acrofields.java

iText是一个能够快速产生PDF文件的java类库。iText的java类对于那些要产生包含文本

    }
    
    /**
     * Gets the list of export option values from fields of type list or combo.
     * If the field doesn't exist or the field type is not list or combo it will return
     * <CODE>null</CODE>.
     * @param fieldName the field name
     * @return the list of export option values from fields of type list or combo
     */    
    public String[] getListOptionExport(String fieldName) {
        return getListOption(fieldName, 0);
    }
    
    /**
     * Gets the list of display option values from fields of type list or combo.
     * If the field doesn't exist or the field type is not list or combo it will return
     * <CODE>null</CODE>.
     * @param fieldName the field name
     * @return the list of export option values from fields of type list or combo
     */    
    public String[] getListOptionDisplay(String fieldName) {
        return getListOption(fieldName, 1);
    }
    
    /**
     * Sets the option list for fields of type list or combo. One of <CODE>exportValues</CODE>
     * or <CODE>displayValues</CODE> may be <CODE>null</CODE> but not both. This method will only
     * set the list but will not set the value or appearance. For that, calling <CODE>setField()</CODE>
     * is required.
     * <p>
     * An example:
     * <p>
     * <PRE>
     * PdfReader pdf = new PdfReader("input.pdf");
     * PdfStamper stp = new PdfStamper(pdf, new FileOutputStream("output.pdf"));
     * AcroFields af = stp.getAcroFields();
     * af.setListOption("ComboBox", new String[]{"a", "b", "c"}, new String[]{"first", "second", "third"});
     * af.setField("ComboBox", "b");
     * stp.close();
     * </PRE>
     * @param fieldName the field name
     * @param exportValues the export values
     * @param displayValues the display values
     * @return <CODE>true</CODE> if the operation succeeded, <CODE>false</CODE> otherwise
     */    
    public boolean setListOption(String fieldName, String[] exportValues, String[] displayValues) {
        if (exportValues == null && displayValues == null)
            return false;
        if (exportValues != null && displayValues != null && exportValues.length != displayValues.length)
            throw new IllegalArgumentException("The export and the display array must have the same size.");
        int ftype = getFieldType(fieldName);
        if (ftype != FIELD_TYPE_COMBO && ftype != FIELD_TYPE_LIST)
            return false;
        Item fd = (Item)fields.get(fieldName);
        String[] sing = null;
        if (exportValues == null && displayValues != null)
            sing = displayValues;
        else if (exportValues != null && displayValues == null)
            sing = exportValues;
        PdfArray opt = new PdfArray();
        if (sing != null) {
            for (int k = 0; k < sing.length; ++k)
                opt.add(new PdfString(sing[k], PdfObject.TEXT_UNICODE));
        }
        else {
            for (int k = 0; k < exportValues.length; ++k) {
                PdfArray a = new PdfArray();
                a.add(new PdfString(exportValues[k], PdfObject.TEXT_UNICODE));
                a.add(new PdfString(displayValues[k], PdfObject.TEXT_UNICODE));
                opt.add(a);
            }
        }
        ((PdfDictionary)fd.values.get(0)).put(PdfName.OPT, opt);
        for (int j = 0; j < fd.merged.size(); ++j)
            ((PdfDictionary)fd.merged.get(j)).put(PdfName.OPT, opt);
        return true;
    }
    
