RandomAccessFile (NetCDF-Java CDM API v5.3.3)

java.lang.Object
- ucar.unidata.io.RandomAccessFile

All Implemented Interfaces:

Closeable, DataInput, DataOutput, AutoCloseable, ucar.nc2.util.cache.FileCacheable

Direct Known Subclasses:

InMemoryRandomAccessFile, MMapRandomAccessFile, RemoteRandomAccessFile
```
@NotThreadSafe
public class RandomAccessFile
extends Object
implements DataInput, DataOutput, ucar.nc2.util.cache.FileCacheable, Closeable
```
A buffered drop-in replacement for java.io.RandomAccessFile. Instances of this class realise substantial speed increases over java.io.RandomAccessFile through the use of buffering. This is a subclass of Object, as it was not possible to subclass java.io.RandomAccessFile because many of the methods are final. However, if it is necessary to use RandomAccessFile and java.io.RandomAccessFile interchangeably, both classes implement the DataInput and DataOutput interfaces.

By Russ Rew, based on BufferedRandomAccessFile by Alex McManus, based on Sun's source code for java.io.RandomAccessFile. For Alex McManus version from which this derives, see his Freeware Java Classes.
Must be thread confined - that is, can only be used by a single thread at a time..

See Also:

DataInput, DataOutput, RandomAccessFile

Field Summary

Fields
Modifier and Type Field and Description

static int BIG_ENDIAN

static int LITTLE_ENDIAN

Fields
Modifier and Type	Field and Description
`static int`	`BIG_ENDIAN`
`static int`	`LITTLE_ENDIAN`

