| /* |
| * 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.util.HashMap; |
| import java.util.Map; |
| |
| import org.apache.commons.vfs2.FileContent; |
| import org.apache.commons.vfs2.FileObject; |
| import org.apache.commons.vfs2.FileSystemException; |
| |
| /** |
| * A helper class that determines the provider to use for a file. |
| */ |
| class FileTypeMap |
| { |
| private final Map<String, String> mimeTypeMap = new HashMap<String, String>(); |
| private final Map<String, String> extensionMap = new HashMap<String, String>(); |
| |
| /** |
| * Adds a MIME type mapping. |
| */ |
| public void addMimeType(final String mimeType, final String scheme) |
| { |
| mimeTypeMap.put(mimeType, scheme); |
| } |
| |
| /** |
| * Adds a filename extension mapping. |
| */ |
| public void addExtension(final String extension, final String scheme) |
| { |
| extensionMap.put(extension, scheme); |
| } |
| |
| /** |
| * Find the scheme for the provider of a layered file system. |
| * <p> |
| * This will check the FileContentInfo or file extension. |
| * @return Scheme supporting the file type or null (if unknonw). |
| */ |
| public String getScheme(final FileObject file) throws FileSystemException |
| { |
| // Check the file's mime type for a match |
| final FileContent content = file.getContent(); |
| final String mimeType = content.getContentInfo().getContentType(); |
| if (mimeType != null) |
| { |
| return mimeTypeMap.get(mimeType); |
| } |
| |
| // no specific mime-type - if it is a file also check the extension |
| if (!file.isFile()) |
| { |
| return null; // VFS-490 folders don't use extensions for mime-type |
| } |
| final String extension = file.getName().getExtension(); |
| return extensionMap.get(extension); |
| } |
| |
| /** |
| * Removes all extensions and scheme mappings. |
| */ |
| public void clear() |
| { |
| mimeTypeMap.clear(); |
| extensionMap.clear(); |
| } |
| } |