Package org.springframework.binding.expression.spel

Class SpringELExpression

java.lang.Object

org.springframework.binding.expression.spel.SpringELExpression

All Implemented Interfaces:

Expression

public class SpringELExpression
extends Object
implements Expression

A wrapper for a Spring EL Expression allowing it to be used under the Spring Binding Expression abstraction.

Since:

2.1.0

Author:

Rossen Stoyanchev

Constructor Summary

Constructors

Constructor	Description
SpringELExpression(org.springframework.expression.Expression expression, Class<?> expectedType, EvaluationContextFactory contextFactory)	Generalized constructor variant that accepts an EvaluationContextFactory.
SpringELExpression(org.springframework.expression.Expression expression, Map<String,Expression> expressionVars, Class<?> expectedType, org.springframework.core.convert.ConversionService conversionService, List<org.springframework.expression.PropertyAccessor> propertyAccessors)	Constructor for SpringELExpression.

Method Summary

Modifier and Type	Method	Description
protected void	extendEvaluationContext(org.springframework.expression.spel.support.StandardEvaluationContext context)	Deprecated. as of 2.4.8, to customize the context, please use the constructor that accepts an EvaluationContextFactory.
String	getExpressionString()	Returns the original string used to create this expression, unmodified.
Object	getValue(Object rootObject)	Evaluate this expression in the provided context and return the result of evaluation.
Class<?>	getValueType(Object rootObject)	Returns the most general type that can be passed to the Expression.setValue(Object, Object) method for the given context.
void	setValue(Object rootObject, Object value)	Set this expression in the provided context to the value provided.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Details

SpringELExpression

public SpringELExpression(org.springframework.expression.Expression expression,
 Map<String,Expression> expressionVars,
 Class<?> expectedType,
 org.springframework.core.convert.ConversionService conversionService,
 List<org.springframework.expression.PropertyAccessor> propertyAccessors)

Constructor for SpringELExpression.

Parameters:

expression - a parsed Spring EL expression instance. Must not be null.

expressionVars - provides a mapping between variables names and parsed Spring EL expression instances. This parameter is optional (may be null).

expectedType - the target type expected from the evaluation of the expression or null. This parameter is optional (may be null).

conversionService - the Spring ConversionService instance to use for type conversion

propertyAccessors - propertyAccessors for Spring EL to use when evaluating expressions

SpringELExpression

public SpringELExpression(org.springframework.expression.Expression expression,
 Class<?> expectedType,
 EvaluationContextFactory contextFactory)

Generalized constructor variant that accepts an EvaluationContextFactory.

Since:

2.4.8

Method Details

getExpressionString

public String getExpressionString()

Description copied from interface: Expression

Returns the original string used to create this expression, unmodified.

Specified by:

getExpressionString in interface Expression

Returns:

the original expression string

getValue

public Object getValue(Object rootObject)
                throws EvaluationException

Description copied from interface: Expression

Evaluate this expression in the provided context and return the result of evaluation.

Specified by:

getValue in interface Expression

Parameters:

rootObject - the context to evaluate this expression in

Returns:

the evaluation result

Throws:

EvaluationException - an exception occurred during expression evaluation

getValueType

public Class<?> getValueType(Object rootObject)
                      throws EvaluationException

Description copied from interface: Expression

Returns the most general type that can be passed to the Expression.setValue(Object, Object) method for the given context.

Specified by:

getValueType in interface Expression

Parameters:

rootObject - the context to evaluate

Returns:

the most general type of value that can be set on this context, or null if the type information cannot be determined

Throws:

EvaluationException - an exception occurred during expression evaluation

setValue

public void setValue(Object rootObject,
 Object value)
              throws EvaluationException

Description copied from interface: Expression

Set this expression in the provided context to the value provided.

Specified by:

setValue in interface Expression

Parameters:

rootObject - the context on which the new value should be set

value - the new value to set

Throws:

EvaluationException - an exception occurred during expression evaluation

extendEvaluationContext

@Deprecated
protected void extendEvaluationContext(org.springframework.expression.spel.support.StandardEvaluationContext context)

Deprecated.

as of 2.4.8, to customize the context, please use the constructor that accepts an EvaluationContextFactory.

Invoked every time an evaluation context is created allowing further initialization from sub-classes.

toString

public String toString()

Overrides:

toString in class Object