Implement 'instanceOf' as a parameter check

[bobalicious]

Implement the ability to check if a parameter is an instance of a given object.

For example, something along the lines of:

Amoss_Instance objectController = new Amoss_Instance( SomeClass.class );
objectController
  .expects( 'thisMethod' )
  .withParameterNamed( 'parameter1' ).instanceOf( AnotherClass.class ) 

OR

Amoss_Instance objectController = new Amoss_Instance( SomeClass.class );
objectController
  .expects( 'thisMethod' )
  .withParameterNamed( 'parameter1' ).instanceOf( Contact.class )

[bobalicious]

Can't see how this would work, since can't see how to check the instance of an object against a dynamic (variable driven) type.

For example, the following does not work:

Sobject con = new Contact();
Type conType = Contact.class;
System.debug( con instanceOf conType );

Have asked Stack for help, just in case:

• https://salesforce.stackexchange.com/questions/337824/can-you-check-the-instanceof-an-object-dynamically

Without this capability it doesn't seem possible.

Potentially, it could use a JSON hack to do it. I.E. check if the object can be serialised and deserialised via that type, but it feels fragile. E.g.

• https://salesforce.stackexchange.com/questions/151140/check-if-object-instance-is-of-type-x

[robcowell]

I have a similar need and haven't got much past this kind of thing

public static string getType(Object o) {
        if(o==null) {return '';}              // we can't say much about null with our current techniques
        if(o instanceof SObject)            {return ((SObject)o).getSObjectType().getDescribe().getName()+''; }
        if(o instanceof Boolean)            {return 'Boolean';}
        if(o instanceof Id)                 {return 'Id';}
        if(o instanceof String)             {return 'String';}
        if(o instanceof Blob)               {return 'Blob';}
        if(o instanceof Date)               {return 'Date';}
        if(o instanceof Datetime)           {return 'Datetime';}
        if(o instanceof Time)               {return 'Time';}
        if(o instanceof Integer)            {return 'Integer';}
        if(o instanceof Long)               {return 'Long';}
        if(o instanceof Decimal)            {return 'Decimal';}
        if(o instanceof Double)             {return 'Double';}
        if(o instanceof List<object>)       {return 'List';}
        return 'Object';                    // actually we can't detect maps and sets and maps
      }