| /* ==================================================================== |
| 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; |
| |
| import org.apache.poi.ss.formula.eval.FunctionNameEval; |
| import org.apache.poi.ss.formula.eval.NotImplementedFunctionException; |
| import org.apache.poi.ss.formula.eval.ValueEval; |
| import org.apache.poi.ss.formula.functions.FreeRefFunction; |
| /** |
| * |
| * Common entry point for all user-defined (non-built-in) functions (where |
| * {@code AbstractFunctionPtg.field_2_fnc_index} == 255) |
| */ |
| final class UserDefinedFunction implements FreeRefFunction { |
| |
| public static final FreeRefFunction instance = new UserDefinedFunction(); |
| |
| private UserDefinedFunction() { |
| // enforce singleton |
| } |
| |
| @Override |
| public ValueEval evaluate(ValueEval[] args, OperationEvaluationContext ec) { |
| int nIncomingArgs = args.length; |
| if(nIncomingArgs < 1) { |
| throw new RuntimeException("function name argument missing"); |
| } |
| |
| ValueEval nameArg = args[0]; |
| String functionName; |
| if (nameArg instanceof FunctionNameEval) { |
| functionName = ((FunctionNameEval) nameArg).getFunctionName(); |
| } else { |
| throw new RuntimeException("First argument should be a NameEval, but got (" |
| + nameArg.getClass().getName() + ")"); |
| } |
| FreeRefFunction targetFunc = ec.findUserDefinedFunction(functionName); |
| if (targetFunc == null) { |
| throw new NotImplementedFunctionException(functionName); |
| } |
| int nOutGoingArgs = nIncomingArgs -1; |
| ValueEval[] outGoingArgs = new ValueEval[nOutGoingArgs]; |
| System.arraycopy(args, 1, outGoingArgs, 0, nOutGoingArgs); |
| return targetFunc.evaluate(outGoingArgs, ec); |
| } |
| } |