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association.js
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association.js
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var Promise = require("bluebird");
var FieldType= require("prometheus-resource").FieldType;
var ResourceTypeManager = require("prometheus-resource").ResourceTypeManager;
var ResourceManager = require("prometheus-resource").ResourceManager;
/**
* A field type. Connects resource type `from_type_name` with resource type `to_type_name`
* @memberOf field-type-manager
* @this {Association}
* @param {string} from_type_name
* @param {string} to_type_name
* @class
* @extends FieldType
* @inner
*/
var Association = function(arguments){
this.from_type_name = arguments.from_type_name;
this.to_type_name = arguments.to_type_name;
//console.log("to_type_name:", this.to_type_name);
}
/**
* implements @link FieldType~isProperValue
* @override
* @this {Association}
* @param {any} value
* @return {Promise}
*/
Association.prototype = Object.create(FieldType.prototype)
Association.prototype.isProperValue = function(value){
var that = this;
//console.log("association.isProperValue");
return new Promise(function(resolve, reject){
var id = parseInt(value);
if(isNaN(id)){
reject(value + " is not a number");
}
ResourceManager.idExists(value, that.to_type_name, function(exists){
if(exists){
resolve();
}else{
reject(that.to_type_name + " of id " + value + " does not exist");
}
});
})
}
Association.prototype.encode = function(value_in_code){
return new Promise(function(resolve, reject){
switch(typeof value_in_code){
case "string":
var id = parseInt(value_in_code);
if(isNaN(id)){
reject();
}else{
resolve(id);
}
break;
case "number":
resolve(value_in_code);
break;
case "object":
resolve(value_in_code.prometheus_id);
break;
default:
//console.log("reject");
reject();
break;
}
});
}
Association.prototype.decode = function(value_in_database){
return ResourceManager.getResourceByID(value_in_database);
}
module.exports.field_type_name = "association";
module.exports.constructor = Association;

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