hssfformulaevaluator.java

java 读写word excel ppt

                AreaPtg ap = (AreaPtg) ptgs[i];
                short row0 = ap.getFirstRow();
                short col0 = ap.getFirstColumn();
                short row1 = ap.getLastRow();
                short col1 = ap.getLastColumn();
                ValueEval[] values = new ValueEval[(row1 - row0 + 1) * (col1 - col0 + 1)];
                for (short x = row0; sheet != null && x < row1 + 1; x++) {
                    HSSFRow row = sheet.getRow(x);
                    for (short y = col0; row != null && y < col1 + 1; y++) {
                        values[(x - row0) * (col1 - col0 + 1) + (y - col0)] = 
                            getEvalForCell(row.getCell(y), row, sheet, workbook);
                    }
                }
                AreaEval ae = new Area2DEval(ap, values);
                stack.push(ae);
            }
            else if (ptgs[i] instanceof Area3DPtg) {
                Area3DPtg a3dp = (Area3DPtg) ptgs[i];
                short row0 = a3dp.getFirstRow();
                short col0 = a3dp.getFirstColumn();
                short row1 = a3dp.getLastRow();
                short col1 = a3dp.getLastColumn();
                HSSFSheet xsheet = workbook.getSheetAt(a3dp.getExternSheetIndex());
                ValueEval[] values = new ValueEval[(row1 - row0 + 1) * (col1 - col0 + 1)];
                for (short x = row0; sheet != null && x < row1 + 1; x++) {
                    HSSFRow row = sheet.getRow(x);
                    for (short y = col0; row != null && y < col1 + 1; y++) {
                        values[(x - row0) * (col1 - col0 + 1) + (y - col0)] = 
                            getEvalForCell(row.getCell(y), row, xsheet, workbook);
                    }
                }
                AreaEval ae = new Area3DEval(a3dp, values);
                stack.push(ae);
            }
            else {
                Eval ptgEval = getEvalForPtg(ptgs[i]);
                stack.push(ptgEval);
            }
        }
        ValueEval value = ((ValueEval) stack.pop());
        if (value instanceof RefEval) {
            RefEval rv = (RefEval) value;
            value = rv.getInnerValueEval();
        }
        else if (value instanceof AreaEval) {
            AreaEval ae = (AreaEval) value;
            if (ae.isRow()) 
                value = ae.getValueAt(ae.getFirstRow(), srcColNum);
            else if (ae.isColumn()) 
                value = ae.getValueAt(srcRowNum, ae.getFirstColumn());
            else
                value = ErrorEval.VALUE_INVALID;
        }
        return value;
    }

    /**
     * returns the OperationEval concrete impl instance corresponding
     * to the suplied operationPtg
     * @param ptg
     * @return
     */
    protected static Eval getOperationEvalForPtg(OperationPtg ptg) {
        Eval retval = null;

        Class clazz = (Class) OPERATION_EVALS_MAP.get(ptg.getClass());
        try {
            Constructor constructor = clazz.getConstructor(OPERATION_CONSTRUCTOR_CLASS_ARRAY);
            retval = (OperationEval) constructor.newInstance(new Ptg[] { ptg });
        }
        catch (Exception e) {
            throw new RuntimeException("Fatal Error: ", e);
        }
        return retval;
    }

    /**
     * returns an appropriate Eval impl instance for the Ptg. The Ptg must be
     * one of: Area3DPtg, AreaPtg, ReferencePtg, Ref3DPtg, IntPtg, NumberPtg,
     * StringPtg, BoolPtg <br/>special Note: OperationPtg subtypes cannot be
     * passed here!
     * 
     * @param ptg
     * @return
     */
    protected static Eval getEvalForPtg(Ptg ptg) {
        Eval retval = null;

