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java.lang.Objectedu.udo.cs.yale.operator.Operator
edu.udo.cs.yale.operator.io.ExcelExampleSource
public class ExcelExampleSource
This operator can be used to load data from Microsoft Excel spreadsheets. This operator is able to reads data from Excel 95, 97, 2000, XP, and 2003. The user has to define which of the spreadsheets in the workbook should be used as data table. The table must have a format so that each line is an example and each column represents an attribute. Please note that the first line might be used for attribute names which can be indicated by a parameter.
The data table can be placed anywhere on the sheet and is allowed to contain arbitrary formatting instructions, empty rows, and empty columns. Missing data values are indicated by empty cells or by cells containing only "?".
Constructor Summary | |
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ExcelExampleSource(OperatorDescription description)
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Method Summary | |
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IOObject[] |
apply()
Implement this method in subclasses. |
java.lang.Class[] |
getInputClasses()
Returns the classes that are needed as input. |
java.lang.Class[] |
getOutputClasses()
Returns the classes that are guaranteed to be returned by apply() as additional output. |
java.util.List<ParameterType> |
getParameterTypes()
Returns a list of ParameterTypes describing the parameters of this operator. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public ExcelExampleSource(OperatorDescription description)
Method Detail |
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public IOObject[] apply() throws OperatorException
Operator
apply
in class Operator
OperatorException
public java.lang.Class[] getInputClasses()
Operator
Operator.getOutputClasses()
and
Operator.apply()
if this is necessary. This default behavior can be
changed by overriding Operator.getInputDescription(Class)
. Subclasses
which implement this method should not make use of parameters since this
method is invoked by getParameterTypes(). Therefore, parameters are not
fully available at this point of time and this might lead to exceptions.
Please use InputDescriptions instead.
getInputClasses
in class Operator
public java.lang.Class[] getOutputClasses()
Operator
Operator.getInputDescription(Class)
and can be changed by
overwriting this method. Objects which are not consumed must not be
defined as additional output in this method. May be null or an empy array
(no additional output is produced).
getOutputClasses
in class Operator
public java.util.List<ParameterType> getParameterTypes()
Operator
getParameterTypes
in class Operator
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