/*
    * 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.vfs2.impl;
  
  import java.io.File;
  import java.lang.reflect.Constructor;
  import java.net.URI;
  import java.net.URISyntaxException;
  import java.net.URL;
  import java.net.URLStreamHandler;
  import java.net.URLStreamHandlerFactory;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.Collection;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.apache.commons.vfs2.CacheStrategy;
  import org.apache.commons.vfs2.Capability;
  import org.apache.commons.vfs2.FileContentInfoFactory;
  import org.apache.commons.vfs2.FileName;
  import org.apache.commons.vfs2.FileObject;
  import org.apache.commons.vfs2.FileSystem;
  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.FilesCache;
  import org.apache.commons.vfs2.NameScope;
  import org.apache.commons.vfs2.VFS;
  import org.apache.commons.vfs2.cache.SoftRefFilesCache;
  import org.apache.commons.vfs2.operations.FileOperationProvider;
  import org.apache.commons.vfs2.provider.AbstractFileName;
  import org.apache.commons.vfs2.provider.AbstractFileProvider;
  import org.apache.commons.vfs2.provider.DefaultURLStreamHandler;
  import org.apache.commons.vfs2.provider.FileProvider;
  import org.apache.commons.vfs2.provider.FileReplicator;
  import org.apache.commons.vfs2.provider.LocalFileProvider;
  import org.apache.commons.vfs2.provider.TemporaryFileStore;
  import org.apache.commons.vfs2.provider.UriParser;
  import org.apache.commons.vfs2.provider.VfsComponent;
  
  /**
   * The default file system manager implementation.
   */
  public class DefaultFileSystemManager implements FileSystemManager {
  
      /**
       * This is an internal class because it needs access to the private member providers.
       */
      final class VfsStreamHandlerFactory implements URLStreamHandlerFactory {
          @Override
          public URLStreamHandler createURLStreamHandler(final String protocol) {
              final FileProvider provider = providers.get(protocol);
              if (provider != null) {
                  return new DefaultURLStreamHandler(context);
              }
  
              // Route all other calls to the default URLStreamHandlerFactory
              return new URLStreamHandlerProxy();
          }
      }
  
      /**
       * Mapping from URI scheme to FileProvider.
       */
      private final Map<String, FileProvider> providers = new HashMap<>();
  
      /**
       * List of the schemes of virtual file systems added.
       */
      private final List<String> virtualFileSystemSchemes = new ArrayList<>();
  
      /**
       * All components used by this manager.
       */
      private final ArrayList<Object> components = new ArrayList<>();
  
      /**
       * The context to pass to providers.
       */
     private final DefaultVfsComponentContextntContext.html#DefaultVfsComponentContext">DefaultVfsComponentContext context = new DefaultVfsComponentContext(this);
 
     /**
      * Operations providers added to this manager.
      */
     private final Map<String, List<FileOperationProvider>> operationProviders = new HashMap<>();
 
     /**
      * Mappings of file types.
      */
     private final FileTypeMapleTypeMap.html#FileTypeMap">FileTypeMap typeMap = new FileTypeMap();
 
     /**
      * The provider for local files.
      */
     private LocalFileProvider localFileProvider;
 
     /**
      * The default provider.
      */
     private FileProvider defaultProvider;
 
     /**
      * The file replicator to use.
      */
     private FileReplicator fileReplicator;
 
     /**
      * The base file to use for relative URI.
      */
     private FileObject baseFile;
 
     /**
      * The files cache
      */
     private FilesCache filesCache;
 
     /**
      * The cache strategy
      */
     private CacheStrategy fileCacheStrategy;
     /**
      * Class which decorates all returned fileObjects
      */
     private Class<?> fileObjectDecorator;
 
     /**
      * Reflection constructor extracted from {@link #fileObjectDecorator}
      */
     private Constructor<?> fileObjectDecoratorConst;
 
     /**
      * The class to use to determine the content-type (mime-type)
      */
     private FileContentInfoFactory fileContentInfoFactory;
 
     /**
      * The logger to use. Default implementation.
      */
     private Log log = LogFactory.getLog(getClass());
 
     /**
      * The temporary file store to use.
      */
     private TemporaryFileStore tempFileStore;
 
     /**
      * The virtual file provider.
      */
     private VirtualFileProvider vfsProvider;
 
     /**
      * Flag, if manager is initialized (after init() and before close()).
      */
     private boolean init;
 
