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/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.tv.util;
import android.content.Context;
import android.util.SparseArray;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import java.util.ArrayList;
/** A cache for the views. */
public class ViewCache {
private static final SparseArray<ArrayList<View>> mViews = new SparseArray();
private static ViewCache sViewCache;
private ViewCache() {}
/** Returns an instance of the view cache. */
public static ViewCache getInstance() {
if (sViewCache == null) {
sViewCache = new ViewCache();
}
return sViewCache;
}
/** Returns if the view cache is empty. */
public boolean isEmpty() {
return mViews.size() == 0;
}
/** Stores a view into this view cache. */
public void putView(int resId, View view) {
ArrayList<View> views = mViews.get(resId);
if (views == null) {
views = new ArrayList();
mViews.put(resId, views);
}
views.add(view);
}
/** Stores multi specific views into the view cache. */
public void putView(Context context, int resId, ViewGroup fakeParent, int num) {
LayoutInflater inflater =
(LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
ArrayList<View> views = mViews.get(resId);
if (views == null) {
views = new ArrayList<>();
mViews.put(resId, views);
}
for (int i = 0; i < num; i++) {
View view = inflater.inflate(resId, fakeParent, false);
views.add(view);
}
}
/** Returns the view for specific resource id. */
public View getView(int resId) {
ArrayList<View> views = mViews.get(resId);
if (views != null && !views.isEmpty()) {
View view = views.remove(views.size() - 1);
if (views.isEmpty()) {
mViews.remove(resId);
}
return view;
} else {
return null;
}
}
/** Returns the view if exists, or create a new view for the specific resource id. */
public View getOrCreateView(LayoutInflater inflater, int resId, ViewGroup container) {
View view = getView(resId);
if (view == null) {
view = inflater.inflate(resId, container, false);
}
return view;
}
/** Clears the view cache. */
public void clear() {
mViews.clear();
}
}
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