| /* ==================================================================== |
| Licensed to the Apache Software Foundation (ASF) under one or more |
| contributor license agreements. See the NOTICE file distributed with |
| this work for additional information regarding copyright ownership. |
| The ASF licenses this file to You under the Apache License, Version 2.0 |
| (the "License"); you may not use this file except in compliance with |
| the License. You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| See the License for the specific language governing permissions and |
| limitations under the License. |
| ==================================================================== */ |
| |
| package org.apache.poi.ss.formula.udf; |
| |
| import org.apache.poi.ss.formula.atp.AnalysisToolPak; |
| import org.apache.poi.ss.formula.functions.FreeRefFunction; |
| |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.Collection; |
| |
| /** |
| * Collects add-in libraries and VB macro functions together into one UDF finder |
| * |
| * @author PUdalau |
| */ |
| public class AggregatingUDFFinder implements UDFFinder { |
| |
| /** |
| * Default UDFFinder implementation |
| */ |
| public static final UDFFinder DEFAULT = new AggregatingUDFFinder(AnalysisToolPak.instance); |
| |
| private final Collection<UDFFinder> _usedToolPacks; |
| |
| public AggregatingUDFFinder(UDFFinder ... usedToolPacks) { |
| _usedToolPacks = new ArrayList<>(usedToolPacks.length); |
| _usedToolPacks.addAll(Arrays.asList(usedToolPacks)); |
| } |
| |
| /** |
| * Returns executor by specified name. Returns <code>null</code> if |
| * function isn't contained by any registered tool pack. |
| * |
| * @param name Name of function. |
| * @return Function executor. <code>null</code> if not found |
| */ |
| @Override |
| public FreeRefFunction findFunction(String name) { |
| FreeRefFunction evaluatorForFunction; |
| for (UDFFinder pack : _usedToolPacks) { |
| evaluatorForFunction = pack.findFunction(name); |
| if (evaluatorForFunction != null) { |
| return evaluatorForFunction; |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * Add a new toolpack |
| * |
| * @param toolPack the UDF toolpack to add |
| */ |
| public void add(UDFFinder toolPack){ |
| _usedToolPacks.add(toolPack); |
| } |
| } |