Class FormatIdUtil
- java.lang.Object
-
- org.apache.derby.iapi.services.io.FormatIdUtil
-
public final class FormatIdUtil extends java.lang.Object
Utility class with static methods for constructing and reading the byte array representation of format id's.This utility supports a number of families of format ids. The byte array form of each family is a different length. In all cases the first two bits of the first byte indicate the family for an id. The list below describes each family and gives its two bit identifier in parens.
- (0) - The format id is a one byte number between 0 and 63 inclusive. The byte[] encoding fits in one byte.
- (1) - The format id is a two byte number between 16384 to 32767 inclusive. The byte[] encoding stores the high order byte first.
- (2) - The format id is four byte number between 2147483648 and 3221225471 inclusive. The byte[] encoding stores the high order byte first.
- (3) - Future expansion.
-
-
Constructor Summary
Constructors Modifier Constructor Description private
FormatIdUtil()
-
Method Summary
All Methods Static Methods Concrete Methods Modifier and Type Method Description static java.lang.String
formatIdToString(int fmtId)
static int
getFormatIdByteLength(int formatId)
static int
readFormatIdInteger(byte[] data)
static int
readFormatIdInteger(java.io.DataInput in)
static void
writeFormatIdInteger(java.io.DataOutput out, int formatId)
-
-
-
Method Detail
-
getFormatIdByteLength
public static int getFormatIdByteLength(int formatId)
-
writeFormatIdInteger
public static void writeFormatIdInteger(java.io.DataOutput out, int formatId) throws java.io.IOException
- Throws:
java.io.IOException
-
readFormatIdInteger
public static int readFormatIdInteger(java.io.DataInput in) throws java.io.IOException
- Throws:
java.io.IOException
-
readFormatIdInteger
public static int readFormatIdInteger(byte[] data)
-
formatIdToString
public static java.lang.String formatIdToString(int fmtId)
-
-