/*
* JBoss, Home of Professional Open Source.
* Copyright 2006, Red Hat Middleware LLC, 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.cache.factories;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.jboss.cache.config.Configuration;
import org.jboss.cache.config.ConfigurationException;
import org.jboss.cache.xml.XmlHelper;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
/**
* Parser able to parse a series of cache configurations stored in an
* XML document with the following structure:
* <pre>
* <cache-configs>
* <cache-config name="configA">
* ....
* </cache-config>
* <cache-config name="configB">
* ....
* </cache-config>
* </cache-configs>
* </pre>
* <p/>
* The '....' represents the normal content of the mbean element in a
* JBC -service.xml config file.
*
* @author <a href="brian.stansberry@jboss.com">Brian Stansberry</a>
* @version $Revision: 1.1 $
*/
public class CacheConfigsXmlParser
{
/** Name of the root element in a cache configs XML document*/
public static final String DOCUMENT_ROOT = "cache-configs";
/**
* Name of the element that represents an individual cache configuration
* in a cache configs XML document.
*/
public static final String CONFIG_ROOT = "cache-config";
/**
* Name of the attribute in a {@link #CONFIG_ROOT cache-config} element that specifies
* the name of the configuration.
*/
public static final String CONFIG_NAME = "name";
private static final Log log = LogFactory.getLog(CacheConfigsXmlParser.class);
private final XmlConfigurationParser parser = new XmlConfigurationParser();
public Map<String, Configuration> parseConfigs(String fileName) throws CloneNotSupportedException
{
InputStream is = getAsInputStreamFromClassLoader(fileName);
if (is == null)
{
if (log.isDebugEnabled())
log.debug("Unable to find configuration file " + fileName + " in classpath; searching for this file on the filesystem instead.");
try
{
is = new FileInputStream(fileName);
}
catch (FileNotFoundException e)
{
throw new ConfigurationException("Unable to find config file " + fileName + " either in classpath or on the filesystem!", e);
}
}
return parseConfigs(is);
}
public Map<String, Configuration> parseConfigs(InputStream stream) throws CloneNotSupportedException
{
// loop through all elements in XML.
Element root = XmlHelper.getDocumentRoot(stream);
NodeList list = root.getElementsByTagName(CONFIG_ROOT);
if (list == null || list.getLength() == 0)
throw new ConfigurationException("Can't find " + CONFIG_ROOT + " tag");
Map<String, Configuration> result = new HashMap<String, Configuration>();
for (int i = 0; i < list.getLength(); i++)
{
Node node = list.item(i);
if (node.getNodeType() != Node.ELEMENT_NODE)
{
continue;
}
Element element = (Element) node;
String name = element.getAttribute(CONFIG_NAME);
if (name == null || name.trim().length() == 0)
throw new ConfigurationException("Element " + element + " has no name attribute");
Configuration c = parser.parseConfiguration(element);
// Prove that we can successfully clone it
c = c.clone();
result.put(name.trim(), c);
}
return result;
}
protected InputStream getAsInputStreamFromClassLoader(String filename)
{
InputStream is = Thread.currentThread().getContextClassLoader().getResourceAsStream(filename);
if (is == null)
{
// check system class loader
is = getClass().getClassLoader().getResourceAsStream(filename);
}
return is;
}
}