CachedExpressionEvaluator (Spring Framework 4.3.30.RELEASE API)

java.lang.Object
- org.springframework.context.expression.CachedExpressionEvaluator

```
public abstract class CachedExpressionEvaluator
extends Object
```
Shared utility class used to evaluate and cache SpEL expressions that are defined on AnnotatedElement.
Since:
4.2
Author:
Stephane Nicoll
See Also:
AnnotatedElementKey

Nested Class Summary
Nested Classes
Modifier and Type Class Description
protected static class CachedExpressionEvaluator.ExpressionKey

Constructor Summary

Constructors
Modifier	Constructor	Description
`protected`	`CachedExpressionEvaluator()`	Create a new instance with a default `SpelExpressionParser`.
`protected`	`CachedExpressionEvaluator(SpelExpressionParser parser)`	Create a new instance with the specified `SpelExpressionParser`.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected Expression`	`getExpression(Map<CachedExpressionEvaluator.ExpressionKey,Expression> cache, AnnotatedElementKey elementKey, String expression)`	Return the `Expression` for the specified SpEL value
`protected ParameterNameDiscoverer`	`getParameterNameDiscoverer()`	Return a shared parameter name discoverer which caches data internally.
`protected SpelExpressionParser`	`getParser()`	Return the `SpelExpressionParser` to use.

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

- Constructor Detail
  - CachedExpressionEvaluator
```
protected CachedExpressionEvaluator(SpelExpressionParser parser)
```
    Create a new instance with the specified SpelExpressionParser.
  - CachedExpressionEvaluator
```
protected CachedExpressionEvaluator()
```
    Create a new instance with a default SpelExpressionParser.
- Method Detail
  - getParser
```
protected SpelExpressionParser getParser()
```
    Return the SpelExpressionParser to use.
  - getParameterNameDiscoverer
```
protected ParameterNameDiscoverer getParameterNameDiscoverer()
```
    Return a shared parameter name discoverer which caches data internally.
    Since:
    4.3
  - getExpression
```
protected Expression getExpression(Map<CachedExpressionEvaluator.ExpressionKey,Expression> cache,
                                   AnnotatedElementKey elementKey,
                                   String expression)
```
    Return the Expression for the specified SpEL value
    Parse the expression if it hasn't been already.
    Parameters:
    cache - the cache to use
    elementKey - the element on which the expression is defined
    expression - the expression to parse