/*
* 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.util.ArrayList;
import java.util.List;
import java.util.StringTokenizer;
import javax.servlet.ServletContext;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import com.ocpsoft.pretty.PrettyContext;
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;
/**
* Loads configuration files specified in web.xml init parameter
* {@link PrettyContext#CONFIG_KEY}
*
* @author <a href="mailto:lincolnbaxter@gmail.com">Lincoln Baxter, III</a>
*
*/
public class ContextSpecifiedConfigurationProvider implements ConfigurationProvider
{
private static final Log log = LogFactory.getLog(ContextSpecifiedConfigurationProvider.class);
public PrettyConfig loadConfiguration(ServletContext servletContext)
{
final PrettyConfigBuilder builder = new PrettyConfigBuilder();
PrettyConfigParser configParser = new DigesterPrettyConfigParser();
final List<String> configFilesList = getConfigFilesList(servletContext);
for (final String configFilePath : configFilesList)
{
final InputStream is = servletContext.getResourceAsStream(configFilePath);
if (is == null)
{
log.error("Pretty Faces config resource [" + configFilePath + "] not found.");
continue;
}
log.trace("Reading config [" + configFilePath + "].");
try
{
configParser.parse(builder, is);
}
catch (Exception e)
{
throw new PrettyException("Failed to parse PrettyFaces configuration from " + configFilePath, e);
}
finally
{
try
{
is.close();
}
catch (IOException ignored)
{
}
}
}
return builder.build();
}
private List<String> getConfigFilesList(ServletContext context)
{
final String configFiles = context.getInitParameter(PrettyContext.CONFIG_KEY);
final List<String> configFilesList = new ArrayList<String>();
if (configFiles != null)
{
final StringTokenizer st = new StringTokenizer(configFiles, ",", false);
while (st.hasMoreTokens())
{
final String systemId = st.nextToken().trim();
if (DefaultXMLConfigurationProvider.DEFAULT_PRETTY_FACES_CONFIG.equals(systemId))
{
log.warn("The file [" + DefaultXMLConfigurationProvider.DEFAULT_PRETTY_FACES_CONFIG + "] has been specified in the ["
+ PrettyContext.CONFIG_KEY + "] context parameter of "
+ "the deployment descriptor; this is unecessary and will be ignored.");
}
else
{
configFilesList.add(systemId);
}
}
}
return configFilesList;
}
}