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56 lines
1.5 KiB
Markdown
56 lines
1.5 KiB
Markdown
---
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title: PSI Cookbook
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---
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This page gives a list of recipes for the most common operations for working with the PSI (Program Structure Interface). Unlike [Developing Custom Language Plugins](/reference_guide/custom_language_support.md), it talks about working with the PSI of existing languages (such as Java).
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> **TIP** Please see also [Working with PSI efficiently](/reference_guide/performance/performance.md#working-with-psi-efficiently).
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### How do I find a file if I know its name but don't know the path?
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`FilenameIndex.getFilesByName()`
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### How do I find where a particular PSI element is used?
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`ReferencesSearch.search()`
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### How do I rename a PSI element?
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`RefactoringFactory.createRename()`
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### How can I cause the PSI for a virtual file to be rebuilt?
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`FileContentUtil.reparseFiles()`
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## Java Specific
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### How do I find all inheritors of a class?
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`ClassInheritorsSearch.search()`
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### How do I find a class by qualified name?
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`JavaPsiFacade.findClass()`
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### How do I find a class by short name?
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`PsiShortNamesCache.getInstance().getClassesByName()`
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### How do I find a superclass of a Java class?
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`PsiClass.getSuperClass()`
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### How do I get a reference to the containing package of a Java class?
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```java
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PsiJavaFile javaFile = (PsiJavaFile) psiClass.getContainingFile();
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PsiPackage pkg = JavaPsiFacade.getInstance(project).findPackage(javaFile.getPackageName());
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```
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or
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`com.intellij.psi.util.PsiUtil.getPackageName()`
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### How do I find the methods overriding a specific method?
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`OverridingMethodsSearch.search()`
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