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/*
* Copyright (C) 2016 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.dialer.app.contactinfo;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v7.app.AppCompatActivity;
import com.android.dialer.phonenumbercache.ContactInfo;
import com.android.dialer.util.ExpirableCache;
/**
* Fragment without any UI whose purpose is to retain an instance of {@link ExpirableCache} across
* configuration change through the use of {@link #setRetainInstance(boolean)}. This is done as
* opposed to implementing {@link android.os.Parcelable} as it is a less widespread change.
*/
public class ExpirableCacheHeadlessFragment extends Fragment {
private static final String FRAGMENT_TAG = "ExpirableCacheHeadlessFragment";
private static final int CONTACT_INFO_CACHE_SIZE = 100;
private ExpirableCache<NumberWithCountryIso, ContactInfo> retainedCache =
ExpirableCache.create(CONTACT_INFO_CACHE_SIZE);
@NonNull
public static ExpirableCacheHeadlessFragment attach(@NonNull AppCompatActivity parentActivity) {
return attach(parentActivity.getSupportFragmentManager());
}
@NonNull
private static ExpirableCacheHeadlessFragment attach(FragmentManager fragmentManager) {
ExpirableCacheHeadlessFragment fragment =
(ExpirableCacheHeadlessFragment) fragmentManager.findFragmentByTag(FRAGMENT_TAG);
if (fragment == null) {
fragment = new ExpirableCacheHeadlessFragment();
// Allowing state loss since in rare cases this is called after activity's state is saved and
// it's fine if the cache is lost.
fragmentManager.beginTransaction().add(fragment, FRAGMENT_TAG).commitNowAllowingStateLoss();
}
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setRetainInstance(true);
}
public ExpirableCache<NumberWithCountryIso, ContactInfo> getRetainedCache() {
return retainedCache;
}
}
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