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/*
* Copyright (C) 2020 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.systemui.controls
import android.content.ComponentName
import android.graphics.drawable.Icon
import androidx.annotation.GuardedBy
import com.android.systemui.dagger.SysUISingleton
import javax.inject.Inject
/**
* Icon cache for custom icons sent with controls.
*
* It assumes that only one component can be current at the time, to minimize the number of icons
* stored at a given time.
*/
@SysUISingleton
class CustomIconCache @Inject constructor() {
private var currentComponent: ComponentName? = null
@GuardedBy("cache")
private val cache: MutableMap<String, Icon> = LinkedHashMap()
/**
* Store an icon in the cache.
*
* If the icons currently stored do not correspond to the component to be stored, the cache is
* cleared first.
*/
fun store(component: ComponentName, controlId: String, icon: Icon?) {
if (component != currentComponent) {
clear()
currentComponent = component
}
synchronized(cache) {
if (icon != null) {
cache.put(controlId, icon)
} else {
cache.remove(controlId)
}
}
}
/**
* Retrieves a custom icon stored in the cache.
*
* It will return null if the component requested is not the one whose icons are stored, or if
* there is no icon cached for that id.
*/
fun retrieve(component: ComponentName, controlId: String): Icon? {
if (component != currentComponent) return null
return synchronized(cache) {
cache.get(controlId)
}
}
private fun clear() {
synchronized(cache) {
cache.clear()
}
}
}
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