compute() {
let { lastPath, innerReference, innerTag } = this;
let path = this.lastPath = this.pathReference.value();
if (path !== lastPath) {
if (path !== undefined && path !== null) {
let pathType = typeof path;
if (pathType === 'string') {
innerReference = referenceFromParts(this.sourceReference, path.split('.'));
} else if (pathType === 'number') {
innerReference = this.sourceReference.get('' + path);
}
innerTag.update(innerReference.tag);
} else {
innerReference = NULL_REFERENCE;
innerTag.update(CONSTANT_TAG);
}
this.innerReference = innerReference;
}
return innerReference.value();
}
static create(sourceReference, pathReference) {
if (isConst(pathReference)) {
let parts = pathReference.value().split('.');
return referenceFromParts(sourceReference, parts);
} else {
return new GetHelperReference(sourceReference, pathReference);
}
}
