Package net.sf.basedb.util.jep
Class LeftFunction
java.lang.Object
net.sf.basedb.util.jep.LeftFunction
- All Implemented Interfaces:
JepFunction
,org.nfunk.jep.function.PostfixMathCommandI
Adds a
left(string, index|string)
function to Jep. It is used to
cut out the leftmost characters of a string. If the second argument is a
number, the string is cut with String.substring(int, int)
with 0 as
the first argument. If the second argument is a string, the position
of that string is looked up in the first string and is used as an index.
Example:
left('foo:bar', 3) == 'foo' left('foo:bar', ':') == 'foo')If the second variant is used and the second string is not found within the first, the first string is returned unmodified.
- Since:
- 3.0
- Author:
- nicklas
- Last modified
- $Date $
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Constructor Summary
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Method Summary
Modifier and TypeMethodDescriptionboolean
checkNumberOfParameters
(int n) Get the name of this function.int
void
void
setCurNumberOfParameters
(int n)
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Constructor Details
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LeftFunction
public LeftFunction()
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Method Details
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getFunctionName
Description copied from interface:JepFunction
Get the name of this function. It is used when registering the function with aJEP
parser.- Specified by:
getFunctionName
in interfaceJepFunction
- Returns:
- The string "left"
- See Also:
-
getNumberOfParameters
public int getNumberOfParameters()- Specified by:
getNumberOfParameters
in interfaceorg.nfunk.jep.function.PostfixMathCommandI
- Returns:
- Always 2
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setCurNumberOfParameters
public void setCurNumberOfParameters(int n) - Specified by:
setCurNumberOfParameters
in interfaceorg.nfunk.jep.function.PostfixMathCommandI
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checkNumberOfParameters
public boolean checkNumberOfParameters(int n) - Specified by:
checkNumberOfParameters
in interfaceorg.nfunk.jep.function.PostfixMathCommandI
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run
- Specified by:
run
in interfaceorg.nfunk.jep.function.PostfixMathCommandI
- Throws:
ParseException
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