/**
* Subclasses might override this method to define the meta data transformation performed by this
* operator. The default implementation takes all attributes specified by the {@link
* AttributeSubsetSelector} and passes them to {@link #modifyAttributeMetaData(ExampleSetMetaData,
* AttributeMetaData)} and replaces them accordingly.
*
* @throws UndefinedParameterError
*/
@Override
protected ExampleSetMetaData modifyMetaData(ExampleSetMetaData exampleSetMetaData)
throws UndefinedParameterError {
ExampleSetMetaData subsetMetaData =
attributeSelector.getMetaDataSubset(exampleSetMetaData, isSupportingAttributeRoles());
checkSelectedSubsetMetaData(subsetMetaData);
for (AttributeMetaData amd : subsetMetaData.getAllAttributes()) {
Collection<AttributeMetaData> replacement = null;
replacement = modifyAttributeMetaData(exampleSetMetaData, amd);
if (replacement != null) {
if (replacement.size() == 1) {
AttributeMetaData replacementAttribute = replacement.iterator().next();
replacementAttribute.setRole(
exampleSetMetaData.getAttributeByName(amd.getName()).getRole());
}
exampleSetMetaData.removeAttribute(amd);
exampleSetMetaData.addAllAttributes(replacement);
}
}
return exampleSetMetaData;
}
private ExampleSetMetaData applyRulesOnMetaData(
List<String> rules, MetaData metaData, FilterConditon condition)
throws UndefinedParameterError {
if (metaData == null || !(metaData instanceof ExampleSetMetaData) || condition == null) {
return new ExampleSetMetaData();
}
ExampleSetMetaData sortedMetaData = new ExampleSetMetaData();
ExampleSetMetaData originalMetaData = (ExampleSetMetaData) metaData;
Collection<AttributeMetaData> allAttributes = originalMetaData.getAllAttributes();
// iterate over all rules
for (String currentRule : rules) {
// iterate over all original attributes and check if rule applies
Iterator<AttributeMetaData> iterator = allAttributes.iterator();
while (iterator.hasNext()) {
AttributeMetaData attrMD = iterator.next();
// skip special attributes
if (attrMD.isSpecial()) {
continue;
}
// if rule applies, remove attribute from unmachted list and add it to rules matched
// list
if (condition.match(currentRule, attrMD.getName())) {
iterator.remove();
sortedMetaData.addAttribute(attrMD);
}
}
}
if (!getParameterAsString(PARAMETER_HANDLE_UNMATCHED_ATTRIBUTES)
.equals(REMOVE_UNMATCHED_MODE)) {
sortedMetaData.addAllAttributes(allAttributes);
}
return sortedMetaData;
}
