/*
* Copyright 2004-2015 the Seasar Foundation and the Others.
*
* 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 org.seasar.framework.message;
import java.net.URL;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import org.seasar.framework.exception.ResourceNotFoundRuntimeException;
import org.seasar.framework.util.AssertionUtil;
import org.seasar.framework.util.Disposable;
import org.seasar.framework.util.DisposableUtil;
import org.seasar.framework.util.ResourceUtil;
/**
* {@link MessageResourceBundle}を取得するためのクラスです。
*
* @author shot
*/
public class MessageResourceBundleFactory {
private static final String PROPERTIES_EXT = ".properties";
private static final Object NOT_FOUND = new Object();
private static Map cache = new HashMap();
private static boolean initialized = false;
/**
* {@link MessageResourceBundle}を返します。
*
* @param baseName
* @return {@link MessageResourceBundle}
* @see #getBundle(String, Locale)
*/
public static MessageResourceBundle getBundle(String baseName) {
return getBundle(baseName, Locale.getDefault());
}
/**
* {@link MessageResourceBundle}を返します。
*
* @param baseName
* @param locale
* @return {@link MessageResourceBundle}
* @throws ResourceNotFoundRuntimeException
* リソースが見つからなかった場合
*/
public static MessageResourceBundle getBundle(String baseName, Locale locale)
throws ResourceNotFoundRuntimeException {
MessageResourceBundle bundle = getNullableBundle(baseName, locale);
if (bundle != null) {
return bundle;
}
throw new ResourceNotFoundRuntimeException(baseName);
}
/**
* {@link MessageResourceBundle}を返します。 リソースが見つからなかった場合は、 nullを返します。
*
* @param baseName
* @return {@link MessageResourceBundle}
* @see #getNullableBundle(String, Locale)
*/
public static MessageResourceBundle getNullableBundle(String baseName) {
return getNullableBundle(baseName, Locale.getDefault());
}
/**
* {@link MessageResourceBundle}を返します。 リソースが見つからなかった場合は、 nullを返します。
*
* @param baseName
* @param locale
* @return {@link MessageResourceBundle}
*/
public static MessageResourceBundle getNullableBundle(String baseName,
Locale locale) {
AssertionUtil.assertNotNull("baseName", baseName);
AssertionUtil.assertNotNull("locale", locale);
String base = baseName.replace('.', '/');
String[] bundleNames = calcurateBundleNames(base, locale);
MessageResourceBundleFacade parentFacade = null;
MessageResourceBundleFacade facade = null;
int length = bundleNames.length;
for (int i = 0; i < length; ++i) {
facade = loadFacade(bundleNames[i] + PROPERTIES_EXT);
if (parentFacade == null) {
parentFacade = facade;
} else if (facade != null) {
facade.setParent(parentFacade);
parentFacade = facade;
}
}
if (parentFacade != null) {
return parentFacade.getBundle();
} else {
return null;
}
}
/**
* メッセージリソースバンドルファザードを返します。
*
* @param path
* パス
* @return メッセージリソースバンドルファザード
*/
protected static MessageResourceBundleFacade loadFacade(String path) {
synchronized (cache) {
if (!initialized) {
DisposableUtil.add(new Disposable() {
public void dispose() {
clear();
initialized = false;
}
});
initialized = true;
}
Object cachedFacade = cache.get(path);
if (cachedFacade == NOT_FOUND) {
return null;
} else if (cachedFacade != null) {
return (MessageResourceBundleFacade) cachedFacade;
}
URL url = ResourceUtil.getResourceNoException(path);
if (url != null) {
MessageResourceBundleFacade facade = new MessageResourceBundleFacade(
url);
cache.put(path, facade);
return facade;
} else {
cache.put(path, NOT_FOUND);
}
}
return null;
}
/**
* リソースバンドル名の配列をロケールから求めて返します。
*
* @param baseName
* リソースバンドルの基底名
* @param locale
* リソースバンドルが必要なロケール
* @return リソースバンドル名配列
*/
protected static String[] calcurateBundleNames(String baseName,
Locale locale) {
int length = 1;
boolean l = locale.getLanguage().length() > 0;
if (l) {
length++;
}
boolean c = locale.getCountry().length() > 0;
if (c) {
length++;
}
boolean v = locale.getVariant().length() > 0;
if (v) {
length++;
}
String[] result = new String[length];
int index = 0;
result[index++] = baseName;
if (!(l || c || v)) {
return result;
}
StringBuffer buffer = new StringBuffer(baseName);
buffer.append('_');
buffer.append(locale.getLanguage());
if (l) {
result[index++] = new String(buffer);
}
if (!(c || v)) {
return result;
}
buffer.append('_');
buffer.append(locale.getCountry());
if (c) {
result[index++] = new String(buffer);
}
if (!v) {
return result;
}
buffer.append('_');
buffer.append(locale.getVariant());
result[index++] = new String(buffer);
return result;
}
/**
* キャッシュしている内容をクリアします。
*/
public static void clear() {
cache.clear();
}
}