doc/data-api.fr.md
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# API d’accès aux métadonnées #
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ATTENTION !
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Cette documentation se réfère à la dernière version du Metadataplayer, disponible dans la branche **default** du repository
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http://www.iri.centrepompidou.fr/dev/hg/metadataplayer
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## Élément de base ##
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    IriSP.Model.Element
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### Rôle ###
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Classe de base dont héritent les différents types d’objets utilisés dans le Metadataplayer: annotations, types d’annotations, médias, etc.
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### Instanciation ###
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**Element** fonctionne comme une classe abstraite est n’est jamais instancié directement.
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Néanmoins, tous les objets en héritant seront instanciés de la manière suivante :
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    var myElement = new IriSP.Model.Element(id, source);
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- **id** est l’identifiant unique de l’élément. S’il est à *false*, un identifiant unique sera généré.
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- **source** identifie la source de données dont provient l’élément (cf. Source de Données, *IriSP.Model.Source*, plus bas).
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### Propriétés ###
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#### type ####
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Type d’élément, surchargé par les classes qui héritent de l’élément de base:
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- **element** pour IriSP.Model.Element
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- **media** pour IriSP.Model.Media
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- **annotationType** pour IriSP.Model.AnnotationType
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- **tag** pour IriSP.Model.Tag
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- **annotation** pour IriSP.Model.Annotation
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- **mashup** pour IriSP.Model.Mashup
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- **mashedAnnotation** pour IriSP.Model.MashedAnnotation
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#### id ####
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Identifiant unique de l’élément
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#### title ####
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Titre de l’élément, par défaut une chaîne vide ("")
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#### description ####
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Description de l’élément, par défaut une chaîne vide ("")
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## Media ##
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    IriSP.Model.Media
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### Rôle ###
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Représente un média (vidéo ou audio).
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Hérite de l’Élément de base
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### Propriétés ###
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#### video ####
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Il s’agit de l’URL de la vidéo à charger
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#### duration ####
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Il s’agit de la durée du média (telle que renseignée dans les métadonnées -- peut ne pas être égale à la durée telle que lue dans la fenêtre vidéo).
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Il s’agit d’un objet durée (cf. *IriSP.Model.Time* plus bas)
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### Méthodes ###
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#### getDuration ####
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Permet de spécifier la durée du média, en millisecondes
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#### getAnnotations ####
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Retourne la liste des annotations associées au média
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#### getAnnotationsByTypeTitle ####
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Retourne la liste des annotations associées au média et dont le type d’annotation (ou découpage, ou ligne, c.f. Type d’Annotation plus bas) correspond à l’argument de la fonction
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## Type d’Annotation ##
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    IriSP.Model.AnnotationType
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### Rôle ###
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Représente un type d’annotation, correspondant également à ce qui peut être nommé découpage ou ligne dans *Lignes de Temps*
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Hérite de l’Élément de base.
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### Méthodes ###
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#### getAnnotations ####
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Retourne la liste des annotations associées au type d’annotation
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## Annotation ##
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    IriSP.Model.Annotation
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### Rôle ###
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Représente une annotation, correspondant à un segment temporel (dont la durée peut être nulle) d’un média
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Hérite de l’Élément de base.
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### Propriétés ###
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#### begin ####
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Timecode de fin de l’annotation. Est un objet de type durée (cf. plus bas)
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#### begin ####
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Timecode de début de l’annotation. Est un objet de type durée (cf. plus bas)
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### Méthodes ###
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#### getMedia ####
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Retourne l’objet **Média** (*IriSP.Model.Media*) auquel se réfère l’annotation
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#### getAnnotationType ####
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Retourne l’objet **Type d’Annotation** (*IriSP.Model.AnnotationType*) auquel se réfère l’annotation
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#### getTags ####
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Retourne la liste (cf. Liste d’éléments *IriSP.Model.List*) des tags associés à l’annotation.
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#### getTagTexts ####
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## Mashup ##
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    IriSP.Model.Mashup
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### Rôle ###
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Il s’agit d’un bout à bout, composé d’une liste de segments (définis par des annotations de durée non nulle) accolés les uns après les autres.
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### Méthodes ###
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**À compléter**
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## Liste d’éléments ##
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    IriSP.Model.List
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### Rôle ###
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Etend les fonctionnalités des tableaux javascript (*Array*) pour lister des éléments (cf. types d’éléments ci-dessus).
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### Instanciation ###
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    var myList = new IriSP.Model.List(directory);
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- **directory** est le répertoire de données auxquelles la liste permet d’accéder (cf. plus bas)
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### Méthodes ###
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#### Méthodes de parcours de liste ####
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Ces méthodes sont fournies grâce à la bibliothèque extérieure *underscore.js* et sont documentées sur http://documentcloud.github.com/underscore/
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Il s’agit de:
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- **map**: Renvoie un tableau (*Array*) dont les éléments correspondent aux éléments de la liste, via une fonction passée en argument de map
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- **forEach**: Itère une fonction sur la liste.
