org.springframework.data.mapping.model

Class SpELExpressionParameterValueProvider<P extends PersistentProperty<P>>

java.lang.Object

org.springframework.data.mapping.model.SpELExpressionParameterValueProvider<P>

All Implemented Interfaces:

ParameterValueProvider<P>

public class SpELExpressionParameterValueProvider<P extends PersistentProperty<P>>
extends Object
implements ParameterValueProvider<P>

ParameterValueProvider that can be used to front a ParameterValueProvider delegate to prefer a SpEL expression evaluation over directly resolving the parameter value with the delegate.

Author:

Oliver Gierke, Mark Paluch

Constructor Summary

Constructors

Constructor and Description
SpELExpressionParameterValueProvider(@NonNull SpELExpressionEvaluator evaluator, @NonNull ConversionService conversionService, @NonNull ParameterValueProvider<P> delegate)

Method Summary

Modifier and Type	Method and Description
<T> T	getParameterValue(PreferredConstructor.Parameter<T,P> parameter) Returns the value to be used for the given PreferredConstructor.Parameter (usually when entity instances are created).
protected <T> T	potentiallyConvertSpelValue(Object object, PreferredConstructor.Parameter<T,P> parameter) Hook to allow to massage the value resulting from the Spel expression evaluation.

Methods inherited from class java.lang.Object

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

Constructor Detail

SpELExpressionParameterValueProvider

public SpELExpressionParameterValueProvider(@NonNull
                                            @NonNull SpELExpressionEvaluator evaluator,
                                            @NonNull
                                            @NonNull ConversionService conversionService,
                                            @NonNull
                                            @NonNull ParameterValueProvider<P> delegate)

Method Detail

getParameterValue

@Nullable
public <T> T getParameterValue(PreferredConstructor.Parameter<T,P> parameter)

Description copied from interface: ParameterValueProvider

Returns the value to be used for the given PreferredConstructor.Parameter (usually when entity instances are created).

Specified by:

getParameterValue in interface ParameterValueProvider<P extends PersistentProperty<P>>

Parameters:

parameter - must not be null.

Returns:

potentiallyConvertSpelValue

@Nullable
protected <T> T potentiallyConvertSpelValue(Object object,
                                                      PreferredConstructor.Parameter<T,P> parameter)

Hook to allow to massage the value resulting from the Spel expression evaluation. Default implementation will leverage the configured ConversionService to massage the value into the parameter type.

Parameters:

object - the value to massage, will never be null.

parameter - the PreferredConstructor.Parameter we create the value for

Returns: