[Info Bubble] Add metadata capability

Add metadata capability, which will be used to populate
contents of an info bubble. WTD-884.

platform/core/bundle.json

@@ -165,6 +165,10 @@
                 "implementation": "capabilities/PersistenceCapability.js",
                 "depends": [ "persistenceService", "PERSISTENCE_SPACE" ]
             },
+            {
+                "key": "metadata",
+                "implementation": "capabilities/MetadataCapability.js"
+            },
             {
                 "key": "mutation",
                 "implementation": "capabilities/MutationCapability.js",

platform/core/src/capabilities/MetadataCapability.js

@@ -0,0 +1,62 @@
+/*global define*/
+
+define(
+    function () {
+        "use strict";
+
+        /**
+         * A piece of information about a domain object.
+         * @typedef {Object} MetadataProperty
+         * @property {string} name the human-readable name of this property
+         * @property {string} value the human-readable value of this property,
+         *           for this specific domain object
+         */
+
+        /**
+         * Implements the `metadata` capability of a domain object, providing
+         * properties of that object for display.
+         *
+         * Usage: `domainObject.useCapability("metadata")`
+         *
+         * ...which will return an array of objects containing `name` and
+         * `value` properties describing that domain object (suitable for
+         * display.)
+         *
+         * @constructor
+         */
+        function MetadataCapability(domainObject) {
+            return {
+                /**
+                 * Get metadata about this object.
+                 * @returns {MetadataProperty[]} metadata about this object
+                 */
+                invoke: function () {
+                    var type = domainObject.getCapability('type'),
+                        model = domainObject.getModel(),
+                        metadata = [{
+                            name: "ID",
+                            value: domainObject.getId()
+                        }];
+
+                    function addProperty(typeProperty) {
+                        var name = typeProperty.getDefinition().name,
+                            value = typeProperty.getValue(model);
+                        if (typeof value === 'string' ||
+                                typeof value === 'number') {
+                            metadata.push({
+                                name: name,
+                                value: value
+                            });
+                        }
+                    }
+
+                    (type ? type.getProperties() : []).forEach(addProperty);
+
+                    return metadata;
+                }
+            };
+        }
+
+        return MetadataCapability;
+    }
+);