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- **filter**: Ne renvoie que les éléments de la liste dont la valeur correspond au résultat d’une fonction.
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- **sortBy**: Fonction de tri, par ordre croissant de la valeur retournée par la fonction passée en argument.
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#### searchByTitle, searchByDescription, searchByTextFields ####
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Méthodes retournant une nouvelle liste d’éléments, contenant les éléments de la liste dont respectivement le titre, la description ou les deux correspondent à l’argument de la méthode.
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    myList.searchByTitle("texte"); // => un *IriSP.Model.List* contenant les éléments de myList dont le titre contient "texte"
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## Durée ##
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    IriSP.Model.Time
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### Rôle ###
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Facilite la gestion des durées en millisecondes utilisées dans le Metadataplayer
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### Instanciation ###
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    var myTime = new IriSP.Model.Time(ms);
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- **ms** est une durée en millisecondes
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### Méthodes ###
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#### getSeconds ####
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Renvoie la durée convertie en secondes
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#### toString ####
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Renvoie la durée au format (hh:)mm:ss
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#### setSeconds ####
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Permet d’affecter une durée en secondes
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    myTime.setSeconds(12); // 12000 millisecondes
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## Source de données ##
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    IriSP.Model.Source
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    IriSP.Model.RemoteSource
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### Rôle ###
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Gère une source de données : fichier externe JSON, XML, etc. pour *IriSP.Model.RemoteSource*, projet créé à la volée pour *IriSP.Model.Source*.
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*IriSP.Model.RemoteSource* hérite de *IriSP.Model.Source* et ne diffère que par son implémentation de la méthode *get*.
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Sur la plateforme *Lignes de Temps*, il existe plusieurs API qui sont utilisées comme sources :
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- L’API projet, qui renvoie un fichier JSON contenant un projet LDT complet.
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- L’API segment, qui renvoie toutes les annotations d’un média situées entre deux timecodes fournis en argument.
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- L’API de publication d’annotation, qui demande l’envoi (par la méthode HTTP PUT) d’une liste d’annotation et renvoie celle-ci en retour, avec les identifiants des annotations en base de données.
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### Instanciation ###
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    var config = { directory: myDirectory };
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    var mySource = new IriSP.Model.Source(config);
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- **config** est un objet contenant les options de configuration:
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    - Il doit nécessairement contenir une propriété **directory**, désignant le répertoire de données (cf. plus bas).
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    - La propriété **serializer** doit désigner le *Sérialiseur* utilisé pour désérialiser les données importées ou sérialiser l’export.
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    - un *IriSP.Model.RemoteSource* doit également être appelé avec une propriété **url**, désignant l’URL de la source.
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Une Source ne doit pas être instanciée directement, ce rôle est donné aux répertoires de données, ce qui permet notamment d’éviter des accès multiples à une même URL.
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### Propriétés ###
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#### currentMedia ####
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*TODO: transférer dans un objet "Project"*
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Donne accès au média en cours du projet. Peut désigner un vrai média ou un mashup.
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### Méthodes ###
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#### get ####
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Permet de récupérer ou de rafraîchir, via Ajax, les données de la source. Pour un *IriSP.Model.Source* de base, n’a aucun effet.
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#### onLoad ####
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Permet d’exécuter une fonction, passée en argument, au chargement de la source.
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#### serialize, deSerialize ####
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Transforme les données de la source en données sérialisées, au format du sérialiseur associées à la source, et inversement.
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#### getAnnotations, getAnnotationTypes, getMedias, getTags, getMashups ####
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Retourne les listes respectives d’annotations, types d’annotations, médias, tags et mashups de la source.
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#### getAnnotationsByTypeTitle ####
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Retourne la liste des annotations dont le type d’annotation correspond à l’argument de la fonction.
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## Répertoire de données ##
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    IriSP.Model.Directory
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### Rôle ###
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Gère l’instanciation des sources de données et la mise en cache de ces sources lorsque plusieurs appels à la même URLs sont faits.
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Permet également aux objets de plusieurs sources d’interagir entre eux.
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### Instanciation ###
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    var myDirectory = new IriSP.Model.Directory
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### Méthodes ###
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#### newLocalSource ####
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Crée une nouvelle source non attachée à une URL. S’il faut exporter des données, un sérialiseur doit être passé en paramètres.
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    var myConfig = { serializer: IriSP.serializers.ldt };
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    var myLocalSource = myDirectory.newLocalSource(myConfig);
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#### remoteSource ####
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Crée ou récupère (si celle-ci existe déjà) une source attachée à une URL. Le sérialiseur est obligatoire.
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    var myConfig = { url: "source-data.json", serializer: IriSP.serializers.ldt };
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    var myLocalSource = myDirectory.remoteSource(myConfig);