     /**
      * Closes the given file system.
      * <p>
      * If you use VFS as singleton it is VERY dangerous to call this method
      * </p>
      *
      * @param fileSystem The FileSystem to close.
      */
     public void _closeFileSystem(final FileSystem fileSystem) {
         final FileProvider provider = providers.get(fileSystem.getRootName().getScheme());
         if (provider != null) {
             ((AbstractFileProvider) provider).closeFileSystem(fileSystem);
         } else if (fileSystem instanceof VirtualFileSystem) {
             // vfsProvider does not implement AbstractFileProvider
             vfsProvider.closeFileSystem(fileSystem);
         }
     }
 
     /**
      * Adds an file name extension mapping.
      *
      * @param extension The file name extension.
      * @param scheme The scheme to use for files with this extension.
      */
     public void addExtensionMap(final String extension, final String scheme) {
         typeMap.addExtension(extension, scheme);
     }
 
     /**
      * Adds a mime type mapping.
      *
      * @param mimeType The mime type.
      * @param scheme The scheme to use for files with this mime type.
      */
     public void addMimeTypeMap(final String mimeType, final String scheme) {
         typeMap.addMimeType(mimeType, scheme);
     }
 
     /**
      * Adds the specified FileOperationProvider for the specified scheme. Several FileOperationProvider's might be
      * registered for the same scheme. For example, for "file" scheme we can register SvnWsOperationProvider and
      * CvsOperationProvider.
      *
      * @param scheme The scheme the provider should be registered for.
      * @param operationProvider The FileOperationProvider.
      * @throws FileSystemException if an error occurs adding the provider.
      */
     @Override
     public void addOperationProvider(final String scheme, final FileOperationProvider operationProvider)
             throws FileSystemException {
         addOperationProvider(new String[] { scheme }, operationProvider);
     }
 
     /**
      * @see FileSystemManager#addOperationProvider(String, org.apache.commons.vfs2.operations.FileOperationProvider)
      *
      * @param schemes The array of schemes the provider should apply to.
      * @param operationProvider The FileOperationProvider.
      * @throws FileSystemException if an error occurs.
      */
     @Override
     public void addOperationProvider(final String[] schemes, final FileOperationProvider operationProvider)
             throws FileSystemException {
         for (final String scheme : schemes) {
             if (!operationProviders.containsKey(scheme)) {
                 final List<FileOperationProvider> providers = new ArrayList<>();
                 operationProviders.put(scheme, providers);
             }
 
             final List<FileOperationProvider> providers = operationProviders.get(scheme);
 
             if (providers.contains(operationProvider)) {
                 throw new FileSystemException("vfs.operation/operation-provider-already-added.error", scheme);
             }
 
             setupComponent(operationProvider);
 
             providers.add(operationProvider);
         }
     }
 
     /**
      * Registers a file system provider.
      * <p>
      * The manager takes care of all lifecycle management. A provider may be registered multiple times. The first
      * {@link LocalFileProvider} added will be remembered for {@link #getLocalFileProvider()}.
      * </p>
      *
      * @param urlScheme The scheme the provider will handle.
      * @param provider The provider.
      * @throws FileSystemException if an error occurs adding the provider.
      */
     public void addProvider(final String urlScheme, final FileProvider provider) throws FileSystemException {
         addProvider(new String[] { urlScheme }, provider);
     }
 
     /**
      * Registers a file system provider.
      * <p>
      * The manager takes care of all lifecycle management. A provider may be registered multiple times. The first
      * {@link LocalFileProvider} added will be remembered for {@link #getLocalFileProvider()}.
      * </p>
      *
      * @param urlSchemes The schemes the provider will handle.
      * @param provider The provider.
      * @throws FileSystemException if an error occurs adding the provider.
      */
     public void addProvider(final String[] urlSchemes, final FileProvider provider) throws FileSystemException {
         // fail duplicate schemes
         for (final String scheme : urlSchemes) {
             if (providers.containsKey(scheme)) {
                 throw new FileSystemException("vfs.impl/multiple-providers-for-scheme.error", scheme);
             }
         }
 
         // Contextualise the component (if not already)
         setupComponent(provider);
 
         // Add to map
         Arrays.stream(urlSchemes).forEach(scheme -> providers.put(scheme, provider));
 
         if (provider instanceof LocalFileProvider && localFileProvider == null) {
             localFileProvider = (LocalFileProvider) provider;
         }
     }
 
     protected void addVirtualFileSystemScheme(String rootUri) {
         if (rootUri.indexOf(':') != -1) {
             rootUri = rootUri.substring(0, rootUri.indexOf(':'));
         }
         virtualFileSystemSchemes.add(rootUri);
     }
 
     /**
      * Determines if a layered file system can be created for a given file.
      *
      * @param file The file to check for.
      * @return true if the FileSystem can be created.
      * @throws FileSystemException if an error occurs.
      */
     @Override
     public boolean canCreateFileSystem(final FileObject file) throws FileSystemException {
         return typeMap.getScheme(file) != null;
     }
 
