org.apache.poi.hssf.record.formula.udf.AggregatingUDFFinder Maven / Gradle / Ivy
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package org.apache.poi.hssf.record.formula.udf;
import org.apache.poi.hssf.record.formula.functions.FreeRefFunction;
/**
* Collects add-in libraries and VB macro functions together into one UDF finder
*
* @author PUdalau
*/
public final class AggregatingUDFFinder implements UDFFinder {
private final UDFFinder[] _usedToolPacks;
public AggregatingUDFFinder(UDFFinder ... usedToolPacks) {
_usedToolPacks = usedToolPacks.clone();
}
/**
* Returns executor by specified name. Returns null if
* function isn't contained by any registered tool pack.
*
* @param name Name of function.
* @return Function executor. null if not found
*/
public FreeRefFunction findFunction(String name) {
FreeRefFunction evaluatorForFunction;
for (UDFFinder pack : _usedToolPacks) {
evaluatorForFunction = pack.findFunction(name);
if (evaluatorForFunction != null) {
return evaluatorForFunction;
}
}
return null;
}
}