ExpressionFunctionResolver

All Known Implementing Classes:

EnumResolver, MultiResolver
```
public interface ExpressionFunctionResolver
```
Resolver encapsulation for finding a relevant function by name.

Author:

Matthew Tropiano

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`boolean`	`containsFunctionByName(String name)`	Attempts to find if this resolver has a function by its calling name.
`ExpressionFunctionType`	`getFunctionByName(String name)`	Attempts to resolve a pertinent function by its calling name.

- Method Detail
  - containsFunctionByName
```
boolean containsFunctionByName(String name)
```
    Attempts to find if this resolver has a function by its calling name.
    Names must be resolved case-insensitively!
    If this returns true for a function name, getFunctionByName(String) must NOT return null if called with that name!
    
    Parameters:
    
    name - the name to find.
    
    Returns:
    
    a corresponding function or null for no such function.
  - getFunctionByName
```
ExpressionFunctionType getFunctionByName(String name)
```
    Attempts to resolve a pertinent function by its calling name.
    Names must be resolved case-insensitively!
    If this returns a non-null for a function name, containsFunctionByName(String) must NOT return false if called with that name!
    The same function must be returned if this is called again with the same name!
    
    Parameters:
    
    name - the name to resolve.
    
    Returns:
    
    a corresponding function or null for no such function.
    
    See Also:
    
    containsFunctionByName(String)