org.apache.karaf.tooling.utils.IoUtils Maven / Gradle / Ivy
/**
* 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.
*/
package org.apache.karaf.tooling.utils;
import java.io.*;
import java.nio.channels.FileChannel;
public class IoUtils {
private static final long FILE_COPY_BUFFER_SIZE = 1024 * 30;
public static void deleteRecursive(File file) {
if (file != null) {
if (file.isDirectory()) {
File[] children = file.listFiles();
if (children != null) {
for (File child : children) {
deleteRecursive(child);
}
}
}
file.delete();
}
}
public static void copyDirectory(final File srcDir, final File destDir) throws IOException {
if (srcDir == null || !srcDir.exists())
return;
if (destDir == null || !destDir.exists())
destDir.mkdirs();
// recurse
final File[] srcFiles = srcDir.listFiles();
if (srcFiles == null) { // null if abstract pathname does not denote a directory, or if an I/O error occurs
throw new IOException("Failed to list contents of " + srcDir);
}
if (destDir.exists()) {
if (destDir.isDirectory() == false) {
throw new IOException("Destination '" + destDir + "' exists but is not a directory");
}
} else {
if (!destDir.mkdirs() && !destDir.isDirectory()) {
throw new IOException("Destination '" + destDir + "' directory cannot be created");
}
}
if (destDir.canWrite() == false) {
throw new IOException("Destination '" + destDir + "' cannot be written to");
}
for (final File srcFile : srcFiles) {
final File dstFile = new File(destDir, srcFile.getName());
if (srcFile.isDirectory()) {
copyDirectory(srcFile, dstFile);
} else {
copyFile(srcFile, dstFile);
}
}
}
public static void copyFile(final File srcFile, final File destFile) throws IOException {
if (destFile.exists() && destFile.isDirectory()) {
throw new IOException("Destination '" + destFile + "' exists but is a directory");
}
try (FileInputStream fis = new FileInputStream(srcFile);
FileOutputStream fos = new FileOutputStream(destFile);
FileChannel input = fis.getChannel();
FileChannel output = fos.getChannel()) {
final long size = input.size(); // TODO See IO-386
long pos = 0;
long count = 0;
while (pos < size) {
final long remain = size - pos;
count = remain > FILE_COPY_BUFFER_SIZE ? FILE_COPY_BUFFER_SIZE : remain;
final long bytesCopied = output.transferFrom(input, pos, count);
if (bytesCopied == 0) { // IO-385 - can happen if file is truncated after caching the size
break; // ensure we don't loop forever
}
pos += bytesCopied;
}
}
final long srcLen = srcFile.length(); // TODO See IO-386
final long dstLen = destFile.length(); // TODO See IO-386
if (srcLen != dstLen) {
throw new IOException("Failed to copy full contents from '" +
srcFile + "' to '" + destFile + "' Expected length: " + srcLen +" Actual: " + dstLen);
}
}
}