        Class clazz = (Class) VALUE_EVALS_MAP.get(ptg.getClass());
        try {
            if (ptg instanceof Area3DPtg) {
                Constructor constructor = clazz.getConstructor(AREA3D_CONSTRUCTOR_CLASS_ARRAY);
                retval = (OperationEval) constructor.newInstance(new Ptg[] { ptg });
            }
            else if (ptg instanceof AreaPtg) {
                Constructor constructor = clazz.getConstructor(AREA3D_CONSTRUCTOR_CLASS_ARRAY);
                retval = (OperationEval) constructor.newInstance(new Ptg[] { ptg });
            }
            else if (ptg instanceof ReferencePtg) {
                Constructor constructor = clazz.getConstructor(REFERENCE_CONSTRUCTOR_CLASS_ARRAY);
                retval = (OperationEval) constructor.newInstance(new Ptg[] { ptg });
            }
            else if (ptg instanceof Ref3DPtg) {
                Constructor constructor = clazz.getConstructor(REF3D_CONSTRUCTOR_CLASS_ARRAY);
                retval = (OperationEval) constructor.newInstance(new Ptg[] { ptg });
            }
            else {
                if (ptg instanceof IntPtg || ptg instanceof NumberPtg || ptg instanceof StringPtg
                        || ptg instanceof BoolPtg) {
                    Constructor constructor = clazz.getConstructor(VALUE_CONTRUCTOR_CLASS_ARRAY);
                    retval = (ValueEval) constructor.newInstance(new Ptg[] { ptg });
                }
            }
        }
        catch (Exception e) {
            throw new RuntimeException("Fatal Error: ", e);
        }
        return retval;

    }

    /**
     * Given a cell, find its type and from that create an appropriate ValueEval
     * impl instance and return that. Since the cell could be an external
     * reference, we need the sheet that this belongs to.
     * Non existent cells are treated as empty.
     * @param cell
     * @param sheet
     * @param workbook
     * @return
     */
    protected static ValueEval getEvalForCell(HSSFCell cell, HSSFRow row, HSSFSheet sheet, HSSFWorkbook workbook) {
        ValueEval retval = BlankEval.INSTANCE;
        if (cell != null) {
            switch (cell.getCellType()) {
            case HSSFCell.CELL_TYPE_NUMERIC:
                retval = new NumberEval(cell.getNumericCellValue());
                break;
            case HSSFCell.CELL_TYPE_STRING:
                retval = new StringEval(cell.getRichStringCellValue().getString());
                break;
            case HSSFCell.CELL_TYPE_FORMULA:
                retval = internalEvaluate(cell, row, sheet, workbook);
                break;
            case HSSFCell.CELL_TYPE_BOOLEAN:
                retval = cell.getBooleanCellValue() ? BoolEval.TRUE : BoolEval.FALSE;
                break;
            case HSSFCell.CELL_TYPE_BLANK:
                retval = BlankEval.INSTANCE;
                break;
            case HSSFCell.CELL_TYPE_ERROR:
                retval = ErrorEval.UNKNOWN_ERROR; // TODO: think about this...
                break;
            }
        }
        return retval;
    }

    /**
     * create a Ref2DEval for ReferencePtg and push it on the stack.
     * Non existent cells are treated as RefEvals containing BlankEval.
     * @param ptg
     * @param stack
     * @param cell
     * @param sheet
     * @param workbook
     */
    protected static void pushRef2DEval(ReferencePtg ptg, Stack stack, 
            HSSFCell cell, HSSFRow row, HSSFSheet sheet, HSSFWorkbook workbook) {
        if (cell != null)
            switch (cell.getCellType()) {
            case HSSFCell.CELL_TYPE_NUMERIC:
                stack.push(new Ref2DEval(ptg, new NumberEval(cell.getNumericCellValue()), false));
                break;
            case HSSFCell.CELL_TYPE_STRING:
                stack.push(new Ref2DEval(ptg, new StringEval(cell.getRichStringCellValue().getString()), false));
                break;
            case HSSFCell.CELL_TYPE_FORMULA:
                stack.push(new Ref2DEval(ptg, internalEvaluate(cell, row, sheet, workbook), true));
                break;
            case HSSFCell.CELL_TYPE_BOOLEAN:
                stack.push(new Ref2DEval(ptg, cell.getBooleanCellValue() ? BoolEval.TRUE : BoolEval.FALSE, false));
                break;
            case HSSFCell.CELL_TYPE_BLANK:
                stack.push(new Ref2DEval(ptg, BlankEval.INSTANCE, false));
                break;
            case HSSFCell.CELL_TYPE_ERROR:
                stack.push(new Ref2DEval(ptg, ErrorEval.UNKNOWN_ERROR, false)); // TODO: think abt this
                break;
            }
        else {
            stack.push(new Ref2DEval(ptg, BlankEval.INSTANCE, false));
        }
    }

