SafeWindowExtensionsProvider.kt
/*
* Copyright 2023 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 androidx.window
import androidx.window.extensions.WindowExtensions
import androidx.window.extensions.WindowExtensionsProvider
import androidx.window.reflection.ReflectionUtils
import androidx.window.reflection.ReflectionUtils.doesReturn
import androidx.window.reflection.ReflectionUtils.isPublic
import androidx.window.reflection.WindowExtensionsConstants
internal class SafeWindowExtensionsProvider(private val loader: ClassLoader) {
val windowExtensions: WindowExtensions?
get() {
return try {
if (isWindowExtensionsPresent() && isWindowExtensionsValid()) {
WindowExtensionsProvider.getWindowExtensions()
} else null
} catch (e: Exception) {
null
}
}
internal val windowExtensionsClass: Class<*>
get() {
return loader.loadClass(WindowExtensionsConstants.WINDOW_EXTENSIONS_CLASS)
}
internal fun isWindowExtensionsValid(): Boolean {
return isWindowExtensionsPresent() &&
ReflectionUtils.validateReflection(
"WindowExtensionsProvider#getWindowExtensions is not valid"
) {
val providerClass = windowExtensionsProviderClass
val getWindowExtensionsMethod = providerClass
.getDeclaredMethod("getWindowExtensions")
val windowExtensionsClass = windowExtensionsClass
getWindowExtensionsMethod.doesReturn(windowExtensionsClass) &&
getWindowExtensionsMethod.isPublic
}
}
private fun isWindowExtensionsPresent(): Boolean {
return ReflectionUtils.checkIsPresent {
loader.loadClass(WindowExtensionsConstants.WINDOW_EXTENSIONS_PROVIDER_CLASS)
}
}
private val windowExtensionsProviderClass: Class<*>
get() {
return loader.loadClass(WindowExtensionsConstants.WINDOW_EXTENSIONS_PROVIDER_CLASS)
}
}