*
   * <p>Unlike {@link Double#parseDouble(String)}, this method returns {@code null} instead of
   * throwing an exception if parsing fails. Valid inputs are exactly those accepted by {@link
   * Double#valueOf(String)}, except that leading and trailing whitespace is not permitted.
   *
   * <p>This implementation is likely to be faster than {@code Double.parseDouble} if many failures
   * are expected.
   *

        assertEquals(Float.parseFloat(expected), DocumentUtil.getValue(doc, "key1", Float.class).floatValue());
        assertEquals(Double.parseDouble(expected), DocumentUtil.getValue(doc, "key1", Double.class).doubleValue());

        assertNull(DocumentUtil.getValue(doc, "key2", String.class));
    }

    public void test_strings() {

                            } else if (Constants.MAPPING_TYPE_DOUBLE.equalsIgnoreCase(mapping.getValue2())) {
                                dataMap.put(mapping.getValue1(), Double.parseDouble(values[0]));
                            } else if (Constants.MAPPING_TYPE_DATE.equalsIgnoreCase(mapping.getValue2())
                                    || Constants.MAPPING_TYPE_PDF_DATE.equalsIgnoreCase(mapping.getValue2())) {