/**
* This will remove all buffered instances from the inputformat dataset. Use this method rather
* than getInputFormat().delete();
*/
protected void flushInput() {
if ((m_InputStringAtts.getAttributeIndices().length > 0)
|| (m_InputRelAtts.getAttributeIndices().length > 0)) {
m_InputFormat = m_InputFormat.stringFreeStructure();
m_InputStringAtts = new StringLocator(m_InputFormat, m_InputStringAtts.getAllowedIndices());
m_InputRelAtts = new RelationalLocator(m_InputFormat, m_InputRelAtts.getAllowedIndices());
} else {
// This more efficient than new Instances(m_InputFormat, 0);
m_InputFormat.delete();
}
}
/**
* 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.
* Any subsequent instances filtered should be filtered based on setting obtained from the first
* batch (unless the inputFormat has been re-assigned or new options have been set). This default
* implementation assumes all instance processing occurs during inputFormat() and input().
*
* @return true if there are instances pending output
* @throws NullPointerException if no input structure has been defined,
* @throws Exception if there was a problem finishing the batch.
*/
public boolean batchFinished() throws Exception {
if (m_InputFormat == null) {
throw new NullPointerException("No input instance format defined");
}
flushInput();
m_NewBatch = true;
m_FirstBatchDone = true;
if (m_OutputQueue.empty()) {
// Clear out references to old strings/relationals occasionally
if ((m_OutputStringAtts.getAttributeIndices().length > 0)
|| (m_OutputRelAtts.getAttributeIndices().length > 0)) {
m_OutputFormat = m_OutputFormat.stringFreeStructure();
m_OutputStringAtts =
new StringLocator(m_OutputFormat, m_OutputStringAtts.getAllowedIndices());
}
}
return (numPendingOutput() != 0);
}
