Class CachedExpressionEvaluator

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 an 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	An expression key.

Constructor Summary

Constructors

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

Method Summary

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

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

CachedExpressionEvaluator

protected CachedExpressionEvaluator()

Create a new instance with the default SpelExpressionParser.

CachedExpressionEvaluator

protected CachedExpressionEvaluator(SpelExpressionParser parser)

Create a new instance with the specified SpelExpressionParser.

Method Details

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 parsed Expression for the specified SpEL expression.

Parses the expression if it hasn't already been parsed and cached.

Parameters:

cache - the cache to use

elementKey - the AnnotatedElementKey containing the element on which the expression is defined

expression - the expression to parse

parseExpression

protected Expression parseExpression(String expression)

Parse the specified expression.

Parameters:

expression - the expression to parse

Since:

5.3.13