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java.lang.Objectorg.basex.io.DataAccess
public final class DataAccess
This class allows positional read and write access to a database file.
Constructor Summary | |
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DataAccess(File f)
Constructor, initializing the file reader. |
Method Summary | |
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void |
close()
Closes the data access. |
org.basex.io.Buffer |
cursor(long p)
Sets the disk cursor. |
void |
flush()
Flushes the buffered data. |
long |
length()
Returns file length. |
boolean |
more()
Checks if more bytes can be read. |
long |
pos()
Returns the current file position. |
byte |
read1()
Reads a byte value. |
int |
read4()
Reads an integer value. |
int |
read4(long p)
Reads an integer value from the specified position. |
long |
read5()
Reads a 5-byte value. |
long |
read5(long p)
Reads a 5-byte value from the specified file offset. |
byte[] |
readBytes(long from,
long to)
Reads a number of bytes in range from -> to and returns them as array. |
int |
readNum()
Reads the next compressed number and returns it as integer. |
int |
readNum(long p)
Reads a Num value from disk. |
byte[] |
readToken(long p)
Reads a token from disk. |
void |
writeBytes(long p,
byte[] v)
Appends a value to the file and return it's offset. |
void |
writeInt(int v)
Writes an integer value to the specified output stream. |
Methods inherited from class java.lang.Object |
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equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public DataAccess(File f) throws IOException
f
- the file to be read
IOException
- IO ExceptionMethod Detail |
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public void flush() throws IOException
IOException
- I/O exceptionpublic void close() throws IOException
IOException
- I/O exceptionpublic long pos()
public long length()
public boolean more()
public byte read1()
public int read4()
public int read4(long p)
p
- position
public long read5(long p)
p
- position
public long read5()
public int readNum(long p)
Num
value from disk.
p
- text position
public byte[] readToken(long p)
p
- text position
public byte[] readBytes(long from, long to)
from
- starting position for readingto
- ending position for reading
public void writeBytes(long p, byte[] v)
p
- write positionv
- byte array to be appendedpublic org.basex.io.Buffer cursor(long p)
p
- read position
public int readNum()
public void writeInt(int v)
v
- value to be written
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