MapGetFunction (Geotools modules 31-SNAPSHOT API)

Object
- ExpressionAbstract
- - DefaultExpression
  - - FunctionExpressionImpl
    - - MapGetFunction

All Implemented Interfaces:

Expression, Function, VolatileFunction, FunctionExpression, Factory
```
public class MapGetFunction
extends FunctionExpressionImpl
implements VolatileFunction
```
Extracts a value from a map given the map name and the needed key as parameters

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

MapGetFunction()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Object`	`evaluate(Object feature)`	Subclass should override, default implementation returns null.
`<T> T`	`evaluate(Object object, Class<T> context)`	Default implementation delegates handling of context conversion to Converters utility class.

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 Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface Expression
accept

Methods inherited from interface Function
getFallbackValue, getFunctionName, getName, getParameters

- Field Detail
  - NAME
```
public static FunctionName NAME
```
- Constructor Detail
  - MapGetFunction
```
public MapGetFunction()
```
- Method Detail
  - evaluate
```
public <T> T evaluate(Object object,
                      Class<T> context)
```
    Description copied from class: ExpressionAbstract
    
    Default implementation delegates handling of context conversion to Converters utility class.
    Subclasses are expected to make use of the Converters utility class (as the easiest way to provide value morphing in conformance with the Filter specification).
    
    Specified by:
    
    evaluate in interface Expression
    
    Overrides:
    
    evaluate in class ExpressionAbstract
    
    Type Parameters:
    
    T - The type of the returned object.
    
    Parameters:
    
    object - The object to evaluate the expression against.
    
    context - The type of the resulting value of the expression.
    
    Returns:
    
    Evaluates the given expression based on the content of the given object an an instance of context.
  - 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