preferences object
This commit is contained in:
Sergey Solovyev
234
src/main/java/org/solovyev/android/ResourceCache.java
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234
src/main/java/org/solovyev/android/ResourceCache.java
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/*
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* Copyright (c) 2009-2011. Created by serso aka se.solovyev.
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* For more information, please, contact se.solovyev@gmail.com
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* or visit http://se.solovyev.org
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*/
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package org.solovyev.android;
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import android.app.Activity;
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import android.content.Context;
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import android.content.res.Configuration;
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import android.content.res.Resources;
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import android.util.Log;
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import android.view.View;
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import android.widget.Button;
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import org.jetbrains.annotations.NotNull;
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import org.jetbrains.annotations.Nullable;
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import org.solovyev.android.calculator.CalculatorActivity;
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import org.solovyev.android.view.widgets.DragButton;
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import java.lang.reflect.Field;
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import java.lang.reflect.Modifier;
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import java.util.*;
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/**
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* User: serso
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* Date: 11/25/11
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* Time: 1:52 PM
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*/
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public enum ResourceCache {
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instance;
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@NotNull
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private static final Locale DEFAULT_LOCALE = Locale.ENGLISH;
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// ids of drag buttons in R.class
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private List<Integer> dragButtonIds = null;
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// ids of buttons in R.class
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private List<Integer> buttonIds = null;
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// first map: key: language id, value: map of captions and translations
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// second mal: key: caption id, value: translation
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private final Map<String, Map<String, String>> captions = new HashMap<String, Map<String, String>>();
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private Class<?> resourceClass;
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private Context context;
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@NotNull
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private final NameToIdCache nameToIdCache = new NameToIdCache();
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public List<Integer> getDragButtonIds() {
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return dragButtonIds;
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}
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public List<Integer> getButtonIds() {
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return buttonIds;
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}
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/**
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* Method load captions for default locale using android R class
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*
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* @param context STATIC CONTEXT
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* @param resourceClass class of captions in android (SUBCLASS of R class)
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*/
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public void initCaptions(@NotNull Context context, @NotNull Class<?> resourceClass) {
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initCaptions(context, resourceClass, Locale.getDefault());
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}
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/**
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* Method load captions for specified locale using android R class
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*
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* @param context STATIC CONTEXT
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* @param resourceClass class of captions in android (SUBCLASS of R class)
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* @param locale language to be used for translation
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*/
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public void initCaptions(@NotNull Context context, @NotNull Class<?> resourceClass, @NotNull Locale locale) {
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assert this.resourceClass == null || this.resourceClass.equals(resourceClass);
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this.context = context;
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this.resourceClass = resourceClass;
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if (!initialized(locale)) {
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final Map<String, String> captionsByLanguage = new HashMap<String, String>();
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final Locale defaultLocale = Locale.getDefault();
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try {
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if (!defaultLocale.getLanguage().equals(locale.getLanguage())) {
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updateConfiguration(context, locale);
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}
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for (Field field : resourceClass.getDeclaredFields()) {
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int modifiers = field.getModifiers();
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if (Modifier.isFinal(modifiers) && Modifier.isStatic(modifiers)) {
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try {
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int captionId = field.getInt(resourceClass);
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captionsByLanguage.put(field.getName(), context.getString(captionId));
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} catch (IllegalAccessException e) {
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Log.e(ResourceCache.class.getName(), e.getMessage());
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} catch (Resources.NotFoundException e) {
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Log.e(ResourceCache.class.getName(), "Caption with name " + field.getName() + " was not found for " + locale.getLanguage() + " language: " + e.getMessage());
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}
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}
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}
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} finally {
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if (!defaultLocale.getLanguage().equals(locale.getLanguage())) {
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updateConfiguration(context, defaultLocale);
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}
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}
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captions.put(locale.getLanguage(), captionsByLanguage);
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}
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}
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private static void updateConfiguration(@NotNull Context context, @NotNull Locale locale) {
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Locale.setDefault(locale);
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final Configuration config = new Configuration();
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config.locale = locale;
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context.getResources().updateConfiguration(config, context.getResources().getDisplayMetrics());
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}
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private boolean initialized(@NotNull Locale locale) {
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return captions.containsKey(locale.getLanguage());
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}
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/**
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* @param captionId id of caption to be translated
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* @return translation by caption id in default language, null if no translation in default language present
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*/
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@Nullable
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public String getCaption(@NotNull String captionId) {
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return getCaption(captionId, Locale.getDefault());
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}
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/**
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* @param captionId id of caption to be translated
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* @param locale language to be used for translation
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* @return translation by caption id in specified language, null if no translation in specified language present
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*/
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@Nullable
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public String getCaption(@NotNull String captionId, @NotNull final Locale locale) {
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Map<String, String> captionsByLanguage = captions.get(locale.getLanguage());
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if (captionsByLanguage != null) {
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return getCaption(captionsByLanguage, captionId, locale);
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} else {
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assert resourceClass != null && context != null;
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initCaptions(context, resourceClass, locale);
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captionsByLanguage = captions.get(locale.getLanguage());
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if (captionsByLanguage != null) {
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return getCaption(captionsByLanguage, captionId, locale);
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}
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}
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return null;
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}
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@Nullable
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private String getCaption(@NotNull Map<String, String> captionsByLanguage, @NotNull String captionId, @NotNull Locale locale) {
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String result = captionsByLanguage.get(captionId);
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if (result == null && !locale.getLanguage().equals(DEFAULT_LOCALE.getLanguage())) {
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result = getCaption(captionId, DEFAULT_LOCALE);
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}
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return result;
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}
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public void init(@NotNull Class<?> resourceClass, @NotNull Activity activity) {
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dragButtonIds = new ArrayList<Integer>();
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buttonIds = new ArrayList<Integer>();
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for (Field field : resourceClass.getDeclaredFields()) {
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int modifiers = field.getModifiers();
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if (Modifier.isFinal(modifiers) && Modifier.isStatic(modifiers)) {
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try {
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int viewId = field.getInt(resourceClass);
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final View view = activity.findViewById(viewId);
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if (view instanceof DragButton) {
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dragButtonIds.add(viewId);
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}
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if (view instanceof Button) {
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buttonIds.add(viewId);
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}
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} catch (IllegalAccessException e) {
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Log.e(ResourceCache.class.getName(), e.getMessage());
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}
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}
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}
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}
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@NotNull
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public Map<String, Integer> getNameToIdCache(@NotNull Class<?> clazz) {
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return this.nameToIdCache.getCache(clazz);
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}
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private static class NameToIdCache {
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@NotNull
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private final Map<Class<?>, Map<String, Integer>> caches = new HashMap<Class<?>, Map<String, Integer>>(3);
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// not intended for instantiation
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private NameToIdCache() {
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}
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@NotNull
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public Map<String, Integer> getCache(@NotNull Class<?> clazz) {
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Map<String, Integer> result = caches.get(clazz);
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if (result == null) {
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result = new HashMap<String, Integer>();
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for (Field field : clazz.getDeclaredFields()) {
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int modifiers = field.getModifiers();
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if (Modifier.isFinal(modifiers) && Modifier.isStatic(modifiers)) {
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try {
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result.put(field.getName(), field.getInt(clazz));
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} catch (IllegalAccessException e) {
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Log.e(CalculatorActivity.class.getName(), e.getMessage());
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}
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}
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}
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caches.put(clazz, result);
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}
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return result;
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}
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}
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}
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