1 /*
2  * Copyright (C) 2015 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
5  * in compliance with the License. You may obtain a copy of the License at
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software distributed under the License
10  * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
11  * or implied. See the License for the specific language governing permissions and limitations under
12  * the License.
13  */
14 package android.support.v17.leanback.widget;
15 
16 /**
17  * This is the query interface to supply optional features(aka facets) on an object without the need
18  * of letting the object to subclass or implement java interfaces.
19  */
20 public interface FacetProvider {
21 
22     /**
23      * Queries optional implemented facet.
24      * @param facetClass  Facet classes to query,  examples are: class of
25      *                    {@link ItemAlignmentFacet}.
26      * @return Facet implementation for the facetClass or null if feature not implemented.
27      */
getFacet(Class<?> facetClass)28     public Object getFacet(Class<?> facetClass);
29 
30 }
31