="pmd_userdocs_installation.html">Installation and basic CLI usage</a></li>
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<li><a href="pmd_userdocs_making_rulesets.html">Making rulesets</a></li>
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<li><a href="pmd_userdocs_configuring_rules.html">Configuring rules</a></li>
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<li><a href="pmd_userdocs_best_practices.html">Best practices</a></li>
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<li><a href="pmd_userdocs_suppressing_warnings.html">Suppressing warnings</a></li>
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<li><a href="pmd_userdocs_incremental_analysis.html">Incremental analysis</a></li>
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<li><a href="pmd_userdocs_cli_reference.html">PMD CLI reference</a></li>
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<li><a href="pmd_userdocs_report_formats.html">PMD Report formats</a></li>
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<li><a href="pmd_userdocs_3rdpartyrulesets.html">3rd party rulesets</a></li>
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<li class="subfolders">
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<a href="#">CPD reference</a>
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<ul>
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<li><a href="pmd_userdocs_cpd.html">Copy-paste detection</a></li>
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<li><a href="pmd_userdocs_cpd_report_formats.html">CPD Report formats</a></li>
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</ul>
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</li>
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<li class="subfolders">
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<a href="#">Extending PMD</a>
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<ul>
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<li><a href="pmd_userdocs_extending_writing_rules_intro.html">Introduction to writing rules</a></li>
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<li><a href="pmd_userdocs_extending_your_first_rule.html">Your first rule</a></li>
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<li><a href="pmd_userdocs_extending_writing_xpath_rules.html">XPath rules</a></li>
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<li><a href="pmd_userdocs_extending_writing_java_rules.html">Java rules</a></li>
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<li><a href="pmd_userdocs_extending_designer_reference.html">Rule designer reference</a></li>
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<li><a href="pmd_userdocs_extending_defining_properties.html">Defining rule properties</a></li>
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<li><a href="pmd_userdocs_extending_rule_guidelines.html">Rule guidelines</a></li>
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<li><a href="pmd_userdocs_extending_testing.html">Testing your rules</a></li>
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<li><a href="pmd_userdocs_extending_ast_dump.html">Creating (XML) dump of the AST</a></li>
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</ul>
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</li>
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<li class="subfolders">
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<a href="#">Tools / Integrations</a>
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<ul>
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<li><a href="pmd_userdocs_tools_maven.html">Maven PMD Plugin</a></li>
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<li><a href="pmd_userdocs_tools_gradle.html">Gradle</a></li>
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<li><a href="pmd_userdocs_tools_ant.html">Ant</a></li>
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<li><a href="pmd_userdocs_tools_java_api.html">PMD Java API</a></li>
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<li><a href="pmd_userdocs_tools_bld.html">bld PMD Extension</a></li>
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<li><a href="pmd_userdocs_tools_ci.html">CI integrations</a></li>
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<li><a href="pmd_userdocs_tools.html">Other Tools / Integrations</a></li>
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</ul>
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</li>
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||
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||
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||
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</ul>
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</li>
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<li>
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<a href="#">Rule Reference</a>
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<ul>
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<li class="subfolders">
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<a href="#">Apex Rules</a>
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<ul>
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<li><a href="pmd_rules_apex.html">Index</a></li>
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<li><a href="pmd_rules_apex_bestpractices.html">Best Practices</a></li>
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<li><a href="pmd_rules_apex_codestyle.html">Code Style</a></li>
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<li><a href="pmd_rules_apex_design.html">Design</a></li>
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<li><a href="pmd_rules_apex_documentation.html">Documentation</a></li>
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<li><a href="pmd_rules_apex_errorprone.html">Error Prone</a></li>
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<li><a href="pmd_rules_apex_performance.html">Performance</a></li>
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<li><a href="pmd_rules_apex_security.html">Security</a></li>
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</ul>
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</li>
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<li class="subfolders">
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<a href="#">HTML Rules</a>
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<ul>
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<li><a href="pmd_rules_html.html">Index</a></li>
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<li><a href="pmd_rules_html_bestpractices.html">Best Practices</a></li>
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</ul>
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</li>
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<li class="subfolders">
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<a href="#">Java Rules</a>
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<ul>
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<li><a href="pmd_rules_java.html">Index</a></li>
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<li><a href="pmd_rules_java_bestpractices.html">Best Practices</a></li>
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||
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<li><a href="pmd_rules_java_codestyle.html">Code Style</a></li>
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<li><a href="pmd_rules_java_design.html">Design</a></li>
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<li><a href="pmd_rules_java_documentation.html">Documentation</a></li>
