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An executable operation.
Method Summary | |
java.lang.Object |
execute(Context context)
executes the operation in a given context. objects in the context might be used in evaluation, or operation could produce more objects into the context. |
boolean |
needsParameter(java.lang.String name)
So clients may query if this operation needs a particular parameter. a return value 'true' means that in order to execute this parameter, a parameter with the given name must exist in the context. |
boolean |
needsParameters()
So clients may query whether this operation needs any parameters at all. |
Method Detail |
public boolean needsParameters()
public boolean needsParameter(java.lang.String name)
So clients may query if this operation needs a particular parameter. a return value 'true' means that in order to execute this parameter, a parameter with the given name must exist in the context.
if the parmeter in question is an optional parameter, a true must be returned.
public java.lang.Object execute(Context context) throws OperationException
executes the operation in a given context. objects in the context might be used in evaluation, or operation could produce more objects into the context.
NOTE: operations must be re-executable.
OperationException
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