com.trolltech.qt.core
Class QAbstractFileEngine.Extension

java.lang.Object
  extended by java.lang.Enum
      extended by com.trolltech.qt.core.QAbstractFileEngine.Extension
All Implemented Interfaces:
QtEnumerator, java.io.Serializable, java.lang.Comparable
Enclosing class:
QAbstractFileEngine

public static final class QAbstractFileEngine.Extension
extends java.lang.Enum
implements QtEnumerator

This enum describes the types of extensions that the file engine can support. Before using these extensions, you must verify that the extension is supported (i.e., call supportsExtension()).

See Also:
Serialized Form

Field Summary
static QAbstractFileEngine.Extension AtEndExtension
          Whether the current file position is at the end of the file or not.
static QAbstractFileEngine.Extension CustomEnum
           
static QAbstractFileEngine.Extension FastReadLineExtension
          Whether the file engine provides a fast implementation for readLine() or not.
static QAbstractFileEngine.Extension MapExtension
          Whether the file engine provides the ability to map a file to memory.
static QAbstractFileEngine.Extension UnMapExtension
          Whether the file engine provides the ability to unmap memory that was previously mapped.
 
Method Summary
static QAbstractFileEngine.Extension resolve(int value)
          Returns the QAbstractFileEngine$Extension constant with the specified int.
 int value()
          This function should return an integer value for the enum values of the enumeration that implements this interface.
static QAbstractFileEngine.Extension valueOf(java.lang.String name)
           
static QAbstractFileEngine.Extension[] values()
           
 
Methods inherited from class java.lang.Enum
clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf
 
Methods inherited from class java.lang.Object
getClass, notify, notifyAll, wait, wait, wait
 

Field Detail

AtEndExtension

public static final QAbstractFileEngine.Extension AtEndExtension
Whether the current file position is at the end of the file or not. This extension allows file engines that implement local buffering to report end-of-file status without having to check the size of the file. It is also useful for sequential files, where the size of the file cannot be used to determine whether or not you have reached the end. This extension returns true if the file is at the end; otherwise it returns false. The input and output arguments to extension() are ignored.


FastReadLineExtension

public static final QAbstractFileEngine.Extension FastReadLineExtension
Whether the file engine provides a fast implementation for readLine() or not. If readLine() remains unimplemented in the file engine, QAbstractFileEngine will provide an implementation based on calling read() repeatedly. If supportsExtension() returns false for this extension, however, QIODevice can provide a faster implementation by making use of its internal buffer. For engines that already provide a fast readLine() implementation, returning false for this extension can avoid unnnecessary double-buffering in QIODevice.


MapExtension

public static final QAbstractFileEngine.Extension MapExtension
Whether the file engine provides the ability to map a file to memory.


UnMapExtension

public static final QAbstractFileEngine.Extension UnMapExtension
Whether the file engine provides the ability to unmap memory that was previously mapped.


CustomEnum

public static final QAbstractFileEngine.Extension CustomEnum
Method Detail

values

public static QAbstractFileEngine.Extension[] values()

valueOf

public static QAbstractFileEngine.Extension valueOf(java.lang.String name)

value

public int value()
This function should return an integer value for the enum values of the enumeration that implements this interface.

Specified by:
value in interface QtEnumerator

resolve

public static QAbstractFileEngine.Extension resolve(int value)
Returns the QAbstractFileEngine$Extension constant with the specified int.