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Java Source Code / Java Documentation » Apache Harmony Java SE » java package » java.io

Source Cross Reference Class Diagram Java Document (Java Doc)

java.lang .Object

java.io .FileDescriptor

FileDescriptor

final public class FileDescriptor (Code)

FileDescriptor is the lowest level representation of a File, Device, or Socket. You can create any of the IO classes which take a FileDescriptor as an argument by querying an open Socket or File for the FileDescriptor.

The FileDescriptor class also contains static fields representing Standard Input, Output and Error. You can use these directly if desired but it is recommended you go through System.in, System.out, and System.err streams respectively.

Applications should not create new FileDescriptors.
See Also:   FileInputStream.getFD
See Also:   FileOutputStream.getFD
See Also:   RandomAccessFile.getFD

Field Summary
long	descriptor Represents a link to any underlying OS resources for this FileDescriptor.
final public static FileDescriptor	err
final public static FileDescriptor	in
final public static FileDescriptor	out
boolean	readOnly

Constructor Summary
public	FileDescriptor() Constructs a new FileDescriptor containing an invalid handle.

Method Summary
public void	sync() Ensures that data which is buffered within the underlying implementation is written out to the appropriate device before returning.
public boolean	valid() Answers a boolean indicating whether or not this FileDescriptor is valid.

Field Detail

descriptor
long descriptor(Code)
	Represents a link to any underlying OS resources for this FileDescriptor. A value of -1 indicates that this FileDescriptor is invalid.

err
final public static FileDescriptor err(Code)
	FileDescriptor representing Standard Error

in
final public static FileDescriptor in(Code)
	FileDescriptor representing Standard In

out
final public static FileDescriptor out(Code)
	FileDescriptor representing Standard Out

readOnly
boolean readOnly(Code)

Constructor Detail

FileDescriptor
public FileDescriptor()(Code)
	Constructs a new FileDescriptor containing an invalid handle. This constructor does nothing interesting. Provided for signature compatibility.

Method Detail

sync
public void sync() throws SyncFailedException(Code)
	Ensures that data which is buffered within the underlying implementation is written out to the appropriate device before returning. throws: SyncFailedException - when the operation fails

valid
public boolean valid()(Code)
	Answers a boolean indicating whether or not this FileDescriptor is valid. `true` if this FileDescriptor is valid,`false` otherwise

Methods inherited from java.lang.Object

protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object object)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final public Class<? extends Object> getClass()(Code)(Java Doc)
public int hashCode()(Code)(Java Doc)
final public void notify()(Code)(Java Doc)
final public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final public void wait(long millis, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait(long millis) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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