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Tools to assist in the reading of configuration/preferences files in
various formats
/*
* 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.commons.configuration2.io;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.reflect.Method;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLStreamHandler;
import java.util.Map;
import org.apache.commons.configuration2.ex.ConfigurationException;
import org.apache.commons.configuration2.ex.ConfigurationRuntimeException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.commons.vfs2.FileContent;
import org.apache.commons.vfs2.FileName;
import org.apache.commons.vfs2.FileObject;
import org.apache.commons.vfs2.FileSystemConfigBuilder;
import org.apache.commons.vfs2.FileSystemException;
import org.apache.commons.vfs2.FileSystemManager;
import org.apache.commons.vfs2.FileSystemOptions;
import org.apache.commons.vfs2.FileType;
import org.apache.commons.vfs2.VFS;
import org.apache.commons.vfs2.provider.UriParser;
/**
* FileSystem that uses Commons VFS
* @since 1.7
*/
public class VFSFileSystem extends DefaultFileSystem
{
/** The logger. */
private final Log log = LogFactory.getLog(getClass());
public VFSFileSystem()
{
}
@Override
public InputStream getInputStream(final URL url) throws ConfigurationException
{
FileObject file;
try
{
final FileSystemOptions opts = getOptions(url.getProtocol());
file = opts == null ? VFS.getManager().resolveFile(url.toString())
: VFS.getManager().resolveFile(url.toString(), opts);
if (file.getType() != FileType.FILE)
{
throw new ConfigurationException("Cannot load a configuration from a directory");
}
final FileContent content = file.getContent();
if (content == null)
{
final String msg = "Cannot access content of " + file.getName().getFriendlyURI();
throw new ConfigurationException(msg);
}
return content.getInputStream();
}
catch (final FileSystemException fse)
{
final String msg = "Unable to access " + url.toString();
throw new ConfigurationException(msg, fse);
}
}
@Override
public OutputStream getOutputStream(final URL url) throws ConfigurationException
{
try
{
final FileSystemOptions opts = getOptions(url.getProtocol());
final FileSystemManager fsManager = VFS.getManager();
final FileObject file = opts == null ? fsManager.resolveFile(url.toString())
: fsManager.resolveFile(url.toString(), opts);
// throw an exception if the target URL is a directory
if (file == null || file.getType() == FileType.FOLDER)
{
throw new ConfigurationException("Cannot save a configuration to a directory");
}
final FileContent content = file.getContent();
if (content == null)
{
throw new ConfigurationException("Cannot access content of " + url);
}
return content.getOutputStream();
}
catch (final FileSystemException fse)
{
throw new ConfigurationException("Unable to access " + url, fse);
}
}
@Override
public String getPath(final File file, final URL url, final String basePath, final String fileName)
{
if (file != null)
{
return super.getPath(file, url, basePath, fileName);
}
try
{
final FileSystemManager fsManager = VFS.getManager();
if (url != null)
{
final FileName name = fsManager.resolveURI(url.toString());
if (name != null)
{
return name.toString();
}
}
if (UriParser.extractScheme(fileName) != null)
{
return fileName;
}
else if (basePath != null)
{
final FileName base = fsManager.resolveURI(basePath);
return fsManager.resolveName(base, fileName).getURI();
}
else
{
final FileName name = fsManager.resolveURI(fileName);
final FileName base = name.getParent();
return fsManager.resolveName(base, name.getBaseName()).getURI();
}
}
catch (final FileSystemException fse)
{
fse.printStackTrace();
return null;
}
}
@Override
public String getBasePath(final String path)
{
if (UriParser.extractScheme(path) == null)
{
return super.getBasePath(path);
}
try
{
final FileSystemManager fsManager = VFS.getManager();
final FileName name = fsManager.resolveURI(path);
return name.getParent().getURI();
}
catch (final FileSystemException fse)
{
fse.printStackTrace();
return null;
}
}
@Override
public String getFileName(final String path)
{
if (UriParser.extractScheme(path) == null)
{
return super.getFileName(path);
}
try
{
final FileSystemManager fsManager = VFS.getManager();
final FileName name = fsManager.resolveURI(path);
return name.getBaseName();
}
catch (final FileSystemException fse)
{
fse.printStackTrace();
return null;
}
}
@Override
public URL getURL(final String basePath, final String file) throws MalformedURLException
{
if ((basePath != null && UriParser.extractScheme(basePath) == null)
|| (basePath == null && UriParser.extractScheme(file) == null))
{
return super.getURL(basePath, file);
}
try
{
final FileSystemManager fsManager = VFS.getManager();
FileName path;
if (basePath != null && UriParser.extractScheme(file) == null)
{
final FileName base = fsManager.resolveURI(basePath);
path = fsManager.resolveName(base, file);
}
else
{
path = fsManager.resolveURI(file);
}
final URLStreamHandler handler = new VFSURLStreamHandler(path);
return new URL(null, path.getURI(), handler);
}
catch (final FileSystemException fse)
{
throw new ConfigurationRuntimeException("Could not parse basePath: " + basePath
+ " and fileName: " + file, fse);
}
}
@Override
public URL locateFromURL(final String basePath, final String fileName)
{
final String fileScheme = UriParser.extractScheme(fileName);
// Use DefaultFileSystem if basePath and fileName don't have a scheme.