Constructor Summary

Constructors
Constructor and Description
`RandomAccessFile(String location, String mode)` Constructor, default buffer size.
`RandomAccessFile(String location, String mode, int bufferSize)` Constructor.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`static RandomAccessFile`	`acquire(String location)`
`static RandomAccessFile`	`acquire(String location, int buffer_size)`
`void`	`close()` Close the file, and release any associated system resources.
`static void`	`eject(String location)`
`static void`	`enableDefaultGlobalFileCache()`
`void`	`flush()` Copy the contents of the buffer to the disk.
`static List<String>`	`getAllFiles()` Debugging, do not use.
`int`	`getBufferSize()` Get the buffer size
`static boolean`	`getDebugLeaks()` Debugging, do not use.
`static long`	`getDebugNbytes()` Debugging, do not use.
`static int`	`getDebugNseeks()` Debugging, do not use.
`long`	`getFilePointer()` Returns the current position in the file, where the next read or write will occur.
`static ucar.nc2.util.cache.FileCacheIF`	`getGlobalFileCache()`
`long`	`getLastModified()`
`String`	`getLocation()` Get the file location, or name.
`static int`	`getMaxOpenFileCount()`
`static long`	`getOpenFileCount()`
`static List<String>`	`getOpenFiles()` Debugging, do not use.
`RandomAccessFile`	`getRandomAccessFile()` Allow access to the underlying java.io.RandomAccessFile.
`boolean`	`isAtEndOfFile()` Return true if file pointer is at end of file.
`long`	`length()` Get the length of the file.
`void`	`order(ByteOrder bo)`
`void`	`order(int endian)` Change the current endian mode.
`void`	`reacquire()`
`int`	`read()` Read a byte of data from the file, blocking until data is available.
`int`	`read(byte[] b)` Read up to `b.length( )` bytes into an array.
`int`	`read(byte[] b, int off, int len)` Read up to `len` bytes into an array, at a specified offset.
`boolean`	`readBoolean()` Reads a `boolean` from this file.
`byte`	`readByte()` Reads a signed 8-bit value from this file.
`int`	`readBytes(byte[] b, int off, int len)` Read up to `len` bytes into an array, at a specified offset.
`byte[]`	`readBytes(int count)` Read fully count number of bytes
`char`	`readChar()` Reads a Unicode character from this file.
`double`	`readDouble()` Reads a `double` from this file.
`void`	`readDouble(double[] pa, int start, int n)` Read an array of doubles
`float`	`readFloat()` Reads a `float` from this file.
`void`	`readFloat(float[] pa, int start, int n)` Read an array of floats
`void`	`readFully(byte[] b)` Reads `b.length` bytes from this file into the byte array.
`void`	`readFully(byte[] b, int off, int len)` Reads exactly `len` bytes from this file into the byte array.
`int`	`readInt()` Reads a signed 32-bit integer from this file.
`void`	`readInt(int[] pa, int start, int n)` Read an array of ints
`int`	`readIntUnbuffered(long pos)` Read an integer at the given position, bypassing all buffering.
`String`	`readLine()` Reads the next line of text from this file.
`long`	`readLong()` Reads a signed 64-bit integer from this file.
`void`	`readLong(long[] pa, int start, int n)` Read an array of longs
`short`	`readShort()` Reads a signed 16-bit number from this file.
`void`	`readShort(short[] pa, int start, int n)` Read an array of shorts
`String`	`readString(int nbytes)` Read a String of known length.
`String`	`readString(int nbytes, Charset charset)` Read a String of known length.
`String`	`readStringMax(int nbytes)` Read a String of max length, zero terminate.
`String`	`readStringMax(int nbytes, Charset charset)` Read a String of max length, zero terminate.
`long`	`readToByteChannel(WritableByteChannel dest, long offset, long nbytes)` Read `nbytes` bytes, at the specified file offset, send to a WritableByteChannel.
`int`	`readUnsignedByte()` Reads an unsigned 8-bit number from this file.
`int`	`readUnsignedShort()` Reads an unsigned 16-bit number from this file.
`String`	`readUTF()` Reads in a string from this file.
`void`	`release()`
`boolean`	`searchForward(KMPMatch match, int maxBytes)` Search forward from the current pos, looking for a match.
`void`	`seek(long pos)` Set the position in the file for the next read or write.
`void`	`setBufferSize(int bufferSize)` Set the buffer size.
`static void`	`setDebugAccess(boolean b)` Debugging, do not use.
`static void`	`setDebugLeaks(boolean b)` Debugging, do not use in production.
`void`	`setExtendMode()` Set extendMode for truncated, yet valid files - old NetCDF code allowed this when NOFILL on, and user doesnt write all variables.
`void`	`setFileCache(ucar.nc2.util.cache.FileCacheIF fileCache)`
`static void`	`setGlobalFileCache(ucar.nc2.util.cache.FileCacheIF _cache)`
`void`	`setMinLength(long minLength)` Make sure file is at least this long when its closed.
`static void`	`shutdown()`
`int`	`skipBytes(int n)` Skips exactly `n` bytes of input.
`long`	`skipBytes(long n)`
`String`	`toString()` Create a string representation of this object.
`void`	`unread()` Unread the last byte read.
`void`	`write(byte[] b)` Writes `b.length` bytes from the specified byte array starting at offset `off` to this file.
`void`	`write(byte[] b, int off, int len)` Writes `len` bytes from the specified byte array starting at offset `off` to this file.
`void`	`write(int b)` Write a byte to the file.
`void`	`writeBoolean(boolean v)` Writes a `boolean` to the file as a 1-byte value.
`void`	`writeBoolean(boolean[] pa, int start, int n)` Write an array of booleans
`void`	`writeByte(int v)` Writes a `byte` to the file as a 1-byte value.
`void`	`writeBytes(byte[] b, int off, int len)` Write `len` bytes from an array to the file.
`void`	`writeBytes(char[] b, int off, int len)` Writes the character array to the file as a sequence of bytes.
`void`	`writeBytes(String s)` Writes the string to the file as a sequence of bytes.
`void`	`writeChar(char[] pa, int start, int n)` Write an array of chars
`void`	`writeChar(int v)` Writes a `char` to the file as a 2-byte value, high byte first.
`void`	`writeChars(String s)` Writes a string to the file as a sequence of characters.
`void`	`writeDouble(double v)` Converts the double argument to a `long` using the `doubleToLongBits` method in class `Double`, and then writes that `long` value to the file as an 8-byte quantity, high byte first.
`void`	`writeDouble(double[] pa, int start, int n)` Write an array of doubles
`void`	`writeFloat(float v)` Converts the float argument to an `int` using the `floatToIntBits` method in class `Float`, and then writes that `int` value to the file as a 4-byte quantity, high byte first.
`void`	`writeFloat(float[] pa, int start, int n)` Write an array of floats
`void`	`writeInt(int v)` Writes an `int` to the file as four bytes, high byte first.
`void`	`writeInt(int[] pa, int start, int n)` Write an array of ints
`void`	`writeLong(long v)` Writes a `long` to the file as eight bytes, high byte first.
`void`	`writeLong(long[] pa, int start, int n)` Write an array of longs
`void`	`writeShort(int v)` Writes a `short` to the file as two bytes, high byte first.
`void`	`writeShort(short[] pa, int start, int n)` Write an array of shorts
`void`	`writeUTF(String str)` Writes a string to the file using UTF-8 encoding in a machine-independent manner.

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

- Field Detail
  - BIG_ENDIAN
```
public static final int BIG_ENDIAN
```
    See Also:
    
    Constant Field Values
  - LITTLE_ENDIAN
```
public static final int LITTLE_ENDIAN
```
    See Also:
    
    Constant Field Values
- Constructor Detail
  - RandomAccessFile
```
public RandomAccessFile(String location,
                        String mode)
                 throws IOException
```
    Constructor, default buffer size.
    
    Parameters:
    
    location - location of the file
    
    mode - same as for java.io.RandomAccessFile, usually "r" or "rw"
    
    Throws:
    
    IOException - on open error
  - RandomAccessFile
```
public RandomAccessFile(String location,
                        String mode,
                        int bufferSize)
                 throws IOException
```
    Constructor.
    
    Parameters:
    
    location - location of the file
    
    mode - same as for java.io.RandomAccessFile
    
    bufferSize - size of buffer to use.
    
    Throws:
    
    IOException - on open error
- Method Detail
  - getDebugLeaks
```
public static boolean getDebugLeaks()
```
    Debugging, do not use.
    
