DirRandomAccessFile (Apache Derby V10.14 Internals)

java.lang.Object
- java.io.RandomAccessFile
- - org.apache.derby.impl.io.DirRandomAccessFile

All Implemented Interfaces:

java.io.Closeable, java.io.DataInput, java.io.DataOutput, java.lang.AutoCloseable, StorageRandomAccessFile
```
class DirRandomAccessFile
extends java.io.RandomAccessFile
implements StorageRandomAccessFile
```
This class provides a disk based implementation of the StIRandomAccess File interface. It is used by the database engine to access persistent data and transaction logs under the directory (default) subsubprotocol.

Field Summary

Fields
Modifier and Type Field Description

private java.lang.String _mode

private java.io.File _name

Fields
Modifier and Type	Field	Description
`private java.lang.String`	`_mode`
`private java.io.File`	`_name`

Constructor Summary

Constructors
Constructor Description

DirRandomAccessFile(java.io.File name, java.lang.String mode)
Construct a StorageRandomAccessFileImpl.

Constructors
Constructor	Description
`DirRandomAccessFile(java.io.File name, java.lang.String mode)`	Construct a StorageRandomAccessFileImpl.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`DirRandomAccessFile`	`clone()`	Clone this file abstaction
`void`	`sync()`	Force any changes out to the persistent store.

Methods inherited from interface java.io.DataInput
readBoolean, readByte, readChar, readDouble, readFloat, readFully, readFully, readInt, readLine, readLong, readShort, readUnsignedByte, readUnsignedShort, readUTF, skipBytes

Methods inherited from interface java.io.DataOutput
write, write, write, writeBoolean, writeByte, writeBytes, writeChar, writeChars, writeDouble, writeFloat, writeInt, writeLong, writeShort, writeUTF

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

Methods inherited from class java.io.RandomAccessFile
close, getChannel, getFD, getFilePointer, length, read, read, read, readBoolean, readByte, readChar, readDouble, readFloat, readFully, readFully, readInt, readLine, readLong, readShort, readUnsignedByte, readUnsignedShort, readUTF, seek, setLength, skipBytes, write, write, write, writeBoolean, writeByte, writeBytes, writeChar, writeChars, writeDouble, writeFloat, writeInt, writeLong, writeShort, writeUTF

Methods inherited from interface org.apache.derby.io.StorageRandomAccessFile
close, getFilePointer, length, read, seek, setLength

- Field Detail
  - _name
```
private final java.io.File _name
```
  - _mode
```
private final java.lang.String _mode
```
- Constructor Detail
  - DirRandomAccessFile
```
DirRandomAccessFile(java.io.File name,
                    java.lang.String mode)
             throws java.io.FileNotFoundException
```
    Construct a StorageRandomAccessFileImpl.
    
    Parameters:
    
    name - The file name.
    
    mode - The file open mode: "r", "rw", "rws", or "rwd". The "rws" and "rwd" modes specify that the file is to be synchronized, consistent with the java.io.RandomAccessFile class. However the StorageRandomAccessFile.sync() method will be called even if the file was opened in "rws" or "rwd" mode. If the "rws" or "rwd" modes are supported then the implementation of StorageRandomAccessFile.sync need not do anything.
    
    Throws:
    
    java.lang.IllegalArgumentException - if the mode argument is not equal to one of "r", "rw".
    
    java.io.FileNotFoundException - if the file exists but is a directory rather than a regular file, or cannot be opened or created for any other reason .
- Method Detail
  - clone
```
public DirRandomAccessFile clone()
```
    Clone this file abstaction
    
    Specified by:
    
    clone in interface StorageRandomAccessFile
    
    Overrides:
    
    clone in class java.lang.Object
  - sync
```
public void sync()
          throws java.io.IOException
```
    Force any changes out to the persistent store.
    
    Specified by:
    
    sync in interface StorageRandomAccessFile
    
    Throws:
    
    java.io.IOException - If an IO error occurs.

Class DirRandomAccessFile

Field Summary

Constructor Summary

Method Summary

Methods inherited from interface java.io.DataInput

Methods inherited from interface java.io.DataOutput

Methods inherited from class java.lang.Object

Methods inherited from class java.io.RandomAccessFile

Methods inherited from interface org.apache.derby.io.StorageRandomAccessFile

Field Detail

_name

_mode

Constructor Detail

DirRandomAccessFile

Method Detail

clone

sync