}
  }

  @Override
  public Writer append(char c) throws IOException {
    checkNotClosed();
    target.append(c);
    return this;
  }

  @Override
  public Writer append(@Nullable CharSequence charSeq) throws IOException {
    checkNotClosed();
    target.append(charSeq);
    return this;
  }

  @Override

            if (values == null) {
                // nothing
            } else if (values.length == 1) {
                queryBuf.append(' ').append(key).append(":\"").append(values[0]).append('\"');
            } else if (values.length > 1) {
                boolean first = true;
                queryBuf.append(" (");
                for (final String value : values) {
                    if (first) {
                        first = false;

    }

    // Test multiple appends to the same buffer
    public void test_multipleAppends() {
        StringBuilder buf = new StringBuilder();

        monitorTarget.append(buf, "key1", () -> "value1");
        buf.append(",");
        monitorTarget.append(buf, "key2", () -> 123);
        buf.append(",");
        monitorTarget.append(buf, "key3", () -> null);

        buf.append("-Xlog:gc*,gc+age=trace,safepoint:file=");
        if (logFilePath != null) {
            buf.append(logFilePath);
        } else {
            buf.append(ComponentUtil.getSystemHelper().getLogFilePath());
        }
        buf.append(File.separator);
        buf.append("gc-").append(getExecuteType()).append(".log");
        buf.append(":utctime,pid,tags:filecount=5,filesize=64m");

            buf.append(',');
            buf.append("\"page_number\":");
            buf.append(currentPageNumber);
            buf.append(',');
            buf.append("\"record_count\":");
            buf.append(allRecordCount);
            buf.append(',');
            buf.append("\"record_count_relation\":");
            buf.append(escapeJson(allRecordCountRelation));
            buf.append(',');
            buf.append("\"page_count\":");

        json.append("{");
        json.append("\"timestamp\":\"").append(escapeJson(entry.timestamp.toString())).append("\",");
        json.append("\"eventType\":\"").append(entry.eventType.name()).append("\",");
        json.append("\"severity\":\"").append(entry.severity.name()).append("\",");
        json.append("\"message\":\"").append(escapeJson(entry.message)).append("\"");

        if (!entry.context.isEmpty()) {

        buf.append(',').append('"').append(FieldNames.FIELDS).append("\":").append(convertJsonStrings(fields));
        buf.append(',').append('"').append(FieldNames.TAGS).append("\":").append(convertJsonStrings(tags));
        buf.append(',').append('"').append(FieldNames.ROLES).append("\":").append(convertJsonStrings(roles));
        buf.append(',').append('"').append(FieldNames.LANGUAGES).append("\":").append(convertJsonStrings(languages));
        buf.append(',')

        buf.append(File.separator);
        buf.append(getExecuteType());
        buf.append(File.separator);
        buf.append("resources");
        buf.append(cpSeparator);
        // WEB-INF/classes
        buf.append("WEB-INF");
        buf.append(File.separator);
        buf.append("classes");
        // target/classes
        final String userDir = System.getProperty("user.dir");

            buf.append('"').append(StringEscapeUtils.escapeJson(format)).append('"');
        } else if (value instanceof String[]) {
            final String json = Arrays.stream((String[]) value)
                    .map(s -> "\"" + StringEscapeUtils.escapeJson(s) + "\"")
                    .collect(Collectors.joining(","));
            buf.append('[').append(json).append(']');
        } else if (value instanceof List) {

            final StringBuilder b = new StringBuilder();
            b.append('"').append(StringEscapeUtils.escapeJson(p.getName())).append("\":{");
            append(b, "count", () -> p.getCount()).append(',');
            append(b, "used", () -> p.getUsed().getBytes()).append(',');
            append(b, "capacity", () -> p.getTotalCapacity().getBytes()).append('}');
            return b.toString();