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<li><a href="pmd_rules_java_errorprone.html">Error Prone</a></li>
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||
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||
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||
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<li><a href="pmd_rules_java_multithreading.html">Multithreading</a></li>
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||
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||
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||
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<li><a href="pmd_rules_java_performance.html">Performance</a></li>
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||
|
||
|
||
|
||
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||
|
||
<li><a href="pmd_rules_java_security.html">Security</a></li>
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||
|
||
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||
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||
</ul>
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||
</li>
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||
|
||
|
||
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||
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||
|
||
|
||
|
||
<li class="subfolders">
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||
<a href="#">Java Server Pages Rules</a>
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||
<ul>
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||
|
||
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||
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||
<li><a href="pmd_rules_jsp.html">Index</a></li>
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||
|
||
|
||
|
||
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||
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||
<li><a href="pmd_rules_jsp_bestpractices.html">Best Practices</a></li>
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||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_jsp_codestyle.html">Code Style</a></li>
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||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_jsp_design.html">Design</a></li>
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||
|
||
|
||
|
||
|
||
|
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<li><a href="pmd_rules_jsp_errorprone.html">Error Prone</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_jsp_security.html">Security</a></li>
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||
|
||
|
||
|
||
</ul>
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||
</li>
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||
|
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|
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|
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|
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|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">JavaScript Rules</a>
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||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_ecmascript.html">Index</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_ecmascript_bestpractices.html">Best Practices</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_ecmascript_codestyle.html">Code Style</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_ecmascript_errorprone.html">Error Prone</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_ecmascript_performance.html">Performance</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
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|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">Kotlin Rules</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_kotlin.html">Index</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_kotlin_bestpractices.html">Best Practices</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_kotlin_errorprone.html">Error Prone</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
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||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">Maven POM Rules</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_pom.html">Index</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_pom_errorprone.html">Error Prone</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">Modelica Rules</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_modelica.html">Index</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_modelica_bestpractices.html">Best Practices</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">PLSQL Rules</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_plsql.html">Index</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_plsql_bestpractices.html">Best Practices</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_plsql_codestyle.html">Code Style</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_plsql_design.html">Design</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_plsql_errorprone.html">Error Prone</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">Salesforce Visualforce Rules</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_visualforce.html">Index</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_visualforce_security.html">Security</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">Scala Rules</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_scala.html">Index</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">Swift Rules</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_swift.html">Index</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_swift_bestpractices.html">Best Practices</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_swift_errorprone.html">Error Prone</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">Velocity Template Language (VTL) Rules</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_velocity.html">Index</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_velocity_bestpractices.html">Best Practices</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_velocity_design.html">Design</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_velocity_errorprone.html">Error Prone</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">WSDL Rules</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_wsdl.html">Index</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">XML Rules</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_xml.html">Index</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_xml_bestpractices.html">Best Practices</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_xml_errorprone.html">Error Prone</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">XSL Rules</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_xsl.html">Index</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_rules_xsl_codestyle.html">Code Style</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li class="active"><a href="pmd_rules_xsl_performance.html">Performance</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
<li>
|
||
|
||
<a href="#">Language-Specific Documentation</a>
|
||
|
||