    Returns:
    
    true if debugLeaks is on
  - setDebugLeaks
```
public static void setDebugLeaks(boolean b)
```
    Debugging, do not use in production. Set counters to zero, set debugging on
    
    Parameters:
    
    b - set true to track java.io.RandomAccessFile
  - getOpenFiles
```
public static List<String> getOpenFiles()
```
    Debugging, do not use.
    
    Returns:
    
    list of open files.
  - getOpenFileCount
```
public static long getOpenFileCount()
```
  - getMaxOpenFileCount
```
public static int getMaxOpenFileCount()
```
  - getAllFiles
```
public static List<String> getAllFiles()
```
    Debugging, do not use.
    
    Returns:
    
    list of all files used.
  - setDebugAccess
```
public static void setDebugAccess(boolean b)
```
    Debugging, do not use.
    
    Parameters:
    
    b - to debug file reading
  - getDebugNseeks
```
public static int getDebugNseeks()
```
    Debugging, do not use.
    
    Returns:
    
    number of seeks
  - getDebugNbytes
```
public static long getDebugNbytes()
```
    Debugging, do not use.
    
    Returns:
    
    number of bytes read
  - enableDefaultGlobalFileCache
```
public static void enableDefaultGlobalFileCache()
```
  - setGlobalFileCache
```
public static void setGlobalFileCache(ucar.nc2.util.cache.FileCacheIF _cache)
```
  - getGlobalFileCache
```
public static ucar.nc2.util.cache.FileCacheIF getGlobalFileCache()
```
  - acquire
```
public static RandomAccessFile acquire(String location)
                                throws IOException
```
    Throws:
    
    IOException
  - acquire
```
public static RandomAccessFile acquire(String location,
                                       int buffer_size)
                                throws IOException
```
    Throws:
    
    IOException
  - eject
```
public static void eject(String location)
```
  - shutdown
```
public static void shutdown()
```
  - getRandomAccessFile
```
public RandomAccessFile getRandomAccessFile()
```
    Allow access to the underlying java.io.RandomAccessFile. WARNING! BROKEN ENCAPSOLATION, DO NOT USE. May change implementation in the future.
    
    Returns:
    
    the underlying java.io.RandomAccessFile.
  - setBufferSize
```
public void setBufferSize(int bufferSize)
```
    Set the buffer size. If writing, call flush() first.
    
    Parameters:
    
    bufferSize - length in bytes
  - getBufferSize
```
public int getBufferSize()
```
    Get the buffer size
    
    Returns:
    
    bufferSize length in bytes
  - close
```
public void close()
           throws IOException
```
    Close the file, and release any associated system resources.
    
    Specified by:
    
    close in interface Closeable
    
    Specified by:
    
    close in interface AutoCloseable
    
    Specified by:
    
    close in interface ucar.nc2.util.cache.FileCacheable
    
    Throws:
    
    IOException - if an I/O error occurrs.
  - release
```
public void release()
```
    Specified by:
    
    release in interface ucar.nc2.util.cache.FileCacheable
  - reacquire
```
public void reacquire()
```
    Specified by:
    
    reacquire in interface ucar.nc2.util.cache.FileCacheable
  - setFileCache
```
public void setFileCache(ucar.nc2.util.cache.FileCacheIF fileCache)
```
    Specified by:
    
    setFileCache in interface ucar.nc2.util.cache.FileCacheable
  - getLastModified
```
public long getLastModified()
```
    Specified by:
    
    getLastModified in interface ucar.nc2.util.cache.FileCacheable
  - isAtEndOfFile
```
public boolean isAtEndOfFile()
```
    Return true if file pointer is at end of file.
    
    Returns:
    
    true if file pointer is at end of file
  - seek
```
public void seek(long pos)
          throws IOException
```
    Set the position in the file for the next read or write.
    
    Parameters:
    
    pos - the offset (in bytes) from the start of the file.
    
    Throws:
    
    IOException - if an I/O error occurrs.
  - getFilePointer
```
public long getFilePointer()
```
    Returns the current position in the file, where the next read or write will occur.
    
    Returns:
    
    the offset from the start of the file in bytes.
  - getLocation
```
public String getLocation()
```
    Get the file location, or name.
    
    Specified by:
    
    getLocation in interface ucar.nc2.util.cache.FileCacheable
    
    Returns:
    
    file location
  - length
```
public long length()
            throws IOException
```
    Get the length of the file. The data in the buffer (which may not have been written the disk yet) is taken into account.
    
    Returns:
    
    the length of the file in bytes.
    
    Throws:
    
    IOException - if an I/O error occurrs.
  - order
```
public void order(int endian)
```
    Change the current endian mode. Subsequent reads of short, int, float, double, long, char will use this. Does not currently affect writes. Default values is BIG_ENDIAN.
    
    Parameters:
    
    endian - RandomAccessFile.BIG_ENDIAN or RandomAccessFile.LITTLE_ENDIAN
  - order
```
public void order(ByteOrder bo)
```
  - flush
```
public void flush()
           throws IOException
```
    Copy the contents of the buffer to the disk.
    
    Throws:
    
    IOException - if an I/O error occurs.
  - setMinLength
```
public void setMinLength(long minLength)
```
    Make sure file is at least this long when its closed. needed when not using fill mode, and not all data is written.
    
