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    <p>The rename refactoring has several processors that subclass <a href="http://grepcode.com/file/repository.grepcode.com/java/eclipse.org/3.6.1/org.eclipse.ltk.core/refactoring/3.5.100/org/eclipse/ltk/core/refactoring/participants/RenameProcessor.java#RenameProcessor" rel="noreferrer"><code>org.eclipse.ltk.core.refactoring.participants.RenameProcessor</code></a> and are responsible for renaming different elements. For example, there is a processor for renaming Java projects <a href="http://grepcode.com/file/repository.grepcode.com/java/eclipse.org/3.6.1/org.eclipse.jdt/ui/3.6.1/org/eclipse/jdt/internal/corext/refactoring/rename/RenameJavaProjectProcessor.java#RenameJavaProjectProcessor" rel="noreferrer"><code>org.eclipse.jdt.internal.corext.refactoring.rename.RenameJavaProjectProcessor</code></a>. A refactoring participant can participate in the condition checking and change creation of a refactoring processor. For example, to check some conditions during a rename refactoring, you should subclass <a href="http://grepcode.com/file/repository.grepcode.com/java/eclipse.org/3.6.1/org.eclipse.ltk.core/refactoring/3.5.100/org/eclipse/ltk/core/refactoring/participants/RenameParticipant.java#RenameParticipant" rel="noreferrer"><code>org.eclipse.ltk.core.refactoring.participants.RenameParticipant</code></a>, override the method <a href="http://grepcode.com/file/repository.grepcode.com/java/eclipse.org/3.6.1/org.eclipse.ltk.core/refactoring/3.5.100/org/eclipse/ltk/core/refactoring/participants/RefactoringParticipant.java#RefactoringParticipant.checkConditions%28org.eclipse.core.runtime.IProgressMonitor,org.eclipse.ltk.core.refactoring.participants.CheckConditionsContext%29" rel="noreferrer"><code>org.eclipse.ltk.core.refactoring.participants.RefactoringParticipant.checkConditions(IProgressMonitor, CheckConditionsContext)</code></a> and register the participant via the extension point <code>org.eclipse.ltk.core.refactoring.renameParticipants</code>. The participant <a href="http://grepcode.com/file/repository.grepcode.com/java/eclipse.org/3.6.1/org.eclipse.jdt/ui/3.6.1/org/eclipse/jdt/internal/corext/refactoring/nls/NLSAccessorFieldRenameParticipant.java#NLSAccessorFieldRenameParticipant" rel="noreferrer"><code>org.eclipse.jdt.internal.corext.refactoring.nls.NLSAccessorFieldRenameParticipant</code></a> gives you a good example of how to participate in a rename refactoring.</p> <p>When you declare your extension of the <code>org.eclipse.ltk.core.refactoring.renameParticipants</code> extension point, you should specify the element you'd like your participant to get notified about. For example, see how the following use of the <code>org.eclipse.ltk.core.refactoring.renameParticipants</code> extension point in <a href="http://grepcode.com/file/repository.grepcode.com/java/eclipse.org/3.6.1/org.eclipse.jdt/ui/3.6.1/plugin.xml/?v=source" rel="noreferrer"><code>org.eclipse.jdt.ui/plugin.xml</code></a> involves the participant in renaming fields.</p> <pre><code>&lt;extension point="org.eclipse.ltk.core.refactoring.renameParticipants"&gt; &lt;renameParticipant class="org.eclipse.jdt.internal.corext.refactoring.nls.NLSAccessorFieldRenameParticipant" id="org.eclipse.jdt.ui.NLSFieldRenameParticipant" name="%Refactoring.NLSFieldRenameParticipant"&gt; &lt;enablement&gt; &lt;with variable="affectedNatures"&gt; &lt;iterate operator="or"&gt; &lt;equals value="org.eclipse.jdt.core.javanature"/&gt; &lt;/iterate&gt; &lt;/with&gt; &lt;with variable="element"&gt; &lt;instanceof value="org.eclipse.jdt.core.IField"/&gt; &lt;/with&gt; &lt;/enablement&gt; &lt;/renameParticipant&gt; &lt;/extension&gt; </code></pre>
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    1. COHi, Thanks for your reply. I subclassed RenameParticipant. Overrid method checkConditions. And registered the participant via extension point. Now it does validation for everything(ie for projects, files etc). I want validation only for project name. I didnt understand where I can place the RenameJavaProjectProcessor. Thanks,
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    2. CO`RenameJavaProjectProcessor` is in JDT and you don't have to worry about it. You just need to specify the element your participant works on when you declare your extension point in `plugin.xml`. See my updated answer on how to specify the element on which your participant operates.
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    3. COThanks! It worked now.
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