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Java Source Code / Java Documentation » Database DBMS » db derby 10.2 » org.apache.derbyTesting.unitTests.util 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   org.apache.derbyTesting.unitTests.util.BitUtil

BitUtil
public class BitUtil (Code)
This class provides utility methods for converting byte arrays to hexidecimal Strings and manipulating BIT/BIT VARYING values as a packed vector of booleans.

The BIT/BIT VARYING methods are modeled after some methods in the java.util.BitSet class. An alternative to using a SQL BIT (VARYING) column in conjunction with the methods provided herein to provide bit manipulation would be to use a serialized java.util.BitSet column instead.

This class contains the following static methods:

  • void set(byte[] bytes, int position) to set a bit
  • void clear(byte[] bytes, int position) to clear a bit
  • boolean get(byte[] bytes, int position) to get the bit status

Since these methods effectively allow a SQL BIT to be considered as an array of booleans, all offsets (position parameters) are zero based. So if you want to set the first bit of a BIT type, you would use set(MyBitColumn, 0) .

Examples:

  • SELECT BitUtil::get(bitcol, 2) FROM mytab
  • UPDATE mytab SET bitcol = BitUtil::set(bitcol, 2)
  • UPDATE mytab SET bitcol = BitUtil::clear(bitcol, 2)




Method Summary
public static  byte[]clear(byte[] bytes, int position)
    
public static  booleanget(byte[] bytes, int position)
    
public static  StringhexDump(byte[] data)
     Convert a byte array to a human-readable String for debugging purposes.
public static  byte[]set(byte[] bytes, int position)
    



Method Detail
clear
public static byte[] clear(byte[] bytes, int position)(Code)
Clear the bit at the specified position
Parameters:
  bytes - the byte array
Parameters:
  position - the bit to clear, starting from zero the byte array with the cleared bit
exception:
  IndexOutOfBoundsException - on bad position



get
public static boolean get(byte[] bytes, int position)(Code)
Check to see if the specified bit is set
Parameters:
  bytes - the byte array
Parameters:
  position - the bit to check, starting from zero true/false
exception:
  IndexOutOfBoundsException - on bad position



hexDump
public static String hexDump(byte[] data)(Code)
Convert a byte array to a human-readable String for debugging purposes.



set
public static byte[] set(byte[] bytes, int position)(Code)
Set the bit at the specified position
Parameters:
  bytes - the byte array
Parameters:
  position - the bit to set, starting from zero the byte array with the set bit
exception:
  IndexOutOfBoundsException - on bad position



Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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