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java.lang.Object org.springframework.binding.expression.beanwrapper.BeanWrapperExpression
public class BeanWrapperExpression
An expression that delegates to a bean wrapper
to evaluate or set a property of a context.
Also supports the configuration of a ConversionService
to allow StringToObject type conversion to occur as
part of setting a property. The StringToObject ConversionExecutors are automatically adapted and registered as
PropertyEditors.
Mainly exists to take advantage of BeanWrapper's unique property access features as an Expression implementation,
notably the ability to infer types of generic collections and maps and perform type coersion on collection elements
when setting values.
Note that Spring's BeanWrapper is not a full-blown EL implementation: it only supports property access, and does not
support method invocation, arithmetic operations, or logic operations.
Constructor Summary | |
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BeanWrapperExpression(java.lang.String expression,
ConversionService conversionService)
Creates a new bean wrapper expression. |
Method Summary | |
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boolean |
equals(java.lang.Object o)
|
java.lang.String |
getExpressionString()
Returns the original string used to create this expression, unmodified. |
java.lang.Object |
getValue(java.lang.Object context)
Evaluate this expression in the provided context and return the result of evaluation. |
java.lang.Class<?> |
getValueType(java.lang.Object context)
Returns the most general type that can be passed to the Expression.setValue(Object, Object) method for the given
context. |
int |
hashCode()
|
void |
setAutoGrowCollectionLimit(int autoGrowCollectionLimit)
Specify a limit for array and collection auto-growing. |
void |
setAutoGrowNestedPaths(boolean autoGrowNestedPaths)
Set whether this BeanWrapper should attempt to "auto-grow" a nested path that contains a null value. |
void |
setValue(java.lang.Object context,
java.lang.Object value)
Set this expression in the provided context to the value provided. |
java.lang.String |
toString()
|
Methods inherited from class java.lang.Object |
---|
clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public BeanWrapperExpression(java.lang.String expression, ConversionService conversionService)
expression
- the property expression stringconversionService
- the conversion service containing converters to use as PropertyEditors for type
conversionMethod Detail |
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public void setAutoGrowNestedPaths(boolean autoGrowNestedPaths)
If "true", a null path location will be populated with a default object value and traversed
instead of resulting in a NullValueInNestedPathException
. Turning this flag on also
enables auto-growth of collection elements when accessing an out-of-bounds index.
Default is "false" on a plain BeanWrapper.
public void setAutoGrowCollectionLimit(int autoGrowCollectionLimit)
Default is unlimited on a plain BeanWrapper.
public boolean equals(java.lang.Object o)
equals
in class java.lang.Object
public int hashCode()
hashCode
in class java.lang.Object
public java.lang.Object getValue(java.lang.Object context) throws EvaluationException
Expression
getValue
in interface Expression
context
- the context to evaluate this expression in
EvaluationException
- an exception occurred during expression evaluationpublic void setValue(java.lang.Object context, java.lang.Object value)
Expression
setValue
in interface Expression
context
- the context on which the new value should be setvalue
- the new value to setpublic java.lang.Class<?> getValueType(java.lang.Object context)
Expression
Expression.setValue(Object, Object)
method for the given
context.
getValueType
in interface Expression
context
- the context to evaluate
null
if the type
information cannot be determinedpublic java.lang.String getExpressionString()
Expression
getExpressionString
in interface Expression
public java.lang.String toString()
toString
in class java.lang.Object
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