com.singularsys.jep.functions.strings
Class Left

java.lang.Object
  com.singularsys.jep.functions.PostfixMathCommand
      com.singularsys.jep.functions.BinaryFunction
          com.singularsys.jep.functions.strings.Left

All Implemented Interfaces:

PostfixMathCommandI, java.io.Serializable

public class Left
extends BinaryFunction

Extract the left most n characters from a string: left("abcdefg",2) -> "ab"

• If n is greater than the length of the string return the full string.
• If n is less than zero an EvaluationException is thrown.
• If the first argument is not a string an EvaluationException is thrown.

If the second argument is not a number representing an integer an EvaluationException is thrown.

See Also:

Serialized Form

Field Summary

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

curNumberOfParameters, name, NaN, numberOfParameters

Constructor Summary

Left()

Method Summary

java.lang.Object

eval(java.lang.Object l, java.lang.Object r)

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

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

Left

public Left()

Method Detail

eval

public java.lang.Object eval(java.lang.Object l,
                             java.lang.Object r)
                      throws EvaluationException

Specified by:

eval in class BinaryFunction

Throws:

EvaluationException