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/*
* Copyright (C) 2015 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.launcher3.model;
import android.content.Context;
import com.android.launcher3.ItemInfo;
import com.android.launcher3.compat.UserHandleCompat;
import com.android.launcher3.compat.UserManagerCompat;
import java.util.Comparator;
import java.util.HashMap;
/**
* A comparator to arrange items based on user profiles.
*/
public abstract class AbstractUserComparator<T extends ItemInfo> implements Comparator<T> {
private HashMap<UserHandleCompat, Long> mUserSerialCache = new HashMap<>();
private final UserManagerCompat mUserManager;
private final UserHandleCompat mMyUser;
public AbstractUserComparator(Context context) {
mUserManager = UserManagerCompat.getInstance(context);
mMyUser = UserHandleCompat.myUserHandle();
}
@Override
public int compare(T lhs, T rhs) {
if (mMyUser.equals(lhs.user)) {
return -1;
} else {
Long aUserSerial = getAndCacheUserSerial(lhs.user);
Long bUserSerial = getAndCacheUserSerial(rhs.user);
return aUserSerial.compareTo(bUserSerial);
}
}
/**
* Returns the user serial for this user, using a cached serial if possible.
*/
private Long getAndCacheUserSerial(UserHandleCompat user) {
Long userSerial = mUserSerialCache.get(user);
if (userSerial == null) {
userSerial = mUserManager.getSerialNumberForUser(user);
mUserSerialCache.put(user, userSerial);
}
return userSerial;
}
public void clearUserCache() {
mUserSerialCache.clear();
}
}
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