    Parameters:
    
    minLength - minimum length of the file.
  - setExtendMode
```
public void setExtendMode()
```
    Set extendMode for truncated, yet valid files - old NetCDF code allowed this when NOFILL on, and user doesnt write all variables.
  - read
```
public int read()
         throws IOException
```
    Read a byte of data from the file, blocking until data is available.
    
    Returns:
    
    the next byte of data, or -1 if the end of the file is reached.
    
    Throws:
    
    IOException - if an I/O error occurrs.
  - readBytes
```
public int readBytes(byte[] b,
                     int off,
                     int len)
              throws IOException
```
    Read up to len bytes into an array, at a specified offset. This will block until at least one byte has been read.
    
    Parameters:
    
    b - the byte array to receive the bytes.
    
    off - the offset in the array where copying will start.
    
    len - the number of bytes to copy.
    
    Returns:
    
    the actual number of bytes read, or -1 if there is not more data due to the end of the file being reached.
    
    Throws:
    
    IOException - if an I/O error occurrs.
  - readToByteChannel
```
public long readToByteChannel(WritableByteChannel dest,
                              long offset,
                              long nbytes)
                       throws IOException
```
    Read nbytes bytes, at the specified file offset, send to a WritableByteChannel. This will block until all bytes are read. This uses the underlying file channel directly, bypassing all user buffers.
    
    Parameters:
    
    dest - write to this WritableByteChannel.
    
    offset - the offset in the file where copying will start.
    
    nbytes - the number of bytes to read.
    
    Returns:
    
    the actual number of bytes read and transfered
    
    Throws:
    
    IOException - if an I/O error occurs.
  - read
```
public int read(byte[] b,
                int off,
                int len)
         throws IOException
```
    Read up to len bytes into an array, at a specified offset. This will block until at least one byte has been read.
    
    Parameters:
    
    b - the byte array to receive the bytes.
    
    off - the offset in the array where copying will start.
    
    len - the number of bytes to copy.
    
    Returns:
    
    the actual number of bytes read, or -1 if there is not more data due to the end of the file being reached.
    
    Throws:
    
    IOException - if an I/O error occurrs.
  - read
```
public int read(byte[] b)
         throws IOException
```
    Read up to b.length( ) bytes into an array. This will block until at least one byte has been read.
    
    Parameters:
    
    b - the byte array to receive the bytes.
    
    Returns:
    
    the actual number of bytes read, or -1 if there is not more data due to the end of the file being reached.
    
    Throws:
    
    IOException - if an I/O error occurrs.
  - readBytes
```
public byte[] readBytes(int count)
                 throws IOException
```
    Read fully count number of bytes
    
    Parameters:
    
    count - how many bytes tp read
    
    Returns:
    
    a byte array of length count, fully read in
    
    Throws:
    
    IOException - if an I/O error occurrs.
  - readFully
```
public final void readFully(byte[] b)
                     throws IOException
```
    Reads b.length bytes from this file into the byte array. This method reads repeatedly from the file until all the bytes are read. This method blocks until all the bytes are read, the end of the stream is detected, or an exception is thrown.
    
    Specified by:
    
    readFully in interface DataInput
    
    Parameters:
    
    b - the buffer into which the data is read.
    
    Throws:
    
    EOFException - if this file reaches the end before reading all the bytes.
    
    IOException - if an I/O error occurs.
  - readFully
```
public final void readFully(byte[] b,
                            int off,
                            int len)
                     throws IOException
```
    Reads exactly len bytes from this file into the byte array. This method reads repeatedly from the file until all the bytes are read. This method blocks until all the bytes are read, the end of the stream is detected, or an exception is thrown.
    
    Specified by:
    
    readFully in interface DataInput
    
    Parameters:
    
    b - the buffer into which the data is read.
    
    off - the start offset of the data.
    
    len - the number of bytes to read.
    
    Throws:
    
    EOFException - if this file reaches the end before reading all the bytes.
    
    IOException - if an I/O error occurs.
  - skipBytes
```
public int skipBytes(int n)
              throws IOException
```
    Skips exactly n bytes of input. This method blocks until all the bytes are skipped, the end of the stream is detected, or an exception is thrown.
    
    Specified by:
    
    skipBytes in interface DataInput
    
    Parameters:
    
    n - the number of bytes to be skipped.
    
    Returns:
    
    the number of bytes skipped, which is always n.
    
    Throws:
    
    EOFException - if this file reaches the end before skipping all the bytes.
    
    IOException - if an I/O error occurs.
  - skipBytes
```
public long skipBytes(long n)
               throws IOException
```
    Throws:
    
    IOException
  - unread
```
public void unread()
```
    Unread the last byte read. This method should not be used more than once between reading operations, or strange things might happen.
  - write
```
public void write(int b)
           throws IOException
```
    Write a byte to the file. If the file has not been opened for writing, an IOException will be raised only when an attempt is made to write the buffer to the file.
    Caveat: the effects of seek( )ing beyond the end of the file are undefined.
    
    Specified by:
    
    write in interface DataOutput
    
    Parameters:
    
    b - write this byte
    
    Throws:
    
    IOException - if an I/O error occurrs.
  - writeBytes
```
public void writeBytes(byte[] b,
                       int off,
                       int len)
                throws IOException
```
    Write len bytes from an array to the file.
    
