| /* |
| * 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.harmony.luni.internal.net.www; |
| |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.net.FileNameMap; |
| import java.security.AccessController; |
| import java.security.PrivilegedAction; |
| import java.util.Properties; |
| |
| /** |
| * Instances of this class map file extensions to MIME content types based on a |
| * default MIME table. |
| * |
| * The default values can be overridden by modifying the contents of the file |
| * "content-types.properties". |
| */ |
| public class MimeTable implements FileNameMap { |
| |
| public static final String UNKNOWN = "content/unknown"; //$NON-NLS-1$ |
| |
| /** |
| * A hash table containing the mapping between extensions and mime types. |
| */ |
| public static final Properties types = new Properties(); |
| |
| // Default mapping. |
| static { |
| types.setProperty("text", "text/plain"); //$NON-NLS-1$ //$NON-NLS-2$ |
| types.setProperty("txt", "text/plain"); //$NON-NLS-1$ //$NON-NLS-2$ |
| types.setProperty("htm", "text/html"); //$NON-NLS-1$ //$NON-NLS-2$ |
| types.setProperty("html", "text/html"); //$NON-NLS-1$ //$NON-NLS-2$ |
| } |
| |
| /** |
| * Constructs a MIME table using the default values defined in this class. |
| * |
| * It then augments this table by reading pairs of extensions and |
| * corresponding content types from the file "content-types.properties", |
| * which is represented in standard java.util.Properties.load(...) format. |
| */ |
| public MimeTable() { |
| InputStream str = AccessController |
| .doPrivileged(new PrivilegedAction<InputStream>() { |
| public InputStream run() { |
| return getContentTypes(); |
| } |
| }); |
| |
| if (str != null) { |
| try { |
| try { |
| types.load(str); |
| } finally { |
| str.close(); |
| } |
| } catch (IOException ex) { |
| // Ignore |
| } |
| } |
| } |
| |
| /** |
| * Answer an InputStream over an external properties file containing the |
| * MIME types. |
| * |
| * Looks in the location specified in the user property, and then in the |
| * expected location. |
| * |
| * @return the InputStream, or null if none. |
| */ |
| private InputStream getContentTypes() { |
| // User override? |
| String userTable = System.getProperty("content.types.user.table"); //$NON-NLS-1$ |
| if (userTable != null) { |
| try { |
| return new FileInputStream(userTable); |
| } catch (IOException e) { |
| // Ignore invalid values |
| } |
| } |
| |
| // Standard location? |
| String javahome = System.getProperty("java.home"); //$NON-NLS-1$ |
| File contentFile = new File(javahome, "lib" //$NON-NLS-1$ |
| + File.separator + "content-types.properties"); //$NON-NLS-1$ |
| try { |
| return new FileInputStream(contentFile); |
| } catch (IOException e) { |
| // Not found or can't read |
| } |
| |
| return null; |
| } |
| |
| /** |
| * Determines the MIME type for the given filename. |
| * |
| * @param filename |
| * The file whose extension will be mapped. |
| * |
| * @return The mime type associated with the file's extension or null if no |
| * mapping is known. |
| */ |
| public String getContentTypeFor(String filename) { |
| if (filename.endsWith("/")) { //$NON-NLS-1$ |
| // a directory, return html |
| return (String) types.get("html"); //$NON-NLS-1$ |
| } |
| int lastCharInExtension = filename.lastIndexOf('#'); |
| if (lastCharInExtension < 0) { |
| lastCharInExtension = filename.length(); |
| } |
| int firstCharInExtension = filename.lastIndexOf('.') + 1; |
| String ext = ""; //$NON-NLS-1$ |
| if (firstCharInExtension > filename.lastIndexOf('/')) { |
| ext = filename.substring(firstCharInExtension, lastCharInExtension); |
| } |
| return types.getProperty(ext.toLowerCase()); |
| } |
| } |