     /**
      * Closes the manager.
      * <p>
      * This will close all providers (all files), it will also close all managed components including temporary files,
      * replicator, file cache and file operations.
      * </p>
      * <p>
      * The manager is in uninitialized state after this method.
      * </p>
      */
     @Override
     public void close() {
         if (!init) {
             return;
         }
 
         // make sure all discovered components in
         // org.apache.commons.vfs2.impl.StandardFileSystemManager.configure(Element)
         // are closed here
 
         // Close the file system providers.
         providers.values().forEach(this::closeComponent);
 
         // Close the other components
         closeComponent(vfsProvider);
         closeComponent(fileReplicator);
         closeComponent(tempFileStore);
         closeComponent(defaultProvider);
 
         // unregister all providers here, so if any components have local file references
         // they can still resolve against the supported schemes
         providers.clear();
 
         // FileOperations are components, too
         operationProviders.values().forEach(opProviders -> opProviders.forEach(this::closeComponent));
 
         // unregister all
         operationProviders.clear();
 
         // collections with add()
         typeMap.clear();
 
         // Close cache last.
         closeComponent(filesCache);
 
         // should not happen, but make debugging easier:
         if (!components.isEmpty()) {
             log.warn("DefaultFilesystemManager.close: not all components are closed: " + components.toString());
         }
         components.clear();
 
         // managed components
         vfsProvider = null;
 
         // virtual schemas
         virtualFileSystemSchemes.clear();
 
         // setters and derived state
         defaultProvider = null;
         baseFile = null;
         fileObjectDecorator = null;
         fileObjectDecoratorConst = null;
         localFileProvider = null;
         fileReplicator = null;
         tempFileStore = null;
         // setters with init() defaults
         filesCache = null;
         fileCacheStrategy = null;
         fileContentInfoFactory = null;
 
         init = false;
     }
 
     /**
      * Closes a component, if it has not already been closed.
      *
      * @param component The component to close.
      */
     private void closeComponent(final Object component) {
         if (component != null && components.contains(component)) {
             if (component instanceof VfsComponent) {
                 ((VfsComponent) component).close();
             }
             components.remove(component);
         }
     }
 
     /**
      * Closes the given file system.
      * <p>
      * If you use VFS as singleton it is VERY dangerous to call this method.
      * </p>
      *
      * @param fileSystem The FileSystem to close.
      */
     @Override
     public void closeFileSystem(final FileSystem fileSystem) {
         // inform the cache ...
         getFilesCache().clear(fileSystem);
 
         // just in case the cache didnt call _closeFileSystem
         _closeFileSystem(fileSystem);
     }
 
     /**
      * Creates a layered file system.
      *
      * @param file The FileObject to use.
      * @return The layered FileObject.
      * @throws FileSystemException if an error occurs.
      */
     @Override
     public FileObject#FileObject">FileObject createFileSystem(final FileObject file) throws FileSystemException {
         final String scheme = typeMap.getScheme(file);
         FileSystemException.requireNonNull(scheme, "vfs.impl/no-provider-for-file.error", file);
         return createFileSystem(scheme, file);
     }
 
     /**
      * Creates a layered file system.
      *
      * @param scheme The scheme to use.
      * @param file The FileObject.
      * @return The layered FileObject.
      * @throws FileSystemException if an error occurs.
      */
     @Override
     public FileObject createFileSystem(FileObject="jxr_keyword">final String scheme, final FileObject file) throws FileSystemException {
         final FileProvider provider = providers.get(scheme);
         FileSystemException.requireNonNull(provider, "vfs.impl/unknown-provider.error", scheme, file);
         return provider.createFileSystem(scheme, file, file.getFileSystem().getFileSystemOptions());
     }
 
     /**
      * Creates a virtual file system.
      *
      * @param rootFile The FileObject to use.
      * @return The FileObject in the VirtualFileSystem.
      * @throws FileSystemException if an error occurs creating the file.
      */
     @Override
     public FileObjectject">FileObject createVirtualFileSystem(final FileObject rootFile) throws FileSystemException {
         final FileObject fileObject = vfsProvider.createFileSystem(rootFile);
         addVirtualFileSystemScheme(rootFile.getName().getScheme());
         return fileObject;
     }
 
     /**
      * Creates an empty virtual file system.
      *
      * @param rootUri The URI to use as the root of the FileSystem.
      * @return A FileObject in the virtual FileSystem.
      * @throws FileSystemException if an error occurs.
      */
     @Override
     public FileObject createVirtualFileSystem(final String rootUri) throws FileSystemException {
         final FileObject fileObject = vfsProvider.createFileSystem(rootUri);
         addVirtualFileSystemScheme(rootUri);
         return fileObject;
     }
 