    Parameters:
    
    b - the array containing the data.
    
    off - the offset in the array to the data.
    
    len - the length of the data.
    
    Throws:
    
    IOException - if an I/O error occurrs.
  - write
```
public void write(byte[] b)
           throws IOException
```
    Writes b.length bytes from the specified byte array starting at offset off to this file.
    
    Specified by:
    
    write in interface DataOutput
    
    Parameters:
    
    b - the data.
    
    Throws:
    
    IOException - if an I/O error occurs.
  - write
```
public void write(byte[] b,
                  int off,
                  int len)
           throws IOException
```
    Writes len bytes from the specified byte array starting at offset off to this file.
    
    Specified by:
    
    write in interface DataOutput
    
    Parameters:
    
    b - the data.
    
    off - the start offset in the data.
    
    len - the number of bytes to write.
    
    Throws:
    
    IOException - if an I/O error occurs.
  - readBoolean
```
public final boolean readBoolean()
                          throws IOException
```
    Reads a boolean from this file. This method reads a single byte from the file. A value of 0 represents false. Any other value represents true. This method blocks until the byte is read, the end of the stream is detected, or an exception is thrown.
    
    Specified by:
    
    readBoolean in interface DataInput
    
    Returns:
    
    the boolean value read.
    
    Throws:
    
    EOFException - if this file has reached the end.
    
    IOException - if an I/O error occurs.
  - readByte
```
public final byte readByte()
                    throws IOException
```
    Reads a signed 8-bit value from this file. This method reads a byte from the file. If the byte read is b, where 0 <= b <= 255, then the result is:
    This method blocks until the byte is read, the end of the stream is detected, or an exception is thrown.
    Specified by:
    
    readByte in interface DataInput
    
    Returns:
    
    the next byte of this file as a signed 8-bit byte.
    
    Throws:
    
    EOFException - if this file has reached the end.
    
    IOException - if an I/O error occurs.
  - readUnsignedByte
```
public final int readUnsignedByte()
                           throws IOException
```
    Reads an unsigned 8-bit number from this file. This method reads a byte from this file and returns that byte.
    This method blocks until the byte is read, the end of the stream is detected, or an exception is thrown.
    
    Specified by:
    
    readUnsignedByte in interface DataInput
    
    Returns:
    
    the next byte of this file, interpreted as an unsigned 8-bit number.
    
    Throws:
    
    EOFException - if this file has reached the end.
    
    IOException - if an I/O error occurs.
  - readShort
```
public final short readShort()
                      throws IOException
```
    Reads a signed 16-bit number from this file. The method reads 2 bytes from this file. If the two bytes read, in order, are b1 and b2, where each of the two values is between 0 and 255, inclusive, then the result is equal to:
    This method blocks until the two bytes are read, the end of the stream is detected, or an exception is thrown.
    Specified by:
    
    readShort in interface DataInput
    
    Returns:
    
    the next two bytes of this file, interpreted as a signed 16-bit number.
    
    Throws:
    
    EOFException - if this file reaches the end before reading two bytes.
    
    IOException - if an I/O error occurs.
  - readShort
```
public final void readShort(short[] pa,
                            int start,
                            int n)
                     throws IOException
```
    Read an array of shorts
    
    Parameters:
    
    pa - read into this array
    
    start - starting at pa[start]
    
    n - read this many elements
    
    Throws:
    
    IOException - on read error
  - readUnsignedShort
```
public final int readUnsignedShort()
                            throws IOException
```
    Reads an unsigned 16-bit number from this file. This method reads two bytes from the file. If the bytes read, in order, are b1 and b2, where 0 <= b1, b2 <= 255, then the result is equal to:
    This method blocks until the two bytes are read, the end of the stream is detected, or an exception is thrown.
    Specified by:
    
    readUnsignedShort in interface DataInput
    
    Returns:
    
    the next two bytes of this file, interpreted as an unsigned 16-bit integer.
    
    Throws:
    
    EOFException - if this file reaches the end before reading two bytes.
    
    IOException - if an I/O error occurs.
  - readChar
```
public final char readChar()
                    throws IOException
```
    Reads a Unicode character from this file. This method reads two bytes from the file. If the bytes read, in order, are b1 and b2, where 0 <= b1, b2 <= 255, then the result is equal to:
    This method blocks until the two bytes are read, the end of the stream is detected, or an exception is thrown.
    Specified by:
    
    readChar in interface DataInput
    
    Returns:
    
    the next two bytes of this file as a Unicode character.
    
    Throws:
    
    EOFException - if this file reaches the end before reading two bytes.
    
    IOException - if an I/O error occurs.
  - readInt
```
public final int readInt()
                  throws IOException
```
    Reads a signed 32-bit integer from this file. This method reads 4 bytes from the file. If the bytes read, in order, are b1, b2, b3, and b4, where 0 <= b1, b2, b3, b4 <= 255, then the result is equal to:
    This method blocks until the four bytes are read, the end of the stream is detected, or an exception is thrown.
    Specified by:
    
    readInt in interface DataInput
    
    Returns:
    
    the next four bytes of this file, interpreted as an int.
    
