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/*
* Copyright (C) 2011 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.util;
import android.content.Context;
import android.content.res.Configuration;
import android.content.res.Resources;
import java.util.Locale;
/**
* Utility class to save and restore the locale of the system.
* <p>
* This can be used for tests that assume to be run in a certain locale, e.g., because they
* check against strings in a particular language or require an assumption on how the system
* will behave in a specific locale.
* <p>
* In your test, you can change the locale with the following code:
* <pre>
* public class CanadaFrenchTest extends AndroidTestCase {
* private LocaleTestUtils mLocaleTestUtils;
*
* @Override
* public void setUp() throws Exception {
* super.setUp();
* mLocaleTestUtils = new LocaleTestUtils(getContext());
* mLocaleTestUtils.setLocale(Locale.CANADA_FRENCH);
* }
*
* @Override
* public void tearDown() throws Exception {
* mLocaleTestUtils.restoreLocale();
* mLocaleTestUtils = null;
* super.tearDown();
* }
*
* ...
* }
* </pre>
* Note that one should not call {@link #setLocale(Locale)} more than once without calling
* {@link #restoreLocale()} first.
* <p>
* This class is not thread-safe. Usually its methods should be invoked only from the test thread.
*/
public class LocaleTestUtils {
private final Context mContext;
private boolean mSaved;
private Locale mSavedContextLocale;
private Locale mSavedSystemLocale;
/**
* Create a new instance that can be used to set and reset the locale for the given context.
*
* @param context the context on which to alter the locale
*/
public LocaleTestUtils(Context context) {
mContext = context;
mSaved = false;
}
/**
* Set the locale to the given value and saves the previous value.
*
* @param locale the value to which the locale should be set
* @throws IllegalStateException if the locale was already set
*/
public void setLocale(Locale locale) {
if (mSaved) {
throw new IllegalStateException(
"call restoreLocale() before calling setLocale() again");
}
mSavedContextLocale = setResourcesLocale(mContext.getResources(), locale);
mSavedSystemLocale = setResourcesLocale(Resources.getSystem(), locale);
mSaved = true;
}
/**
* Restores the previously set locale.
*
* @throws IllegalStateException if the locale was not set using {@link #setLocale(Locale)}
*/
public void restoreLocale() {
if (!mSaved) {
throw new IllegalStateException("call setLocale() before calling restoreLocale()");
}
setResourcesLocale(mContext.getResources(), mSavedContextLocale);
setResourcesLocale(Resources.getSystem(), mSavedSystemLocale);
mSaved = false;
}
/**
* Sets the locale for the given resources and returns the previous locale.
*
* @param resources the resources on which to set the locale
* @param locale the value to which to set the locale
* @return the previous value of the locale for the resources
*/
private Locale setResourcesLocale(Resources resources, Locale locale) {
Configuration contextConfiguration = new Configuration(resources.getConfiguration());
Locale savedLocale = contextConfiguration.locale;
contextConfiguration.locale = locale;
resources.updateConfiguration(contextConfiguration, null);
return savedLocale;
}
}
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