     /**
      * Free all resources used by unused file systems created by this manager.
      */
     public void freeUnusedResources() {
         if (!init) {
             return;
         }
 
         // Close the providers.
         for (final FileProvider fileProvider : providers.values()) {
             if (fileProvider instanceof AbstractFileProvider) {
                 ((AbstractFileProvider) fileProvider).freeUnusedResources();
             }
         }
         // vfsProvider does not need to free resources
     }
 
     /**
      * Returns the base file used to resolve relative URI.
      *
      * @return The FileObject that represents the base file.
      * @throws FileSystemException if an error occurs.
      */
     @Override
     public FileObject getBaseFile() throws FileSystemException {
         return baseFile;
     }
 
     /**
      * Get the cache strategy used.
      *
      * @return The CacheStrategy.
      */
     @Override
     public CacheStrategy getCacheStrategy() {
         return fileCacheStrategy;
     }
 
     /**
      * get the fileContentInfoFactory used to determine the infos of a file content.
      *
      * @return The FileContentInfoFactory.
      */
     @Override
     public FileContentInfoFactory getFileContentInfoFactory() {
         return fileContentInfoFactory;
     }
 
     /**
      * Get the file object decorator used.
      *
      * @return The decorator.
      */
     @Override
     public Class<?> getFileObjectDecorator() {
         return fileObjectDecorator;
     }
 
     /**
      * The constructor associated to the fileObjectDecorator. We cache it here for performance reasons.
      *
      * @return The decorator's Constructor.
      */
     @Override
     public Constructor<?> getFileObjectDecoratorConst() {
         return fileObjectDecoratorConst;
     }
 
     /**
      * Returns the filesCache implementation used to cache files.
      *
      * @return The FilesCache.
      */
     @Override
     public FilesCache getFilesCache() {
         return filesCache;
     }
 
     /**
      * Get the configuration builder for the given scheme.
      *
      * @param scheme The scheme to locate.
      * @return The FileSystemConfigBuilder for the scheme.
      * @throws FileSystemException if the given scheme is not konwn
      */
     @Override
     public FileSystemConfigBuilder getFileSystemConfigBuilder(final String scheme) throws FileSystemException {
         final FileProvider provider = providers.get(scheme);
         FileSystemException.requireNonNull(provider, "vfs.impl/unknown-scheme.error", scheme);
         return provider.getConfigBuilder();
     }
 
     /**
      * Locates the local file provider.
      * <p>
      * The local file provider is the first {@linkplain #addProvider(String[], FileProvider) provider added}
      * implementing {@link LocalFileProvider}.
      * </p>
      *
      * @return The LocalFileProvider.
      * @throws FileSystemException if no local file provider was set.
      */
     private LocalFileProvider getLocalFileProvider() throws FileSystemException {
         return FileSystemException.requireNonNull(localFileProvider, "vfs.impl/no-local-file-provider.error");
     }
 
     /**
      * Returns the logger used by this manager.
      *
      * @return the Logger.
      */
     protected Log getLogger() {
         return log;
     }
 
     /**
      * @param scheme the scheme for wich we want to get the list af registered providers.
      *
      * @return the registered FileOperationProviders for the specified scheme. If there were no providers registered for
      *         the scheme, it returns null.
      *
      * @throws FileSystemException if an error occurs.
      */
     @Override
     public FileOperationProvider[] getOperationProviders(final String scheme) throws FileSystemException {
 
         final List<?> providers = operationProviders.get(scheme);
         if (providers == null || providers.isEmpty()) {
             return null;
         }
         return providers.toArray(FileOperationProvider.EMPTY_ARRAY);
     }
 
     /**
      * Get the capabilities for a given scheme.
      *
      * @param scheme The scheme to located.
      * @return A Collection of capabilities.
      * @throws FileSystemException if the given scheme is not konwn
      */
     @Override
     public Collection<Capability> getProviderCapabilities(final String scheme) throws FileSystemException {
         final FileProvider provider = providers.get(scheme);
         FileSystemException.requireNonNull(provider, "vfs.impl/unknown-scheme.error", scheme);
         return provider.getCapabilities();
     }
 
     /**
      * Returns the file replicator.
      *
      * @return The file replicator. Never returns null.
      * @throws FileSystemException if there is no FileReplicator.
      */
     public FileReplicator getReplicator() throws FileSystemException {
         return FileSystemException.requireNonNull(fileReplicator, "vfs.impl/no-replicator.error");
     }
 
