| /************************************************************** |
| * |
| * 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 com.sun.star.lib.util; |
| |
| import java.io.File; |
| import java.lang.reflect.Constructor; |
| import java.lang.reflect.InvocationTargetException; |
| import java.lang.reflect.Method; |
| import java.net.URL; |
| import java.net.URLDecoder; |
| import java.net.URLEncoder; |
| |
| /** |
| * Maps Java URL representations to File representations, on any Java version. |
| * |
| * @since UDK 3.2.8 |
| */ |
| public final class UrlToFileMapper { |
| |
| // java.net.URLEncoder.encode(String, String) and java.net.URI are only |
| // available since Java 1.4: |
| private static Method urlEncoderEncode; |
| private static Constructor uriConstructor; |
| private static Constructor fileConstructor; |
| static { |
| try { |
| urlEncoderEncode = URLEncoder.class.getMethod( |
| "encode", new Class[] { String.class, String.class }); |
| Class uriClass = Class.forName("java.net.URI"); |
| uriConstructor = uriClass.getConstructor( |
| new Class[] { String.class }); |
| fileConstructor = File.class.getConstructor( |
| new Class[] { uriClass }); |
| } catch (ClassNotFoundException e) { |
| } catch (NoSuchMethodException e) { |
| } |
| } |
| |
| /** |
| * Maps Java URL representations to File representations. |
| * |
| * @param url some URL, possibly null. |
| * @return a corresponding File, or null on failure. |
| */ |
| public static File mapUrlToFile(URL url) { |
| if (url == null) { |
| return null; |
| } else if (fileConstructor == null) { |
| // If java.net.URI is not available, hope that the following works |
| // well: First, check that the given URL has a certain form. |
| // Second, use the URLDecoder to decode the URL path (taking care |
| // not to change any plus signs to spaces), hoping that the used |
| // default encoding is the proper one for file URLs. Third, create |
| // a File from the decoded path. |
| return url.getProtocol().equalsIgnoreCase("file") |
| && url.getAuthority() == null && url.getQuery() == null |
| && url.getRef() == null |
| ? new File(URLDecoder.decode( |
| StringHelper.replace(url.getPath(), '+', "%2B"))) |
| : null; |
| } else { |
| // If java.net.URI is avaliable, do |
| // URI uri = new URI(encodedUrl); |
| // try { |
| // return new File(uri); |
| // } catch (IllegalArgumentException e) { |
| // return null; |
| // } |
| // where encodedUrl is url.toString(), but since that may contain |
| // unsafe characters (e.g., space, " "), it is encoded, as otherwise |
| // the URI constructor might throw java.net.URISyntaxException (in |
| // Java 1.5, URL.toURI might be used instead). |
| String encodedUrl = encode(url.toString()); |
| try { |
| Object uri = uriConstructor.newInstance( |
| new Object[] { encodedUrl }); |
| try { |
| return (File) fileConstructor.newInstance( |
| new Object[] { uri }); |
| } catch (InvocationTargetException e) { |
| if (e.getTargetException() instanceof |
| IllegalArgumentException) { |
| return null; |
| } else { |
| throw e; |
| } |
| } |
| } catch (InstantiationException e) { |
| throw new RuntimeException("This cannot happen: " + e); |
| } catch (IllegalAccessException e) { |
| throw new RuntimeException("This cannot happen: " + e); |
| } catch (InvocationTargetException e) { |
| if (e.getTargetException() instanceof Error) { |
| throw (Error) e.getTargetException(); |
| } else if (e.getTargetException() instanceof RuntimeException) { |
| throw (RuntimeException) e.getTargetException(); |
| } else { |
| throw new RuntimeException("This cannot happen: " + e); |
| } |
| } |
| } |
| } |
| |
| |
| |
| private static String encode(String url) { |
| StringBuffer buf = new StringBuffer(); |
| for (int i = 0; i < url.length(); ++i) { |
| char c = url.charAt(i); |
| // The RFC 2732 <uric> characters: !$&'()*+,-./:;=?@[]_~ plus digits |
| // and letters; additionally, do not encode % again. |
| if (c >= 'a' && c <= 'z' || c >= '?' && c <= '[' |
| || c >= '$' && c <= ';' || c == '!' || c == '=' || c == ']' |
| || c == '_' || c == '~') |
| { |
| buf.append(c); |
| } else if (c == ' ') { |
| buf.append("%20"); |
| } else { |
| String enc; |
| try { |
| enc = (String) urlEncoderEncode.invoke( |
| null, |
| new Object[] {Character.toString(c), "UTF-8" }); |
| } catch (IllegalAccessException e) { |
| throw new RuntimeException("This cannot happen: " + e); |
| } catch (InvocationTargetException e) { |
| throw new RuntimeException("This cannot happen: " + e); |
| } |
| buf.append(enc); |
| } |
| } |
| return buf.toString(); |
| } |
| |
| private UrlToFileMapper() {} |
| } |