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var Q = require('q');
/**
* OKQuery!
* Takes a query spec for a resource and maps it the proper read
* methods of that resource. This is simply to separate the notions
* of queries and resources.
*/
function OKQuery(options) {
if (!(this instanceof OKQuery)) return new OKQuery(options);
options = options || {};
if (!options.resource)
throw new Error('No resource provided to query');
var resource = options.resource;
var type = resource.type;
var query = options.query || '*';
Object.defineProperty(this, 'resource', {
value: resource,
writable: false
});
Object.defineProperty(this, 'type', {
value: resource.type,
writable: false
});
this.get = createQuery(resource, query, {
default: options.default
});
}
function createQuery(resource, query, options) {
options = options || {};
var query;
if (isDynamic(query)) {
query = queryDynamic(resource);
} else if (isSet(query)) {
query = queryAll(resource);
} else {
query = querySingle(resource, query);
}
if (options.default)
query = withDefault(query, options.default);
return query;
}
function queryDynamic(resource) {
return function(id) {
return resource.get(id);
}
}
function queryAll(resource) {
return function() {
return resource.all();
}
}
function querySingle(resource, id) {
return function() {
return resource.get(id);
}
}
function withDefault(queryFn, resultDefault) {
return function() {
return Q.Promise(function(resolve, reject) {
queryFn().then(function(data) {
data = data || resultDefault;
resolve(data);
}, reject);
});
};
}
function isDynamic(query) {
return query && query.charAt(0) === ':';
}
function isSet(query) {
return query && query === '*';
}
module.exports = OKQuery;
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