/**
* Signify that this batch of input to the filter is finished. If the filter requires all
* instances prior to filtering, output() may now be called to retrieve the filtered instances.
*
* @return true if there are instances pending output
* @exception Exception if an error occurs
* @exception IllegalStateException if no input structure has been defined
*/
public boolean batchFinished() throws Exception {
if (getInputFormat() == null) {
throw new IllegalStateException("No input instance format defined");
}
if (m_Means == null) {
Instances input = getInputFormat();
m_Means = new double[input.numAttributes()];
m_StdDevs = new double[input.numAttributes()];
for (int i = 0; i < input.numAttributes(); i++) {
if (input.attribute(i).isNumeric() && (input.classIndex() != i)) {
m_Means[i] = input.meanOrMode(i);
m_StdDevs[i] = Math.sqrt(input.variance(i));
}
}
// Convert pending input instances
for (int i = 0; i < input.numInstances(); i++) {
convertInstance(input.instance(i));
}
}
// Free memory
flushInput();
m_NewBatch = true;
return (numPendingOutput() != 0);
}
/**
* Accept an instance for processing by StreamableFilters only
*
* @param e an <code>InstanceEvent</code> value
*/
public void acceptInstance(InstanceEvent e) {
// to do!
if (m_filterThread != null) {
String messg =
Messages.getInstance().getString("Filter_AcceptInstance_Mess_Text_First")
+ statusMessagePrefix()
+ Messages.getInstance().getString("Filter_AcceptInstance_Mess_Text_Second");
if (m_log != null) {
m_log.logMessage(messg);
m_log.statusMessage(
statusMessagePrefix()
+ Messages.getInstance()
.getString("Filter_AcceptInstance_StatusMessage_Text_First"));
} else {
System.err.println(messg);
}
return;
}
if (!(m_Filter instanceof StreamableFilter)) {
stop(); // stop all processing
if (m_log != null) {
m_log.logMessage(
Messages.getInstance().getString("Filter_AcceptInstance_LogMessage_Text_First")
+ statusMessagePrefix()
+ Messages.getInstance().getString("Filter_AcceptInstance_LogMessage_Text_Second")
+ m_Filter.getClass().getName()
+ Messages.getInstance().getString("Filter_AcceptInstance_LogMessage_Text_Third"));
m_log.statusMessage(
statusMessagePrefix()
+ Messages.getInstance()
.getString("Filter_AcceptInstance_StatusMessage_Text_Second"));
}
return;
}
if (e.getStatus() == InstanceEvent.FORMAT_AVAILABLE) {
try {
m_instanceCount = 0;
// notifyInstanceListeners(e);
// Instances dataset = e.getInstance().dataset();
Instances dataset = e.getStructure();
if (m_Filter instanceof SupervisedFilter) {
// defualt to last column if no class is set
if (dataset.classIndex() < 0) {
dataset.setClassIndex(dataset.numAttributes() - 1);
}
}
// initialize filter
m_Filter.setInputFormat(dataset);
// attempt to determine post-filtering
// structure. If successful this can be passed on to instance
// listeners as a new FORMAT_AVAILABLE event.
m_structurePassedOn = false;
try {
if (m_Filter.isOutputFormatDefined()) {
// System.err.println("Filter - passing on output format...");
// System.err.println(m_Filter.getOutputFormat());
m_ie.setStructure(m_Filter.getOutputFormat());
notifyInstanceListeners(m_ie);
m_structurePassedOn = true;
}
} catch (Exception ex) {
stop(); // stop all processing
if (m_log != null) {
m_log.logMessage(
Messages.getInstance().getString("Filter_AcceptInstance_LogMessage_Text_Fourth")
+ statusMessagePrefix()
+ Messages.getInstance()
.getString("Filter_AcceptInstance_LogMessage_Text_Fifth")
+ ex.getMessage());
m_log.statusMessage(
statusMessagePrefix()
+ Messages.getInstance()
.getString("Filter_AcceptInstance_StatusMessage_Text_Third"));
} else {
System.err.println(
Messages.getInstance().getString("Filter_AcceptInstance_Error_Text_First")
+ statusMessagePrefix()
+ Messages.getInstance().getString("Filter_AcceptInstance_Error_Text_Second"));
}
}
} catch (Exception ex) {
ex.printStackTrace();
}
return;
}
if (e.getStatus() == InstanceEvent.BATCH_FINISHED) {
// get the last instance (if available)
try {
if (m_log != null) {
m_log.statusMessage(
statusMessagePrefix()
+ Messages.getInstance()
.getString("Filter_AcceptInstance_StatusMessage_Text_Fourth"));
}
if (m_Filter.input(e.getInstance())) {
Instance filteredInstance = m_Filter.output();
if (filteredInstance != null) {
if (!m_structurePassedOn) {
// pass on the new structure first
m_ie.setStructure(new Instances(filteredInstance.dataset(), 0));
notifyInstanceListeners(m_ie);
m_structurePassedOn = true;
}
m_ie.setInstance(filteredInstance);
// if there are instances pending for output don't want to send
// a batch finisehd at this point...
