public class MethodExpression extends Object implements Expression
MethodExpression
evaluates a method on the current bean context.
Modifier and Type | Field and Description |
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private Method |
method
The method to call on the bean
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protected static Object[] |
NULL_ARGUMENTS
null arguments
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protected static Class[] |
NULL_CLASSES
null classes
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Constructor and Description |
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MethodExpression()
Base constructor
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MethodExpression(Method method)
Convenience constructor sets method property
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Modifier and Type | Method and Description |
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Object |
evaluate(Context context)
Evaluate by calling the read method on the current bean
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protected Method |
findAlternateMethod(Class type,
Method method)
Tries to find an alternate method for the given type using interfaces
which gets around the problem of inner classes,
such as on Map.Entry implementations.
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protected Object[] |
getArguments()
Allows derived objects to create arguments for the method call
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Method |
getMethod()
Gets the method used to evaluate this expression.
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protected void |
handleException(Context context,
Exception e)
Log error to context's logger.
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void |
setMethod(Method method)
Sets the method used to evaluate this expression
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String |
toString()
Returns something useful for logging.
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void |
update(Context context,
String newValue)
Do nothing.
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protected static Object[] NULL_ARGUMENTS
protected static Class[] NULL_CLASSES
private Method method
public MethodExpression()
public MethodExpression(Method method)
method
- the Method whose return value when invoked on the bean
will the value of this expressionpublic Object evaluate(Context context)
evaluate
in interface Expression
context
- the context against which this expression will be evaluatedpublic void update(Context context, String newValue)
update
in interface Expression
context
- update this Context
newValue
- the new value for this expressionExpression
public Method getMethod()
public void setMethod(Method method)
method
- method whose value (when invoked against the context's bean) will be used
to evaluate this expressionprotected Object[] getArguments()
NULL_ARGUMENTS
protected Method findAlternateMethod(Class type, Method method)
type
- the Class whose methods are to be searchedmethod
- the Method for which an alternative is to be search forprotected void handleException(Context context, Exception e)
Log error to context's logger.
Allows derived objects to handle exceptions differently.
context
- the Context being evaluated when the exception occurede
- the exception to handle