Movatterモバイル変換

java.lang.Object
- java.nio.file.FileStore

```
public abstract classFileStoreextendsObject
```
Storage for files. AFileStore represents a storage pool, device, partition, volume, concrete file system or other implementation specific means of file storage. TheFileStore for where a file is stored is obtained by invoking thegetFileStore method, or all file stores can be enumerated by invoking thegetFileStores method.
In addition to the methods defined by this class, a file store may support one or moreFileStoreAttributeView classes that provide a read-only or updatable view of a set of file store attributes.
Since:
1.7

Constructor Summary
Constructors
Modifier Constructor Description
protected FileStore()
Initializes a new instance of this class.

Constructors
Modifier	Constructor	Description
`protected`	`FileStore()`	Initializes a new instance of this class.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`abstractObject`	`getAttribute(String attribute)`	Reads the value of a file store attribute.
`abstract <V extendsFileStoreAttributeView> V`	`getFileStoreAttributeView(Class<V> type)`	Returns a`FileStoreAttributeView` of the given type.
`abstract long`	`getTotalSpace()`	Returns the size, in bytes, of the file store.
`abstract long`	`getUnallocatedSpace()`	Returns the number of unallocated bytes in the file store.
`abstract long`	`getUsableSpace()`	Returns the number of bytes available to this Java virtual machine on the file store.
`abstract boolean`	`isReadOnly()`	Tells whether this file store is read-only.
`abstractString`	`name()`	Returns the name of this file store.
`abstract boolean`	`supportsFileAttributeView(Class<? extendsFileAttributeView> type)`	Tells whether or not this file store supports the file attributes identified by the given file attribute view.
`abstract boolean`	`supportsFileAttributeView(String name)`	Tells whether or not this file store supports the file attributes identified by the given file attribute view.
`abstractString`	`type()`	Returns thetype of this file store.

Methods inherited from class java.lang.Object
clone,equals,finalize,getClass,hashCode,notify,notifyAll,toString,wait,wait,wait

- Constructor Detail
  - FileStore
```
protected FileStore()
```
    Initializes a new instance of this class.
- Method Detail
  - 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 thetoString method.
    Returns:
    the name of this file store
  - type
```
public abstract String type()
```
    Returns thetype 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
  - 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 anIOException to be thrown.
    Returns:
    true if, and only if, this file store is read-only
  - getTotalSpace
```
public abstract long getTotalSpace()                            throwsIOException
```
    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
  - getUsableSpace
```
public abstract long getUsableSpace()                             throwsIOException
```
    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
  - getUnallocatedSpace
```
public abstract long getUnallocatedSpace()                                  throwsIOException
```
    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
  - supportsFileAttributeView
```
public abstract boolean supportsFileAttributeView(Class<? extendsFileAttributeView> 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 supportsBasicFileAttributeView will always returntrue. 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
  - 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 supportsBasicFileAttributeView, identified by the name "basic" will always returntrue. 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 - thename of file attribute view
    Returns:
    true if, and only if, the file attribute view is supported
  - getFileStoreAttributeView
```
public abstract <V extendsFileStoreAttributeView> V getFileStoreAttributeView(Class<V> type)
```
    Returns aFileStoreAttributeView 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. Thetype parameter is the type of the attribute view required and the method returns an instance of that type if supported.
    Type Parameters:
    V - TheFileStoreAttributeView type
    Parameters:
    type - theClass object corresponding to the attribute view
    Returns:
    a file store attribute view of the specified type ornull if the attribute view is not available
  - getAttribute
```
public abstract Object getAttribute(String attribute)                             throwsIOException
```
    Reads the value of a file store attribute.
    Theattribute parameter identifies the attribute to be read and takes the form:
    view-name:attribute-name
    where the character':' stands for itself.
    view-name is thename of aAttributeView 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 a valid 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

Movatterモバイル変換

Class FileStore

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

FileStore

Method Detail

name

type

isReadOnly

getTotalSpace

getUsableSpace

getUnallocatedSpace

supportsFileAttributeView

supportsFileAttributeView

getFileStoreAttributeView

getAttribute