     /**
      * Get the schemes currently available.
      *
      * @return The array of scheme names.
      */
     @Override
     public String[] getSchemes() {
         final List<String> schemes = new ArrayList<>(providers.size() + virtualFileSystemSchemes.size());
         schemes.addAll(providers.keySet());
         schemes.addAll(virtualFileSystemSchemes);
         return schemes.toArray(new String[]{});
     }
 
     /**
      * Returns the temporary file store.
      *
      * @return The file store. Never returns null.
      * @throws FileSystemException if there is no TemporaryFileStore.
      */
     public TemporaryFileStore getTemporaryFileStore() throws FileSystemException {
         return FileSystemException.requireNonNull(tempFileStore, "vfs.impl/no-temp-file-store.error");
     }
 
     /**
      * Get the URLStreamHandlerFactory.
      *
      * @return The URLStreamHandlerFactory.
      */
     @Override
     public URLStreamHandlerFactory getURLStreamHandlerFactory() {
         return new VfsStreamHandlerFactory();
     }
 
     /**
      * Returns true if this manager has a provider for a particular scheme.
      *
      * @param scheme The scheme to check.
      * @return true if a provider is configured for this scheme, false otherwise.
      */
     @Override
     public boolean hasProvider(final String scheme) {
         return providers.containsKey(scheme);
     }
 
     /**
      * Initializes this manager.
      * <p>
      * If no value for the following properties was specified, it will use the following defaults:
      * </p>
      * <ul>
      * <li>fileContentInfoFactory = new FileContentInfoFilenameFactory()</li>
      * <li>filesCache = new SoftRefFilesCache()</li>
      * <li>fileCacheStrategy = CacheStrategy.ON_RESOLVE</li>
      * </ul>
      *
      * @throws FileSystemException if an error occurs during initialization.
      */
     public void init() throws FileSystemException {
         if (fileContentInfoFactory == null) {
             fileContentInfoFactory = new FileContentInfoFilenameFactory();
         }
 
         if (filesCache == null) {
             filesCache = new SoftRefFilesCache();
         }
         if (fileCacheStrategy == null) {
             fileCacheStrategy = CacheStrategy.ON_RESOLVE;
         }
         setupComponent(filesCache);
 
         vfsProvider = new VirtualFileProvider();
         setupComponent(vfsProvider);
 
         init = true;
     }
 
     /**
      * Unregisters a file system provider.
      *
      * @param urlScheme The scheme of the provider.
      * @since 2.8.0
      */
     public void removeProvider(final String urlScheme) {
         final FileProvider provider = providers.remove(urlScheme);
         // check whether the same instance is not used somewhere else
         if (provider != null && !providers.containsValue(provider)) {
             closeComponent(provider);
         }
     }
 
     /**
      * Resolves a URI, relative to base file.
      * <p>
      * Uses the {@linkplain #getLocalFileProvider() local file provider} to locate the system file.
      *
      * @param baseFile The base File to use to locate the file.
      * @param uri The URI of the file to locate.
      * @return The FileObject for the located file.
      * @throws FileSystemException if the file cannot be located or an error occurs.
      */
     @Override
     public FileObject resolveFile(final File baseFile, final String uri) throws FileSystemException {
         return resolveFile(getLocalFileProvider().findLocalFile(baseFile), uri);
     }
 
     /**
      * Resolves a URI, relative to a base file.
      *
      * @param baseFile The base FileOjbect to use to locate the file.
      * @param uri The URI of the file to locate.
      * @return The FileObject for the located file.
      * @throws FileSystemException if the file cannot be located or an error occurs.
      */
     @Override
     public FileObject.html#FileObject">FileObject resolveFile(final FileObject baseFile, final String uri) throws FileSystemException {
         return resolveFile(baseFile, uri, baseFile == null ? null : baseFile.getFileSystem().getFileSystemOptions());
     }
 
     /**
      * Resolves a URI, relative to a base file with specified FileSystem configuration.
      *
      * @param baseFile The base file.
      * @param uri The file name. May be a fully qualified or relative path or a url.
      * @param fileSystemOptions Options to pass to the file system.
      * @return A FileObject representing the target file.
      * @throws FileSystemException if an error occurs accessing the file.
      */
     public FileObject.html#FileObject">FileObject resolveFile(final FileObject baseFile, final String uri,
             final FileSystemOptions fileSystemOptions) throws FileSystemException {
         final FileObject realBaseFile;
         if (baseFile != null && VFS.isUriStyle() && baseFile.getName().isFile()) {
             realBaseFile = baseFile.getParent();
         } else {
             realBaseFile = baseFile;
         }
         // TODO: use resolveName and use this name to resolve the fileObject
 
