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39 lines
1.9 KiB
Markdown
39 lines
1.9 KiB
Markdown
---
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title: Module
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---
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A module is a discrete unit of functionality that can be run, tested, and debugged independently.
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Modules includes such things as source code, build scripts, unit tests, deployment descriptors, etc.
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In the project, each module can use a specific SDK or inherit SDK defined on the project level (see the [SDK](/reference_guide/project_model/sdk.html) section later in this document).
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A module can depend on other modules of the project.
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## Getting Current Module
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To determine a module in the project in question to which the specified virtual file belongs, use the
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ProjectFileIndex.getModuleForFile(virtualFile) method:
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```java
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Module module = ProjectRootManager.getInstance(project).getFileIndex().getModuleForFile(virtualFile);
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```
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## Accessing Module Roots
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Information about module roots can be accessed via the class
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[ModuleRootManager.java](https://github.com/JetBrains/intellij-community/blob/master/platform/projectModel-api/src/com/intellij/openapi/roots/ModuleRootManager.java),
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for example, an instance of
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[ModuleFileIndex.java](https://github.com/JetBrains/intellij-community/blob/master/platform/projectModel-api/src/com/intellij/openapi/roots/ModuleFileIndex.java)
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can be obtained, which is analogical to the
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[ProjectFileIndex.java](https://github.com/JetBrains/intellij-community/blob/master/platform/projectModel-api/src/com/intellij/openapi/roots/ProjectFileIndex.java)
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but in the scope of a module
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```java
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ModuleRootManager.getInstance(currentModule).getFileIndex()
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```
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### Checking Belonging to a Module Source Root
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To check if a virtual file or directory belongs to a module source root, use the `ProjectFileIndex.getSourceRootForFile` method.
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This method returns null if the file or directory does not belong to any source root of modules in the project.
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```java
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VirtualFile moduleSourceRoot = ProjectRootManager.getInstance(project).getFileIndex().getSourceRootForFile(virtualFileOrDirectory);
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```
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