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Diffstat (limited to 'jurt/com/sun/star/lib/util/UrlToFileMapper.java')
| -rw-r--r-- | jurt/com/sun/star/lib/util/UrlToFileMapper.java | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/jurt/com/sun/star/lib/util/UrlToFileMapper.java b/jurt/com/sun/star/lib/util/UrlToFileMapper.java new file mode 100644 index 000000000000..c356e8410b2c --- /dev/null +++ b/jurt/com/sun/star/lib/util/UrlToFileMapper.java @@ -0,0 +1,161 @@ +/************************************************************************* + * + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * Copyright 2000, 2010 Oracle and/or its affiliates. + * + * OpenOffice.org - a multi-platform office productivity suite + * + * This file is part of OpenOffice.org. + * + * OpenOffice.org is free software: you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 3 + * only, as published by the Free Software Foundation. + * + * OpenOffice.org is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Lesser General Public License version 3 for more details + * (a copy is included in the LICENSE file that accompanied this code). + * + * You should have received a copy of the GNU Lesser General Public License + * version 3 along with OpenOffice.org. If not, see + * <http://www.openoffice.org/license.html> + * for a copy of the LGPLv3 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[] { new Character(c).toString(), "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() {} +} |