# FileCollection

interface FileCollection : Iterable<File> , AntBuilderAware, Buildable(source)

A `FileCollection` represents a collection of file system locations which you can query in certain ways. A file collection is can be used to define a classpath, or a set of source files, or to add files to an archive.

There are no methods on this interface that allow the contents of the collection to be modified. However, there are a number of sub-interfaces, such as ConfigurableFileCollection that allow changes to be made.

A file collection may contain task outputs. The file collection tracks not just a set of files, but also the tasks that produce those files. When a file collection is used as a task input property, Gradle will take care of automatically adding dependencies between the consuming task and the producing tasks.

You can obtain a `FileCollection` instance using files.

#### Inheritors

SourceSetOutput
ConfigurableFileCollection
FileTree
Configuration

## Types

AntType
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enum AntType
Ant types which a `FileCollection` can be mapped to.

## Functions

addToAntBuilder
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abstract fun addToAntBuilder(builder: Any, nodeName: String): Any
abstract fun addToAntBuilder(builder: Any, nodeName: String, type: FileCollection.AntType)
Adds this collection to an Ant task as a nested node.
contains
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abstract fun contains(file: File): Boolean
Determines whether this collection contains the given file.
filter
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abstract fun filter(filterClosure: Closure): FileCollection
abstract fun filter(filterSpec: Spec<in File>): FileCollection
Restricts the contents of this collection to those files which match the given criteria.
forEach
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open fun forEach(action: Consumer<in T>)
getAsFileTree
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abstract fun getAsFileTree(): FileTree
Converts this collection to a FileTree, if not already.
getAsPath
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abstract fun getAsPath(): String
Returns the contents of this collection as a platform-specific path.
getBuildDependencies
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abstract fun getBuildDependencies(): TaskDependency
Returns a dependency which contains the tasks which build this artifact.
getElements
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abstract fun getElements(): Provider<Set<FileSystemLocation>>
Returns the contents of this file collection as a Provider of FileSystemLocation instances.
getFiles
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abstract fun getFiles(): Set<File>
Returns the contents of this collection as a Set.
getSingleFile
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abstract fun getSingleFile(): File
Returns the content of this collection, asserting it contains exactly one file.
isEmpty
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abstract fun isEmpty(): Boolean
Returns true if this collection is empty.
iterator
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abstract fun iterator(): Iterator<T>
minus
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abstract fun minus(collection: FileCollection): FileCollection
Returns a `FileCollection` which contains the difference between this collection and the given collection.
plus
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abstract fun plus(collection: FileCollection): FileCollection
Returns a `FileCollection` which contains the union of this collection and the given collection.
spliterator
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open fun spliterator(): Spliterator<T>