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431af3adbc
Implement a cache to store domain object models, to allow the cache for individual objects to distinguish objects based on their parentage and avoid ambiguous Remove actions (WTD-473.)
42 lines
1.3 KiB
JavaScript
42 lines
1.3 KiB
JavaScript
/*global define*/
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define(
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[],
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function () {
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"use strict";
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/**
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* An editable model cache stores domain object models that have been
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* made editable, to support a group that can be saved all-at-once.
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* This is useful in Edit mode, which is launched for a specific
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* object but may contain changes across many objects.
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* @constructor
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*/
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function EditableModelCache() {
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var cache = {};
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// Deep-copy a model. Models are JSONifiable, so this can be
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// done by stringification then destringification
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function clone(model) {
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return JSON.parse(JSON.stringify(model));
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}
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return {
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/**
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* Get this domain object's model from the cache (or
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* place it in the cache if it isn't in the cache yet)
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* @returns a clone of the domain object's model
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*/
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getCachedModel: function (domainObject) {
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var id = domainObject.getId();
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return (cache[id] =
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cache[id] || clone(domainObject.getModel()));
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}
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};
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}
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return EditableModelCache;
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}
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); |