DefaultFunctionCollection (pip-services3-expressions 3.0.0 API)

java.lang.Object
- org.pipservices3.expressions.calculator.functions.FunctionCollection
- - org.pipservices3.expressions.calculator.functions.DefaultFunctionCollection

All Implemented Interfaces:

IFunctionCollection
```
public class DefaultFunctionCollection
extends FunctionCollection
```
Implements a list filled with standard functions.

Constructor Summary

Constructors
Constructor Description

DefaultFunctionCollection()
Constructs this list and fills it with the standard functions.

Method Summary

Modifier and Type	Method	Description
`protected void`	`checkParamCount(List<Variant> params, int expectedParamCount)`	Checks if params contains the correct number of function parameters (must be stored on the top of the params).
`protected Variant`	`getParameter(List<Variant> params, int paramIndex)`	Gets function parameter by it's index.

Methods inherited from class org.pipservices3.expressions.calculator.functions.FunctionCollection
add, clear, findByName, findIndexByName, get, getAll, length, remove, removeByName

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - DefaultFunctionCollection
```
public DefaultFunctionCollection()
```
    Constructs this list and fills it with the standard functions.
- Method Detail
  - checkParamCount
```
protected void checkParamCount(List<Variant> params,
                               int expectedParamCount)
                        throws ExpressionException
```
    Checks if params contains the correct number of function parameters (must be stored on the top of the params).
    
    Parameters:
    
    params - A list of function parameters.
    
    expectedParamCount - The expected number of function parameters.
    
    Throws:
    
    ExpressionException
  - getParameter
```
protected Variant getParameter(List<Variant> params,
                               int paramIndex)
```
    Gets function parameter by it's index.
    
    Parameters:
    
    params - A list of function parameters.
    
    paramIndex - Index for the function parameter (0 for the first parameter).
    
    Returns:
    
    Function parameter value.