AndroidLocaleDelegate.android.kt
/*
* Copyright 2019 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.compose.ui.text.intl
import androidx.annotation.RequiresApi
import android.os.LocaleList as AndroidLocaleList
import java.util.Locale as JavaLocale
import androidx.compose.ui.text.platform.createSynchronizedObject
/**
* An Android implementation of Locale object
*/
internal class AndroidLocale(val javaLocale: JavaLocale) : PlatformLocale {
override val language: String
get() = javaLocale.language
override val script: String
get() = javaLocale.script
override val region: String
get() = javaLocale.country
override fun toLanguageTag(): String = javaLocale.toLanguageTag()
}
/**
* An Android implementation of LocaleDelegate object for API 23
*/
internal class AndroidLocaleDelegateAPI23 : PlatformLocaleDelegate {
override val current: LocaleList
get() = LocaleList(listOf(Locale(AndroidLocale(JavaLocale.getDefault()))))
override fun parseLanguageTag(languageTag: String): PlatformLocale =
AndroidLocale(JavaLocale.forLanguageTag(languageTag))
}
/**
* An Android implementation of LocaleDelegate object for API 24 and later
*/
@RequiresApi(api = 24)
internal class AndroidLocaleDelegateAPI24 : PlatformLocaleDelegate {
private var lastPlatformLocaleList: AndroidLocaleList? = null
private var lastLocaleList: LocaleList? = null
private val lock = createSynchronizedObject()
override val current: LocaleList
get() {
val platformLocaleList = AndroidLocaleList.getDefault()
return synchronized(lock) {
// try to avoid any more allocs
lastLocaleList?.let {
if (platformLocaleList === lastPlatformLocaleList) return it
}
// this is faster than adding to an empty mutableList
val localeList = LocaleList(
List(platformLocaleList.size()) { position ->
Locale(AndroidLocale(platformLocaleList[position]))
}
)
// cache the platform result and compose result
lastPlatformLocaleList = platformLocaleList
lastLocaleList = localeList
localeList
}
}
override fun parseLanguageTag(languageTag: String): PlatformLocale =
AndroidLocale(JavaLocale.forLanguageTag(languageTag))
}