if ((basePath == null || UriParser.extractScheme(basePath) == null) && fileScheme == null)
{
return super.locateFromURL(basePath, fileName);
}
try
{
final FileSystemManager fsManager = VFS.getManager();
FileObject file;
// Only use the base path if the file name doesn't have a scheme.
if (basePath != null && fileScheme == null)
{
final String scheme = UriParser.extractScheme(basePath);
final FileSystemOptions opts = scheme != null ? getOptions(scheme) : null;
FileObject base = opts == null ? fsManager.resolveFile(basePath)
: fsManager.resolveFile(basePath, opts);
if (base.getType() == FileType.FILE)
{
base = base.getParent();
}
file = fsManager.resolveFile(base, fileName);
}
else
{
final FileSystemOptions opts = fileScheme != null ? getOptions(fileScheme) : null;
file = opts == null ? fsManager.resolveFile(fileName)
: fsManager.resolveFile(fileName, opts);
}
if (!file.exists())
{
return null;
}
final FileName path = file.getName();
final URLStreamHandler handler = new VFSURLStreamHandler(path);
return new URL(null, path.getURI(), handler);
}
catch (final FileSystemException fse)
{
return null;
}
catch (final MalformedURLException ex)
{
return null;
}
}
private FileSystemOptions getOptions(final String scheme)
{
final FileSystemOptions opts = new FileSystemOptions();
FileSystemConfigBuilder builder;
try
{
builder = VFS.getManager().getFileSystemConfigBuilder(scheme);
}
catch (final Exception ex)
{
return null;
}
final FileOptionsProvider provider = getFileOptionsProvider();
if (provider != null)
{
final Map map = provider.getOptions();
if (map == null)
{
return null;
}
int count = 0;
for (final Map.Entry entry : map.entrySet())
{
try
{
String key = entry.getKey();
if (FileOptionsProvider.CURRENT_USER.equals(key))
{
key = "creatorName";
}
setProperty(builder, opts, key, entry.getValue());
++count;
}
catch (final Exception ex)
{
// Ignore an incorrect property.
continue;
}
}
if (count > 0)
{
return opts;
}
}
return null;
}
private void setProperty(final FileSystemConfigBuilder builder, final FileSystemOptions options,
final String key, final Object value)
{
final String methodName = "set" + key.substring(0, 1).toUpperCase() + key.substring(1);
final Class[] paramTypes = new Class[2];
paramTypes[0] = FileSystemOptions.class;
paramTypes[1] = value.getClass();
try
{
final Method method = builder.getClass().getMethod(methodName, paramTypes);
final Object[] params = new Object[2];
params[0] = options;
params[1] = value;
method.invoke(builder, params);
}
catch (final Exception ex)
{
log.warn("Cannot access property '" + key + "'! Ignoring.", ex);
}
}
/**
* Stream handler required to create URL.
*/
private static class VFSURLStreamHandler extends URLStreamHandler
{
/** The Protocol used */
private final String protocol;
public VFSURLStreamHandler(final FileName file)
{
this.protocol = file.getScheme();
}
@Override
protected URLConnection openConnection(final URL url) throws IOException
{
throw new IOException("VFS URLs can only be used with VFS APIs");
}
}
}