    Throws:
    
    EOFException - if this file reaches the end before reading four bytes.
    
    IOException - if an I/O error occurs.
  - readIntUnbuffered
```
public final int readIntUnbuffered(long pos)
                            throws IOException
```
    Read an integer at the given position, bypassing all buffering.
    
    Parameters:
    
    pos - read a byte at this position
    
    Returns:
    
    The int that was read
    
    Throws:
    
    IOException - if an I/O error occurs.
  - readInt
```
public final void readInt(int[] pa,
                          int start,
                          int n)
                   throws IOException
```
    Read an array of ints
    
    Parameters:
    
    pa - read into this array
    
    start - starting at pa[start]
    
    n - read this many elements
    
    Throws:
    
    IOException - on read error
  - readLong
```
public final long readLong()
                    throws IOException
```
    Reads a signed 64-bit integer from this file. This method reads eight bytes from the file. If the bytes read, in order, are b1, b2, b3, b4, b5, b6, b7, and b8, where:
    then the result is equal to:
    ((long) b1 << 56) + ((long) b2 << 48) + ((long) b3 << 40) + ((long) b4 << 32) + ((long) b5 << 24) + ((long) b6 << 16) + ((long) b7 << 8) + b8
    This method blocks until the eight bytes are read, the end of the stream is detected, or an exception is thrown.
    Specified by:
    
    readLong in interface DataInput
    
    Returns:
    
    the next eight bytes of this file, interpreted as a long.
    
    Throws:
    
    EOFException - if this file reaches the end before reading eight bytes.
    
    IOException - if an I/O error occurs.
  - readLong
```
public final void readLong(long[] pa,
                           int start,
                           int n)
                    throws IOException
```
    Read an array of longs
    
    Parameters:
    
    pa - read into this array
    
    start - starting at pa[start]
    
    n - read this many elements
    
    Throws:
    
    IOException - on read error
  - readFloat
```
public final float readFloat()
                      throws IOException
```
    Reads a float from this file. This method reads an int value as if by the readInt method and then converts that int to a float using the intBitsToFloat method in class Float.
    This method blocks until the four bytes are read, the end of the stream is detected, or an exception is thrown.
    
    Specified by:
    
    readFloat in interface DataInput
    
    Returns:
    
    the next four bytes of this file, interpreted as a float.
    
    Throws:
    
    EOFException - if this file reaches the end before reading four bytes.
    
    IOException - if an I/O error occurs.
    
    See Also:
    
    RandomAccessFile.readInt(), Float.intBitsToFloat(int)
  - readFloat
```
public final void readFloat(float[] pa,
                            int start,
                            int n)
                     throws IOException
```
    Read an array of floats
    
    Parameters:
    
    pa - read into this array
    
    start - starting at pa[start]
    
    n - read this many elements
    
    Throws:
    
    IOException - on read error
  - readDouble
```
public final double readDouble()
                        throws IOException
```
    Reads a double from this file. This method reads a long value as if by the readLong method and then converts that long to a double using the longBitsToDouble method in class Double.
    This method blocks until the eight bytes are read, the end of the stream is detected, or an exception is thrown.
    
    Specified by:
    
    readDouble in interface DataInput
    
    Returns:
    
    the next eight bytes of this file, interpreted as a double.
    
    Throws:
    
    EOFException - if this file reaches the end before reading eight bytes.
    
    IOException - if an I/O error occurs.
    
    See Also:
    
    RandomAccessFile.readLong(), Double.longBitsToDouble(long)
  - readDouble
```
public final void readDouble(double[] pa,
                             int start,
                             int n)
                      throws IOException
```
    Read an array of doubles
    
    Parameters:
    
    pa - read into this array
    
    start - starting at pa[start]
    
    n - read this many elements
    
    Throws:
    
    IOException - on read error
  - readLine
```
public final String readLine()
                      throws IOException
```
    Reads the next line of text from this file. This method successively reads bytes from the file, starting at the current file pointer, until it reaches a line terminator or the end of the file. Each byte is converted into a character by taking the byte's value for the lower eight bits of the character and setting the high eight bits of the character to zero. This method does not, therefore, support the full Unicode character set.
    A line of text is terminated by a carriage-return character ('\r'), a newline character ('\n'), a carriage-return character immediately followed by a newline character, or the end of the file. Line-terminating characters are discarded and are not included as part of the string returned.
    This method blocks until a newline character is read, a carriage return and the byte following it are read (to see if it is a newline), the end of the file is reached, or an exception is thrown.
    
    Specified by:
    
    readLine in interface DataInput
    
    Returns:
    
    the next line of text from this file, or null if end of file is encountered before even one byte is read.
    
    Throws:
    
    IOException - if an I/O error occurs.
  - readUTF
```
public final String readUTF()
                     throws IOException
```
    Reads in a string from this file. The string has been encoded using a modified UTF-8 format.
    The first two bytes are read as if by readUnsignedShort. This value gives the number of following bytes that are in the encoded string, not the length of the resulting string. The following bytes are then interpreted as bytes encoding characters in the UTF-8 format and are converted into characters.
    This method blocks until all the bytes are read, the end of the stream is detected, or an exception is thrown.
    
