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 androidx.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 */ 28 public Object getFacet(Class<?> facetClass); 29 30 } 31
