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Entity.js
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Entity.js
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// VIE - Vienna IKS Editables
// (c) 2011 Henri Bergius, IKS Consortium
// (c) 2011 Sebastian Germesin, IKS Consortium
// (c) 2011 Szaby Grünwald, IKS Consortium
// VIE may be freely distributed under the MIT license.
// For all details and documentation:
// http://viejs.org/
// ## VIE Entities
//
// In VIE there are two low-level model types for storing data.
// **Collections** and **Entities**. Considering `var v = new VIE();` a VIE instance,
// `v.entities` is a Collection with `VIE Entity` objects in it.
// VIE internally uses JSON-LD to store entities.
//
// Each Entity has a few special attributes starting with an `@`. VIE has an API
// for correctly using these attributes, so in order to stay compatible with later
// versions of the library, possibly using a later version of JSON-LD, use the API
// to interact with your entities.
//
// * `@subject` stands for the identifier of the entity. Use `e.getSubject()`
// * `@type` stores the explicit entity types. VIE internally handles Type hierarchy,
// which basically enables to define subtypes and supertypes. Every entity has
// the type 'owl:Thing'. Read more about Types in <a href="Type.html">VIE.Type</a>.
// * `@context` stores namespace definitions used in the entity. Read more about
// Namespaces in <a href="Namespace.html">VIE Namespaces</a>.
VIE.prototype.Entity = function(attrs, opts) {
attrs = (attrs)? attrs : {};
opts = (opts)? opts : {};
var self = this;
if (attrs['@type'] !== undefined) {
attrs['@type'] = (_.isArray(attrs['@type']))? attrs['@type'] : [ attrs['@type'] ];
attrs['@type'] = _.map(attrs['@type'], function(val){
if (!self.vie.types.get(val)) {
//if there is no such type -> add it and let it inherit from "owl:Thing"
self.vie.types.add(val).inherit("owl:Thing");
}
return self.vie.types.get(val).id;
});
attrs['@type'] = (attrs['@type'].length === 1)? attrs['@type'][0] : attrs['@type'];
} else {
// provide "owl:Thing" as the default type if none was given
attrs['@type'] = self.vie.types.get("owl:Thing").id;
}
//the following provides full seamless namespace support
//for attributes. It should not matter, if you
//query for `model.get('name')` or `model.get('foaf:name')`
//or even `model.get('http://xmlns.com/foaf/0.1/name');`
//However, if we just overwrite `set()` and `get()`, this
//raises a lot of side effects, so we need to expand
//the attributes before we create the model.
_.each (attrs, function (value, key) {
var newKey = VIE.Util.mapAttributeNS(key, this.namespaces);
if (key !== newKey) {
delete attrs[key];
attrs[newKey] = value;
}
}, self.vie);
var Model = Backbone.Model.extend({
idAttribute: '@subject',
initialize: function(attributes, options) {
if (attributes['@subject']) {
this.id = this['@subject'] = this.toReference(attributes['@subject']);
} else {
this.id = this['@subject'] = attributes['@subject'] = this.cid.replace('c', '_:bnode');
}
return this;
},
schema: function() {
return VIE.Util.getFormSchema(this);
},
// ### Getter, Has, Setter
// #### `.get(attr)`
// To be able to communicate to a VIE Entity you can use a simple get(property)
// command as in `entity.get('rdfs:label')` which will give you one or more literals.
// If the property points to a collection, its entities can be browsed further.
get: function (attr) {
attr = VIE.Util.mapAttributeNS(attr, self.vie.namespaces);
var value = Backbone.Model.prototype.get.call(this, attr);
value = (_.isArray(value))? value : [ value ];
value = _.map(value, function(v) {
if (v !== undefined && attr === '@type' && self.vie.types.get(v)) {
return self.vie.types.get(v);
} else if (v !== undefined && self.vie.entities.get(v)) {
return self.vie.entities.get(v);
} else {
return v;
}
}, this);
if(value.length === 0) {
return undefined;
}
// if there is only one element, just return that one
value = (value.length === 1)? value[0] : value;
return value;
},
// #### `.has(attr)`
// Sometimes you'd like to determine if a specific attribute is set
// in an entity. For this reason you can call for example `person.has('friend')`
// to determine if a person entity has friends.
has: function(attr) {
attr = VIE.Util.mapAttributeNS(attr, self.vie.namespaces);
return Backbone.Model.prototype.has.call(this, attr);
},
// #### `.set(attrName, value, opts)`,
// The `options` parameter always refers to a `Backbone.Model.set` `options` object.
