/**
* 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);
}
/**
* Copies string/relational values contained in the instance copied to a new dataset. The Instance
* must already be assigned to a dataset. This dataset and the destination dataset must have the
* same structure.
*
* @param instance the Instance containing the string/relational values to copy.
* @param isInput if true the input format and input attribute locators are used otherwise the
* output format and output locators
*/
protected void copyValues(Instance instance, boolean isInput) {
RelationalLocator.copyRelationalValues(
instance,
(isInput) ? m_InputFormat : m_OutputFormat,
(isInput) ? m_InputRelAtts : m_OutputRelAtts);
StringLocator.copyStringValues(
instance,
(isInput) ? m_InputFormat : m_OutputFormat,
(isInput) ? m_InputStringAtts : m_OutputStringAtts);
}
/**
* Takes string/relational values referenced by an Instance and copies them from a source dataset
* to a destination dataset. The instance references are updated to be valid for the destination
* dataset. The instance may have the structure (i.e. number and attribute position) of either
* dataset (this affects where references are obtained from). Only works if the number of
* string/relational attributes is the same in both indices (implicitly these string/relational
* attributes should be semantically same but just with shifted positions).
*
* @param instance the instance containing references to strings/ relational values in the source
* dataset that will have references updated to be valid for the destination dataset.
* @param instSrcCompat true if the instance structure is the same as the source, or false if it
* is the same as the destination (i.e. which of the string/relational attribute indices
* contains the correct locations for this instance).
* @param srcDataset the dataset for which the current instance string/relational value references
* are valid (after any position mapping if needed)
* @param destDataset the dataset for which the current instance string/relational value
* references need to be inserted (after any position mapping if needed)
*/
protected void copyValues(
Instance instance, boolean instSrcCompat, Instances srcDataset, Instances destDataset) {
RelationalLocator.copyRelationalValues(
instance, instSrcCompat,
srcDataset, m_InputRelAtts,
destDataset, m_OutputRelAtts);
StringLocator.copyStringValues(
instance,
instSrcCompat,
srcDataset,
m_InputStringAtts,
getOutputFormat(),
m_OutputStringAtts);
}