Examples of org.apache.poi.ss.formula.functions.FreeRefFunction

Package org.apache.poi.ss.formula.functions

Examples of org.apache.poi.ss.formula.functions.FreeRefFunction

org.apache.poi.ss.formula.functions.FreeRefFunction
For most Excel functions, involving references ((cell, area), (2d, 3d)), the references are passed in as arguments, and the exact location remains fixed. However, a select few Excel functions have the ability to access cells that were not part of any reference passed as an argument.
Two important functions with this feature are INDIRECT and OFFSET
When POI evaluates formulas, each reference argument is capable of evaluating any cell inside its range. Actually, even cells outside the reference range but on the same sheet can be evaluated. This allows OFFSET to be implemented like most other functions - taking only the arguments, and source cell coordinates. For the moment this interface only exists to serve the INDIRECT which can decode arbitrary text into cell references, and evaluate them.. @author Josh Micich


    public void testAddNameX(){
        InternalWorkbook wb = TestHSSFWorkbook.getInternalWorkbook(new HSSFWorkbook());
        assertNotNull(wb.getNameXPtg("ISODD", UDFFinder.DEFAULT));


        FreeRefFunction NotImplemented = new FreeRefFunction() {
            public ValueEval evaluate(ValueEval[] args, OperationEvaluationContext ec) {
                throw new RuntimeException("not implemented");
            }
        };

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        super(usedToolPacks);
        _funcMap = new HashMap<Integer, String>();
    }


    public FreeRefFunction findFunction(String name) {
        FreeRefFunction func = super.findFunction(name);
        if (func != null) {
            int idx = getFunctionIndex(name);
            _funcMap.put(idx, name);
        }
        return func;

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        Iterator<String> keysIt = xlsMacroList.keySet().iterator();
        int x = 0;
        while (keysIt.hasNext()) {
            String name = keysIt.next();
            FreeRefFunction function = xlsMacroList.get(name);
            names[x] = name;
            functions[x] = function;
        }


        UDFFinder udff1 = new DefaultUDFFinder(names, functions);

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        return m;
    }


    private static void r(Map<String, FreeRefFunction> m, String functionName, FreeRefFunction pFunc) {
        FreeRefFunction func = pFunc == null ? new NotImplemented(functionName) : pFunc;
        m.put(functionName, func);
    }

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     */
    public static Collection<String> getSupportedFunctionNames(){
        AnalysisToolPak inst = (AnalysisToolPak)instance;
        Collection<String> lst = new TreeSet<String>();
        for(String name : inst._functionsByName.keySet()){
            FreeRefFunction func = inst._functionsByName.get(name);
            if(func != null && !(func instanceof NotImplemented)){
                lst.add(name);
            }
        }
        return Collections.unmodifiableCollection(lst);

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     */
    public static Collection<String> getNotSupportedFunctionNames(){
        AnalysisToolPak inst = (AnalysisToolPak)instance;
        Collection<String> lst = new TreeSet<String>();
        for(String name : inst._functionsByName.keySet()){
            FreeRefFunction func = inst._functionsByName.get(name);
            if(func != null && (func instanceof NotImplemented)){
                lst.add(name);
            }
        }
        return Collections.unmodifiableCollection(lst);

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                        "Use FunctoinEval.registerFunction(String name, Function func) instead.");
            }


            throw new IllegalArgumentException(name + " is not a function from the Excel Analysis Toolpack.");
        }
        FreeRefFunction f = inst.findFunction(name);
        if(f != null && !(f instanceof NotImplemented)) {
            throw new IllegalArgumentException("POI already implememts " + name +
                    ". You cannot override POI's implementations of Excel functions");
        }

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    }


    public NameXPxg getNameXPtg(String name, SheetIdentifier sheet) {
      // First, try to find it as a User Defined Function
        IndexedUDFFinder udfFinder = (IndexedUDFFinder)getUDFFinder();
        FreeRefFunction func = udfFinder.findFunction(name);
        if (func != null) {
            return new NameXPxg(null, name);
        }
        
        // Otherwise, try it as a named range

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     throw new RuntimeException("Not implemented yet");
  }


  public NameXPtg getNameXPtg(String name) {
        IndexedUDFFinder udfFinder = (IndexedUDFFinder)getUDFFinder();
        FreeRefFunction func = udfFinder.findFunction(name);
    if(func == null) return null;
        else return new NameXPtg(0, udfFinder.getFunctionIndex(name));
  }

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      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);
  }

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