cn.afterturn.easypoi.cache.manager.POICacheManager Maven / Gradle / Ivy
/**
* Copyright 2013-2015 JueYue ([email protected])
*
* 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 cn.afterturn.easypoi.cache.manager;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.util.Arrays;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* 缓存管理
*
* @author JueYue
* 2014年2月10日
* 2015年10月17日
* @version 1.1
*/
public final class POICacheManager {
private static final Logger LOGGER = LoggerFactory
.getLogger(POICacheManager.class);
private static IFileLoader fileLoader = new FileLoaderImpl();
private static ThreadLocal LOCAL_FILE_LOADER = new ThreadLocal();
public static InputStream getFile(String id) {
try {
byte[] result;
//复杂数据,防止操作原数据
if (LOCAL_FILE_LOADER.get() != null) {
result = LOCAL_FILE_LOADER.get().getFile(id);
}
result = fileLoader.getFile(id);
result = Arrays.copyOf(result, result.length);
return new ByteArrayInputStream(result);
} catch (Exception e) {
LOGGER.error(e.getMessage(), e);
}
return null;
}
public static void setFileLoader(IFileLoader fileLoader) {
POICacheManager.fileLoader = fileLoader;
}
/**
* 一次线程有效
* @param fileLoader
*/
public static void setFileLoaderOnce(IFileLoader fileLoader) {
if (fileLoader != null) {
LOCAL_FILE_LOADER.set(fileLoader);
}
}
}