Package Summary Overview Summary

### class:FileStore [NONE]
-     public abstract class FileStore
      extends Object
Storage for files. A `FileStore` represents a storage pool, device, partition, volume, concrete file system or other implementation specific means of file storage. The `FileStore` for where a file is stored is obtained by invoking the `getFileStore` method, or all file stores can be enumerated by invoking the `getFileStores` method. In addition to the methods defined by this class, a file store may support one or more `FileStoreAttributeView` classes that provide a read-only or updatable view of a set of file store attributes. Since: 1.7

### constructor:FileStore() [NONE]
- #### FileStore
      protected FileStore()
Initializes a new instance of this class.

### method:name() [NONE]
- #### name
      public abstract String name()
Returns the name of this file store. The format of the name is highly implementation specific. It will typically be the name of the storage pool or volume. The string returned by this method may differ from the string returned by the `toString` method. Returns: the name of this file store

### method:type() [NONE]
- #### type
      public abstract String type()
Returns the type of this file store. The format of the string returned by this method is highly implementation specific. It may indicate, for example, the format used or if the file store is local or remote. Returns: a string representing the type of this file store

### method:isReadOnly() [NONE]
- #### isReadOnly
      public abstract boolean isReadOnly()
Tells whether this file store is read-only. A file store is read-only if it does not support write operations or other changes to files. Any attempt to create a file, open an existing file for writing etc. causes an `IOException` to be thrown. Returns: `true` if, and only if, this file store is read-only

### method:getTotalSpace() [NONE]
- #### getTotalSpace
      public abstract long getTotalSpace()
                                  throws IOException
Returns the size, in bytes, of the file store. Returns: the size of the file store, in bytes Throws: `IOException` - if an I/O error occurs

### method:getUsableSpace() [NONE]
- #### getUsableSpace
      public abstract long getUsableSpace()
                                   throws IOException
Returns the number of bytes available to this Java virtual machine on the file store. The returned number of available bytes is a hint, but not a guarantee, that it is possible to use most or any of these bytes. The number of usable bytes is most likely to be accurate immediately after the space attributes are obtained. It is likely to be made inaccurate by any external I/O operations including those made on the system outside of this Java virtual machine. Returns: the number of bytes available Throws: `IOException` - if an I/O error occurs

### method:getUnallocatedSpace() [NONE]
- #### getUnallocatedSpace
      public abstract long getUnallocatedSpace()
                                        throws IOException
Returns the number of unallocated bytes in the file store. The returned number of unallocated bytes is a hint, but not a guarantee, that it is possible to use most or any of these bytes. The number of unallocated bytes is most likely to be accurate immediately after the space attributes are obtained. It is likely to be made inaccurate by any external I/O operations including those made on the system outside of this virtual machine. Returns: the number of unallocated bytes Throws: `IOException` - if an I/O error occurs

### method:supportsFileAttributeView(java.lang.Class) [NONE]
- #### supportsFileAttributeView
      public abstract boolean supportsFileAttributeView(Class<? extends FileAttributeView> type)
Tells whether or not this file store supports the file attributes identified by the given file attribute view. Invoking this method to test if the file store supports `BasicFileAttributeView` will always return `true`. In the case of the default provider, this method cannot guarantee to give the correct result when the file store is not a local storage device. The reasons for this are implementation specific and therefore unspecified. Parameters: `type` - the file attribute view type Returns: `true` if, and only if, the file attribute view is supported

### method:supportsFileAttributeView(java.lang.String) [NONE]
- #### supportsFileAttributeView
      public abstract boolean supportsFileAttributeView(String name)
Tells whether or not this file store supports the file attributes identified by the given file attribute view. Invoking this method to test if the file store supports `BasicFileAttributeView`, identified by the name "`basic`" will always return `true`. In the case of the default provider, this method cannot guarantee to give the correct result when the file store is not a local storage device. The reasons for this are implementation specific and therefore unspecified. Parameters: `name` - the `name` of file attribute view Returns: `true` if, and only if, the file attribute view is supported

### method:getFileStoreAttributeView(java.lang.Class) [NONE]
- #### getFileStoreAttributeView
      public abstract <V extends FileStoreAttributeView> V getFileStoreAttributeView(Class<V> type)
Returns a `FileStoreAttributeView` of the given type. This method is intended to be used where the file store attribute view defines type-safe methods to read or update the file store attributes. The `type` parameter is the type of the attribute view required and the method returns an instance of that type if supported. Type Parameters: `V` - The `FileStoreAttributeView` type Parameters: `type` - the `Class` object corresponding to the attribute view Returns: a file store attribute view of the specified type or `null` if the attribute view is not available

### method:getAttribute(java.lang.String) [NONE]
- #### getAttribute
      public abstract Object getAttribute(String attribute)
                                   throws IOException
  Reads the value of a file store attribute. The `attribute` parameter identifies the attribute to be read and takes the form: view-name:attribute-name where the character `':'` stands for itself. view-name is the `name` of a `AttributeView` that identifies a set of file attributes. attribute-name is the name of the attribute. Usage Example: Suppose we want to know if ZFS compression is enabled (assuming the "zfs" view is supported):
          boolean compression = (Boolean)fs.getAttribute("zfs:compression");
Parameters: `attribute` - the attribute to read Returns: the attribute value; `null` may be valid for some attributes Throws: `UnsupportedOperationException` - if the attribute view is not available or it does not support reading the attribute `IOException` - if an I/O error occurs