Package org.springframework.data.repository.query

Class ValueExpressionDelegate

java.lang.Object

org.springframework.data.repository.query.ValueExpressionDelegate

All Implemented Interfaces:

ValueExpressionParser

Direct Known Subclasses:

CachingValueExpressionDelegate

public class ValueExpressionDelegate
extends Object
implements ValueExpressionParser

Delegate to provide a ValueExpressionParser along with a context factory.

Subclasses can customize parsing behavior.

Author:

Mark Paluch

Constructor Summary

Constructors

Constructor	Description
ValueExpressionDelegate(QueryMethodValueEvaluationContextAccessor contextAccessor, ValueExpressionParser valueExpressionParser)	Creates a new ValueExpressionDelegate given QueryMethodValueEvaluationContextAccessor and ValueExpressionParser.

Method Summary

Modifier and Type	Method	Description
static ValueExpressionDelegate	create()	Creates a default ValueExpressionDelegate using the StandardEnvironment, a default ValueExpression and extension-less EvaluationContextProvider.
ValueEvaluationContextProvider	createValueContextProvider(Parameters<?,?> parameters)	Creates a ValueEvaluationContextProvider for query method Parameters for later creation of a ValueEvaluationContext based on the actual method parameter values.
QueryMethodValueEvaluationContextAccessor	getEvaluationContextAccessor()
ValueExpressionParser	getValueExpressionParser()
ValueExpression	parse(String expressionString)	Parses the expression string and return an Expression object you can use for repeated evaluation.

Methods inherited from class java.lang.Object

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

Constructor Details

ValueExpressionDelegate

public ValueExpressionDelegate(QueryMethodValueEvaluationContextAccessor contextAccessor,
 ValueExpressionParser valueExpressionParser)

Creates a new ValueExpressionDelegate given QueryMethodValueEvaluationContextAccessor and ValueExpressionParser.

Parameters:

contextAccessor - the factory to create value evaluation context providers, must not be null.

valueExpressionParser - the parser to parse expression strings into value expressions, must not be null.

Method Details

create

public static ValueExpressionDelegate create()

Creates a default ValueExpressionDelegate using the StandardEnvironment, a default ValueExpression and extension-less EvaluationContextProvider.

Returns:

a default ValueExpressionDelegate.

getValueExpressionParser

public ValueExpressionParser getValueExpressionParser()

getEvaluationContextAccessor

public QueryMethodValueEvaluationContextAccessor getEvaluationContextAccessor()

createValueContextProvider

public ValueEvaluationContextProvider createValueContextProvider(Parameters<?,?> parameters)

Creates a ValueEvaluationContextProvider for query method Parameters for later creation of a ValueEvaluationContext based on the actual method parameter values. The resulting ValueEvaluationContextProvider is only valid for the given parameters

Parameters:

parameters - the query method parameters to use.

Returns:

parse

public ValueExpression parse(String expressionString)
                      throws ParseException

Description copied from interface: ValueExpressionParser

Parses the expression string and return an Expression object you can use for repeated evaluation.

Some examples:

     #{3 + 4}
     #{name.firstName}
     ${key.one}
     #{name.lastName}-${key.one}
 

Specified by:

parse in interface ValueExpressionParser

Parameters:

expressionString - the raw expression string to parse.

Returns:

an evaluator for the parsed expression.

Throws:

ParseException - an exception occurred during parsing.