Collection_CountFunction (Geotools modules 30-SNAPSHOT API)

Object
- ExpressionAbstract
- - DefaultExpression
  - - FunctionExpressionImpl
    - - Collection_CountFunction

All Implemented Interfaces:

FunctionExpression, Factory, Expression, Function
```
public class Collection_CountFunction
extends FunctionExpressionImpl
```
Calculates the count value of an attribute for a given SimpleFeatureCollection and Expression.

Since:

2.2M2

Author:

Cory Horner

- Field Summary
  
  Fields
  Modifier and Type Field Description
  
  static FunctionName NAME
  - Fields inherited from class FunctionExpressionImpl
    fallback, functionName, name, params
  - Fields inherited from interface Expression
    NIL
- Constructor Summary
  
  Constructors
  Constructor Description
  
  Collection_CountFunction()
  Creates a new instance of Collection_CountFunction
- Method Summary
  
  All Methods Instance Methods Concrete Methods
  Modifier and Type Method Description
  
  Object evaluate(Object feature)
  Subclass should override, default implementation returns null.
  - Methods inherited from class FunctionExpressionImpl
    accept, equals, functionName, getExpression, getFallbackValue, getFunctionName, getImplementationHints, getName, getParameters, hashCode, setFallbackValue, setParameters, toString
  - Methods inherited from class DefaultExpression
    isAttributeExpression, isExpression, isFunctionExpression, isGeometryExpression, isLiteralExpression, isMathExpression
  - Methods inherited from class ExpressionAbstract
    evaluate
  - Methods inherited from class Object
    clone, finalize, getClass, notify, notifyAll, wait, wait, wait
  - Methods inherited from interface Expression
    evaluate

- Field Detail
  - NAME
```
public static FunctionName NAME
```
- Constructor Detail
  - Collection_CountFunction
```
public Collection_CountFunction()
```
    Creates a new instance of Collection_CountFunction
- Method Detail
  - evaluate
```
public Object evaluate(Object feature)
```
    Description copied from class: ExpressionAbstract
    
    Subclass should override, default implementation returns null.
    
    Specified by:
    
    evaluate in interface Expression
    
    Overrides:
    
    evaluate in class FunctionExpressionImpl
    
    Returns:
    
    default implementation returns null