Package com.liferay.faces.util.config

Source Code of com.liferay.faces.util.config.ApplicationConfigInitializerImpl

/**
* Copyright (c) 2000-2014 Liferay, Inc. All rights reserved.
*
* This library 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 library 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.
*/
package com.liferay.faces.util.config;

import java.io.IOException;

import javax.faces.context.ExternalContext;
import javax.faces.context.FacesContext;
import javax.xml.parsers.SAXParser;

import com.liferay.faces.util.logging.Logger;
import com.liferay.faces.util.logging.LoggerFactory;
import com.liferay.faces.util.xml.SAXParserFactory;


/**
* @author  Neil Griffin
*/
public class ApplicationConfigInitializerImpl implements ApplicationConfigInitializer {

  // Logger
  private static final Logger logger = LoggerFactory.getLogger(ApplicationConfigInitializerImpl.class);

  // Private Data Members
  private String contextPath;
  private boolean resolveEntities;

  public ApplicationConfigInitializerImpl(String contextPath, boolean resolveEntities) {
    this.contextPath = contextPath;
    this.resolveEntities = resolveEntities;
  }

  public ApplicationConfig initialize() throws IOException {

    // Obtain the current ClassLoader
    ClassLoader classLoader = Thread.currentThread().getContextClassLoader();

    // Obtain a ResourceReader that is compatible with a startup ExternalContext
    ResourceReader resourceReader = newResourceReader();

    // Obtain a SAX Parser Factory.
    SAXParserFactory saxParserFactory = SAXParserFactory.newInstance();
    saxParserFactory.setValidating(false);
    saxParserFactory.setNamespaceAware(true);

    try {

      // Obtain a SAX Parser from the factory.
      SAXParser saxParser = saxParserFactory.newSAXParser();

      // Scan all the web.xml and web-fragment.xml descriptors in the classpath.
      WebConfigScanner webConfigScanner = newWebConfigScanner(classLoader, resourceReader, saxParser,
          resolveEntities);
      WebConfig webConfig = webConfigScanner.scan();

      // Scan all the faces-config.xml descriptors in the classpath.
      FacesConfigScanner facesConfigScanner = newFacesConfigScanner(classLoader, resourceReader, saxParser,
          resolveEntities, webConfig);
      FacesConfig facesConfig = facesConfigScanner.scan();

      return new ApplicationConfigImpl(contextPath, facesConfig, webConfig);
    }
    catch (Exception e) {

      // Log the error before throwing since the developer will need to see the stacktrace and
      // IOException(Throwable) wasn't added until Java 6.
      logger.error(e);
      throw new IOException(e.getMessage());
    }
  }

  protected FacesConfigScanner newFacesConfigScanner(ClassLoader classLoader, ResourceReader resourceReader,
    SAXParser saxParser, boolean resolveEntities, WebConfig webConfig) {
    return new FacesConfigScannerImpl(classLoader, resourceReader, saxParser, resolveEntities, webConfig);
  }

  protected ResourceReader newResourceReader() {
    FacesContext startupFacesContext = FacesContext.getCurrentInstance();
    ExternalContext startupExternalContext = startupFacesContext.getExternalContext();

    return new ResourceReaderExternalContextImpl(startupExternalContext);
  }

  protected WebConfigScanner newWebConfigScanner(ClassLoader classLoader, ResourceReader resourceReader,
    SAXParser saxParser, boolean resolveEntities) {
    return new WebConfigScannerImpl(classLoader, resourceReader, saxParser, resolveEntities);
  }

}
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