/*
* 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 WARRANTIESOR 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.aries.util.filesystem.impl;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.zip.ZipFile;
import java.util.zip.ZipInputStream;
import org.apache.aries.util.filesystem.ICloseableDirectory;
import org.apache.aries.util.filesystem.IDirectory;
import org.apache.aries.util.filesystem.IFile;
import org.apache.aries.util.io.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class FileSystemImpl {
private static final Logger _logger = LoggerFactory.getLogger(FileSystemImpl.class.getName());
/**
* This method gets the IDirectory that represents the root of a virtual file
* system. The provided file can either identify a directory, or a zip file.
*
* @param fs the zip file.
* @return the root of the virtual FS.
*/
public static IDirectory getFSRoot(File fs, IDirectory parent)
{
IDirectory dir = null;
if (fs.exists()) {
if (fs.isDirectory()) {
dir = new DirectoryImpl(fs, fs);
} else if (fs.isFile() && isValidZip(fs)) {
try {
dir = new ZipDirectory(fs, parent);
} catch (IOException e) {
_logger.error ("IOException in IDirectory.getFSRoot", e);
}
}
}
else {
// since this method does not throw an exception but just returns null, make sure we do not lose the error
_logger.error("File not found in IDirectory.getFSRoot", new FileNotFoundException(fs.getPath()));
}
return dir;
}
/**
* Check whether a file is actually a valid zip
* @param zip
* @return
*/
public static boolean isValidZip(File zip) {
try {
ZipFile zf = new ZipFile(zip);
zf.close();
return true;
} catch (IOException e) {
_logger.debug("Not a valid zip: "+zip);
return false;
}
}
/**
* Check whether a file is actually a valid zip
* @param zip
* @return
*/
public static boolean isValidZip(IFile zip) {
ZipInputStream zis = null;
try {
// just opening the stream ain't enough, we have to check the first entry
zis = new ZipInputStream(zip.open());
return zis.getNextEntry() != null;
} catch (IOException e) {
_logger.debug("Not a valid zip: "+zip);
return false;
} finally {
IOUtils.close(zis);
}
}
public static ICloseableDirectory getFSRoot(InputStream is) {
File tempFile = null;
try {
tempFile = File.createTempFile("inputStreamExtract", ".zip");
} catch (IOException e1) {
_logger.error ("IOException in IDirectory.getFSRoot", e1);
return null;
}
FileOutputStream fos = null;
try {
fos = new FileOutputStream(tempFile);
IOUtils.copy(is, fos);
} catch (IOException e) {
return null;
} finally {
IOUtils.close(fos);
}
IDirectory dir = getFSRoot(tempFile, null);
if(dir == null)
return null;
else
return new InputStreamClosableDirectory(dir, tempFile);
}
}