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Class weka.experiment.DatabaseResultProducer

java.lang.Object
   |
   +----weka.experiment.DatabaseUtils
           |
           +----weka.experiment.DatabaseResultListener
                   |
                   +----weka.experiment.DatabaseResultProducer

public class DatabaseResultProducer

extends DatabaseResultListener

implements ResultProducer, OptionHandler

Version:

$Revision: 1.3 $

Author:

Len Trigg (trigg@cs.waikato.ac.nz)

DatabaseResultProducer()

Creates the DatabaseResultProducer, letting the parent constructor do it's thing.

acceptResult(ResultProducer, Object[], Object[])

Accepts results from a ResultProducer.

doRun(int)

Gets the results for a specified run number.

getCompatibilityState()

Gets a description of the internal settings of the result producer, sufficient for distinguishing a ResultProducer instance from another with different settings (ignoring those settings set through this interface).

getKeyNames()

Gets the names of each of the columns produced for a single run.

getKeyTypes()

Gets the data types of each of the columns produced for a single run.

getOptions()

Gets the current settings of the result producer.

getResultNames()

Gets the names of each of the columns produced for a single run.

getResultProducer()

Get the ResultProducer.

getResultTypes()

Gets the data types of each of the columns produced for a single run.

isResultRequired(ResultProducer, Object[])

Determines whether the results for a specified key must be generated.

listOptions()

Returns an enumeration describing the available options.

postProcess()

When this method is called, it indicates that no more requests to generate results for the current experiment will be sent.

postProcess(ResultProducer)

When this method is called, it indicates that no more results will be sent that need to be grouped together in any way.

preProcess()

Prepare to generate results.

preProcess(ResultProducer)

Prepare for the results to be received.

setInstances(Instances)

Sets the dataset that results will be obtained for.

setOptions(String[])

Parses a given list of options.

setResultListener(ResultListener)

Sets the object to send results of each run to.

setResultProducer(ResultProducer)

Set the ResultProducer.

toString()

Gets a text descrption of the result producer.

 public DatabaseResultProducer() throws Exception

Creates the DatabaseResultProducer, letting the parent constructor do it's thing.

Throws: Exception

if an error occurs

 public void doRun(int run) throws Exception

Gets the results for a specified run number. Different run numbers correspond to different randomizations of the data. Results produced should be sent to the current ResultListener

Parameters:

run - the run number to get results for.

Throws: Exception

if a problem occurs while getting the results

 public void preProcess(ResultProducer rp) throws Exception

Prepare for the results to be received.

Parameters:

rp - the ResultProducer that will generate the results

Throws: Exception

if an error occurs during preprocessing.

Overrides:

preProcess in class DatabaseResultListener

 public void postProcess(ResultProducer rp) throws Exception

When this method is called, it indicates that no more results will be sent that need to be grouped together in any way.

Parameters:

rp - the ResultProducer that generated the results

Throws: Exception

if an error occurs

Overrides:

postProcess in class DatabaseResultListener

 public void preProcess() throws Exception

Prepare to generate results. The ResultProducer should call preProcess(this) on the ResultListener it is to send results to.

Throws: Exception

if an error occurs during preprocessing.

 public void postProcess() throws Exception

When this method is called, it indicates that no more requests to generate results for the current experiment will be sent. The ResultProducer should call preProcess(this) on the ResultListener it is to send results to.

Throws: Exception

if an error occurs

 public void acceptResult(ResultProducer rp,
                          Object key[],
                          Object result[]) throws Exception

Accepts results from a ResultProducer.

Parameters:

rp - the ResultProducer that generated the results

key - an array of Objects (Strings or Doubles) that uniquely identify a result for a given ResultProducer with given compatibilityState

result - the results stored in an array. The objects stored in the array may be Strings, Doubles, or null (for the missing value).

Throws: Exception

if the result could not be accepted.

Overrides:

acceptResult in class DatabaseResultListener

 public boolean isResultRequired(ResultProducer rp,
                                 Object key[]) throws Exception

Determines whether the results for a specified key must be generated.

Parameters:

rp - the ResultProducer wanting to generate the results

key - an array of Objects (Strings or Doubles) that uniquely identify a result for a given ResultProducer with given compatibilityState

Returns:

true if the result should be generated

Throws: Exception

if it could not be determined if the result is needed.

Overrides:

isResultRequired in class DatabaseResultListener

 public String[] getKeyNames() throws Exception

Gets the names of each of the columns produced for a single run.

Returns:

an array containing the name of each column

 public Object[] getKeyTypes() throws Exception

Gets the data types of each of the columns produced for a single run. This method should really be static.

Returns:

an array containing objects of the type of each column. The objects should be Strings, or Doubles.

 public String[] getResultNames() throws Exception

Gets the names of each of the columns produced for a single run. A new result field is added for the number of results used to produce each average. If only averages are being produced the names are not altered, if standard deviations are produced then "Dev_" and "Avg_" are prepended to each result deviation and average field respectively.

Returns:

an array containing the name of each column

 public Object[] getResultTypes() throws Exception

Gets the data types of each of the columns produced for a single run.

Returns:

an array containing objects of the type of each column. The objects should be Strings, or Doubles.

 public String getCompatibilityState()

Gets a description of the internal settings of the result producer, sufficient for distinguishing a ResultProducer instance from another with different settings (ignoring those settings set through this interface). For example, a cross-validation ResultProducer may have a setting for the number of folds. For a given state, the results produced should be compatible. Typically if a ResultProducer is an OptionHandler, this string will represent the command line arguments required to set the ResultProducer to that state.

Returns:

the description of the ResultProducer state, or null if no state is defined

 public Enumeration listOptions()

Returns an enumeration describing the available options.

Returns:

an enumeration of all the available options

 public void setOptions(String options[]) throws Exception

Parses a given list of options. Valid options are:

-W classname
Specify the full class name of the result producer.

All option after -- will be passed to the result producer.

Parameters:

options - the list of options as an array of strings

Throws: Exception

if an option is not supported

 public String[] getOptions()

Gets the current settings of the result producer.

Returns:

an array of strings suitable for passing to setOptions

 public void setInstances(Instances instances)

Sets the dataset that results will be obtained for.

Parameters:

instances - a value of type 'Instances'.

 public void setResultListener(ResultListener listener)

Sets the object to send results of each run to.

Parameters:

listener - a value of type 'ResultListener'

 public ResultProducer getResultProducer()

Get the ResultProducer.

Returns:

the ResultProducer.

 public void setResultProducer(ResultProducer newResultProducer)

Set the ResultProducer.

Parameters:

newResultProducer - new ResultProducer to use.

 public String toString()

Gets a text descrption of the result producer.

Returns:

a text description of the result producer.

Overrides:

toString in class Object

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