// System.err.println("Filter - in batch finisehd...");
if (m_Filter.batchFinished() && m_Filter.numPendingOutput() > 0) {
m_ie.setStatus(InstanceEvent.INSTANCE_AVAILABLE);
} else {
m_ie.setStatus(e.getStatus());
}
notifyInstanceListeners(m_ie);
}
}
if (m_log != null) {
m_log.statusMessage(
statusMessagePrefix()
+ Messages.getInstance()
.getString("Filter_AcceptInstance_StatusMessage_Text_Fourth_Alpha"));
}
} catch (Exception ex) {
stop(); // stop all processing
if (m_log != null) {
m_log.logMessage(
Messages.getInstance().getString("Filter_AcceptInstance_LogMessage_Text_Sixth")
+ statusMessagePrefix()
+ ex.getMessage());
m_log.statusMessage(
statusMessagePrefix()
+ Messages.getInstance()
.getString("Filter_AcceptInstance_StatusMessage_Text_Fifth"));
}
ex.printStackTrace();
}
// check for any pending instances that we might need to pass on
try {
if (m_Filter.batchFinished() && m_Filter.numPendingOutput() > 0) {
if (m_log != null) {
m_log.statusMessage(
statusMessagePrefix()
+ Messages.getInstance()
.getString("Filter_AcceptInstance_StatusMessage_Text_Sixth"));
}
Instance filteredInstance = m_Filter.output();
if (filteredInstance != null) {
if (!m_structurePassedOn) {
// pass on the new structure first
m_ie.setStructure(new Instances(filteredInstance.dataset(), 0));
notifyInstanceListeners(m_ie);
m_structurePassedOn = true;
}
m_ie.setInstance(filteredInstance);
// TODO here is the problem I think
m_ie.setStatus(InstanceEvent.INSTANCE_AVAILABLE);
notifyInstanceListeners(m_ie);
}
while (m_Filter.numPendingOutput() > 0) {
filteredInstance = m_Filter.output();
m_ie.setInstance(filteredInstance);
// System.err.println("Filter - sending pending...");
if (m_Filter.numPendingOutput() == 0) {
m_ie.setStatus(InstanceEvent.BATCH_FINISHED);
} else {
m_ie.setStatus(InstanceEvent.INSTANCE_AVAILABLE);
}
notifyInstanceListeners(m_ie);
}
if (m_log != null) {
m_log.statusMessage(
statusMessagePrefix()
+ Messages.getInstance()
.getString("Filter_AcceptInstance_StatusMessage_Text_Seventh"));
}
}
} catch (Exception ex) {
stop(); // stop all processing
if (m_log != null) {
m_log.logMessage(
Messages.getInstance().getString("Filter_AcceptInstance_LogMessage_Text_Seventh")
+ statusMessagePrefix()
+ ex.toString());
m_log.statusMessage(
statusMessagePrefix()
+ Messages.getInstance()
.getString("Filter_AcceptInstance_StatusMessage_Text_Eighth"));
}
ex.printStackTrace();
}
} else {
// pass instance through the filter
try {
if (!m_Filter.input(e.getInstance())) {
// System.err.println("Filter - inputing instance into filter...");
/* if (m_log != null) {
m_log.logMessage("ERROR : filter not ready to output instance");
} */
// quietly return. Filter might be able to output some instances
// once the batch is finished.
return;
}
// collect output instance.
