Class Mid
- java.lang.Object
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- com.singularsys.jep.functions.PostfixMathCommand
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- com.singularsys.jep.functions.NaryFunction
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- com.singularsys.jep.functions.strings.Mid
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- All Implemented Interfaces:
PostfixMathCommandI
,java.io.Serializable
public class Mid extends NaryFunction
Extract substring of first argument:mid("abcdefg",2,3) -> "cde"
Syntax:mid(str,start,len)
Second argument is starting index, with the first character being at index 0. Third argument is number of characters to return. Note this differs from Excel's mid function which has 1 as the index of the first character.- If
start
is greater than the length of the string an EvaluationException is thrown. - If
start
is less than zero an EvaluationException is thrown. - If
len
is less than zero an EvaluationException is thrown. - If
start+len
is greater than the length of the string return all characters from start. - If
str
is not a string an EvaluationException is thrown. - If
start
is not a number representing an integer an EvaluationException is thrown. - If
end
is not a number representing an integer an EvaluationException is thrown.
- See Also:
String.substring(int, int)
, Serialized Form
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Field Summary
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Fields inherited from class com.singularsys.jep.functions.PostfixMathCommand
curNumberOfParameters, name, NaN, numberOfParameters
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Constructor Summary
Constructors Constructor Description Mid()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description java.lang.Object
eval(java.lang.Object[] args)
Evaluate the function-
Methods inherited from class com.singularsys.jep.functions.NaryFunction
run
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Methods inherited from class com.singularsys.jep.functions.PostfixMathCommand
asArray, asBool, asDouble, asInt, asLong, asStrictInt, asString, checkNumberOfParameters, getName, getNumberOfParameters, setCurNumberOfParameters, setName, toString, toString
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Method Detail
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eval
public java.lang.Object eval(java.lang.Object[] args) throws EvaluationException
Description copied from class:NaryFunction
Evaluate the function- Specified by:
eval
in classNaryFunction
- Parameters:
args
- arguments to the function- Returns:
- value returned by the function
- Throws:
EvaluationException
- if the calculation cannot be performed
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