com.drew.metadata

Class TagDescriptor

Implemented Interfaces:
Serializable
Known Direct Subclasses:
CanonMakernoteDescriptor, CasioType1MakernoteDescriptor, CasioType2MakernoteDescriptor, DefaultTagDescriptor, ExifDescriptor, ExifInteropDescriptor, FujifilmMakernoteDescriptor, GpsDescriptor, IptcDescriptor, JpegCommentDescriptor, JpegDescriptor, KodakMakernoteDescriptor, KyoceraMakernoteDescriptor, NikonType1MakernoteDescriptor, NikonType2MakernoteDescriptor, OlympusMakernoteDescriptor, PanasonicMakernoteDescriptor, PentaxMakernoteDescriptor, SonyMakernoteDescriptor

public abstract class TagDescriptor
extends java.lang.Object
implements Serializable

Abstract base class for all tag descriptor classes. Implementations are responsible for providing the human-readable string represenation of tag values stored in a directory. The directory is provided to the tag descriptor via its constructor.

Field Summary

protected Directory
_directory

Constructor Summary

TagDescriptor(Directory directory)

Method Summary

abstract String
getDescription(int tagType)
Returns a descriptive value of the the specified tag for this image.

Field Details

_directory

protected final Directory _directory

Constructor Details

TagDescriptor

public TagDescriptor(Directory directory)

Method Details

getDescription

public abstract String getDescription(int tagType)
            throws MetadataException
Returns a descriptive value of the the specified tag for this image. Where possible, known values will be substituted here in place of the raw tokens actually kept in the Exif segment. If no substitution is available, the value provided by getString(int) will be returned.

This and getString(int) are the only 'get' methods that won't throw an exception.

Parameters:
tagType - the tag to find a description for
Returns:
a description of the image's value for the specified tag, or null if the tag hasn't been defined.

Copyright © 2006 Drew Noakes. All Rights Reserved.