Instance filteredInstance = m_Filter.output();
if (filteredInstance == null) {
return;
}
m_instanceCount++;
if (!m_structurePassedOn) {
// pass on the new structure first
m_ie.setStructure(new Instances(filteredInstance.dataset(), 0));
notifyInstanceListeners(m_ie);
m_structurePassedOn = true;
}
m_ie.setInstance(filteredInstance);
m_ie.setStatus(e.getStatus());
if (m_log != null && (m_instanceCount % 10000 == 0)) {
m_log.statusMessage(
statusMessagePrefix()
+ Messages.getInstance()
.getString("Filter_AcceptInstance_StatusMessage_Text_Nineth")
+ m_instanceCount
+ Messages.getInstance()
.getString("Filter_AcceptInstance_StatusMessage_Text_Tenth"));
}
notifyInstanceListeners(m_ie);
} catch (Exception ex) {
stop(); // stop all processing
if (m_log != null) {
m_log.logMessage(
Messages.getInstance().getString("Filter_AcceptInstance_LogMessage_Text_Eighth")
+ statusMessagePrefix()
+ ex.toString());
m_log.statusMessage(
statusMessagePrefix()
+ Messages.getInstance()
.getString("Filter_AcceptInstance_StatusMessage_Text_Eleventh"));
}
ex.printStackTrace();
}
}
}
/**
* Returns a string that describes the filter as source. The filter will be contained in a class
* with the given name (there may be auxiliary classes), and will contain two methods with these
* signatures:
*
* <pre><code>
* // converts one row
* public static Object[] filter(Object[] i);
* // converts a full dataset (first dimension is row index)
* public static Object[][] filter(Object[][] i);
* </code></pre>
*
* where the array <code>i</code> contains elements that are either Double, String, with missing
* values represented as null. The generated code is public domain and comes with no warranty.
*
* @param className the name that should be given to the source class.
* @param data the dataset used for initializing the filter
* @return the object source described by a string
* @throws Exception if the source can't be computed
*/
public String toSource(String className, Instances data) throws Exception {
StringBuffer result;
boolean[] process;
int i;
result = new StringBuffer();
// determine what attributes were processed
process = new boolean[data.numAttributes()];
for (i = 0; i < data.numAttributes(); i++) {
process[i] = (data.attribute(i).isNumeric() && (i != data.classIndex()));
}
result.append("class " + className + " {\n");
result.append("\n");
result.append(" /** lists which attributes will be processed */\n");
result.append(
" protected final static boolean[] PROCESS = new boolean[]{"
+ Utils.arrayToString(process)
+ "};\n");
result.append("\n");
result.append(" /** the computed means */\n");
result.append(
" protected final static double[] MEANS = new double[]{"
+ Utils.arrayToString(m_Means)
+ "};\n");
result.append("\n");
result.append(" /** the computed standard deviations */\n");
result.append(
" protected final static double[] STDEVS = new double[]{"
+ Utils.arrayToString(m_StdDevs)
+ "};\n");
result.append("\n");
result.append(" /**\n");
result.append(" * filters a single row\n");
result.append(" * \n");
result.append(" * @param i the row to process\n");
result.append(" * @return the processed row\n");
result.append(" */\n");
result.append(" public static Object[] filter(Object[] i) {\n");
result.append(" Object[] result;\n");
result.append("\n");
result.append(" result = new Object[i.length];\n");
result.append(" for (int n = 0; n < i.length; n++) {\n");
result.append(" if (PROCESS[n] && (i[n] != null)) {\n");
result.append(" if (STDEVS[n] > 0)\n");
result.append(" result[n] = (((Double) i[n]) - MEANS[n]) / STDEVS[n];\n");
result.append(" else\n");
result.append(" result[n] = ((Double) i[n]) - MEANS[n];\n");
result.append(" }\n");
result.append(" else {\n");
result.append(" result[n] = i[n];\n");
result.append(" }\n");
result.append(" }\n");
result.append("\n");
result.append(" return result;\n");
result.append(" }\n");
result.append("\n");
result.append(" /**\n");
result.append(" * filters multiple rows\n");
result.append(" * \n");
result.append(" * @param i the rows to process\n");
result.append(" * @return the processed rows\n");
result.append(" */\n");
result.append(" public static Object[][] filter(Object[][] i) {\n");
result.append(" Object[][] result;\n");
result.append("\n");
result.append(" result = new Object[i.length][];\n");
result.append(" for (int n = 0; n < i.length; n++) {\n");
result.append(" result[n] = filter(i[n]);\n");
result.append(" }\n");
result.append("\n");
result.append(" return result;\n");
result.append(" }\n");
result.append("}\n");
return result.toString();
}