net.obvj.jep.functions

Class IsEmpty

java.lang.Object

org.nfunk.jep.function.PostfixMathCommand

net.obvj.jep.functions.IsEmpty

All Implemented Interfaces:

org.nfunk.jep.function.PostfixMathCommandI

public class IsEmpty
extends org.nfunk.jep.function.PostfixMathCommand

A function that returns 1 if the given parameter is either an empty String, JSON or Collection, or 0 if not.

Strings that can be parsed as JSON objects or JSON arrays, will be first converted into JSON, then its structure will be evaluated for emptiness. For example, the following strings will be evaluated as empty objects:

• "" (an empty string)
• "{}" (an empty JSON object)
• "[]" (an empty JSON array)

Author:

oswaldo.bapvic.jr

Constructor Summary

Constructors

Constructor and Description
IsEmpty() Builds this custom command with a fixed number of 1 parameter

Method Summary

Modifier and Type	Method and Description
void	run(Stack stack)

Methods inherited from class org.nfunk.jep.function.PostfixMathCommand

checkNumberOfParameters, getNumberOfParameters, setCurNumberOfParameters

Methods inherited from class java.lang.Object

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

Constructor Detail

IsEmpty

public IsEmpty()

Builds this custom command with a fixed number of 1 parameter

Method Detail

run

public void run(Stack stack)
         throws org.nfunk.jep.ParseException

Specified by:

run in interface org.nfunk.jep.function.PostfixMathCommandI

Overrides:

run in class org.nfunk.jep.function.PostfixMathCommand

Throws:

org.nfunk.jep.ParseException

See Also:

Comparative.run(java.util.Stack)