ExpressionAbstract (Geotools modules 31-SNAPSHOT API)

Object
- ExpressionAbstract

All Implemented Interfaces:

Expression

Direct Known Subclasses:

DefaultExpression, FunctionImpl
```
public abstract class ExpressionAbstract
extends Object
implements Expression
```
Abstract superclass of these Expression implementations.

Author:

Jody Garnett

Field Summary
- Fields inherited from interface Expression
  NIL

Constructor Summary

Constructors
Constructor Description

ExpressionAbstract()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Object`	`evaluate(Object object)`	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 Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface Expression
accept

- Constructor Detail
  - ExpressionAbstract
```
public ExpressionAbstract()
```
- Method Detail
  - evaluate
```
public Object evaluate(Object object)
```
    Subclass should override, default implementation returns null.
    
    Specified by:
    
    evaluate in interface Expression
    
    Returns:
    
    default implementation returns null
  - evaluate
```
public <T> T evaluate(Object object,
                      Class<T> context)
```
    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
    
    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.