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2011-09-22T10:50:07.060
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Try the 'Write a rule using Java' method as you can easily start this way and later you can try with XPath expressions. You can follow these steps alongside the official <a href="http://pmd.sourceforge.net/howtowritearule.html" rel="nofollow">link</a>. <ul> <li>Start with the src package that comes with PMD (e.g. pmd-4.2.x\src), create your java class inside an existing package (e.g. pmd-4.2.5\src\net\sourceforge\pmd\rules\basic). In this case it is the following sample code (WhileLoopsMustUseBracesRule) :</li> </ul> <pre><code> package net.sourceforge.pmd.rules.basic; import net.sourceforge.pmd.*; import net.sourceforge.pmd.ast.*; public class WhileLoopsMustUseBracesRule extends AbstractRule { public Object visit(ASTWhileStatement node, Object data) { SimpleNode firstStmt = (SimpleNode)node.jjtGetChild(1); if (!hasBlockAsFirstChild(firstStmt)) { addViolation(data, node); } return super.visit(node,data); } private boolean hasBlockAsFirstChild(SimpleNode node) { return (node.jjtGetNumChildren() != 0 && (node.jjtGetChild(0) instanceof ASTBlock)); } } </code></pre> <ul> <li>Append the following rule inside basic.xml(pmd-4.2.5\rulesets\basic.xml) : Copy paste the xml content from "Put the WhileLoopsMustUseBracesRule rule in a ruleset file" section to basic.xml. Replace the line <pre><code>class="WhileLoopsMustUseBracesRule"> </code></pre> with <pre><code>class="net.sourceforge.pmd.rules.basic.WhileLoopsMustUseBracesRule"> </code></pre> as you must have created the java file (WhileLoopsMustUseBracesRule.java) inside package "net.sourceforge.pmd.rules.basic"</li> <li>Run this command from cmd prompt if in windows.</li> </ul> <pre><code> pmd.bat C:\JAVAFILE_ON_WHICH_YOU_WANT_TO_RUN_THIS_RULE xml C:\PMD\pmd-4.2.5\pmd-4.2.5\rulesets\basic.xml </code></pre> <ul> <li>For the nix os (linux/MacOS), use pmd.sh instead of pmd.bat</li> <li>Once you are able to get it running, you can create your own rule inside your own package.</li> </ul> Hope this helps.!
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