ClassPresenterSelector.java revision 0f1fa0dfa946ddc8afb6af26a4dd1a4d01dca10f 
1/*
2 * Copyright (C) 2014 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
16import java.util.HashMap;
17
18/**
19 * A ClassPresenterSelector selects a {@link Presenter} based on the item's
20 * Java class.
21 */
22public final class ClassPresenterSelector extends PresenterSelector {
23
24    private final HashMap<Class<?>, Presenter> mClassMap = new HashMap<Class<?>, Presenter>();
25
26    public void addClassPresenter(Class<?> cls, Presenter presenter) {
27        mClassMap.put(cls, presenter);
28    }
29
30    @Override
31    public Presenter getPresenter(Object item) {
32        Class<?> cls = item.getClass();
33        Presenter presenter = null;
34
35        do {
36            presenter = mClassMap.get(cls);
37            cls = cls.getSuperclass();
38        } while (presenter == null && cls != null);
39
40        return presenter;
41    }
42}
43