webui: register construction spec based on existing spec

Useful for declarative inheritance. E.g. base new facet on details
facet with all registered preops and default spec object.

Reviewed-By: David Kupka <dkupka@redhat.com>
Reviewed-By: Thierry Bordaz <tbordaz@redhat.com>

2 files changed, 50 insertions, 23 deletions

diff --git a/install/ui/src/freeipa/_base/Builder.js b/install/ui/src/freeipa/_base/Builder.js
index 9433a8126..029f8947f 100644
--- a/install/ui/src/freeipa/_base/Builder.js
+++ b/install/ui/src/freeipa/_base/Builder.js
@@ -188,21 +188,13 @@ define(['dojo/_base/declare',
         },
 
         /**
-         * Build single object
-         * @protected
-         */
-        _build: function(spec, context) {
-            var cs = this._get_construction_spec(spec);
-            var obj = this._build_core(cs, context);
-            return obj;
-        },
-
-        /**
-         * Normalizes construction specification
-         * @protected
+         * Create new construction spec from an existing one based on object
+         * specification object and save the new construction spec
+         *
+         * @param  {Object}             spec        Specification object
+         * @return {Object}                         Construction specification
          */
-        _get_construction_spec: function(spec) {
-
+        merge_spec: function(spec, force_mixin) {
             var cs = {};
 
             if (typeof spec === 'function') {
@@ -219,7 +211,7 @@ define(['dojo/_base/declare',
             } else if (typeof spec === 'object') {
                 var c = spec.$ctor,
                     f = spec.$factory,
-                    m = spec.$mixim_spec,
+                    m = spec.$mixim_spec || force_mixin,
                     t = spec.$type,
                     pre = spec.$pre_ops,
                     post = spec.$post_ops;
@@ -251,7 +243,26 @@ define(['dojo/_base/declare',
                 if (pre) cs.pre_ops.push.apply(cs.pre_ops, pre);
                 if (post) cs.post_ops.push.apply(cs.post_ops, post);
             }
+            return cs;
+        },
+
+        /**
+         * Build single object
+         * @protected
+         */
+        _build: function(spec, context) {
+            var cs = this._get_construction_spec(spec);
+            var obj = this._build_core(cs, context);
+            return obj;
+        },
+
+        /**
+         * Normalizes construction specification
+         * @protected
+         */
+        _get_construction_spec: function(spec) {
 
+            var cs = this.merge_spec(spec);
             cs.spec = cs.spec || {};
             if (!cs.factory && !cs.ctor) {
                 if (this.ctor) cs.ctor = this.ctor;
diff --git a/install/ui/src/freeipa/_base/Singleton_registry.js b/install/ui/src/freeipa/_base/Singleton_registry.js
index 6aa105456..0c89e65bf 100644
--- a/install/ui/src/freeipa/_base/Singleton_registry.js
+++ b/install/ui/src/freeipa/_base/Singleton_registry.js
@@ -106,13 +106,7 @@ define(['dojo/_base/declare',
          * @return {Object}
          */
         register: function(type, func, default_spec) {
-            if (!lang.exists('builder.registry', this)) {
-                throw {
-                    error: 'Object Initialized Exception: builder not initalized',
-                    context: this
-                };
-            }
-
+            this._check_builder();
             this.builder.registry.register(type, func, default_spec);
         },
 
@@ -125,13 +119,35 @@ define(['dojo/_base/declare',
          * @param {Object} construct_spec Construction specification
          */
         copy: function(org_type, new_type, construct_spec) {
+            this._check_builder();
+            this.builder.registry.copy(org_type, new_type, construct_spec);
+        },
+
+        /**
+         * Create new construction specification based on an existing one and
+         * a specification object. Save it as a new type.
+         * @param  {string|Function} type New type or a callback to get
+         *                                the type: `callback(spec)`
+         * @param  {Object} spec Construction specification
+         */
+        register_from_spec: function(type, spec) {
+            this._check_builder();
+            var cs = this.builder.merge_spec(spec, true);
+            if (typeof type === 'function') {
+                cs.type = type(cs.spec);
+            } else {
+                cs.type = type;
+            }
+            this.builder.registry.register(cs);
+        },
+
+        _check_builder: function() {
             if (!lang.exists('builder.registry', this)) {
                 throw {
                     error: 'Object Initialized Exception: builder not initalized',
                     context: this
                 };
             }
-            this.builder.registry.copy(org_type, new_type, construct_spec);
         },
 
         constructor: function(spec) {