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Add documentation
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@ -55,7 +55,34 @@ import org.jivesoftware.smackx.pubsub.PubSubManager;
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import org.jxmpp.jid.EntityBareJid;
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/**
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* User Avatar manager class.
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* <h1>User Avatar manager class.</h1>
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* This manager allows publication of user avatar images via PubSub, as well as publication of
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* {@link MetadataExtension MetadataExtensions} containing {@link MetadataInfo} elements for avatars
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* available via PubSub, HTTP or external third-party services via {@link MetadataPointer} elements.
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* <p>
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* The easiest way to publish a PNG avatar (support for PNG files is REQUIRED), is to use
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* {@link #publishPNGAvatar(File, int, int)} which will publish the image data to PubSub and inform
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* any subscribers via a metadata update.
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* <p>
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* Publishing avatars via HTTP is not in the scope of this manager (you could use Smacks
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* HTTPFileUploadManager from smack-experimental for that), but publishing metadata updates pointing
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* to HTTP resources is supported. Use {@link #publishHttpPNGAvatarMetadata(String, URL, long, int, int)} for that.
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* <p>
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* By calling {@link #enable()}, the {@link UserAvatarManager} will start receiving metadata updates from
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* contacts and other entities. If you want to get informed about those updates, you can register listeners
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* by calling {@link #addAvatarListener(AvatarListener)}.
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* <p>
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* If you store avatars locally, it is recommended to also set an {@link AvatarMetadataStore}, which is responsible
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* for keeping track of which avatar files are locally available. If you register such a store via
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* {@link #setAvatarMetadataStore(AvatarMetadataStore)}, your registered {@link AvatarListener AvatarListeners}
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* will only inform you about those avatars that are not yet locally available.
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* <p>
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* To fetch an avatar from PubSub, use {@link #fetchAvatarFromPubSub(EntityBareJid, MetadataInfo)} which will
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* retrieve the avatar data from PubSub and mark the avatar as locally available in the {@link AvatarMetadataStore}
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* if one is registered.
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* <p>
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* Fetching avatars published via HTTP is out of scope of this manager. If you do implement it, remember to mark the
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* avatar as locally available in your {@link AvatarMetadataStore} after you retrieved it.
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*
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* @author Fernando Ramirez
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* @author Paul Schaub
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