invocation.js
2.35 KB
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/******************************************************************************
* Invocation implementation
* ***************************************************************************/
/**
* Defines an invocation
* @param destination {object} component on which to perform invocation
* @param slot {string} name of the slot
* @param value {mixed} value passed to the invoked slot
* @constructor
*/
let Invocation = function (destination, slot, value) {
this.getDestination = function () {
return destination;
};
this.getSlot = function () {
return slot;
};
this.getValue = function () {
return value;
};
this.invoke = function () {
var func = destination[slot];
if (func === undefined) {
console.error("Undefined slot %s of component %s", slot, destination);
return;
}
func.apply(destination, value);
};
};
/**
* Helper function that casts an invocation from a description
* @param obj {object} a raw description of the invocation
* @param context {object} the context in which this invocation takes place.
* @return an invocation
*/
Invocation.cast = function (obj, context) {
let component = context.getComponent(obj.destination);
if (component === undefined) {
console.error("[ARCS] Destination ",obj.destination, " is undefined");
}
if (obj.value !== undefined) {
return new Invocation(component, obj.slot, obj.value);
}
// this one looks odd, seems there is a failure in the logic.
if (obj.ref !== undefined) {
return new Invocation(component, obj.slot, context.getConstant(obj.ref));
}
if (obj.storage !== undefined) {
let data = null;
if (typeof(localStorage) !== "undefined") {
let item = localStorage.getItem(storage.key);
if (item === null) {
if (typeof (obj.storage.default) !== "undefined") {
data = obj.storage.default;
}
}
}
return new Invocation(component, obj.slot, data);
}
};
/*ARCS.Invocation.revert = function(obj, context) {
return {
destination: context
};
};*/
Invocation.PRE_CONNECTION = 0;
Invocation.POST_CONNECTION = 1;
Invocation.CLEAN_UP = 2;
export default Invocation;