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Java Source Code / Java Documentation » Database DBMS » db derby 10.2 » org.apache.derby.iapi.services.io 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   org.apache.derby.iapi.services.io.CompressedNumber

CompressedNumber
abstract public class CompressedNumber (Code)
Static methods to write and read compressed forms of numbers to DataOut and DataIn interfaces. Format written is platform independent like the Data* interfaces and must remain fixed once a product is shipped. If a different format is required then write a new set of methods, e.g. writeInt2. The formats defined by stored format identifiers are implicitly dependent on these formats not changing.


Field Summary
final public static  intMAX_COMPRESSED_INT_ONE_BYTE
    
final public static  intMAX_COMPRESSED_INT_TWO_BYTES
    
final public static  intMAX_INT_STORED_SIZE
    
final public static  intMAX_LONG_STORED_SIZE
    


Method Summary
public static  voidmain(String[] args)
    
final public static  intreadInt(DataInput in)
     Read an integer previously written by writeInt().
final public static  intreadInt(InputStream in)
     Read an integer previously written by writeInt().
final public static  intreadInt(byte[] data, int offset)
    
final public static  intreadIntAndReturnIntPlusOverhead(byte[] data, int offset)
     Return the compressed Int value + stored size of the length + 1

Given offset in array to beginning of compressed int, return the value of the compressed int + the number of bytes used to store the length.

So 1 byte lengths will return: length + 1 + 1 So 2 byte lengths will return: length + 2 + 1 So 4 byte lengths will return: length + 4 + 1

Note that this routine will not work for lengths MAX_INT - (MAX_INT - 5).

This routine is currently used by the StorePage code to skip fields as efficiently as possible.

final public static  longreadLong(DataInput in)
     Read a long previously written by writeLong().
final public static  longreadLong(InputStream in)
     Read a long previously written by writeLong().
final public static  longreadLong(byte[] data, int offset)
    
final public static  intsizeInt(int value)
    
final public static  intsizeLong(long value)
    
final public static  intskipInt(DataInput in)
     Skip an integer previously written by writeInt().
final public static  intskipInt(InputStream in)
     Skip an integer previously written by writeInt().
final public static  intskipLong(DataInput in)
     Skip a long previously written by writeLong().
final public static  intskipLong(InputStream in)
     Skip a long previously written by writeLong().
final public static  intwriteInt(DataOutput out, int value)
     Write a compressed integer only supporting signed values.
final public static  intwriteInt(OutputStream out, int value)
     Write a compressed integer directly to an OutputStream.
final public static  intwriteLong(DataOutput out, long value)
     Write a compressed long only supporting signed values.
final public static  intwriteLong(OutputStream out, long value)
     Write a compressed integer only supporting signed values.

Field Detail
MAX_COMPRESSED_INT_ONE_BYTE
final public static int MAX_COMPRESSED_INT_ONE_BYTE(Code)


MAX_COMPRESSED_INT_TWO_BYTES
final public static int MAX_COMPRESSED_INT_TWO_BYTES(Code)


MAX_INT_STORED_SIZE
final public static int MAX_INT_STORED_SIZE(Code)


MAX_LONG_STORED_SIZE
final public static int MAX_LONG_STORED_SIZE(Code)




Method Detail
main
public static void main(String[] args) throws IOException(Code)


readInt
final public static int readInt(DataInput in) throws IOException(Code)
Read an integer previously written by writeInt().
exception:
  IOException - an exception was thrown by a method on in.


readInt
final public static int readInt(InputStream in) throws IOException(Code)
Read an integer previously written by writeInt().
exception:
  IOException - an exception was thrown by a method on in.


readInt
final public static int readInt(byte[] data, int offset)(Code)


readIntAndReturnIntPlusOverhead
final public static int readIntAndReturnIntPlusOverhead(byte[] data, int offset)(Code)
Return the compressed Int value + stored size of the length + 1

Given offset in array to beginning of compressed int, return the value of the compressed int + the number of bytes used to store the length.

So 1 byte lengths will return: length + 1 + 1 So 2 byte lengths will return: length + 2 + 1 So 4 byte lengths will return: length + 4 + 1

Note that this routine will not work for lengths MAX_INT - (MAX_INT - 5).

This routine is currently used by the StorePage code to skip fields as efficiently as possible. Since the page size is less than (MAX_INT - 5) it is all right to use this routine. compressed int value + length used to store the length.
Parameters:
  data - byte array containing the field.
Parameters:
  offset - offset to beginning of field, ie. data[offset] contains1st byte of the compressed int.



readLong
final public static long readLong(DataInput in) throws IOException(Code)
Read a long previously written by writeLong().
exception:
  IOException - an exception was thrown by a method on in.


readLong
final public static long readLong(InputStream in) throws IOException(Code)
Read a long previously written by writeLong().
exception:
  IOException - an exception was thrown by a method on in.


readLong
final public static long readLong(byte[] data, int offset)(Code)


sizeInt
final public static int sizeInt(int value)(Code)
Return the number of bytes that would be written by a writeInt call


sizeLong
final public static int sizeLong(long value)(Code)


skipInt
final public static int skipInt(DataInput in) throws IOException(Code)
Skip an integer previously written by writeInt().
exception:
  IOException - an exception was thrown by a method on in.


skipInt
final public static int skipInt(InputStream in) throws IOException(Code)
Skip an integer previously written by writeInt().
exception:
  IOException - an exception was thrown by a method on in.


skipLong
final public static int skipLong(DataInput in) throws IOException(Code)
Skip a long previously written by writeLong().
exception:
  IOException - an exception was thrown by a method on in.


skipLong
final public static int skipLong(InputStream in) throws IOException(Code)
Skip a long previously written by writeLong().
exception:
  IOException - an exception was thrown by a method on in.


writeInt
final public static int writeInt(DataOutput out, int value) throws IOException(Code)
Write a compressed integer only supporting signed values. Formats are (with x representing value bits): 
 1 Byte - 00xxxxxx                              Represents the value <= 63 (0x3f)
 2 Byte - 01xxxxxx xxxxxxxx                     Represents the value > 63 && <= 16383 (0x3fff)
 4 byte - 1xxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx   Represents the value > 16383 && <= MAX_INT

exception:
  IOException - value is negative or an exception was thrown by a method on out.


writeInt
final public static int writeInt(OutputStream out, int value) throws IOException(Code)
Write a compressed integer directly to an OutputStream.
exception:
  IOException - an exception was thrown by a method on in.


writeLong
final public static int writeLong(DataOutput out, long value) throws IOException(Code)
Write a compressed long only supporting signed values. Formats are (with x representing value bits): 
 2 byte - 00xxxxxx xxxxxxxx                     Represents the value <= 16383 (0x3fff)
 4 byte - 01xxxxxx xxxxxxxx xxxxxxxx xxxxxxxx   Represents the value > 16383  && <= 0x3fffffff
 8 byte - 1xxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx   Represents the value > 0x3fffffff && <= MAX_LONG

exception:
  IOException - value is negative or an exception was thrown by a method on out.


writeLong
final public static int writeLong(OutputStream out, long value) throws IOException(Code)
Write a compressed integer only supporting signed values.
exception:
  IOException - value is negative or an exception was thrown by a method on out.


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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