DateDifferenceFunction (Geotools modules 31-SNAPSHOT API)

Object
- ExpressionAbstract
- - DefaultExpression
  - - FunctionExpressionImpl
    - - DateDifferenceFunction

All Implemented Interfaces:

Expression, Function, FunctionExpression, Factory
```
public class DateDifferenceFunction
extends FunctionExpressionImpl
```
The function computes the difference between two date objects (as a-b), in the specified time unit (default to milliseconds). Supported time units are "s", "m", "h", "d" (for seconds, minutes, hours, days respectively).

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

DateDifferenceFunction()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Object`	`evaluate(Object feature)`	Subclass should override, default implementation returns null.
`int`	`getArgCount()`
`String`	`getName()`	Gets the name of this function.

Methods inherited from class FunctionExpressionImpl
accept, equals, functionName, getExpression, getFallbackValue, getFunctionName, getImplementationHints, 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
  - DateDifferenceFunction
```
public DateDifferenceFunction()
```
- Method Detail
  - getName
```
public String getName()
```
    Description copied from class: FunctionExpressionImpl
    
    Gets the name of this function.
    
    Specified by:
    
    getName in interface Function
    
    Overrides:
    
    getName in class FunctionExpressionImpl
    
    Returns:
    
    the name of the function.
  - getArgCount
```
public int getArgCount()
```
  - 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