BufferedReadOnlyFile (TrueZIP Kernel 7.0-rc1 API)

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TrueZIP Kernel 7.0-rc1

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de.schlichtherle.truezip.rof
Class BufferedReadOnlyFile

java.lang.Object
  de.schlichtherle.truezip.rof.AbstractReadOnlyFile
      de.schlichtherle.truezip.rof.DecoratingReadOnlyFile
          de.schlichtherle.truezip.rof.BufferedReadOnlyFile

All Implemented Interfaces:: ReadOnlyFile, Closeable

@NotThreadSafe public class BufferedReadOnlyFile
extends DecoratingReadOnlyFile
extends DecoratingReadOnlyFile

A ReadOnlyFile implementation which provides buffered random read only access to another ReadOnlyFile.

Note: This class implements its own virtual file pointer. Thus, if you would like to access the underlying ReadOnlyFile again after you have finished working with an instance of this class, you should synchronize their file pointers using the pattern as described in DecoratingReadOnlyFile.

Author:: Christian Schlichtherle

Field Summary
`private boolean`	`closed`
`private long`	`fp` The virtual file pointer in the file data.
`private long`	`length`
`private byte[]`	`window` The buffer window to the file data.
`static int`	`WINDOW_LEN` The default buffer length of the window to the file.
`private long`	`windowOff` The current offset in the read only file where the buffer window starts.

Fields inherited from class de.schlichtherle.truezip.rof.DecoratingReadOnlyFile
`delegate`

Constructor Summary
	`BufferedReadOnlyFile(File file)` Creates a new instance of `BufferedReadOnlyFile`.
	`BufferedReadOnlyFile(File file, int windowLen)` Creates a new instance of `BufferedReadOnlyFile`.
	`BufferedReadOnlyFile(ReadOnlyFile rof)` Creates a new instance of `BufferedReadOnlyFile`.
`private`	`BufferedReadOnlyFile(ReadOnlyFile rof, File file, int windowLen)`
	`BufferedReadOnlyFile(ReadOnlyFile rof, int windowLen)` Creates a new instance of `BufferedReadOnlyFile`.

Method Summary
`private void`	`assertOpen()` Asserts that this file is open.
`void`	`close()` Closes this read only file.
`long`	`getFilePointer()` Returns the current byte position in the file as a zero-based index.
`private void`	`invalidateWindow()` Forces the window to be reloaded on the next call to `positionWindow()`.
`long`	`length()` Returns the length of the file in bytes.
`protected static long`	`max(long a, long b)` Returns the greater parameter.
`protected static long`	`min(long a, long b)` Returns the smaller parameter.
`private void`	`positionWindow()` Positions the window so that the block containing the current virtual file pointer in the encrypted file is entirely contained in it.
`int`	`read()` Reads and returns the next byte or -1 if the end of the file has been reached.
`int`	`read(byte[] buf, int off, int len)` Reads up to `len` bytes of data from this read only file into the given array.
`void`	`seek(long fp)` Sets the current byte position in the file as a zero-based index at which the next read occurs.

Methods inherited from class de.schlichtherle.truezip.rof.DecoratingReadOnlyFile
`toString`

Methods inherited from class de.schlichtherle.truezip.rof.AbstractReadOnlyFile
`read, readFully, readFully`

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

Field Detail

WINDOW_LEN

public static final int WINDOW_LEN

The default buffer length of the window to the file.

See Also:: Constant Field Values

length

private long length

fp

private long fp

The virtual file pointer in the file data. This is relative to the start of the file.

windowOff

private long windowOff

The current offset in the read only file where the buffer window starts. This is always a multiple of the buffer window size.

window

private final byte[] window

The buffer window to the file data.

closed

private boolean closed

Constructor Detail

BufferedReadOnlyFile

public BufferedReadOnlyFile(File file)
                     throws NullPointerException,
                            FileNotFoundException,
                            IOException

Creates a new instance of BufferedReadOnlyFile.

Parameters:: file - The file to read.
Throws:: NullPointerException - If any of the parameters is null.; FileNotFoundException - If the file cannot get opened for reading.; IOException - On any other I/O related issue.

BufferedReadOnlyFile

public BufferedReadOnlyFile(File file,
                            int windowLen)
                     throws NullPointerException,
                            FileNotFoundException,
                            IOException

Creates a new instance of BufferedReadOnlyFile.

Parameters:: file - The file to read.; windowLen - The size of the buffer window in bytes.
Throws:: NullPointerException - If any of the parameters is null.; FileNotFoundException - If the file cannot get opened for reading.; IOException - On any other I/O related issue.

BufferedReadOnlyFile

public BufferedReadOnlyFile(ReadOnlyFile rof)
                     throws NullPointerException,
                            FileNotFoundException,
                            IOException

Creates a new instance of BufferedReadOnlyFile.

Parameters:: rof - The read only file to read.
Throws:: NullPointerException - If any of the parameters is null.; FileNotFoundException - If the file cannot get opened for reading.; IOException - On any other I/O related issue.

BufferedReadOnlyFile

public BufferedReadOnlyFile(ReadOnlyFile rof,
                            int windowLen)
                     throws NullPointerException,
                            FileNotFoundException,
                            IOException

Creates a new instance of BufferedReadOnlyFile.

Parameters:: rof - The read only file to read.; windowLen - The size of the buffer window in bytes.
Throws:: NullPointerException - If any of the parameters is null.; FileNotFoundException - If the file cannot get opened for reading.; IOException - On any other I/O related issue.

BufferedReadOnlyFile

private BufferedReadOnlyFile(ReadOnlyFile rof,
                             File file,
                             int windowLen)
                      throws NullPointerException,
                             FileNotFoundException,
                             IOException

Throws:: NullPointerException; FileNotFoundException; IOException

Method Detail

min

protected static long min(long a,
                          long b)

Returns the smaller parameter.

max

protected static long max(long a,
                          long b)

Returns the greater parameter.