| java.lang.Object | |
| ↳ | org.apache.commons.betwixt.expression.MethodExpression |
Class Overview
MethodExpression evaluates a method on the current bean context.
Summary
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| NULL_ARGUMENTS | null arguments | ||||||||||
| NULL_CLASSES | null classes | ||||||||||
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Base constructor
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Convenience constructor sets method property
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| Public Methods | |||||||||||
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Evaluate by calling the read method on the current bean
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Gets the method used to evaluate this expression.
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Sets the method used to evaluate this expression
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Returns something useful for logging.
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Do nothing.
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| Protected Methods | |||||||||||
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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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Allows derived objects to create arguments for the method call
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Log error to context's logger. | |||||||||||
Log error to context's logger. | |||||||||||
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Inherited Methods | |||||||||||
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From class
java.lang.Object
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From interface
org.apache.commons.betwixt.expression.Expression
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Fields
Public Constructors
public MethodExpression ()
Base constructor
public MethodExpression (Method method)
Convenience constructor sets method property
Parameters
| method | the Method whose return value when invoked on the bean will the value of this expression |
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Public Methods
public Object evaluate (Context context)
Evaluate by calling the read method on the current bean
Parameters
| context | the context against which this expression will be evaluated |
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Returns
- the value returned by the method when it's invoked on the context's bean, so long as the method can be invoked. Otherwise, null.
public Method getMethod ()
Gets the method used to evaluate this expression.
Returns
- the method whose value (when invoked against the context's bean) will be used to evaluate this expression.
public void setMethod (Method method)
Sets the method used to evaluate this expression
Parameters
| method | method whose value (when invoked against the context's bean) will be used to evaluate this expression |
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public String toString ()
Returns something useful for logging.
Returns
- something useful for logging
public void update (Context context, String newValue)
Do nothing.
Parameters
| context | update this Context |
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| newValue | the new value for this expression |
See Also
Protected Methods
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.
Parameters
| type | the Class whose methods are to be searched |
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| method | the Method for which an alternative is to be search for |
Returns
- the alternative Method, if one can be found. Otherwise null.
protected Object[] getArguments ()
Allows derived objects to create arguments for the method call
Returns
protected void handleException (Context context, Exception e)
Log error to context's logger.
Allows derived objects to handle exceptions differently.
Parameters
| context | the Context being evaluated when the exception occured |
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| e | the exception to handle |
protected void handleException (Context context, Exception e, Method m)
Log error to context's logger.
Allows derived objects to handle exceptions differently.
Parameters
| context | the Context being evaluated when the exception occured |
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| e | the exception to handle |