         UriParser.checkUriEncoding(uri);
 
         if (uri == null) {
             throw new IllegalArgumentException();
         }
 
         // Extract the scheme
         final String scheme = UriParser.extractScheme(getSchemes(), uri);
         if (scheme != null) {
             // An absolute URI - locate the provider
             final FileProvider provider = providers.get(scheme);
             if (provider != null) {
                 return provider.findFile(realBaseFile, uri, fileSystemOptions);
             }
             // Otherwise, assume a local file
         }
 
         // Handle absolute file names
         if (localFileProvider != null && localFileProvider.isAbsoluteLocalName(uri)) {
             return localFileProvider.findLocalFile(uri);
         }
 
         if (scheme != null) {
             // An unknown scheme - hand it to the default provider
             FileSystemException.requireNonNull(defaultProvider, "vfs.impl/unknown-scheme.error", scheme, uri);
             return defaultProvider.findFile(realBaseFile, uri, fileSystemOptions);
         }
 
         // Assume a relative name - use the supplied base file
         FileSystemException.requireNonNull(realBaseFile, "vfs.impl/find-rel-file.error", uri);
 
         return realBaseFile.resolveFile(uri);
     }
 
     /**
      * Locates a file by URI.
      *
      * @param uri The URI of the file to locate.
      * @return The FileObject for the located file.
      * @throws FileSystemException if the file cannot be located or an error occurs.
      */
     @Override
     public FileObject resolveFile(final String uri) throws FileSystemException {
         return resolveFile(getBaseFile(), uri);
     }
 
     /**
      * Locate a file by URI, use the FileSystemOptions for file-system creation.
      *
      * @param uri The URI of the file to locate.
      * @param fileSystemOptions The options for the FileSystem.
      * @return The FileObject for the located file.
      * @throws FileSystemException if the file cannot be located or an error occurs.
      */
 
     @Override
     public FileObject resolveFile(final String uri, final FileSystemOptions fileSystemOptions)
             throws FileSystemException {
         // return resolveFile(baseFile, uri, fileSystemOptions);
         return resolveFile(getBaseFile(), uri, fileSystemOptions);
     }
 
     /**
      * Converts a URI into a {@link FileObject}.
      *
      * @param uri The URI to convert.
      * @return The {@link FileObject} that represents the URI. Never returns null.
      * @throws FileSystemException On error converting the URI.
      * @since 2.1
      */
     @Override
     public FileObject resolveFile(final URI uri) throws FileSystemException {
         // TODO Push the URI deeper into VFS
         return resolveFile(baseFile, uri.toString(), null);
     }
 
     /**
      * Converts a URL into a {@link FileObject}.
      *
      * @param url The URL to convert.
      * @return The {@link FileObject} that represents the URL. Never returns null.
      * @throws FileSystemException On error converting the URL.
      * @since 2.1
      */
     @Override
     public FileObject resolveFile(final URL url) throws FileSystemException {
         try {
             return this.resolveFile(url.toURI());
         } catch (final URISyntaxException e) {
             throw new FileSystemException(e);
         }
     }
 
     /**
      * Resolves a name, relative to the file. If the supplied name is an absolute path, then it is resolved relative to
      * the root of the file system that the file belongs to. If a relative name is supplied, then it is resolved
      * relative to this file name.
      *
      * @param root The base FileName.
      * @param path The path to the file relative to the base FileName or an absolute path.
      * @return The constructed FileName.
      * @throws FileSystemException if an error occurs constructing the FileName.
      */
     @Override
     public FileName.html#FileName">FileName resolveName(final FileName root, final String path) throws FileSystemException {
         return resolveName(root, path, NameScope.FILE_SYSTEM);
     }
 
 
     /**
      * Resolves a name, relative to the root.
      *
      * @param base the base file name
      * @param name the name
      * @param scope the {@link NameScope}
      * @return The FileName of the file.
      * @throws FileSystemException if an error occurs.
      */
     @Override
     public FileName.html#FileName">FileName resolveName(final FileName base, final String name, final NameScope scope)
             throws FileSystemException {
         FileSystemException.requireNonNull(base, "Invalid base FileName.");
         FileSystemException.requireNonNull(name, "Invalid name FileName.");
         final FileName realBase;
         if (VFS.isUriStyle() && base.isFile()) {
             realBase = base.getParent();
         } else {
             realBase = base;
         }
 
         final StringBuilder buffer = new StringBuilder(name);
 
         // Adjust separators
         UriParser.fixSeparators(buffer);
         String scheme = UriParser.extractScheme(getSchemes(), buffer.toString());
 
