public BaseArrayProvider(
DimensionSelector dimSelector, TopNQuery query, Capabilities capabilities) {
this.dimSelector = dimSelector;
this.query = query;
this.capabilities = capabilities;
previousStop = null;
ignoreAfterThreshold = false;
ignoreFirstN = 0;
keepOnlyN = dimSelector.getValueCardinality();
}
public BaseArrayProvider(
DimensionSelector dimSelector, TopNQuery query, Capabilities capabilities) {
this.dimSelector = dimSelector;
this.query = query;
this.capabilities = capabilities;
previousStop = null;
ignoreAfterThreshold = false;
ignoreFirstN = 0;
keepOnlyN = dimSelector.getValueCardinality();
if (keepOnlyN < 0) {
throw new UnsupportedOperationException("Cannot operate on a dimension with no dictionary");
}
}
@Override
public DimensionSelector decorate(final DimensionSelector selector) {
if (selector == null) {
return selector;
}
int count = 0;
final Map<Integer, Integer> forwardMapping = new HashMap<>();
for (int i = 0; i < selector.getValueCardinality(); i++) {
if (compiledRegex.matcher(Strings.nullToEmpty(selector.lookupName(i))).matches()) {
forwardMapping.put(i, count++);
}
}
final int[] reverseMapping = new int[forwardMapping.size()];
for (Map.Entry<Integer, Integer> e : forwardMapping.entrySet()) {
reverseMapping[e.getValue().intValue()] = e.getKey().intValue();
}
return BaseFilteredDimensionSpec.decorate(selector, forwardMapping, reverseMapping);
}