    /**
     * create a Ref3DEval for Ref3DPtg and push it on the stack.
     * 
     * @param ptg
     * @param stack
     * @param cell
     * @param sheet
     * @param workbook
     */
    protected static void pushRef3DEval(Ref3DPtg ptg, Stack stack, HSSFCell cell, 
            HSSFRow row, HSSFSheet sheet, HSSFWorkbook workbook) {
        if (cell != null)
            switch (cell.getCellType()) {
            case HSSFCell.CELL_TYPE_NUMERIC:
                stack.push(new Ref3DEval(ptg, new NumberEval(cell.getNumericCellValue()), false));
                break;
            case HSSFCell.CELL_TYPE_STRING:
                stack.push(new Ref3DEval(ptg, new StringEval(cell.getRichStringCellValue().getString()), false));
                break;
            case HSSFCell.CELL_TYPE_FORMULA:
                stack.push(new Ref3DEval(ptg, internalEvaluate(cell, row, sheet, workbook), true));
                break;
            case HSSFCell.CELL_TYPE_BOOLEAN:
                stack.push(new Ref3DEval(ptg, cell.getBooleanCellValue() ? BoolEval.TRUE : BoolEval.FALSE, false));
                break;
            case HSSFCell.CELL_TYPE_BLANK:
                stack.push(new Ref3DEval(ptg, BlankEval.INSTANCE, false));
                break;
            case HSSFCell.CELL_TYPE_ERROR:
                stack.push(new Ref3DEval(ptg, ErrorEval.UNKNOWN_ERROR, false)); // TODO: think abt this
                break;
            }
        else {
            stack.push(new Ref3DEval(ptg, BlankEval.INSTANCE, false));
        }
    }
    
    /**
     * Mimics the 'data view' of a cell. This allows formula evaluator 
     * to return a CellValue instead of precasting the value to String
     * or Number or boolean type.
     * @author Amol S. Deshmukh &lt; amolweb at ya hoo dot com &gt;
     */
    public static final class CellValue {
        private int cellType;
        private HSSFRichTextString richTextStringValue;
        private double numberValue;
        private boolean booleanValue;
        private byte errorValue;
        
        /**
         * CellType should be one of the types defined in HSSFCell
         * @param cellType
         */
        public CellValue(int cellType) {
            super();
            this.cellType = cellType;
        }
        /**
         * @return Returns the booleanValue.
         */
        public boolean getBooleanValue() {
            return booleanValue;
        }
        /**
         * @param booleanValue The booleanValue to set.
         */
        public void setBooleanValue(boolean booleanValue) {
            this.booleanValue = booleanValue;
        }
        /**
         * @return Returns the numberValue.
         */
        public double getNumberValue() {
            return numberValue;
        }
        /**
         * @param numberValue The numberValue to set.
         */
        public void setNumberValue(double numberValue) {
            this.numberValue = numberValue;
        }
        /**
         * @return Returns the stringValue. This method is deprecated, use
         * getRichTextStringValue instead
         * @deprecated
         */
        public String getStringValue() {
            return richTextStringValue.getString();
        }
        /**
         * @param stringValue The stringValue to set. This method is deprecated, use
         * getRichTextStringValue instead.
         * @deprecated
         */
        public void setStringValue(String stringValue) {
            this.richTextStringValue = new HSSFRichTextString(stringValue);
        }
        /**
         * @return Returns the cellType.
         */
        public int getCellType() {
            return cellType;
        }
        /**
         * @return Returns the errorValue.
         */
        public byte getErrorValue() {
            return errorValue;
        }
        /**
         * @param errorValue The errorValue to set.
         */
        public void setErrorValue(byte errorValue) {
            this.errorValue = errorValue;
        }
        /**
         * @return Returns the richTextStringValue.
         */
		public HSSFRichTextString getRichTextStringValue() {
			return richTextStringValue;
		}
        /**
         * @param richTextStringValue The richTextStringValue to set.
         */
		public void setRichTextStringValue(HSSFRichTextString richTextStringValue) {
			this.richTextStringValue = richTextStringValue;
		}
    }

    /**
     * debug method
     * 
     * @param formula
     * @param sheet
     * @param workbook
     */
    void inspectPtgs(String formula) {
        FormulaParser fp = new FormulaParser(formula, workbook.getWorkbook());
        fp.parse();
        Ptg[] ptgs = fp.getRPNPtg();
        System.out.println("<ptg-group>");
        for (int i = 0, iSize = ptgs.length; i < iSize; i++) {
            System.out.println("<ptg>");
            System.out.println(ptgs[i]);
            if (ptgs[i] instanceof OperationPtg) {
                System.out.println("numoperands: " + ((OperationPtg) ptgs[i]).getNumberOfOperands());
            }
            System.out.println("</ptg>");
        }
        System.out.println("</ptg-group>");
    }

}