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 */
14package 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 */
20public 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     */
28    public Object getFacet(Class<?> facetClass);
29
30}
31