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EDT:EGL Language Primitive Type Conversions

Revision as of 12:29, 7 July 2011 by Mheitz.us.ibm.com (Talk | contribs) (New page: Please see the parent of this page, EDT:EGL_Language. == Conversions Between Primitive Types (Table 4) == === Conversion Matrix === Rows = from type, columns = to type {| cellsp...)

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Please see the parent of this page, EDT:EGL_Language.

Conversions Between Primitive Types (Table 4)

Conversion Matrix

Rows = from type, columns = to type


bigint
boolean
bytes
decimal
float
  int 
number
smallfloat
smallint
string
timestamp
bigint
a

g
f
f
f
f
f
f
d

boolean

a







b

bytes
g

a
g
g
g
g
g
g


decimal
f

g
a
f
f
f
f
f
d

float
f

g
f
a
f
f
f
f
d

int
f

g
f
f
a
f
f
f
d

number
f

g
f
f
f
a
f
f
d

smallfloat
f

g
f
f
f
f
a
f
d

smallint
f

g
f
f
f
f
f
a
d

string
d

e
d
d
d
d
d
d
a
c
timestamp









c
a

blank = The types are incompatible.  Conversion is not supported.

a = Same types (not a conversion.

b = Booleans convert to strings as "true" or "false" (lowercase).

c = Strings convert to/from timestamps using a predefined format for timestamps (to be defined later), the required fields come from the timestamp's pattern.   The conversions are not controlled by variables like RBD's defaultTimestampFormat.  Because of this, we can't convert from a string to a timestamp with no pattern.  We can convert from a timestamp with no pattern to a string.  Functions will be provided which convert to/from strings and timestamps with a format string supplied by the program.

d = Strings convert to/from numbers using our literal syntax for numbers.  The conversions are not controlled by variables like RBD's defaultNumericFormat.  Functions will be provided which convert to/from strings and numbers with a format string supplied by the program.

e = Strings convert to bytes using the bit pattern of the Unicode characters in the string.

f = All numeric types are compatible with each other, but some conversions can result in overflow or truncation.

g = Numeric types convert to/from bytes using the number's bit pattern. When the bytes type includes a size (i.e. "bytes(4)" not just "bytes") the conversion is legal only if the size of the number in bytes equals the length of the bytes type.


Conversions Between Primitive Types1 Core JavaScript Java Debug
Any to everything



Everything to any



Conversion Matrix b



Conversion Matrix c



Conversion Matrix d



Conversion Matrix e



Conversion Matrix f



Conversion Matrix g



Notes on Table 4

  1. We'll document error conditions of conversions, and their resulting exceptions. Whenever possible this documentation will be comments in the EGL source file for a type.

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