    Specified by:
    
    readUTF in interface DataInput
    
    Returns:
    
    a Unicode string.
    
    Throws:
    
    EOFException - if this file reaches the end before reading all the bytes.
    
    IOException - if an I/O error occurs.
    
    UTFDataFormatException - if the bytes do not represent valid UTF-8 encoding of a Unicode string.
    
    See Also:
    
    RandomAccessFile.readUnsignedShort()
  - readString
```
public String readString(int nbytes)
                  throws IOException
```
    Read a String of known length.
    
    Parameters:
    
    nbytes - number of bytes to read
    
    Returns:
    
    String wrapping the bytes.
    
    Throws:
    
    IOException - if an I/O error occurs.
  - readString
```
public String readString(int nbytes,
                         Charset charset)
                  throws IOException
```
    Read a String of known length.
    
    Parameters:
    
    nbytes - number of bytes to reSad
    
    charset - the charset to be used to decode the bytes
    
    Returns:
    
    String wrapping the bytes.
    
    Throws:
    
    IOException - if an I/O error occurs.
  - readStringMax
```
public String readStringMax(int nbytes)
                     throws IOException
```
    Read a String of max length, zero terminate.
    
    Parameters:
    
    nbytes - number of bytes to read
    
    Returns:
    
    String wrapping the bytes.
    
    Throws:
    
    IOException - if an I/O error occurs.
  - readStringMax
```
public String readStringMax(int nbytes,
                            Charset charset)
                     throws IOException
```
    Read a String of max length, zero terminate.
    
    Parameters:
    
    nbytes - number of bytes to read
    
    charset - the charset to be used to decode the bytes
    
    Returns:
    
    String wrapping the bytes.
    
    Throws:
    
    IOException - if an I/O error occurs.
  - writeBoolean
```
public final void writeBoolean(boolean v)
                        throws IOException
```
    Writes a boolean to the file as a 1-byte value. The value true is written out as the value (byte)1; the value false is written out as the value (byte)0.
    
    Specified by:
    
    writeBoolean in interface DataOutput
    
    Parameters:
    
    v - a boolean value to be written.
    
    Throws:
    
    IOException - if an I/O error occurs.
  - writeBoolean
```
public final void writeBoolean(boolean[] pa,
                               int start,
                               int n)
                        throws IOException
```
    Write an array of booleans
    
    Parameters:
    
    pa - write from this array
    
    start - starting with this element in the array
    
    n - write this number of elements
    
    Throws:
    
    IOException - on read error
  - writeByte
```
public final void writeByte(int v)
                     throws IOException
```
    Writes a byte to the file as a 1-byte value.
    
    Specified by:
    
    writeByte in interface DataOutput
    
    Parameters:
    
    v - a byte value to be written.
    
    Throws:
    
    IOException - if an I/O error occurs.
  - writeShort
```
public final void writeShort(int v)
                      throws IOException
```
    Writes a short to the file as two bytes, high byte first.
    
    Specified by:
    
    writeShort in interface DataOutput
    
    Parameters:
    
    v - a short to be written.
    
    Throws:
    
    IOException - if an I/O error occurs.
  - writeShort
```
public final void writeShort(short[] pa,
                             int start,
                             int n)
                      throws IOException
```
    Write an array of shorts
    
    Parameters:
    
    pa - write from this array
    
    start - starting with this element in the array
    
    n - this number of elements
    
    Throws:
    
    IOException - on read error
  - writeChar
```
public final void writeChar(int v)
                     throws IOException
```
    Writes a char to the file as a 2-byte value, high byte first.
    
    Specified by:
    
    writeChar in interface DataOutput
    
    Parameters:
    
    v - a char value to be written.
    
    Throws:
    
    IOException - if an I/O error occurs.
  - writeChar
```
public final void writeChar(char[] pa,
                            int start,
                            int n)
                     throws IOException
```
    Write an array of chars
    
    Parameters:
    
    pa - write from this array
    
    start - starting with this element in the array
    
    n - this number of elements
    
    Throws:
    
    IOException - on read error
  - writeInt
```
public final void writeInt(int v)
                    throws IOException
```
    Writes an int to the file as four bytes, high byte first.
    
    Specified by:
    
    writeInt in interface DataOutput
    
    Parameters:
    
    v - an int to be written.
    
    Throws:
    
    IOException - if an I/O error occurs.
  - writeInt
```
public final void writeInt(int[] pa,
                           int start,
                           int n)
                    throws IOException
```
    Write an array of ints
    
    Parameters:
    
    pa - write from this array
    
    start - starting with this element in the array
    
    n - write this number of elements
    
    Throws:
    
    IOException - on read error
  - writeLong
```
public final void writeLong(long v)
                     throws IOException
```
    Writes a long to the file as eight bytes, high byte first.
    
    Specified by:
    
    writeLong in interface DataOutput
    
    Parameters:
    
    v - a long to be written.
    
