public  void compose(ComponentManager cm) 
{
        this.m_manager = cm;
}

Compose this Composable object. We need to pass on the ComponentManager to the actual Source.

 public  void configure(Configuration conf) throws ConfigurationException 
{
        if (conf != null) {
            driverMap = new HashMap();
            Configuration[] xmldbConfigs = conf.getChildren("driver");
            for (int i = 0; i <  xmldbConfigs.length; i++) {
                String type = xmldbConfigs[i].getAttribute("type");
                String driver = xmldbConfigs[i].getAttribute("class");
                driverMap.put(type, driver);
                if (getLogger().isDebugEnabled()) {
                    getLogger().debug("Initializing XML:DB connection, using driver " + driver);
                }
                try {
                    Class c = Class.forName(driver);
                    DatabaseManager.registerDatabase((Database)c.newInstance());
                } catch (XMLDBException xde) {
                    String error = "Unable to connect to the XMLDB database. Error "
                                   + xde.errorCode + ": " + xde.getMessage();
                    getLogger().debug(error, xde);
                    throw new ConfigurationException(error, xde);
                } catch (Exception e) {
                    getLogger().error("There was a problem setting up the connection");
                    getLogger().error("Make sure that your driver is available");
                    throw new ConfigurationException("Problem setting up the connection to XML:DB: "
                                                     + e.getMessage(), e);
                }
            }
        } else {
            throw new ConfigurationException("XMLDB configuration not found");
        }
}

Configure the instance.

 public Source getSource(Environment environment,
    String location) throws MalformedURLException, IOException, ProcessingException 
{
      int start = location.indexOf(':") + 1;
      int end = location.indexOf(':", start);
        if (start == -1 || end == -1) {
            if (this.getLogger().isWarnEnabled()) {
                this.getLogger().warn("Mispelled XML:DB URL. " +
                    "The syntax is \"xmldb:databasetype://host/collection/resource\"");
                throw new MalformedURLException("Mispelled XML:DB URL. " +
                    "The syntax is \"xmldb:databasetype://host/collection/resource\"");
            }
        }
        String type = location.substring(start, end);
        driver = (String)driverMap.get(type);
        if (driver == null) {
            this.getLogger().error("Unable to find a driver for the \"" +
                type + " \" database type, please check the configuration");
            throw new ProcessingException("Unable to find a driver for the \"" +
                type + " \" database type, please check the configuration");
        }
        return new XMLDBSource(environment, m_manager, this.getLogger(), location);
}

Resolve the source

 public Source getSource(Environment environment,
    URL base,
    String location) throws MalformedURLException, IOException, ProcessingException 
{
        return getSource(environment, base.toExternalForm() + location);
}

Resolve the source