public final void applyPattern()

in src/main/java/org/apache/commons/text/ExtendedMessageFormat.java [213:281]
65 lines of code
14 McCabe index (conditional complexity)

    public final void applyPattern(final String pattern) {
        if (registry == null) {
            super.applyPattern(pattern);
            toPattern = super.toPattern();
            return;
        }
        final ArrayList<Format> foundFormats = new ArrayList<>();
        final ArrayList<String> foundDescriptions = new ArrayList<>();
        final StringBuilder stripCustom = new StringBuilder(pattern.length());

        final ParsePosition pos = new ParsePosition(0);
        final char[] c = pattern.toCharArray();
        int fmtCount = 0;
        while (pos.getIndex() < pattern.length()) {
            switch (c[pos.getIndex()]) {
            case QUOTE:
                appendQuotedString(pattern, pos, stripCustom);
                break;
            case START_FE:
                fmtCount++;
                seekNonWs(pattern, pos);
                final int start = pos.getIndex();
                final int index = readArgumentIndex(pattern, next(pos));
                stripCustom.append(START_FE).append(index);
                seekNonWs(pattern, pos);
                Format format = null;
                String formatDescription = null;
                if (c[pos.getIndex()] == START_FMT) {
                    formatDescription = parseFormatDescription(pattern,
                            next(pos));
                    format = getFormat(formatDescription);
                    if (format == null) {
                        stripCustom.append(START_FMT).append(formatDescription);
                    }
                }
                foundFormats.add(format);
                foundDescriptions.add(format == null ? null : formatDescription);
                if (foundFormats.size() != fmtCount) {
                    throw new IllegalArgumentException("The validated expression is false");
                }
                if (foundDescriptions.size() != fmtCount) {
                    throw new IllegalArgumentException("The validated expression is false");
                }
                if (c[pos.getIndex()] != END_FE) {
                    throw new IllegalArgumentException(
                            "Unreadable format element at position " + start);
                }
                //$FALL-THROUGH$
            default:
                stripCustom.append(c[pos.getIndex()]);
                next(pos);
            }
        }
        super.applyPattern(stripCustom.toString());
        toPattern = insertFormats(super.toPattern(), foundDescriptions);
        if (containsElements(foundFormats)) {
            final Format[] origFormats = getFormats();
            // only loop over what we know we have, as MessageFormat on Java 1.3
            // seems to provide an extra format element:
            int i = 0;
            for (final Format f : foundFormats) {
                if (f != null) {
                    origFormats[i] = f;
                }
                i++;
            }
            super.setFormats(origFormats);
        }
    }