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/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* 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 .
*/
package com.sun.star.lib.util;
import java.io.File;
import java.io.UnsupportedEncodingException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLEncoder;
/**
* Maps Java URL representations to File representations, on any Java version.
*
* This used to be used to do URL to File mapping in pre-Java1.4 days, but since
* we now require Java 1.5, it is largely unnecessary.
*
* @since UDK 3.2.8
*/
public final class UrlToFileMapper {
/**
* 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 {
try {
// 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());
URI uri = new URI(encodedUrl);
try {
return new File(uri);
} catch (IllegalArgumentException e) {
return null;
}
} catch (URISyntaxException ex) {
throw new RuntimeException(ex); // should never happend
}
}
}
private static String encode(String url) {
StringBuffer buf = new StringBuffer(url.length());
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 {
try {
String enc = URLEncoder.encode(Character.toString(c), "UTF-8");
buf.append(enc);
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(e); // should never happen
}
}
}
return buf.toString();
}
private UrlToFileMapper() {}
}
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