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/**
* Copyright 2017 ZTE Corporation.
*
* 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.openo.baseservice.i18n;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Locale;
import java.util.Set;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
final class I18nJsonUtil {
private static I18nJsonUtil util;
private static Lock lock = new ReentrantLock();
private ObjectMapper objectMapper;
public I18nJsonUtil(ObjectMapper objectMapper) {
this.objectMapper = objectMapper;
}
<T extends Object> T readFromJson(InputStream ins, Class<T> clazz)
throws JsonParseException, JsonMappingException, IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] bs = new byte[1024 * 10];
int length = -1;
while ((length = ins.read(bs)) > 0) {
baos.write(bs, 0, length);
}
bs = baos.toByteArray();
byte[] ubs = null;
if (bs.length > 3) {
// 删除bom头 -17, -69, -65
if (bs[0] == -17 && bs[1] == -69 && bs[2] == -65) {
ubs = new byte[bs.length - 3];
System.arraycopy(bs, 3, ubs, 0, ubs.length);
}
}
if (ubs == null) {
ubs = bs;
}
return objectMapper.readValue(ubs, clazz);
}
<T extends Object> T readFromJson(String str, Class<T> clazz)
throws JsonParseException, JsonMappingException, IOException {
return objectMapper.readValue(str, clazz);
}
String writeToJson(Object obj) throws JsonProcessingException {
return objectMapper.writeValueAsString(obj);
}
static I18nJsonUtil getInstance(ObjectMapper objectMapper) {
if (util == null) {
lock.lock();
try {
if (util == null) {
if (objectMapper == null) {
objectMapper = new ObjectMapper();
}
util = new I18nJsonUtil(objectMapper);
}
} finally {
lock.unlock();
}
}
return util;
}
static I18nJsonUtil getInstance() {
return getInstance(null);
}
}
/**
* 国际化转换工具
*
* @author 10163976
*/
class I18nLocaleTransfer {
private static Logger LOG = LoggerFactory.getLogger(I18nLocaleTransfer.class);
/**
* 方言转换<br> 如果存在直接返回<br> 如果不存在，则获取语言进行模糊匹配，未匹配上则返回默认方言<br>
*
* @param theLocale 待转换方言
* @param locales 存在的方言
* @return 转换后的方言
*/
public static String transfer(Locale theLocale, Set<String> locales) {
if (locales == null || locales.isEmpty()) {
LOG.debug("locales is NULL or empty");
return null;
}
if (theLocale == null) {
String result = fetchDefault(locales);
LOG.debug("transfer NULL --> " + result + " in " + locales);
return result;
}
String locale = theLocale.toString();
if (locale.isEmpty()) {
String result = fetchDefault(locales);
LOG.debug("transfer EMPTY --> " + result + " in " + locales);
return result;
}
// 精确匹配
if (locales.contains(locale)) {
return locale;
}
// 根据语言模糊匹配
String language = theLocale.getLanguage();
if (locales.contains(language)) {
LOG.debug("transfer " + locale + " --> " + language + " in " + locales);
return language;
}
language = language + "_";
for (String temp : locales) {
if (temp.startsWith(language)) {
LOG.debug("transfer " + locale + " --> " + temp + " in " + locales);
return temp;
}
}
String result = fetchDefault(locales);
LOG.debug("transfer " + locale + " --> " + result + " in " + locales);
return result;
}
/**
* 返回默认方言，优先级为en,en_US,zh,zh_CN，如果都不存在，则随机返回一个
*/
private static String fetchDefault(Set<String> locales) {
if (locales.contains("en")) {
return "en";
} else if (locales.contains("en_US")) {
return "en_US";
}
if (locales.contains("zh")) {
return "zh";
} else if (locales.contains("zh_CN")) {
return "zh_CN";
}
return locales.iterator().next();
}
}
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