# TwoURLsResource.java

    /*
    ** Module   : TwoURLsResource.java
    ** Abstract : Merges two Jetty resources into one.
    **
    ** Copyright (c) 2017-2020, Golden Code Development Corporation.
    **
    ** -#- -I- --Date-- ----------------Description----------------------
    ** 001 HC  20170925 Created initial version.
    ** 002 HC  20200313 Javadoc fixes.
    */
    /*
    ** This program is free software: you can redistribute it and/or modify
    ** it under the terms of the GNU Affero General Public License as
    ** published by the Free Software Foundation, either version 3 of the
    ** License, or (at your option) any later version.
    **
    ** This program 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 Affero General Public License for more details.
    **
    ** You may find a copy of the GNU Affero GPL version 3 at the following
    ** location: https://www.gnu.org/licenses/agpl-3.0.en.html
    **
    ** Additional terms under GNU Affero GPL version 3 section 7:
    **
    **   Under Section 7 of the GNU Affero GPL version 3, the following additional
    **   terms apply to the works covered under the License.  These additional terms
    **   are non-permissive additional terms allowed under Section 7 of the GNU
    **   Affero GPL version 3 and may not be removed by you.
    **
    **   0. Attribution Requirement.
    **
    **     You must preserve all legal notices or author attributions in the covered
    **     work or Appropriate Legal Notices displayed by works containing the covered
    **     work.  You may not remove from the covered work any author or developer
    **     credit already included within the covered work.
    **
    **   1. No License To Use Trademarks.
    **
    **     This license does not grant any license or rights to use the trademarks
    **     Golden Code, FWD, any Golden Code or FWD logo, or any other trademarks
    **     of Golden Code Development Corporation. You are not authorized to use the
    **     name Golden Code, FWD, or the names of any author or contributor, for
    **     publicity purposes without written authorization.
    **
    **   2. No Misrepresentation of Affiliation.
    **
    **     You may not represent yourself as Golden Code Development Corporation or FWD.
    **
    **     You may not represent yourself for publicity purposes as associated with
    **     Golden Code Development Corporation, FWD, or any author or contributor to
    **     the covered work, without written authorization.
    **
    **   3. No Misrepresentation of Source or Origin.
    **
    **     You may not represent the covered work as solely your work.  All modified
    **     versions of the covered work must be marked in a reasonable way to make it
    **     clear that the modified work is not originating from Golden Code Development
    **     Corporation or FWD.  All modified versions must contain the notices of
    **     attribution required in this license.
    */
    package com.goldencode.p2j.main;

    import org.eclipse.jetty.util.resource.*;

    import java.io.*;
    import java.net.*;
    import java.nio.channels.*;

    /**
     * Jetty resource implementation that is capable to merge two other resources.
     */
    public class TwoURLsResource
    extends Resource
    {
       /** First resource */
       private Resource res1;

       /** Second resource */
       private Resource res2;

       /**
        * Ctor.
        *
        * @param   res1
        *          First resource.
        * @param   res2
        *          Second resource.
        */
       public TwoURLsResource(Resource res1, Resource res2)
       {
          this.res1 = res1;
          this.res2 = res2;
       }

       /**
        * Closes this stream and releases any system resources associated
        * with it. If the stream is already closed then invoking this
        * method has no effect.
        */
       @Override
       public synchronized void close()
       {
          res1.close();
          res2.close();
       }

       /**
        * Checks whether resource exists.
        *
        * @return  see above
        */
       @Override
       public boolean exists()
       {
          return res1.exists() || res2.exists();
       }

       /**
        * Returns is-directory flag.
        *
        * @return  see above
        */
       @Override
       public boolean isDirectory()
       {
          return res1.isDirectory() || res2.isDirectory();
       }

       /**
        * Returns the last-modified time stamp.
        *
        * @return  see above
        */
       @Override
       public long lastModified()
       {
          return Math.max(res1.lastModified(), res2.lastModified());
       }

       /**
        * Returns the stream byte length.
        *
        * @return  see above
        */
       @Override
       public long length()
       {
          return -1;
       }

       /**
        * Returns resource url.
        *
        * @return  see above
        */
       @Override
       @Deprecated
       public URL getURL()
       {
          return res1.getURL();
       }

       /**
        * Returns resource file.
        *
        * @return  see above
        */
       @Override
       public File getFile()
       {
          return null;
       }

       /**
        * Returns rsource name.
        *
        * @return  see above
        */
       @Override
       public String getName()
       {
          return res1.getName();
       }

       /**
        * Returns resource as stream.
        *
        * @return  see above
        */
       @Override
       public synchronized InputStream getInputStream()
       {
          return null;
       }

       /**
        * Returns resource as {@link ReadableByteChannel}.
        *
        * @return  see above
        */
       @Override
       public ReadableByteChannel getReadableByteChannel()
       {
          return null;
       }

       /**
        * Deletes the resource.
        *
        * @return  {@code true} if delete success
        */
       @Override
       public boolean delete()
       {
          throw new SecurityException("Delete not supported");
       }

       /**
        * Renames resource to another resource.
        *
        * @param   dest
        *          The destination resource.
        *
        * @return  {@code true} if success
        */
       @Override
       public boolean renameTo(Resource dest)
       {
          throw new SecurityException("RenameTo not supported");
       }

       /**
        * Lists the sub resources if any.
        *
        * @return  array of sub resources, if none returns {@code null}
        */
       @Override
       public String[] list()
       {
          return null;
       }

       /**
        * Adds a path to the resource and returns a new resource representing the path addition.
        * The method is immutable.
        *
        * @param   path
        *          The path to add.
        *
        * @return  the new resource representing the result of the operation
        *
        * @throws  IOException
        *          Thrown when the path doesn't exist.
        */
       @Override
       public Resource addPath(String path)
       throws IOException
       {
          Resource res = res1.addPath(path);
          if (res == null || !res.exists())
          {
             res = res2.addPath(path);
          }

          return res;
       }

       /**
        * Returns the string representation.
        *
        * @return  see above
        */
       @Override
       public String toString()
       {
          return res1.toString() + "; " + res2.toString();
       }

       /**
        * Checks whether this resource is contained in the supplied resource.
        *
        * @return  {@code true} if contained, {@code true} otherwise
        */
       @Override
       public boolean isContainedIn (Resource containingResource)
       {
          return false;
       }
    }