package com.epam.wilma.webapp.config.servlet.helper;
/*==========================================================================
Copyright 2013-2017 EPAM Systems
This file is part of Wilma.
Wilma is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Wilma is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Wilma. If not, see <http://www.gnu.org/licenses/>.
===========================================================================*/
import java.io.File;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.nio.file.Path;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import com.epam.wilma.common.stream.helper.FileInputStreamFactory;
/**
* Tries to read a file from a given folder and returns an InputStream, or null if file does not exist.
* @author Tunde_Kovacs
*
*/
@Component
public class FileReader {
private final Logger logger = LoggerFactory.getLogger(FileReader.class);
@Autowired
private FileInputStreamFactory fileInputStreamFactory;
/**
* Reads a message file from the messages folder.
* @param filename name of the file to read
* @param filePath the path of the file
* @return InputStream of file, or null if file doesn't exist.
*/
public InputStream readFile(final String filename, final Path filePath) {
File requestedFile = getFile(filename, filePath);
InputStream fileInputStream = null;
if (requestedFile.isFile()) {
if (requestedFile.exists()) {
try {
fileInputStream = fileInputStreamFactory.createFileInputStream(requestedFile);
} catch (FileNotFoundException e) {
logger.warn("Message file not found!", e);
}
}
}
return fileInputStream;
}
private File getFile(final String filename, final Path filePath) {
Path messageFilePath = filePath.resolve(filename);
return messageFilePath.toFile();
}
}