com.singularsys.jep.functions.strings
Class Mid

java.lang.Object
  com.singularsys.jep.functions.PostfixMathCommand
      com.singularsys.jep.functions.NaryFunction
          com.singularsys.jep.functions.strings.Mid

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 Third argument is number of characters to return.

• 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

Field Summary

Fields inherited from class com.singularsys.jep.functions.PostfixMathCommand

curNumberOfParameters, name, NaN, numberOfParameters

Constructor Summary

Mid()

Method Summary

java.lang.Object

eval(java.lang.Object[] args) Evaluate the function

Methods inherited from class com.singularsys.jep.functions.NaryFunction

run

Methods inherited from class com.singularsys.jep.functions.PostfixMathCommand

asArray, asBool, asDouble, asInt, asLong, asStrictInt, asString, checkNumberOfParameters, checkStack, getName, getNumberOfParameters, setCurNumberOfParameters, setName, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Mid

public Mid()

Method Detail

eval

public java.lang.Object eval(java.lang.Object[] args)
                      throws EvaluationException

Description copied from class: NaryFunction

Evaluate the function

Specified by:

eval in class NaryFunction

Parameters:

args - arguments to the function

Returns:

value returned by the function

Throws:

EvaluationException