146 lines
3.7 KiB
HTML
146 lines
3.7 KiB
HTML
<!--
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Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
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This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
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The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
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The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
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Code distributed by Google as part of the polymer project is also
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subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
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-->
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<!--
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`core-meta` provides a method of constructing a self-organizing database.
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It is useful to collate element meta-data for things like catalogs and for
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designer.
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Example, an element folder has a `metadata.html` file in it, that contains a
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`core-meta`, something like this:
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<core-meta id="my-element" label="My Element">
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<property name="color" value="blue"></property>
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</core-meta>
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An application can import as many of these files as it wants, and then use
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`core-meta` again to access the collected data.
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<script>
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var meta = document.createElement('core-meta');
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console.log(meta.list); // dump a list of all meta-data elements that have been created
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</script>
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Use `byId(id)` to retrive a specific core-meta.
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<script>
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var meta = document.createElement('core-meta');
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console.log(meta.byId('my-element'));
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</script>
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By default all meta-data are stored in a single databse. If your meta-data
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have different types and want them to be stored separately, use `type` to
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differentiate them.
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Example:
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<core-meta id="x-foo" type="xElt"></core-meta>
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<core-meta id="x-bar" type="xElt"></core-meta>
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<core-meta id="y-bar" type="yElt"></core-meta>
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<script>
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var meta = document.createElement('core-meta');
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meta.type = 'xElt';
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console.log(meta.list);
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</script>
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@group Polymer Core Elements
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@element core-meta
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@homepage github.io
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-->
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<link rel="import" href="../polymer/polymer.html">
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<polymer-element name="core-meta" attributes="label type" hidden>
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<script>
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(function() {
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var SKIP_ID = 'meta';
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var metaData = {}, metaArray = {};
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Polymer('core-meta', {
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/**
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* The type of meta-data. All meta-data with the same type with be
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* stored together.
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*
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* @attribute type
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* @type string
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* @default 'default'
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*/
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type: 'default',
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alwaysPrepare: true,
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ready: function() {
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this.register(this.id);
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},
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get metaArray() {
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var t = this.type;
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if (!metaArray[t]) {
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metaArray[t] = [];
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}
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return metaArray[t];
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},
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get metaData() {
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var t = this.type;
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if (!metaData[t]) {
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metaData[t] = {};
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}
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return metaData[t];
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},
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register: function(id, old) {
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if (id && id !== SKIP_ID) {
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this.unregister(this, old);
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this.metaData[id] = this;
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this.metaArray.push(this);
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}
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},
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unregister: function(meta, id) {
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delete this.metaData[id || meta.id];
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var i = this.metaArray.indexOf(meta);
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if (i >= 0) {
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this.metaArray.splice(i, 1);
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}
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},
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/**
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* Returns a list of all meta-data elements with the same type.
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*
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* @property list
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* @type array
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* @default []
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*/
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get list() {
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return this.metaArray;
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},
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/**
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* Retrieves meta-data by ID.
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*
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* @method byId
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* @param {String} id The ID of the meta-data to be returned.
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* @returns Returns meta-data.
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*/
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byId: function(id) {
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return this.metaData[id];
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}
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});
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})();
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</script>
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</polymer-element>
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