com.drew.metadata.exif

Class ExifReader

java.lang.Object

com.drew.metadata.exif.ExifReader

All Implemented Interfaces:

JpegSegmentMetadataReader

public class ExifReader
extends Object
implements JpegSegmentMetadataReader

Decodes Exif binary data, populating a Metadata object with tag values in ExifSubIFDDirectory, ExifThumbnailDirectory, ExifInteropDirectory, GpsDirectory and one of the many camera makernote directories.

Field Summary

Fields

Modifier and Type	Field and Description
static String	JPEG_SEGMENT_PREAMBLE Exif data stored in JPEG files' APP1 segment are preceded by this six character preamble.

Constructor Summary

Constructors

Constructor and Description
ExifReader()

Method Summary

Modifier and Type	Method and Description
void	extract(RandomAccessReader reader, Metadata metadata) Reads TIFF formatted Exif data from start of the specified RandomAccessReader.
void	extract(RandomAccessReader reader, Metadata metadata, int readerOffset) Reads TIFF formatted Exif data a specified offset within a RandomAccessReader.
void	extract(RandomAccessReader reader, Metadata metadata, int readerOffset, Directory parentDirectory) Reads TIFF formatted Exif data at a specified offset within a RandomAccessReader.
Iterable<JpegSegmentType>	getSegmentTypes() Gets the set of JPEG segment types that this reader is interested in.
void	readJpegSegments(Iterable<byte[]> segments, Metadata metadata, JpegSegmentType segmentType) Extracts metadata from all instances of a particular JPEG segment type.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

JPEG_SEGMENT_PREAMBLE

public static final String JPEG_SEGMENT_PREAMBLE

Exif data stored in JPEG files' APP1 segment are preceded by this six character preamble.

See Also:

Constant Field Values

Constructor Detail

ExifReader

public ExifReader()

Method Detail

getSegmentTypes

public Iterable<JpegSegmentType> getSegmentTypes()

Description copied from interface: JpegSegmentMetadataReader

Gets the set of JPEG segment types that this reader is interested in.

Specified by:

getSegmentTypes in interface JpegSegmentMetadataReader

readJpegSegments

public void readJpegSegments(Iterable<byte[]> segments,
                             Metadata metadata,
                             JpegSegmentType segmentType)

Description copied from interface: JpegSegmentMetadataReader

Extracts metadata from all instances of a particular JPEG segment type.

Specified by:

readJpegSegments in interface JpegSegmentMetadataReader

Parameters:

segments - A sequence of byte arrays from which the metadata should be extracted. These are in the order encountered in the original file.

metadata - The Metadata object into which extracted values should be merged.

segmentType - The JpegSegmentType being read.

extract

public void extract(RandomAccessReader reader,
                    Metadata metadata)

Reads TIFF formatted Exif data from start of the specified RandomAccessReader.

extract

public void extract(RandomAccessReader reader,
                    Metadata metadata,
                    int readerOffset)

Reads TIFF formatted Exif data a specified offset within a RandomAccessReader.

extract

public void extract(RandomAccessReader reader,
                    Metadata metadata,
                    int readerOffset,
                    Directory parentDirectory)

Reads TIFF formatted Exif data at a specified offset within a RandomAccessReader.