Package edu.uiuc.ncsa.qdl.extensions.example

Class Concat

java.lang.Object

edu.uiuc.ncsa.qdl.extensions.example.Concat

All Implemented Interfaces:

QDLFunction, Serializable

public class Concat
extends Object
implements QDLFunction

Created by Jeff Gaynor
on 1/27/20 at 1:24 PM

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor	Description
Concat()

Method Summary

Modifier and Type	Method	Description
Object	evaluate(Object[] objects, State state)	The method that is invoked by QDL.
int[]	getArgCount()	The contract is that when QDL invokes this method, it will faithfully give all of the arguments as an array of Objects.
List<String>	getDocumentation(int argCount)	Return documentation to be displayed in the workspace.
String	getName()	The name of this function as you want it invoked in QDL.

Methods inherited from class java.lang.Object

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

Constructor Detail

Concat

public Concat()

Method Detail

getName

public String getName()

Description copied from interface: QDLFunction

The name of this function as you want it invoked in QDL.

Specified by:

getName in interface QDLFunction

Returns:

getArgCount

public int[] getArgCount()

Description copied from interface: QDLFunction

The contract is that when QDL invokes this method, it will faithfully give all of the arguments as an array of Objects. Overloading is not possible in QDL (it is weakly typed) except by argument count, so if this is called "foo" and you have versions with 3 and 4 arguments, then f(a,b,c) would be executed with the arguments passed. To achieve overloading for Java methods, have the number of arguments this accepts as the elements of the array. So if this has a value of [1,2,3] then this function will be invoked if called with 1, 2 or 3 arguments and an error will be raised, if, say, 4 are passed.

Specified by:

getArgCount in interface QDLFunction

Returns:

evaluate

public Object evaluate(Object[] objects,
                       State state)

Description copied from interface: QDLFunction

The method that is invoked by QDL. It will have the arguments evaluated and put in to the array of objects. It is up to you to do any checking you see fit. State is supplied if needed.

Specified by:

evaluate in interface QDLFunction

Returns:

getDocumentation

public List<String> getDocumentation(int argCount)

Description copied from interface: QDLFunction

Return documentation to be displayed in the workspace. Short version displays the first line (element of the list) so make sure that is informative. The long version should contain details of use.

Specified by:

getDocumentation in interface QDLFunction

Returns: