/**
* Redistribution and use of this software and associated documentation
* ("Software"), with or without modification, are permitted provided
* that the following conditions are met:
*
* 1. Redistributions of source code must retain copyright
* statements and notices. Redistributions must also contain a
* copy of this document.
*
* 2. Redistributions in binary form must reproduce the
* above copyright notice, this list of conditions and the
* following disclaimer in the documentation and/or other
* materials provided with the distribution.
*
* 3. The name "Exolab" must not be used to endorse or promote
* products derived from this Software without prior written
* permission of Intalio, Inc. For written permission,
* please contact info@exolab.org.
*
* 4. Products derived from this Software may not be called "Exolab"
* nor may "Exolab" appear in their names without prior written
* permission of Intalio, Inc. Exolab is a registered
* trademark of Intalio, Inc.
*
* 5. Due credit should be given to the Exolab Project
* (http://www.exolab.org/).
*
* THIS SOFTWARE IS PROVIDED BY INTALIO, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
* NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* INTALIO, INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Copyright 2002 (C) Intalio, Inc. All Rights Reserved.
*
* $Id$
*/
package org.exolab.castor.net.util;
import org.exolab.castor.net.URIResolver;
import org.exolab.castor.net.URIException;
import org.exolab.castor.net.URILocation;
/**
* The default implementation of URIResolver
* @author <a href="mailto:kvisco@intalio.com">Keith Visco</a>
* @author <a href="mailto:blandin@intalio.com">Arnaud Blandin</a>
* @version $Revision$ $Date: 2003-03-03 02:57:21 -0700 (Mon, 03 Mar 2003) $
**/
public final class URIResolverImpl implements URIResolver {
private static final String HTTP_PROTOCOL = "http:";
private static final String FILE_PROTOCOL = "file:";
public URIResolverImpl() {
super();
} //-- URIResolver;
/**
* Resolves the given href and documentBase.
* The href can either be an absolute or a relative URI as defined by
* IETF RFC 2396:
* <ul>
* <li><b>Absolute</b> URI: [scheme]:'//'[authority][absolute path]</li>
* <li><b>Relative</b> URI: '//'[authority][absolute path] or [relative path]
* or [absolute path].</li>
* </ul>
*
* <p><b>Note</b>:
* <ol>
* <li>When [authority] is not used then '//' must not be used.</li>
* <li>An [absolute path] begins by a '/' sign.</li>
* </ol>
* For instance the following URIs are valid:
* <blockquote>
* <pre>
* file:/c:/Program Files/MyApp/myresource.xml
* file://usr/etc/myresource.xml
* http://www.castor.org/index.html
* ../relative/index.html
* </pre>
* </blockquote>
* However, the following <b>won't</b> be valid:
* <blockquote>
* <pre>
* file://c:/Program Files/MyApp/myresource.xml
* </pre>
* </blockquote>
*
* @return the URILocation for the URI
**/
public URILocation resolve(String href, String documentBase)
throws URIException
{
URILocation uriLocation = null;
boolean stripHostSeparator = (java.io.File.separatorChar == '\\');
//--true if the path in the href is absolute
boolean absolute = false;
//1--Is there a scheme? If yes the URI is absolute.
//NOTE: only HTTP and File protocols are currently supported.
if ( href.startsWith(HTTP_PROTOCOL) || href.startsWith(FILE_PROTOCOL) ) {
absolute = true;
}
//2-- handle relative URIs: '//'<authority>[absolute path]
//or [relative path] or [absolute path]
if (!absolute) {
if (stripHostSeparator) {
if (href.startsWith("//"))
absolute = true;
} else if (href.startsWith("///")) {
absolute = true;
}
}
//3--[relative path]
if (!absolute) {
if (href.startsWith("./"))
href = href.substring(2);
//--resolve using the document base
if (documentBase != null) {
//--resolve the previous directory
while (href.startsWith("../")) {
href = href.substring(3);
documentBase = documentBase.substring(0,documentBase.lastIndexOf('/'));
documentBase = documentBase.substring(0,documentBase.lastIndexOf('/')+1);
}
}//--documentBase != null
}
try {
uriLocation = new URILocationImpl(href, documentBase);
}
catch (RuntimeException ex) {
throw new URIException(ex.getMessage(), ex);
}
return uriLocation;
} //-- resolve
/**
* Resolves the given urn. An implementation of this
* method may return null if the URN could not be resolved.
*
* @return the URILocation for the URN
*/
public URILocation resolveURN(String urn)
throws URIException
{
return null;
} //-- resolveURN
} //-- URIResolver