<ul>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_index.html">Overview</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_configuration.html">Language configuration</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_apex.html">Apex</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_cpp.html">C/C++</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_cs.html">C#</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_coco.html">Coco</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_dart.html">Dart</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_fortran.html">Fortran</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_gherkin.html">Gherkin</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_go.html">Go</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_html.html">HTML</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_java.html">Java</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_js_ts.html">JavaScript / TypeScript</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_jsp.html">JSP</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_julia.html">Julia</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_kotlin.html">Kotlin</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_lua.html">Lua</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_matlab.html">Matlab</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_modelica.html">Modelica</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_objectivec.html">Objective-C</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_perl.html">Perl</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_php.html">PHP</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_plsql.html">PLSQL</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_python.html">Python</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_ruby.html">Ruby</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_scala.html">Scala</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_swift.html">Swift</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_tsql.html">T-SQL</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_visualforce.html">Visualforce</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_velocity.html">Velocity Template Language (VTL)</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_languages_xml.html">XML and XML dialects</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
<li>
|
||
|
||
<a href="#">Developer Documentation</a>
|
||
|
||
<ul>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_devdocs_development.html">Developer resources</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_devdocs_building.html">Building PMD from source</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="https://github.com/pmd/pmd/blob/main/CONTRIBUTING.md" target="_blank">Contributing</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_devdocs_writing_documentation.html">Writing documentation</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_devdocs_roadmap.html">Roadmap</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_devdocs_how_pmd_works.html">How PMD works</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_devdocs_pmdtester.html">Pmdtester</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_devdocs_rule_deprecation_policy.html">Rule Deprecation Policy</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">Major contributions</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_devdocs_major_rule_guidelines.html">Rule Guidelines</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_devdocs_major_adding_new_language_javacc.html">Adding a new language (JavaCC)</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_devdocs_major_adding_new_language_antlr.html">Adding a new language (ANTLR)</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_devdocs_major_adding_new_cpd_language.html">Adding a new CPD language</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">Experimental features</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="tag_experimental.html">List of experimental Features</a></li>
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
</ul>
|
||
</li>
|
||
|
||
|
||
|
||
<li>
|
||
|
||
<a href="#">Project documentation</a>
|
||
|
||
<ul>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<li class="subfolders">
|
||
<a href="#">Trivia about PMD</a>
|
||
<ul>
|
||
|
||
|
||
|
||
<li><a href="pmd_projectdocs_trivia_news.html">PMD in the press</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
<li><a href="pmd_projectdocs_trivia_products.html">Products & books related to PMD</a></li>
|
||
|
||
|
||
|
||
|
||
|
||
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<div class="col-lg-12">
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<a href="./" role="button"
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><i class="fa fa-home fa-lg"></i
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></a>
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» Performance
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<a
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target="_blank"
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href="https://github.com/pmd/pmd/blob/main/docs/../pmd-xml/src/main/resources/category/xsl/performance.xml"
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class="float-right"
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role="button"
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<hr />
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</header>
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<div class="post-header">
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<h1 class="post-title-main">Performance</h1>
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</div>
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<div class="post-content" data-github-edit-url="https://github.com/pmd/pmd/blob/main/docs/../pmd-xml/src/main/resources/category/xsl/performance.xml">
|
||
|
||
|
||
<div class="summary">Rules that flag suboptimal code.</div>
|
||
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<details id="inline-toc-details">
|
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<summary>Table of Contents</summary>
|
||
<div id="inline-toc"><!-- empty, move TOC here when screen size too small --></div>
|
||
</details>
|
||
|
||
<!-- 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 you’re 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"><xsl:variable name="var" select="//item/descendant::child"/>
|
||
</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>
|
||
</tr>
|
||
</thead>
|
||
<tbody>
|
||
<tr>
|
||
<td>checkSelfDescendantAbreviation</td>
|
||
<td>false</td>
|
||
<td>descendant::self abreviation, ‘//’, will also trigger this rule.</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"><rule</span> <span class="na">ref=</span><span class="s">"category/xsl/performance.xml/AvoidAxisNavigation"</span> <span class="nt">/></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"><rule</span> <span class="na">ref=</span><span class="s">"category/xsl/performance.xml/AvoidAxisNavigation"</span><span class="nt">></span>
|
||
<span class="nt"><properties></span>
|
||
<span class="nt"><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">/></span>
|
||
<span class="nt"></properties></span>
|
||
<span class="nt"></rule></span>
|
||
</code></pre></div></div>
|
||
|
||
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||
|
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This documentation is written in markdown. <br />
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If there is something missing or can be improved, edit this page on
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github and create a PR:
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<a
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target="_blank"
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href="https://github.com/pmd/pmd/blob/main/docs/../pmd-xml/src/main/resources/category/xsl/performance.xml"
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