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
public class LeftFunction
- extends Object
- implements JepFunction
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 $
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
LeftFunction
public LeftFunction()
getFunctionName
public String getFunctionName()
- Description copied from interface:
JepFunction
- Get the name of this function. It is used when registering the
function with a
JEP
parser.
- Specified by:
getFunctionName
in interface JepFunction
- Returns:
- The string "left"
- See Also:
JEP.addFunction(String, PostfixMathCommandI)
getNumberOfParameters
public int getNumberOfParameters()
- Specified by:
getNumberOfParameters
in interface org.nfunk.jep.function.PostfixMathCommandI
- Returns:
- Always 2
setCurNumberOfParameters
public void setCurNumberOfParameters(int n)
- Specified by:
setCurNumberOfParameters
in interface org.nfunk.jep.function.PostfixMathCommandI
checkNumberOfParameters
public boolean checkNumberOfParameters(int n)
- Specified by:
checkNumberOfParameters
in interface org.nfunk.jep.function.PostfixMathCommandI
run
public void run(Stack stack)
throws ParseException
- Specified by:
run
in interface org.nfunk.jep.function.PostfixMathCommandI
- Throws:
ParseException