    /**
     * Gets the field type. The type can be one of: <CODE>FIELD_TYPE_PUSHBUTTON</CODE>,
     * <CODE>FIELD_TYPE_CHECKBOX</CODE>, <CODE>FIELD_TYPE_RADIOBUTTON</CODE>,
     * <CODE>FIELD_TYPE_TEXT</CODE>, <CODE>FIELD_TYPE_LIST</CODE>,
     * <CODE>FIELD_TYPE_COMBO</CODE> or <CODE>FIELD_TYPE_SIGNATURE</CODE>.
     * <p>
     * If the field does not exist or is invalid it returns
     * <CODE>FIELD_TYPE_NONE</CODE>.
     * @param fieldName the field name
     * @return the field type
     */    
    public int getFieldType(String fieldName) {
        Item fd = getFieldItem(fieldName);
        if (fd == null)
            return FIELD_TYPE_NONE;
        PdfObject type = PdfReader.getPdfObject(((PdfDictionary)fd.merged.get(0)).get(PdfName.FT));
        if (type == null)
            return FIELD_TYPE_NONE;
        int ff = 0;
        PdfObject ffo = PdfReader.getPdfObject(((PdfDictionary)fd.merged.get(0)).get(PdfName.FF));
        if (ffo != null && ffo.type() == PdfObject.NUMBER)
            ff = ((PdfNumber)ffo).intValue();
        if (PdfName.BTN.equals(type)) {
            if ((ff & PdfFormField.FF_PUSHBUTTON) != 0)
                return FIELD_TYPE_PUSHBUTTON;
            if ((ff & PdfFormField.FF_RADIO) != 0)
                return FIELD_TYPE_RADIOBUTTON;
            else
                return FIELD_TYPE_CHECKBOX;
        }
        else if (PdfName.TX.equals(type)) {
            return FIELD_TYPE_TEXT;
        }
        else if (PdfName.CH.equals(type)) {
            if ((ff & PdfFormField.FF_COMBO) != 0)
                return FIELD_TYPE_COMBO;
            else
                return FIELD_TYPE_LIST;
        }
        else if (PdfName.SIG.equals(type)) {
            return FIELD_TYPE_SIGNATURE;
        }
        return FIELD_TYPE_NONE;
    }
    
    /**
     * Export the fields as a FDF.
     * @param writer the FDF writer
     */    
    public void exportAsFdf(FdfWriter writer) {
        for (Iterator it = fields.entrySet().iterator(); it.hasNext();) {
            Map.Entry entry = (Map.Entry)it.next();
            Item item = (Item)entry.getValue();
            String name = (String)entry.getKey();
            PdfObject v = PdfReader.getPdfObject(((PdfDictionary)item.merged.get(0)).get(PdfName.V));
            if (v == null)
                continue;
            String value = getField(name);
            if (lastWasString)
                writer.setFieldAsString(name, value);
            else
                writer.setFieldAsName(name, value);
        }
    }
    
    /**
     * Renames a field. Only the last part of the name can be renamed. For example,
     * if the original field is "ab.cd.ef" only the "ef" part can be renamed.
     * @param oldName the old field name
     * @param newName the new field name
     * @return <CODE>true</CODE> if the renaming was successful, <CODE>false</CODE>
     * otherwise
     */    
    public boolean renameField(String oldName, String newName) {
        int idx1 = oldName.lastIndexOf('.') + 1;
        int idx2 = newName.lastIndexOf('.') + 1;
        if (idx1 != idx2)
            return false;
        if (!oldName.substring(0, idx1).equals(newName.substring(0, idx2)))
            return false;
        if (fields.containsKey(newName))
            return false;
        Item item = (Item)fields.get(oldName);
        if (item == null)
            return false;
        newName = newName.substring(idx2);
        PdfString ss = new PdfString(newName, PdfObject.TEXT_UNICODE);
        for (int k = 0; k < item.merged.size(); ++k) {
            PdfDictionary dic = (PdfDictionary)item.values.get(k);
            dic.put(PdfName.T, ss);
            markUsed(dic);
            dic = (PdfDictionary)item.merged.get(k);
            dic.put(PdfName.T, ss);
        }
        fields.remove(oldName);
        fields.put(newName, item);
        return true;
    }
    