//
// **`.set(attributes, options)`** is the most universal way of calling the
// `.set` method. In this case the `attributes` object is a map of all
// attributes to be changed.
set : function(attrs, options, opts) {
if (!attrs) {
return this;
}
if (attrs['@subject']) {
attrs['@subject'] = this.toReference(attrs['@subject']);
}
// Use **`.set(attrName, value, options)`** for setting or changing exactly one
// entity attribute.
if (typeof attrs === "string") {
var obj = {};
obj[attrs] = options;
return this.set(obj, opts);
}
// **`.set(entity)`**: In case you'd pass a VIE entity,
// the passed entities attributes are being set for the entity.
if (attrs.attributes) {
attrs = attrs.attributes;
}
var self = this;
var coll;
// resolve shortened URIs like rdfs:label..
_.each (attrs, function (value, key) {
var newKey = VIE.Util.mapAttributeNS(key, self.vie.namespaces);
if (key !== newKey) {
delete attrs[key];
attrs[newKey] = value;
}
}, this);
// Finally iterate through the *attributes* to be set and prepare
// them for the Backbone.Model.set method.
_.each (attrs, function (value, key) {
if (!value) { return; }
if (key.indexOf('@') === -1) {
if (value.isCollection) {
// ignore
value.each(function (child) {
self.vie.entities.addOrUpdate(child);
});
} else if (value.isEntity) {
self.vie.entities.addOrUpdate(value);
coll = new self.vie.Collection(value, {
vie: self.vie,
predicate: key
});
attrs[key] = coll;
} else if (_.isArray(value)) {
if (this.attributes[key] && this.attributes[key].isCollection) {
var newEntities = this.attributes[key].addOrUpdate(value);
attrs[key] = this.attributes[key];
attrs[key].reset(newEntities);
}
} else if (value["@value"]) {
// The value is a literal object, ignore
} else if (_.isObject(value) && !_.isDate(value)) {
// The value is another VIE Entity
var child = new self.vie.Entity(value, options);
// which is being stored in `v.entities`
self.vie.entities.addOrUpdate(child);
// and set as VIE Collection attribute on the original entity
coll = new self.vie.Collection(value, {
vie: self.vie,
predicate: key
});
attrs[key] = coll;
} else {
// ignore
}
}
}, this);
return Backbone.Model.prototype.set.call(this, attrs, options);
},
// **`.unset(attr, opts)` ** removes an attribute from the entity.
unset: function (attr, opts) {
attr = VIE.Util.mapAttributeNS(attr, self.vie.namespaces);
return Backbone.Model.prototype.unset.call(this, attr, opts);
},
// Validation based on type rules.
