/*
* IronJacamar, a Java EE Connector Architecture implementation
* Copyright 2011, Red Hat Inc, and individual contributors
* as indicated by the @author tags. See the copyright.txt file 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.
*/
package org.jboss.jca.as.upgrader;
import java.io.IOException;
import java.io.StringReader;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
/**
* maven-metadata.xml utilities
*
* @author <a href="mailto:jesper.pedersen@jboss.org">Jesper Pedersen</a>
*/
public class MavenMetadata
{
/**
* Get the version from the specified url
* @param url The url
* @return The value
* @exception IOException Thrown if the version can't be resolved
*/
public static String getVersion(String url) throws IOException
{
try
{
Http http = new Http();
String mavenMetadataXml = http.get(url);
StringReader sr = new StringReader(mavenMetadataXml);
XMLInputFactory xmlInputFactory = XMLInputFactory.newInstance();
XMLStreamReader xmlStreamReader = xmlInputFactory.createXMLStreamReader(sr);
String version = null;
while (version == null && xmlStreamReader.hasNext())
{
int eventCode = xmlStreamReader.next();
switch (eventCode)
{
case XMLStreamReader.START_ELEMENT :
if ("value".equals(xmlStreamReader.getLocalName()))
{
version = readString(xmlStreamReader);
}
break;
default :
}
}
if (version != null)
return version;
}
catch (Throwable t)
{
throw new IOException("Unable to read: " + url, t);
}
throw new IOException("Unable to read: " + url);
}
/**
* Read a string
* @param xmlStreamReader The XML stream
* @return The parameter
* @exception XMLStreamException Thrown if an exception occurs
*/
private static String readString(XMLStreamReader xmlStreamReader) throws XMLStreamException
{
String result = null;
int eventCode = xmlStreamReader.next();
while (eventCode != XMLStreamReader.END_ELEMENT)
{
switch (eventCode)
{
case XMLStreamReader.CHARACTERS :
if (!xmlStreamReader.getText().trim().equals(""))
result = xmlStreamReader.getText().trim();
break;
default :
}
eventCode = xmlStreamReader.next();
}
return result;
}
}