org.apache.solr.util.FileUtils Maven / Gradle / Ivy
package org.apache.solr.util;
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
import java.io.*;
import java.nio.channels.FileChannel;
/**
*
*/
public class FileUtils {
/**
* Resolves a path relative a base directory.
*
*
* This method does what "new File(base,path)" Should do, if it wasn't
* completely lame: If path is absolute, then a File for that path is returned;
* if it's not absolute, then a File is returned using "path" as a child
* of "base")
*
*/
public static File resolvePath(File base, String path) {
File r = new File(path);
return r.isAbsolute() ? r : new File(base, path);
}
public static void copyFile(File src , File destination) throws IOException {
FileChannel in = null;
FileChannel out = null;
try {
in = new FileInputStream(src).getChannel();
out = new FileOutputStream(destination).getChannel();
in.transferTo(0, in.size(), out);
} finally {
try { if (in != null) in.close(); } catch (IOException e) {}
try { if (out != null) out.close(); } catch (IOException e) {}
}
}
/**
* Copied from Lucene's FSDirectory.fsync(String)
*
* @param fullFile the File to be synced to disk
* @throws IOException if the file could not be synced
*/
public static void sync(File fullFile) throws IOException {
if (fullFile == null || !fullFile.exists())
throw new FileNotFoundException("File does not exist " + fullFile);
boolean success = false;
int retryCount = 0;
IOException exc = null;
while(!success && retryCount < 5) {
retryCount++;
RandomAccessFile file = null;
try {
try {
file = new RandomAccessFile(fullFile, "rw");
file.getFD().sync();
success = true;
} finally {
if (file != null)
file.close();
}
} catch (IOException ioe) {
if (exc == null)
exc = ioe;
try {
// Pause 5 msec
Thread.sleep(5);
} catch (InterruptedException ie) {
Thread.currentThread().interrupt();
}
}
}
if (!success)
// Throw original exception
throw exc;
}
}