org.springframework.context.expression

Class CachedExpressionEvaluator

java.lang.Object

org.springframework.context.expression.CachedExpressionEvaluator

Direct Known Subclasses:

EventExpressionEvaluator, ExpressionEvaluator

public abstract class CachedExpressionEvaluator
extends java.lang.Object

Shared utility class used to evaluate and cache SpEL expressions that are defined on AnnotatedElement.

Since:

4.2.0

Author:

Stephane Nicoll

See Also:

AnnotatedElementKey

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected static class	CachedExpressionEvaluator.ExpressionKey

Field Summary

Fields

Modifier and Type	Field and Description
private SpelExpressionParser	parser

Constructor Summary

Constructors

Modifier	Constructor and 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

Modifier and Type	Method and Description
private CachedExpressionEvaluator.ExpressionKey	createKey(AnnotatedElementKey elementKey, java.lang.String expression)
protected Expression	getExpression(java.util.Map<CachedExpressionEvaluator.ExpressionKey,Expression> cache, AnnotatedElementKey elementKey, java.lang.String expression) Return the Expression for the specified SpEL value
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

Field Detail

parser

private final SpelExpressionParser parser

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.

getExpression

protected Expression getExpression(java.util.Map<CachedExpressionEvaluator.ExpressionKey,Expression> cache,
                                   AnnotatedElementKey elementKey,
                                   java.lang.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

createKey

private CachedExpressionEvaluator.ExpressionKey createKey(AnnotatedElementKey elementKey,
                                                          java.lang.String expression)