Example usage for org.apache.commons.imaging.formats.tiff.constants GpsTagConstants GPS_TAG_GPS_AREA_INFORMATION

Introduction

In this page you can find the example usage for org.apache.commons.imaging.formats.tiff.constants GpsTagConstants GPS_TAG_GPS_AREA_INFORMATION.

Prototype

TagInfoGpsText GPS_TAG_GPS_AREA_INFORMATION

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Usage

From source file:net.tourbook.photo.Photo.java

/**
 * GPS area info/*from  w w  w. j  a v  a2s  .co m*/
 */
private String getExifValueGpsArea(final JpegImageMetadata jpegMetadata) {

    try {
        final TiffField field = jpegMetadata
                .findEXIFValueWithExactMatch(GpsTagConstants.GPS_TAG_GPS_AREA_INFORMATION);
        if (field != null) {
            final Object fieldValue = field.getValue();
            if (fieldValue != null) {

                /**
                 * source: Exif 2.2 specification
                 * 
                 * <pre>
                 * 
                 * Table 6 Character Codes and their Designation
                 * 
                 * Character Code   Code Designation (8 Bytes)                   References
                 * ASCII           41.H, 53.H, 43.H, 49.H, 49.H, 00.H, 00.H, 00.H  ITU-T T.50 IA5
                 * JIS            A.H, 49.H, 53.H, 00.H, 00.H, 00.H, 00.H, 00.H   JIS X208-1990
                 * Unicode         55.H, 4E.H, 49.H, 43.H, 4F.H, 44.H, 45.H, 00.H  Unicode Standard
                 * Undefined      00.H, 00.H, 00.H, 00.H, 00.H, 00.H, 00.H, 00.H  Undefined
                 * 
                 * </pre>
                 */
                final byte[] byteArrayValue = field.getByteArrayValue();
                final int fieldLength = byteArrayValue.length;

                if (fieldLength > 0) {

                    /**
                     * <pre>
                     * 
                     * skipping 1 + 6 characters:
                     * 
                     * 1      character code
                     * 2...7  have no idea why these bytes are set to none valid characters
                     * 
                     * </pre>
                     */
                    final byte[] valueBytes = Arrays.copyOfRange(byteArrayValue, 7, fieldLength);

                    String valueString = null;

                    final byte firstByte = byteArrayValue[0];
                    if (firstByte == 0x55) {

                        valueString = new String(valueBytes, UI.UTF_16);

                    } else {

                        valueString = new String(valueBytes);
                    }

                    return valueString;
                }
            }
        }
    } catch (final Exception e) {
        // ignore
    }

    return null;
}

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