//
// There are two ways to skip validation for entity operations:
//
// * `options.silent = true`
// * `options.validate = false`
validate: function (attrs, opts) {
if (opts && opts.validate === false) {
return;
}
var types = this.get('@type');
if (_.isArray(types)) {
var results = [];
_.each(types, function (type) {
var res = this.validateByType(type, attrs, opts);
if (res) {
results.push(res);
}
}, this);
if (_.isEmpty(results)) {
return;
}
return _.flatten(results);
}
return this.validateByType(types, attrs, opts);
},
validateByType: function (type, attrs, opts) {
var messages = {
max: '<%= property %> cannot contain more than <%= num %> items',
min: '<%= property %> must contain at least <%= num %> items',
required: '<%= property %> is required'
};
if (!type.attributes) {
return;
}
var toError = function (definition, constraint, messageValues) {
return {
property: definition.id,
constraint: constraint,
message: _.template(messages[constraint], _.extend({
property: definition.id
}, messageValues))
};
};
var checkMin = function (definition, attrs) {
if (!attrs[definition.id] || _.isEmpty(attrs[definition.id])) {
return toError(definition, 'required', {});
}
};
// Check the number of items in attr against max
var checkMax = function (definition, attrs) {
if (!attrs[definition.id]) {
return;
}
if (!attrs[definition.id].isCollection && !_.isArray(attrs[definition.id])) {
return;
}
if (attrs[definition.id].length > definition.max) {
return toError(definition, 'max', {
num: definition.max
});
}
};
var results = [];
_.each(type.attributes.list(), function (definition) {
var res;
if (definition.max && definition.max != -1) {
res = checkMax(definition, attrs);
if (res) {
results.push(res);
}
}
if (definition.min && definition.min > 0) {
res = checkMin(definition, attrs);
if (res) {
results.push(res);
}
}
});
if (_.isEmpty(results)) {
return;
}
return results;
},
isNew: function() {
if (this.getSubjectUri().substr(0, 7) === '_:bnode') {
return true;
}
return false;
},
hasChanged: function(attr) {
if (this.markedChanged) {
return true;
}
return Backbone.Model.prototype.hasChanged.call(this, attr);
},
// Force hasChanged to return true
forceChanged: function(changed) {
this.markedChanged = changed ? true : false;
},
// **`getSubject()`** is the getter for the entity identifier.
getSubject: function(){
if (typeof this.id === "undefined") {
this.id = this.attributes[this.idAttribute];
}
if (typeof this.id === 'string') {
if (this.id.substr(0, 7) === 'http://' || this.id.substr(0, 4) === 'urn:') {
return this.toReference(this.id);
}
return this.id;
}
return this.cid.replace('c', '_:bnode');
},
// TODO describe
getSubjectUri: function(){
return this.fromReference(this.getSubject());
},
isReference: function(uri){
var matcher = new RegExp("^\\<([^\\>]*)\\>$");
if (matcher.exec(uri)) {
return true;
}
return false;
},
toReference: function(uri){
if (_.isArray(uri)) {
var self = this;
return _.map(uri, function(part) {
return self.toReference(part);
});
}
var ns = this.vie.namespaces;
var ret = uri;
if (uri.substring(0, 2) === "_:") {
ret = uri;
}
else if (ns.isCurie(uri)) {
ret = ns.uri(uri);
if (ret === "<" + ns.base() + uri + ">") {
/* no base namespace extension with IDs */
ret = '<' + uri + '>';
}
} else if (!ns.isUri(uri)) {
ret = '<' + uri + '>';
}
return ret;
},
fromReference: function(uri){
var ns = this.vie.namespaces;
if (!ns.isUri(uri)) {
return uri;
}
return uri.substring(1, uri.length - 1);
},
as: function(encoding){
if (encoding === "JSON") {
return this.toJSON();
}
if (encoding === "JSONLD") {
return this.toJSONLD();
}
throw new Error("Unknown encoding " + encoding);
},
toJSONLD: function(){
var instanceLD = {};
var instance = this;
_.each(instance.attributes, function(value, name){
var entityValue = value; //instance.get(name);
if (value instanceof instance.vie.Collection) {
entityValue = value.map(function(instance) {
return instance.getSubject();
});
}
// TODO: Handle collections separately
instanceLD[name] = entityValue;
});
instanceLD['@subject'] = instance.getSubject();
return instanceLD;
},
// **`.setOrAdd(arg1, arg2)`** similar to `.set(..)`, `.setOrAdd(..)` can
// be used for setting one or more attributes of an entity, but in
// this case it's a collection of values, not just one. That means, if the
// entity already has the attribute set, make the value to a VIE Collection
// and use the collection as value. The collection can contain entities
// or literals, but not both at the same time.