         // Determine whether to prepend the base path
         if (name.isEmpty() || (scheme == null && buffer.charAt(0) != FileName.SEPARATOR_CHAR)) {
             // Supplied path is not absolute
             if (!VFS.isUriStyle()) {
                 // when using URIs the parent already do have the trailing "/"
                 buffer.insert(0, FileName.SEPARATOR_CHAR);
             }
             buffer.insert(0, realBase.getPath());
         }
 
         // Normalise the path
         final FileType fileType = UriParser.normalisePath(buffer);
 
         // Check the name is ok
         final String resolvedPath = buffer.toString();
         if (!AbstractFileName.checkName(realBase.getPath(), resolvedPath, scope)) {
             throw new FileSystemException("vfs.provider/invalid-descendent-name.error", name);
         }
 
         final String fullPath;
         if (scheme != null) {
             fullPath = resolvedPath;
         } else {
             scheme = realBase.getScheme();
             fullPath = realBase.getRootURI() + resolvedPath;
         }
         final FileProvider provider = providers.get(scheme);
         if (provider != null) {
             // TODO: extend the file name parser to be able to parse
             // only a pathname and take the missing informations from
             // the base. Then we can get rid of the string operation.
             // // String fullPath = base.getRootURI() +
             // resolvedPath.substring(1);
 
             return provider.parseUri(realBase, fullPath);
         }
 
         // An unknown scheme - hand it to the default provider - if possible
         if (scheme != null && defaultProvider != null) {
             return defaultProvider.parseUri(realBase, fullPath);
         }
 
         // TODO: avoid fallback to this point
         // this happens if we have a virtual filesystem (no provider for scheme)
         return ((AbstractFileName) realBase).createName(resolvedPath, fileType);
     }
 
     /**
      * Resolve the uri to a file name.
      *
      * @param uri The URI to resolve.
      * @return The FileName of the file.
      * @throws FileSystemException if an error occurs.
      */
     @Override
     public FileName resolveURI(final String uri) throws FileSystemException {
         UriParser.checkUriEncoding(uri);
 
         if (uri == null) {
             throw new IllegalArgumentException();
         }
 
         // Extract the scheme
         final String scheme = UriParser.extractScheme(getSchemes(), uri);
         if (scheme != null) {
             // An absolute URI - locate the provider
             final FileProvider provider = providers.get(scheme);
             if (provider != null) {
                 return provider.parseUri(null, uri);
             }
 
             // Otherwise, assume a local file
         }
 
         // Handle absolute file names
         if (localFileProvider != null && localFileProvider.isAbsoluteLocalName(uri)) {
             return localFileProvider.parseUri(null, uri);
         }
 
         if (scheme != null) {
             // An unknown scheme - hand it to the default provider
             FileSystemException.requireNonNull(defaultProvider, "vfs.impl/unknown-scheme.error", scheme, uri);
             return defaultProvider.parseUri(null, uri);
         }
 
         // Assume a relative name - use the supplied base file
         FileSystemException.requireNonNull(baseFile, "vfs.impl/find-rel-file.error", uri);
 
         return resolveName(baseFile.getName(), uri, NameScope.FILE_SYSTEM);
     }
 
     /**
      * Sets the base file to use when resolving relative URI.
      *
      * @param baseFile The new base FileObject.
      * @throws FileSystemException if an error occurs.
      */
     public void setBaseFile(final File baseFile) throws FileSystemException {
         this.baseFile = getLocalFileProvider().findLocalFile(baseFile);
     }
 
     /**
      * Sets the base file to use when resolving relative URI.
      *
      * @param baseFile The new base FileObject.
      */
     public void setBaseFile(final FileObject baseFile) {
         this.baseFile = baseFile;
     }
 
     /**
      * Set the cache strategy to use when dealing with file object data.
      * <p>
      * Can only be set before the FileSystemManager is initialized.
      * </p>
      * <p>
      * The default is {@link CacheStrategy#ON_RESOLVE}.
      * </p>
      *
      * @param fileCacheStrategy The CacheStrategy to use.
      * @throws FileSystemException if this is not possible. e.g. it is already set.
      */
     public void setCacheStrategy(final CacheStrategy fileCacheStrategy) throws FileSystemException {
         if (init) {
             throw new FileSystemException("vfs.impl/already-inited.error");
         }
 
         this.fileCacheStrategy = fileCacheStrategy;
     }
 
     /**
      * Sets the default provider. This is the provider that will handle URI with unknown schemes. The manager takes care
      * of all lifecycle management.
      *
      * @param provider The FileProvider.
      * @throws FileSystemException if an error occurs setting the provider.
      */
     public void setDefaultProvider(final FileProvider provider) throws FileSystemException {
         setupComponent(provider);
         defaultProvider = provider;
     }
 
