/*

  * Copyright (c) 2003-2011, Simon Brown

  * All rights reserved.

  *

  * Redistribution and use in source and binary forms, with or without

  * modification, are permitted provided that the following conditions are met:

  *

  *   - Redistributions of source code must retain the above copyright

  *     notice, this list of conditions and the following disclaimer.

  *

  *   - Redistributions in binary form must reproduce the above copyright

  *     notice, this list of conditions and the following disclaimer in

  *     the documentation and/or other materials provided with the

  *     distribution.

  *

  *   - Neither the name of Pebble nor the names of its contributors may

  *     be used to endorse or promote products derived from this software

  *     without specific prior written permission.

  *

  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE

  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

  * POSSIBILITY OF SUCH DAMAGE.

  */

 package net.sourceforge.pebble;

 import net.sourceforge.pebble.security.SecurityRealm;

 import net.sourceforge.pebble.util.RelativeDate;

 import org.apache.commons.logging.Log;

 import org.apache.commons.logging.LogFactory;

 import org.springframework.context.ApplicationContext;

 import java.io.IOException;

 import java.io.InputStream;

 import java.util.Date;

 import java.util.Map;

 import java.util.Properties;

 /**

  * A bean representing the Pebble context.

  *

  * @author    Simon Brown

  */

 public class PebbleContext {

   /** the log used by this class */

   private static Log log = LogFactory.getLog(PebbleContext.class);

   private Configuration configuration;

   private ApplicationContext applicationContext;

   private String buildVersion;

   private String buildDate;

   private static final String BUILD_VERSION_KEY = "build.version";

   private static final String BUILD_DATE_KEY = "build.date";

   /** the time that Pebble was started */

   private Date startTime;

   /** the directory where Pebble is deployed */

   private String webApplicationRoot;

   private static final PebbleContext instance = new PebbleContext();

   public static PebbleContext getInstance() {

     return instance;

   }

   private PebbleContext() {

     // and note when Pebble was started

     this.startTime = new Date();

     try {

       Properties buildProperties = new Properties();

       InputStream in = getClass().getClassLoader().getResourceAsStream(

               "META-INF/maven/org.sourceforge.pebble/pebble/pom.properties");

       if (in != null) {

         buildProperties.load(in);

         this.buildVersion = buildProperties.getProperty("version");

         // It's a little harder to do this in maven, seeing as it's not used anyway, commenting out.

         // this.buildDate = buildProperties.getProperty(BUILD_DATE_KEY);

         in.close();

       } else {

         log.warn("No maven pom.properties found, build version set for development");

         this.buildVersion = "dev";

       }

     } catch (IOException e) {

       log.error(e.getMessage(), e);

       e.printStackTrace();

     }

   }

   /**

    * Gets the version of Pebble being used.

    *

    * @return    the version number as a String

    */

   public String getBuildVersion() {

     return this.buildVersion;

   }

   /**

    * Gets the date that Pebble was built.

    *

    * @return    the date as a String

    */

   public String getBuildDate() {

     return this.buildDate;

   }

   /**

    * Gets the amount of time that Pebble has been running for.

    *

    * @return  a number of milliseconds

    */

   public RelativeDate getUptime() {

     return new RelativeDate(new Date().getTime() - startTime.getTime());

   }

   public long getMemoryUsageInKB() {

     return (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1024;

   }

   public long getTotalMemoryInKB() {

     return Runtime.getRuntime().totalMemory() / 1024;

   }

   public Configuration getConfiguration() {

     return configuration;

   }

   public void setConfiguration(Configuration configuration) {

     this.configuration = configuration;

   }

   /**

    * Sets the directory where themes are located.

    *

    * @param webApplicationRoot    the absolute path to the webapp root on disk

    */

   public void setWebApplicationRoot(String webApplicationRoot) {

     this.webApplicationRoot = webApplicationRoot;

   }

   public String getWebApplicationRoot() {

     return webApplicationRoot;

   }

   public void setApplicationContext(ApplicationContext applicationContext) {

     this.applicationContext = applicationContext;

   }

   public ApplicationContext getApplicationContext() {

     return applicationContext;

   }

   public <T> T getComponent(String name, Class<T> type) {

     return applicationContext.getBean(name, type);

   }

   public <T> T getComponent(Class<T> type) {

     Map<String, T> map = applicationContext.getBeansOfType(type);

     if (map.isEmpty()) {

       return null;

     } else if (map.size() > 1) {

       throw new IllegalArgumentException("Multiple beans of type " + type + " found.");

     } else {

       return map.values().iterator().next();

     }

   }

 }