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Class weka.experiment.DatabaseResultListener

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

public class DatabaseResultListener

extends DatabaseUtils

implements ResultListener

Author:

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

DatabaseResultListener()

Sets up the database drivers

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

Submit the result to the appropriate table of the database

cacheKeyNameTipText()

Returns the tip text for this property

determineColumnConstraints(ResultProducer)

Determines if there are any constraints (imposed by the destination) on any additional measures produced by resultProducers.

getCacheKeyName()

Get the value of CacheKeyName.

globalInfo()

Returns a string describing this result listener

isResultRequired(ResultProducer, Object[])

Always says a result is required.

postProcess(ResultProducer)

Perform any postprocessing.

preProcess(ResultProducer)

Prepare for the results to be received.

setCacheKeyName(String)

Set the value of CacheKeyName.

 public DatabaseResultListener() throws Exception

Sets up the database drivers

Throws: Exception

if an error occurs

 public String globalInfo()

Returns a string describing this result listener

Returns:

a description of the result listener suitable for displaying in the explorer/experimenter gui

 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.

 public void postProcess(ResultProducer rp) throws Exception

Perform any postprocessing. 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

 public String[] determineColumnConstraints(ResultProducer rp) throws Exception

Determines if there are any constraints (imposed by the destination) on any additional measures produced by resultProducers. Null should be returned if there are NO constraints, otherwise a list of column names should be returned as an array of Strings. In the case of DatabaseResultListener, the structure of an existing database will impose constraints.

Parameters:

rp - the ResultProducer to which the constraints will apply

Returns:

an array of column names to which resutltProducer's results will be restricted.

Throws: Exception

if an error occurs.

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

Submit the result to the appropriate table of the database

Parameters:

rp - the ResultProducer that generated the result

key - The key for the results.

result - The actual results.

Throws: Exception

if the result couldn't be sent to the database

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

Always says a result is required. If this is the first call, prints out the header for the Database output.

Parameters:

rp - the ResultProducer wanting to generate the result

key - The key for which a result may be needed.

Returns:

true if the result should be calculated.

Throws: Exception

if the database couldn't be queried

 public String cacheKeyNameTipText()

Returns the tip text for this property

Returns:

tip text for this property suitable for displaying in the explorer/experimenter gui

 public String getCacheKeyName()

Get the value of CacheKeyName.

Returns:

Value of CacheKeyName.

 public void setCacheKeyName(String newCacheKeyName)

Set the value of CacheKeyName.

Parameters:

newCacheKeyName - Value to assign to CacheKeyName.

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