setOrAdd: function (arg1, arg2, option) {
var entity = this;
if (typeof arg1 === "string" && arg2) {
// calling entity.setOrAdd("rdfs:type", "example:Musician")
entity._setOrAddOne(arg1, arg2, option);
}
else
if (typeof arg1 === "object") {
// calling entity.setOrAdd({"rdfs:type": "example:Musician", ...})
_(arg1).each(function(val, key){
entity._setOrAddOne(key, val, arg2);
});
}
return this;
},
/* attr is always of type string */
/* value can be of type: string,int,double,object,VIE.Entity,VIE.Collection */
/* val can be of type: undefined,string,int,double,array,VIE.Collection */
/* depending on the type of value and the type of val, different actions need to be made */
_setOrAddOne: function (attr, value, options) {
if (!attr || !value)
return;
options = (options)? options : {};
var v;
attr = VIE.Util.mapAttributeNS(attr, self.vie.namespaces);
if (_.isArray(value)) {
for (v = 0; v < value.length; v++) {
this._setOrAddOne(attr, value[v], options);
}
return;
}
if (attr === "@type" && value instanceof self.vie.Type) {
value = value.id;
}
var obj = {};
var existing = Backbone.Model.prototype.get.call(this, attr);
if (!existing) {
obj[attr] = value;
this.set(obj, options);
} else if (existing.isCollection) {
if (value.isCollection) {
value.each(function (model) {
existing.add(model);
});
} else if (value.isEntity) {
existing.add(value);
} else if (typeof value === "object") {
value = new this.vie.Entity(value);
existing.add(value);
} else {
throw new Error("you cannot add a literal to a collection of entities!");
}
this.trigger('change:' + attr, this, value, {});
this.change({});
} else if (_.isArray(existing)) {
if (value.isCollection) {
for (v = 0; v < value.size(); v++) {
this._setOrAddOne(attr, value.at(v).getSubject(), options);
}
} else if (value.isEntity) {
this._setOrAddOne(attr, value.getSubject(), options);
} else if (typeof value === "object") {
value = new this.vie.Entity(value);
this._setOrAddOne(attr, value, options);
} else {
/* yes, we (have to) allow multiple equal values */
existing.push(value);
obj[attr] = existing;
this.set(obj);
}
} else {
var arr = [ existing ];
arr.push(value);
obj[attr] = arr;
return this.set(obj, options);
}
},
// **`.hasType(type)`** determines if the entity has the explicit `type` set.
hasType: function(type){
type = self.vie.types.get(type);
return this.hasPropertyValue("@type", type);
},
// TODO describe
hasPropertyValue: function(property, value) {
var t = this.get(property);
if (!(value instanceof Object)) {
value = self.vie.entities.get(value);
}
if (t instanceof Array) {
return t.indexOf(value) !== -1;
}
else {
return t === value;
}
},
// **`.isof(type)`** determines if the entity is of `type` by explicit or implicit
// declaration. E.g. if Employee is a subtype of Person and e Entity has
// explicitly set type Employee, e.isof(Person) will evaluate to true.
isof: function (type) {
var types = this.get('@type');
if (types === undefined) {
return false;
}
types = (_.isArray(types))? types : [ types ];
type = (self.vie.types.get(type))? self.vie.types.get(type) : new self.vie.Type(type);
for (var t = 0; t < types.length; t++) {
if (self.vie.types.get(types[t])) {
if (self.vie.types.get(types[t]).isof(type)) {
return true;
}
} else {
var typeTmp = new self.vie.Type(types[t]);
if (typeTmp.id === type.id) {
return true;
}
}
}
return false;
},
// TODO describe
addTo : function (collection, update) {
var self = this;
if (collection instanceof self.vie.Collection) {
if (update) {
collection.addOrUpdate(self);
} else {
collection.add(self);
}
return this;
}
throw new Error("Please provide a proper collection of type VIE.Collection as argument!");
},
isEntity: true,
vie: self.vie
});
return new Model(attrs, opts);
};