com.drew.metadata
Class TagDescriptor

java.lang.Object
  com.drew.metadata.TagDescriptor

All Implemented Interfaces:

Serializable

Direct Known 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 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.

See Also:

Serialized Form

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.

Methods inherited from class java.lang.Object

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

Field Detail

_directory

protected final Directory _directory

Constructor Detail

TagDescriptor

public TagDescriptor(Directory directory)

Method Detail

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.

Throws:

MetadataException