Mega Code Archive
Make a URL from the given string
<![CDATA[
import java.io.File;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLDecoder;
import java.util.Map;
/*
* JBoss, Home of Professional Open Source
* Copyright 2005, JBoss Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software 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 for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
public class Main{
/**
* Make a URL from the given string.
*
* <p>
* If the string is a properly formatted file URL, then the file
* portion will be made canonical.
*
* <p>
* If the string is an invalid URL then it will be converted into a
* file URL.
*
* @param urlspec The string to construct a URL for.
* @param relativePrefix The string to prepend to relative file
* paths, or null to disable prepending.
* @return A URL for the given string.
*
* @throws MalformedURLException Could not make a URL for the given string.
*/
public static URL toURL(String urlspec, final String relativePrefix) throws MalformedURLException
{
urlspec = urlspec.trim();
URL url;
try
{
url = new URL(urlspec);
if (url.getProtocol().equals("file"))
{
url = makeURLFromFilespec(url.getFile(), relativePrefix);
}
}
catch (Exception e)
{
// make sure we have a absolute & canonical file url
try
{
url = makeURLFromFilespec(urlspec, relativePrefix);
}
catch (IOException n)
{
//
// jason: or should we rethrow e?
//
throw new MalformedURLException(n.toString());
}
}
return url;
}
public static URI toURI(String urispec, final String relativePrefix)
throws URISyntaxException
{
urispec = urispec.trim();
URI uri;
if( urispec.startsWith("file:") )
{
uri = makeURIFromFilespec(urispec.substring(5), relativePrefix);
}
else
{
uri = new URI(urispec);
}
return uri;
}
/** A helper to make a URL from a filespec. */
private static URL makeURLFromFilespec(final String filespec, final String relativePrefix)
throws IOException
{
// make sure the file is absolute & canonical file url
File file = new File(decode(filespec));
// if we have a prefix and the file is not abs then prepend
if (relativePrefix != null && !file.isAbsolute())
{
file = new File(relativePrefix, filespec);
}
// make sure it is canonical (no ../ and such)
file = file.getCanonicalFile();
return file.toURI().toURL();
}
private static String decode(String filespec)
{
try
{
return URLDecoder.decode(filespec, "UTF-8");
}
catch (UnsupportedEncodingException e)
{
throw new RuntimeException("Error decoding filespec: " + filespec, e);
}
}
private static URI makeURIFromFilespec(final String filespec, final String relativePrefix)
{
// make sure the file is absolute & canonical file url
File file = new File(decode(filespec));
// if we have a prefix and the file is not abs then prepend
if (relativePrefix != null && !file.isAbsolute())
{
file = new File(relativePrefix, filespec);
}
return file.toURI();
}
/**
* Make a URL from the given string.
*
* @see #toURL(String,String)
*
* @param urlspec The string to construct a URL for.
* @return A URL for the given string.
*
* @throws MalformedURLException Could not make a URL for the given string.
*/
public static URL toURL(final String urlspec) throws MalformedURLException
{
return toURL(urlspec, null);
}
/**
*
* @param urispec
* @return the uri
* @throws URISyntaxException for any error
*/
public static URI toURI(final String urispec)
throws URISyntaxException
{
return toURI(urispec, null);
}
}
]]>