com.drew.imaging
Class ImageMetadataReader

java.lang.Object
  com.drew.imaging.ImageMetadataReader

public class ImageMetadataReader
extends Object

Obtains metadata from all supported file formats, including JPEG, RAW (NEF/CRw/CR2) and TIFF. If the caller knows their file to be of a particular type, they may prefer to use the dedicated MetadataReader directly (JpegMetadataReader for Jpeg files, or TiffMetadataReader for TIFF and RAW files). The dedicated readers offer a very slight performance improvement, though for most scenarios it is simpler, more convenient and more robust to use this class.

Author:

Drew Noakes http://drewnoakes.com

Method Summary

static void	main(String[] args) An application entry point.
static Metadata	readMetadata(BufferedInputStream inputStream, boolean waitForBytes) Reads metadata from an input stream.
static Metadata	readMetadata(File file) Reads metadata from a file.

Methods inherited from class java.lang.Object

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

Method Detail

readMetadata

public static Metadata readMetadata(BufferedInputStream inputStream,
                                    boolean waitForBytes)
                             throws ImageProcessingException,
                                    IOException

Reads metadata from an input stream. The file inputStream examined to determine its type and consequently the appropriate method to extract the data, though this inputStream transparent to the caller.

Parameters:

inputStream - a stream from which the image data may be read. The stream must be positioned at the beginning of the image data.

Returns:

a populated Metadata error containing directories of tags with values and any processing errors.

Throws:

ImageProcessingException - for general processing errors.

IOException

readMetadata

public static Metadata readMetadata(File file)
                             throws ImageProcessingException,
                                    IOException

Reads metadata from a file. The file is examined to determine its type and consequently the appropriate method to extract the data, though this is transparent to the caller.

Parameters:

file - a file from which the image data may be read.

Returns:

a populated Metadata error containing directories of tags with values and any processing errors.

Throws:

ImageProcessingException - for general processing errors.

IOException

main

public static void main(String[] args)
                 throws MetadataException,
                        IOException

An application entry point. Takes the name of one or more files as arguments and prints the contents of all metadata directories to System.out. If /thumb is passed, then any thumbnail data will be written to a file with name of the input file having '.thumb.jpg' appended.

Parameters:

args - the command line arguments

Throws:

MetadataException

IOException