     /**
      * set the fileContentInfoFactory used to determine the infos of a file content.
      * <p>
      * Can only be set before the FileSystemManager is initialized.
      * </p>
      *
      * @param fileContentInfoFactory The FileContentInfoFactory.
      * @throws FileSystemException if an error occurs setting the FileContentInfoFactory.
      */
     public void setFileContentInfoFactory(final FileContentInfoFactory fileContentInfoFactory)
             throws FileSystemException {
         if (init) {
             throw new FileSystemException("vfs.impl/already-inited.error");
         }
 
         this.fileContentInfoFactory = fileContentInfoFactory;
     }
 
     /**
      * Set a fileObject decorator to be used for ALL returned file objects.
      * <p>
      * Can only be set before the FileSystemManager is initialized.
      * </p>
      *
      * @param fileObjectDecorator must be inherted from {@link DecoratedFileObject} a has to provide a constructor with
      *            a single {@link FileObject} as argument
      * @throws FileSystemException if an error occurs setting the decorator.
      */
     public void setFileObjectDecorator(final Class<?> fileObjectDecorator) throws FileSystemException {
         if (init) {
             throw new FileSystemException("vfs.impl/already-inited.error");
         }
         if (!DecoratedFileObject.class.isAssignableFrom(fileObjectDecorator)) {
             throw new FileSystemException("vfs.impl/invalid-decorator.error", fileObjectDecorator.getName());
         }
 
         try {
             fileObjectDecoratorConst = fileObjectDecorator.getConstructor(FileObject.class);
         } catch (final NoSuchMethodException e) {
             throw new FileSystemException("vfs.impl/invalid-decorator.error", fileObjectDecorator.getName(), e);
         }
 
         this.fileObjectDecorator = fileObjectDecorator;
     }
 
     /**
      * Sets the filesCache implementation used to cache files.
      * <p>
      * Can only be set before the FileSystemManager is initialized.
      * </p>
      * <p>
      * The manager takes care of the lifecycle. If none is set, a default is picked in {@link #init()}.
      * </p>
      *
      * @param filesCache The FilesCache.
      * @throws FileSystemException if an error occurs setting the cache..
      */
     public void setFilesCache(final FilesCache filesCache) throws FileSystemException {
         if (init) {
             throw new FileSystemException("vfs.impl/already-inited.error");
         }
         this.filesCache = filesCache;
     }
 
     // -- OPERATIONS --
 
     /**
      * Sets the logger to use.
      * <p>
      * This overwrites the default logger for this manager and is not reset in {@link #close()}.
      * </p>
      *
      * @param log The Logger to use.
      */
     @Override
     public void setLogger(final Log log) {
         this.log = log;
     }
 
     /**
      * Sets the file replicator to use.
      * <p>
      * The manager takes care of all lifecycle management.
      * </p>
      *
      * @param replicator The FileReplicator.
      * @throws FileSystemException if an error occurs setting the replicator.
      */
     public void setReplicator(final FileReplicator replicator) throws FileSystemException {
         setupComponent(replicator);
         fileReplicator = replicator;
     }
 
     /**
      * Sets the temporary file store to use.
      * <p>
      * The manager takes care of all lifecycle management.
      * </p>
      *
      * @param tempFileStore The temporary FileStore.
      * @throws FileSystemException if an error occurs adding the file store.
      */
     public void setTemporaryFileStore(final TemporaryFileStore tempFileStore) throws FileSystemException {
         setupComponent(tempFileStore);
         this.tempFileStore = tempFileStore;
     }
 
     /**
      * Initializes a component, if it has not already been initialized.
      *
      * @param component The component to setup.
      * @throws FileSystemException if an error occurs.
      */
     private void setupComponent(final Object component) throws FileSystemException {
         if (!components.contains(component)) {
             if (component instanceof VfsComponent) {
                 final VfsComponent../org/apache/commons/vfs2/provider/VfsComponent.html#VfsComponent">VfsComponent vfsComponent = (VfsComponent) component;
                 vfsComponent.setLogger(getLogger());
                 vfsComponent.setContext(context);
                 vfsComponent.init();
             }
             components.add(component);
         }
     }
 
     /**
      * Converts a local file into a {@link FileObject}.
      *
      * @param file The input File.
      * @return the create FileObject
      * @throws FileSystemException if an error occurs creating the file.
      */
     @Override
     public FileObject toFileObject(final File file) throws FileSystemException {
         return getLocalFileProvider().findLocalFile(file);
     }
 
 }