/**

  * Copyright (c) 2012-2014, jcabi.com

  * All rights reserved.

  *

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

  * modification, are permitted provided that the following conditions

  * are met: 1) Redistributions of source code must retain the above

  * copyright notice, this list of conditions and the following

  * disclaimer. 2) 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. 3) Neither the name of the jcabi.com 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 HOLDER 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 com.jcabi.manifests;

 import com.jcabi.log.Logger;

 import java.io.IOException;

 import java.io.InputStream;

 import java.net.URL;

 import java.util.ArrayList;

 import java.util.Collection;

 import javax.servlet.ServletContext;

 /**

  * Manifests in servlet context.

  *

  * Append attributes from the web application {@code MANIFEST.MF}.

  *

  * <p>You can use this class in your own

  * {@link javax.servlet.Filter} or

  * {@link javax.servlet.ServletContextListener},

  * in order to inject {@code MANIFEST.MF} attributes to the class:

  *

  * <pre> Manifests.append(new ServletMfs(context));</pre>

  *

  * <p>The class is thread-safe.

  *

  * @author Yegor Bugayenko (yegor@tpc2.com)

  * @version $Id$

  * @since 1.0

  */

 public final class ServletMfs implements Mfs {

     /**

      * Servlet context.

      */

     private final transient ServletContext ctx;

     /**

      * Ctor.

      * @param context Context

      */

     public ServletMfs(final ServletContext context) {

         this.ctx = context;

     }

     @Override

     public Collection<InputStream> fetch() throws IOException {

         final URL main = this.ctx.getResource("/META-INF/MANIFEST.MF");

         final Collection<InputStream> streams = new ArrayList<InputStream>(1);

         if (main == null) {

             Logger.warn(this, "MANIFEST.MF not found in WAR package");

         } else {

             streams.add(main.openStream());

         }

         return streams;

     }

 }