SpelExpression

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org.springframework.expression.spel.standard
Class SpelExpression

java.lang.Object
  org.springframework.expression.spel.standard.SpelExpression

All Implemented Interfaces:: Expression

public class SpelExpression
extends Object
implements Expression
extends Object
implements Expression

A SpelExpressions represents a parsed (valid) expression that is ready to be evaluated in a specified context. An expression can be evaluated standalone or in a specified context. During expression evaluation the context may be asked to resolve references to types, beans, properties, methods.

Since:: 3.0
Author:: Andy Clement

Constructor Summary
`SpelExpression(String expression, SpelNodeImpl ast, SpelParserConfiguration configuration)` Construct an expression, only used by the parser.

Method Summary

SpelNode getAST()

EvaluationContext getEvaluationContext()
Return the default evaluation context that will be used if none is supplied on an evaluation call

String getExpressionString()
Returns the original string used to create this expression, unmodified.

Object getValue()
Evaluate this expression in the default standard context.





<T> T

getValue(Class<T> expectedResultType)
Evaluate the expression in the default context.

Object getValue(EvaluationContext context)
Evaluate this expression in the provided context and return the result of evaluation.





<T> T

getValue(EvaluationContext context,
         Class<T> expectedResultType)

Evaluate the expression in a specified context which can resolve references to properties, methods, types, etc - the type of the evaluation result is expected to be of a particular class and an exception will be thrown if it is not and cannot be converted to that type.

Object getValue(EvaluationContext context, Object rootObject)
Evaluate this expression in the provided context and return the result of evaluation, but use the supplied root context as an override for any default root object specified in the context.





<T> T

getValue(EvaluationContext context,
         Object rootObject,
         Class<T> expectedResultType)

Object getValue(Object rootObject)
Evaluate this expression against the specified root object





<T> T

getValue(Object rootObject,
         Class<T> expectedResultType)

Evaluate the expression in the default context against the specified root object.

Class getValueType()
Returns the most general type that can be passed to the Expression.setValue(EvaluationContext, Object) method using the default context.

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

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

Class getValueType(Object rootObject)
Returns the most general type that can be passed to the Expression.setValue(EvaluationContext, Object) method using the default context.

TypeDescriptor getValueTypeDescriptor()
Returns the most general type that can be passed to the Expression.setValue(EvaluationContext, Object) method using the default context.

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

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

TypeDescriptor getValueTypeDescriptor(Object rootObject)
Returns the most general type that can be passed to the Expression.setValue(EvaluationContext, Object) method using the default context.

boolean isWritable(EvaluationContext context)
Determine if an expression can be written to, i.e.

boolean isWritable(EvaluationContext context, Object rootObject)
Determine if an expression can be written to, i.e.

boolean isWritable(Object rootObject)
Determine if an expression can be written to, i.e.

void setEvaluationContext(EvaluationContext context)
Set the evaluation context that will be used if none is specified on an evaluation call.

void setValue(EvaluationContext context, Object value)
Set this expression in the provided context to the value provided.

void setValue(EvaluationContext context, Object rootObject, Object value)
Set this expression in the provided context to the value provided.

void setValue(Object rootObject, Object value)
Set this expression in the provided context to the value provided.

String toStringAST()
Produce a string representation of the Abstract Syntax Tree for the expression, this should ideally look like the input expression, but properly formatted since any unnecessary whitespace will have been discarded during the parse of the expression.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

SpelExpression

public SpelExpression(String expression,
                      SpelNodeImpl ast,
                      SpelParserConfiguration configuration)

Construct an expression, only used by the parser.

Method Detail