/*
* Copyright 2010 Lincoln Baxter, III
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.ocpsoft.pretty.faces.config.spi;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import java.util.Enumeration;
import javax.servlet.ServletContext;
import org.xml.sax.SAXException;
import com.ocpsoft.pretty.PrettyException;
import com.ocpsoft.pretty.faces.config.DigesterPrettyConfigParser;
import com.ocpsoft.pretty.faces.config.PrettyConfig;
import com.ocpsoft.pretty.faces.config.PrettyConfigBuilder;
import com.ocpsoft.pretty.faces.config.PrettyConfigParser;
import com.ocpsoft.pretty.faces.spi.ConfigurationProvider;
/**
* @author <a href="mailto:lincolnbaxter@gmail.com">Lincoln Baxter, III</a>
*
*/
public class ClassLoaderConfigurationProvider implements ConfigurationProvider
{
public static final String PRETTY_CONFIG_RESOURCE = "META-INF/pretty-config.xml";
public static final String CLASSPATH_CONFIG_ENABLED = "com.ocpsoft.pretty.LOAD_CLASSPATH_CONFIG";
public PrettyConfig loadConfiguration(ServletContext context)
{
String enabled = context.getInitParameter(CLASSPATH_CONFIG_ENABLED);
if ((enabled != null) && "false".equalsIgnoreCase(enabled.trim()))
{
return null;
}
final PrettyConfigBuilder builder = new PrettyConfigBuilder();
PrettyConfigParser configParser = new DigesterPrettyConfigParser();
try
{
final Enumeration<URL> urls = getClass().getClassLoader().getResources(PRETTY_CONFIG_RESOURCE);
if (urls != null)
{
while (urls.hasMoreElements())
{
final URL url = urls.nextElement();
if (url != null)
{
InputStream is = null;
try
{
is = openStream(url);
try
{
configParser.parse(builder, is);
}
catch (SAXException e)
{
throw new PrettyException("Failed to parse PrettyFaces configuration from URL:" + url, e);
}
}
finally
{
if (is != null)
{
is.close();
}
}
}
}
}
}
catch (Exception e)
{
throw new PrettyException("Could not get references to PrettyFaces ClassLoader-configuration elements.", e);
}
return builder.build();
}
private InputStream openStream(final URL url) throws IOException
{
final URLConnection connection = url.openConnection();
connection.setUseCaches(false);
return connection.getInputStream();
}
}