1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 package org.apache.commons.vfs2.impl; 18 19 import java.util.HashMap; 20 import java.util.Map; 21 22 import org.apache.commons.vfs2.FileContent; 23 import org.apache.commons.vfs2.FileContentInfo; 24 import org.apache.commons.vfs2.FileObject; 25 import org.apache.commons.vfs2.FileSystemException; 26 27 /** 28 * A helper class that determines the provider to use for a file. 29 */ 30 final class FileTypeMap { 31 32 private final Map<String, String> mimeTypeMap = new HashMap<>(); 33 private final Map<String, String> extensionMap = new HashMap<>(); 34 35 /** 36 * Adds a file name extension mapping. 37 */ 38 public void addExtension(final String extension, final String scheme) { 39 extensionMap.put(extension, scheme); 40 } 41 42 /** 43 * Adds a MIME type mapping. 44 */ 45 public void addMimeType(final String mimeType, final String scheme) { 46 mimeTypeMap.put(mimeType, scheme); 47 } 48 49 /** 50 * Removes all extensions and scheme mappings. 51 */ 52 public void clear() { 53 mimeTypeMap.clear(); 54 extensionMap.clear(); 55 } 56 57 /** 58 * Gets the scheme for the provider of a layered file system. 59 * <p> 60 * This will check the {@link FileContentInfo} or file extension. 61 * </p> 62 * 63 * @param fileObject The file object to query. 64 * @return Scheme supporting the file type or null (if unknown). 65 * @throws FileSystemException if an error occurs. 66 */ 67 public String getScheme(final FileObject fileObject) throws FileSystemException { 68 // Check the file's mime type for a match 69 final FileContent content = fileObject.getContent(); 70 final String mimeType = content.getContentInfo().getContentType(); 71 if (mimeType != null) { 72 return mimeTypeMap.get(mimeType); 73 } 74 75 // no specific mime-type - if it is a file also check the extension 76 if (!fileObject.isFile()) { 77 return null; // VFS-490 folders don't use extensions for mime-type 78 } 79 return extensionMap.get(fileObject.getName().getExtension()); 80 } 81 }