net.lightbody.bmp.proxy.jetty.util.FileResource Maven / Gradle / Ivy
// ========================================================================
// $Id: FileResource.java,v 1.31 2006/01/04 13:55:31 gregwilkins Exp $
// Copyright 1996-2004 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// 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 net.lightbody.bmp.proxy.jetty.util;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URI;
import java.net.URL;
import java.net.URLConnection;
import java.security.Permission;
/**
* File Resource.
*
* Handle resources of implied or explicit file type.
* This class can check for aliasing in the filesystem (eg case insensitivity). By default this is turned on
* if the platform does not have the "/" path separator, or it can be controlled with the
* "org.mortbay.util.FileResource.checkAliases" system parameter.
*
* If alias checking is turned on, then aliased resources are treated as if they do not exist, nor can they be created.
*
* @author Greg Wilkins (gregw)
* @version $Revision: 1.31 $
*/
public class FileResource extends URLResource {
private static final Logger log = LoggerFactory.getLogger(FileResource.class);
private File _file;
private transient URL _alias = null;
private transient boolean _aliasChecked = false;
FileResource(URL url) throws IOException {
super(url, null);
try {
// Try standard API to convert URL to file.
_file = new File(new URI(url.toString()));
} catch (Exception e) {
try {
// Assume that File.toURL produced unencoded chars. So try encoding them.
String urls = "file:" + net.lightbody.bmp.proxy.jetty.util.URI.encodePath(url.toString().substring(5));
_file = new File(new URI(urls));
} catch (Exception e2) {
// Still can't get the file. Doh! try good old hack!
checkConnection();
Permission perm = _connection.getPermission();
_file = new File(perm == null ? url.getFile() : perm.getName());
}
}
if (_file.isDirectory() && !_urlString.endsWith("/")) {
_urlString = _urlString + "/";
}
}
FileResource(URL url, URLConnection connection, File file) {
super(url, connection);
_file = file;
if (_file.isDirectory() && !_urlString.endsWith("/")) {
_urlString = _urlString + "/";
}
}
public Resource addPath(String path) throws IOException {
FileResource r;
if (!isDirectory()) {
r = (FileResource) super.addPath(path);
} else {
path = net.lightbody.bmp.proxy.jetty.util.URI.canonicalPath(path);
// treat all paths being added as relative
String rel = path;
if (path.startsWith("/")) {
rel = path.substring(1);
}
File newFile = new File(_file, rel.replace('/', File.separatorChar));
r = new FileResource(newFile.toURI().toURL(), null, newFile);
}
String encoded = net.lightbody.bmp.proxy.jetty.util.URI.encodePath(path);
int expected = r._urlString.length() - encoded.length();
int index = r._urlString.lastIndexOf(encoded, expected);
if (expected != index && ((expected - 1) != index || path.endsWith("/") || !r.isDirectory())) {
r._alias = r._url;
r._aliasChecked = true;
}
return r;
}
public URL getAlias() {
if (!_aliasChecked) {
try {
String abs = _file.getAbsolutePath();
String can = _file.getCanonicalPath();
if (abs.length() != can.length() || !abs.equals(can)) {
_alias = new File(can).toURI().toURL();
}
_aliasChecked = true;
if (_alias != null) {
log.debug("ALIAS abs={}", abs);
log.debug("ALIAS can={}", can);
}
} catch (Exception e) {
log.warn("ALIAS Exception", e);
return getURL();
}
}
return _alias;
}
/**
* Returns true if the resource exists.
*/
public boolean exists() {
return _file.exists();
}
/**
* Returns the last modified time
*/
public long lastModified() {
return _file.lastModified();
}
/**
* Returns true if the represented resource is a container/directory.
*/
public boolean isDirectory() {
return _file.isDirectory();
}
/**
* Return the length of the resource.
*/
public long length() {
return _file.length();
}
/**
* Returns the name of the resource.
*/
public String getName() {
return _file.getAbsolutePath();
}
/**
* Returns an File representing the given resource or NULL if this is not possible.
*/
public File getFile() {
return _file;
}
/**
* Returns an input stream to the resource.
*/
public InputStream getInputStream() throws IOException {
return new FileInputStream(_file);
}
/**
* Returns an output stream to the resource.
*/
public OutputStream getOutputStream() throws java.io.IOException, SecurityException {
return new FileOutputStream(_file);
}
/**
* Deletes the given resource.
*/
public boolean delete() throws SecurityException {
return _file.delete();
}
/**
* Rename the given resource.
*/
public boolean renameTo(Resource dest) throws SecurityException {
if (dest instanceof FileResource) {
return _file.renameTo(((FileResource) dest)._file);
} else {
return false;
}
}
/**
* Returns a list of resources contained in the given resource.
*/
public String[] list() {
String[] list = _file.list();
if (list == null) {
return null;
}
for (int i = list.length; i-- > 0; ) {
if (new File(_file, list[i]).isDirectory() && !list[i].endsWith("/")) {
list[i] += "/";
}
}
return list;
}
/**
* Encode according to this resource type. File URIs are encoded.
*
* @param uri URI to encode.
* @return The uri unchanged.
*/
public String encode(String uri) {
return uri;
}
/**
* @param o
* @return
*/
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (!(o instanceof FileResource)) {
return false;
}
FileResource f = (FileResource) o;
return f._file == _file || (null != _file && _file.equals(f._file));
}
/**
* @return the hashcode.
*/
public int hashCode() {
return null == _file ? super.hashCode() : _file.hashCode();
}
}