    public static Object[] splitDAelements(String da) {
        try {
            PRTokeniser tk = new PRTokeniser(PdfEncodings.convertToBytes(da, null));
            ArrayList stack = new ArrayList();
            Object ret[] = new Object[3];
            while (tk.nextToken()) {
                if (tk.getTokenType() == PRTokeniser.TK_COMMENT)
                    continue;
                if (tk.getTokenType() == PRTokeniser.TK_OTHER) {
                    String operator = tk.getStringValue();
                    if (operator.equals("Tf")) {
                        if (stack.size() >= 2) {
                            ret[DA_FONT] = stack.get(stack.size() - 2);
                            ret[DA_SIZE] = new Float((String)stack.get(stack.size() - 1));
                        }
                    }
                    else if (operator.equals("g")) {
                        if (stack.size() >= 1) {
                            float gray = new Float((String)stack.get(stack.size() - 1)).floatValue();
                            if (gray != 0)
                                ret[DA_COLOR] = new GrayColor(gray);
                        }
                    }
                    else if (operator.equals("rg")) {
                        if (stack.size() >= 3) {
                            float red = new Float((String)stack.get(stack.size() - 3)).floatValue();
                            float green = new Float((String)stack.get(stack.size() - 2)).floatValue();
                            float blue = new Float((String)stack.get(stack.size() - 1)).floatValue();
                            ret[DA_COLOR] = new Color(red, green, blue);
                        }
                    }
                    else if (operator.equals("k")) {
                        if (stack.size() >= 4) {
                            float cyan = new Float((String)stack.get(stack.size() - 4)).floatValue();
                            float magenta = new Float((String)stack.get(stack.size() - 3)).floatValue();
                            float yellow = new Float((String)stack.get(stack.size() - 2)).floatValue();
                            float black = new Float((String)stack.get(stack.size() - 1)).floatValue();
                            ret[DA_COLOR] = new CMYKColor(cyan, magenta, yellow, black);
                        }
                    }
                    stack.clear();
                }
                else
                    stack.add(tk.getStringValue());
            }
            return ret;
        }
        catch (IOException ioe) {
            throw new ExceptionConverter(ioe);
        }
    }
    
    public void decodeGenericDictionary(PdfDictionary merged, BaseField tx) throws IOException, DocumentException {
        int flags = 0;
        // the text size and color
        PdfString da = (PdfString)PdfReader.getPdfObject(merged.get(PdfName.DA));
        if (da != null) {
            Object dab[] = splitDAelements(da.toUnicodeString());
            if (dab[DA_SIZE] != null)
                tx.setFontSize(((Float)dab[DA_SIZE]).floatValue());
            if (dab[DA_COLOR] != null)
                tx.setTextColor((Color)dab[DA_COLOR]);
            if (dab[DA_FONT] != null) {
                PdfDictionary font = (PdfDictionary)PdfReader.getPdfObject(merged.get(PdfName.DR));
                if (font != null) {
                    font = (PdfDictionary)PdfReader.getPdfObject(font.get(PdfName.FONT));
                    if (font != null) {
                        PdfObject po = font.get(new PdfName((String)dab[DA_FONT]));
                        if (po != null && po.type() == PdfObject.INDIRECT) {
                            PRIndirectReference por = (PRIndirectReference)po;
                            BaseFont bp = new DocumentFont((PRIndirectReference)po);
                            tx.setFont(bp);
                            Integer porkey = new Integer(por.getNumber());
                            BaseFont porf = (BaseFont)extensionFonts.get(porkey);
                            if (porf == null) {
                                if (!extensionFonts.containsKey(porkey)) {
                                    PdfDictionary fo = (PdfDictionary)PdfReader.getPdfObject(po);
                                    PdfDictionary fd = (PdfDictionary)PdfReader.getPdfObject(fo.get(PdfName.FONTDESCRIPTOR));
                                    if (fd != null) {
                                        PRStream prs = (PRStream)PdfReader.getPdfObject(fd.get(PdfName.FONTFILE2));
                                        if (prs == null)
                                            prs = (PRStream)PdfReader.getPdfObject(fd.get(PdfName.FONTFILE3));
                                        if (prs == null) {
                                            extensionFonts.put(porkey, null);
                                        }
                                        else {
                                            try {
                                                porf = BaseFont.createFont("font.ttf", BaseFont.IDENTITY_H, true, false, PdfReader.getStreamBytes(prs), null);
                                            }
                                            catch (Exception e) {
                                            }
                                            extensionFonts.put(porkey, porf);
                                        }
                                    }
                                }
                            }
                            if (tx instanceof TextField)
                                ((TextField)tx).setExtensionFont(porf);
                        }
                        else {
                            BaseFont bf = (BaseFont)localFonts.get(dab[DA_FONT]);
                            if (bf == null) {
                                String fn[] = (String[])stdFieldFontNames.get(dab[DA_FONT]);