    Throws:
    
    IOException - if an I/O error occurs.
  - writeLong
```
public final void writeLong(long[] pa,
                            int start,
                            int n)
                     throws IOException
```
    Write an array of longs
    
    Parameters:
    
    pa - write from this array
    
    start - starting with this element in the array
    
    n - write this number of elements
    
    Throws:
    
    IOException - on read error
  - writeFloat
```
public final void writeFloat(float v)
                      throws IOException
```
    Converts the float argument to an int using the floatToIntBits method in class Float, and then writes that int value to the file as a 4-byte quantity, high byte first.
    
    Specified by:
    
    writeFloat in interface DataOutput
    
    Parameters:
    
    v - a float value to be written.
    
    Throws:
    
    IOException - if an I/O error occurs.
    
    See Also:
    
    Float.floatToIntBits(float)
  - writeFloat
```
public final void writeFloat(float[] pa,
                             int start,
                             int n)
                      throws IOException
```
    Write an array of floats
    
    Parameters:
    
    pa - write from this array
    
    start - starting with this element in the array
    
    n - write this number of elements
    
    Throws:
    
    IOException - on read error
  - writeDouble
```
public final void writeDouble(double v)
                       throws IOException
```
    Converts the double argument to a long using the doubleToLongBits method in class Double, and then writes that long value to the file as an 8-byte quantity, high byte first.
    
    Specified by:
    
    writeDouble in interface DataOutput
    
    Parameters:
    
    v - a double value to be written.
    
    Throws:
    
    IOException - if an I/O error occurs.
    
    See Also:
    
    Double.doubleToLongBits(double)
  - writeDouble
```
public final void writeDouble(double[] pa,
                              int start,
                              int n)
                       throws IOException
```
    Write an array of doubles
    
    Parameters:
    
    pa - write from this array
    
    start - starting with this element in the array
    
    n - write this number of elements
    
    Throws:
    
    IOException - on read error
  - writeBytes
```
public final void writeBytes(String s)
                      throws IOException
```
    Writes the string to the file as a sequence of bytes. Each character in the string is written out, in sequence, by discarding its high eight bits.
    
    Specified by:
    
    writeBytes in interface DataOutput
    
    Parameters:
    
    s - a string of bytes to be written.
    
    Throws:
    
    IOException - if an I/O error occurs.
  - writeBytes
```
public final void writeBytes(char[] b,
                             int off,
                             int len)
                      throws IOException
```
    Writes the character array to the file as a sequence of bytes. Each character in the string is written out, in sequence, by discarding its high eight bits.
    
    Parameters:
    
    b - a character array of bytes to be written.
    
    off - the index of the first character to write.
    
    len - the number of characters to write.
    
    Throws:
    
    IOException - if an I/O error occurs.
  - writeChars
```
public final void writeChars(String s)
                      throws IOException
```
    Writes a string to the file as a sequence of characters. Each character is written to the data output stream as if by the writeChar method.
    
    Specified by:
    
    writeChars in interface DataOutput
    
    Parameters:
    
    s - a String value to be written.
    
    Throws:
    
    IOException - if an I/O error occurs.
    
    See Also:
    
    RandomAccessFile.writeChar(int)
  - writeUTF
```
public final void writeUTF(String str)
                    throws IOException
```
    Writes a string to the file using UTF-8 encoding in a machine-independent manner.
    First, two bytes are written to the file as if by the writeShort method giving the number of bytes to follow. This value is the number of bytes actually written out, not the length of the string. Following the length, each character of the string is output, in sequence, using the UTF-8 encoding for each character.
    
    Specified by:
    
    writeUTF in interface DataOutput
    
    Parameters:
    
    str - a string to be written.
    
    Throws:
    
    IOException - if an I/O error occurs.
  - toString
```
public String toString()
```
    Create a string representation of this object.
    
    Overrides:
    
    toString in class Object
    
    Returns:
    
    a string representation of the state of the object.
  - searchForward
```
public boolean searchForward(KMPMatch match,
                             int maxBytes)
                      throws IOException
```
    Search forward from the current pos, looking for a match.
    
    Parameters:
    
    match - the match to look for.
    
    maxBytes - maximum number of bytes to search. use -1 for all
    
    Returns:
    
    true if found, file position will be at the start of the match.
    
    Throws:
    
    IOException - on read error

Class RandomAccessFile

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

BIG_ENDIAN

LITTLE_ENDIAN

Constructor Detail

RandomAccessFile

RandomAccessFile

Method Detail

getDebugLeaks

setDebugLeaks

getOpenFiles

getOpenFileCount

getMaxOpenFileCount

getAllFiles

setDebugAccess

getDebugNseeks

getDebugNbytes

enableDefaultGlobalFileCache

setGlobalFileCache

getGlobalFileCache

acquire

acquire

eject

shutdown

getRandomAccessFile

setBufferSize

getBufferSize

close

release

reacquire

setFileCache

getLastModified

isAtEndOfFile

seek

getFilePointer

getLocation

length

order

order

flush

setMinLength

setExtendMode

read

readBytes

readToByteChannel

read

read

readBytes

readFully

readFully

skipBytes

skipBytes

unread

write

writeBytes

write

write

readBoolean

readByte

readUnsignedByte

readShort

readShort

readUnsignedShort

readChar

readInt

readIntUnbuffered

readInt

readLong

readLong

readFloat

readFloat

readDouble

readDouble

readLine

readUTF

readString