Replacing a text in Apache POI XWPF

ReplacingTtextInApachePOIXWPF.java

    iterateThroughParagraphs(doc, fieldsForReport);
    iterateThroughFooters(doc, fieldsForReport);
    iterateThroughTables(doc, fieldsForReport);

    private void iterateThroughParagraphs(XWPFDocument doc, Map<String, String> fieldsForReport) throws NotFoundException {
        for (XWPFParagraph paragraph : doc.getParagraphs()) {
            iterateThroughRuns(paragraph, fieldsForReport);
        }
    }

    private void iterateThroughTables(XWPFDocument doc, Map<String, String> fieldsForReport) throws NotFoundException {
        for (XWPFTable tbl : doc.getTables()) {
            for (XWPFTableRow row : tbl.getRows()) {
                for (XWPFTableCell cell : row.getTableCells()) {
                    for (XWPFParagraph paragraph : cell.getParagraphs()) {
                        iterateThroughRuns(paragraph, fieldsForReport);
                    }
                }
            }
        }
    }

    private void iterateThroughFooters(XWPFDocument doc, Map<String, String> fieldsForReport) throws NotFoundException {
        for (XWPFFooter footer : doc.getFooterList()) {
            for (XWPFParagraph paragraph : footer.getParagraphs()) {
                iterateThroughRuns(paragraph, fieldsForReport);
            }
        }
    }

    private void iterateThroughRuns(XWPFParagraph paragraph, Map<String, String> fieldsForReport) throws NotFoundException {
        List<XWPFRun> runs = paragraph.getRuns();

        if (runs != null) {
            int runsSize = runs.size();

            for (int index = 0; index < runsSize; index++) {
                XWPFRun currentRun = runs.get(index);
                String text = currentRun.getText(0);

                if (text != null && text.contains("#")) {
                    if (text.matches("(?i).*#[a-zA-Z0-9]+#.*")) {
                        Matcher m = Pattern.compile("#[a-zA-Z0-9]+#")
                                .matcher(text);

                        while (m.find()) {
                            String variableWithHash = m.group();
                            String variableWithoutHash = variableWithHash.replace("#", "");

                            if (fieldsForReport.get(variableWithoutHash) == null) {
                                continue;
                            }

                            String newText = currentRun.getText(0).replace(variableWithHash, fieldsForReport.get(variableWithoutHash));
                            currentRun.setText(newText, 0);
                        }
                        continue;
                    }

                    if (("#".equals(text) || " #".equals(text)) && index + 1 < runsSize) {
                        replaceVariableBetweenDifferentRuns(index, runs, fieldsForReport);
                        index += 2;
                    }
                }
            }
        }
    }
    
    private void replaceVariableBetweenDifferentRuns(int index, List<XWPFRun> runs, Map<String, String> fieldsForReport) throws NotFoundException {
        XWPFRun currentRun = runs.get(index);
        String text = currentRun.getText(0);

        XWPFRun middleRun = runs.get(index + 1);
        String middleText = middleRun.getText(0);

        String newVariableValue = fieldsForReport.get(middleText);

        if (newVariableValue == null) {
            throw new NotFoundException("Variable: " + middleText + " is not presented in the data from DB during report prepared.");
        }

        XWPFRun lastRun = runs.get(index + 2);
        String lastText = lastRun.getText(0);

        if (middleText.matches("[a-zA-Z0-9]+") && "#".equals(lastText)) {
            currentRun.setText(text.replace("#", ""), 0);
            middleRun.setText(newVariableValue, 0);
            lastRun.setText("", 0);
        } else {
            throw new NotFoundException("Problems were occurred during variable replacement");
        }
    }