package com.googlecode.gwt.test.internal.i18n;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.util.Locale;
import java.util.Properties;
import com.google.gwt.i18n.client.LocalizableResource;
import com.google.gwt.i18n.client.LocalizableResource.DefaultLocale;
import com.google.gwt.i18n.client.LocalizableResource.Key;
import com.googlecode.gwt.test.exceptions.GwtTestI18NException;
import com.googlecode.gwt.test.internal.GwtConfig;
import com.googlecode.gwt.test.internal.utils.GwtPropertiesHelper;
import com.googlecode.gwt.test.utils.GwtReflectionUtils;
abstract class LocalizableResourceInvocationHandler implements InvocationHandler {
private final Class<? extends LocalizableResource> proxiedClass;
public LocalizableResourceInvocationHandler(Class<? extends LocalizableResource> proxiedClass) {
this.proxiedClass = proxiedClass;
}
public Class<? extends LocalizableResource> getProxiedClass() {
return proxiedClass;
}
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
// try in the locale specific .properties of the class
Object result = extractLocaleSpecificValue(proxiedClass, method, args);
if (result != null) {
return result;
}
// try in the locale specific .properties of the parent class
result = recurseExtractFromParentLocaleSpecificResource(proxiedClass.getInterfaces(), method,
args);
if (result != null) {
return result;
}
// try to get the value from a .properties without locale
result = extractFromDefaultProperties(proxiedClass, method, args);
Properties prop = GwtPropertiesHelper.get().getProperties(
getPropertiesFilePrefix(proxiedClass));
if (prop != null) {
result = extractFromProperties(prop, method, args, null);
if (result != null) {
return result;
}
}
// try in .properties of the parent class (without locale)
result = recurseExtractFromParentResource(proxiedClass.getInterfaces(), method, args);
if (result != null) {
return result;
}
result = extractDefaultValue(method, args);
if (result != null) {
return result;
}
throw new GwtTestI18NException(
"Unable to find a Locale specific resource file to bind with i18n interface '"
+ proxiedClass.getName()
+ "' and there is no @DefaultXXXValue annotation on '" + method.getName()
+ "' called method");
}
protected abstract Object extractDefaultValue(Method method, Object[] args) throws Throwable;
protected abstract Object extractFromProperties(Properties localizedProperties, Method method,
Object[] args, Locale locale) throws Throwable;
protected String getKey(Method method) {
Key key = method.getAnnotation(Key.class);
return key != null ? key.value() : method.getName();
}
protected Locale getLocale() {
if (GwtConfig.get().getModuleRunner().getLocale() != null) {
return GwtConfig.get().getModuleRunner().getLocale();
}
DefaultLocale annotation = GwtReflectionUtils.getAnnotation(proxiedClass, DefaultLocale.class);
if (annotation != null) {
String[] localeCodes = annotation.value().split("_");
switch (localeCodes.length) {
case 1:
return new Locale(localeCodes[0]);
case 2:
return new Locale(localeCodes[0], localeCodes[1]);
default:
throw new GwtTestI18NException("Cannot parse Locale value in annoted class ["
+ proxiedClass.getSimpleName() + "] : @"
+ DefaultLocale.class.getSimpleName() + "(" + annotation.value() + ")");
}
} else {
return null;
}
}
private Object extractFromDefaultProperties(Class<?> clazz, Method method, Object[] args)
throws Throwable {
// try to get the value from a .properties without locale
Properties prop = GwtPropertiesHelper.get().getProperties(getPropertiesFilePrefix(clazz));
if (prop != null) {
return extractFromProperties(prop, method, args, getLocale());
} else {
return null;
}
}
private Object extractLocaleSpecificValue(Class<?> localizableResourceClass, Method method,
Object[] args) throws Throwable {
Object result = null;
Locale locale = getLocale();
Properties prop = GwtPropertiesHelper.get().getLocalizedProperties(
getPropertiesFilePrefix(localizableResourceClass), locale);
if (prop != null) {
result = extractFromProperties(prop, method, args, locale);
}
return result;
}
private String getPropertiesFilePrefix(Class<?> localizableResourceClass) {
return localizableResourceClass.getCanonicalName().replaceAll("\\.", "/");
}
private Object recurseExtractFromParentLocaleSpecificResource(Class<?>[] interfaces,
Method method, Object[] args) throws Throwable {
Object result;
for (Class<?> inter : interfaces) {
if (LocalizableResource.class.isAssignableFrom(inter)) {
result = extractLocaleSpecificValue(inter, method, args);
if (result != null) {
return result;
} else {
return recurseExtractFromParentLocaleSpecificResource(inter.getInterfaces(), method,
args);
}
}
}
return null;
}
private Object recurseExtractFromParentResource(Class<?>[] interfaces, Method method,
Object[] args) throws Throwable {
Object result;
for (Class<?> inter : interfaces) {
if (LocalizableResource.class.isAssignableFrom(inter)) {
result = extractFromDefaultProperties(inter, method, args);
if (result != null) {
return result;
} else {
return recurseExtractFromParentResource(inter.getInterfaces(), method, args);
}
}
}
return null;
}
}