Package com.drew.metadata.jfif

Class JfifReader

java.lang.Object

com.drew.metadata.jfif.JfifReader

All Implemented Interfaces:

JpegSegmentMetadataReader, MetadataReader

public class JfifReader
extends Object
implements JpegSegmentMetadataReader, MetadataReader

Reader for JFIF data, found in the APP0 JPEG segment.

• http://en.wikipedia.org/wiki/JPEG_File_Interchange_Format
• http://www.w3.org/Graphics/JPEG/jfif3.pdf

Author:

Yuri Binev, Drew Noakes, Markus Meyer

Field Summary

Fields

Modifier and Type	Field	Description
static final String	PREAMBLE

Constructor Summary

Constructors

Constructor	Description
JfifReader()

Method Summary

Modifier and Type	Method	Description
void	extract(RandomAccessReader reader, Metadata metadata)	Performs the Jfif data extraction, adding found values to the specified instance of Metadata.
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 Details

PREAMBLE

public static final String PREAMBLE

See Also:

• Constant Field Values

Constructor Details

JfifReader

public JfifReader()

Method Details

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)

Performs the Jfif data extraction, adding found values to the specified instance of Metadata.

Specified by:

extract in interface MetadataReader

Parameters:

reader - The RandomAccessReader from which the metadata should be extracted.

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