/*

  * $Source$

  * $Revision$

  *

  * Copyright (C) 2000 Myles Chippendale

  *

  * Part of Melati (http://melati.org), a framework for the rapid

  * development of clean, maintainable web applications.

  *

  * Melati is free software; Permission is granted to copy, distribute

  * and/or modify this software under the terms either:

  *

  * a) the GNU General Public License as published by the Free Software

  *    Foundation; either version 2 of the License, or (at your option)

  *    any later version,

  *

  *    or

  *

  * b) any version of the Melati Software License, as published

  *    at http://melati.org

  *

  * You should have received a copy of the GNU General Public License and

  * the Melati Software License along with this program;

  * if not, write to the Free Software Foundation, Inc.,

  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA to obtain the

  * GNU General Public License and visit http://melati.org to obtain the

  * Melati Software License.

  *

  * Feel free to contact the Developers of Melati (http://melati.org),

  * if you would like to work out a different arrangement than the options

  * outlined here.  It is our intention to allow Melati to be used by as

  * wide an audience as possible.

  *

  * 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 General Public License for more details.

  *

  * Contact details for copyright holder:

  *

  *     Mylesc Chippendale <mylesc At paneris.org>

  *     http://paneris.org/

  *     29 Stanley Road, Oxford, OX4 1QY, UK

  */

 package org.melati.servlet;

 import java.io.File;

 import java.io.ByteArrayOutputStream;

 import java.io.IOException;

 import org.melati.util.DelimitedBufferedInputStream;

 /**

  * Store the uploaded data in a byte array in memory.

  */

 public class MemoryFormDataAdaptor implements FormDataAdaptor {

   /** Size for byte buffers */

   protected int BUFSIZE = 512;

   private byte[] data = new byte[0];

   /**

    * Return the data as a byte array.

    * @return the data as a byte array

    */

   public byte[] getData() {

     return data;

   }

   /**

    * Return the size of the data.

    * @return the size of the data

    */

   public long getSize() {

     return data.length;

   }

   /**

    * Return a File object pointing to the saved data (if one exists).

    * @return always <code>null</code>

    */

   public File getFile() {

     return null;

   }

   /**

    * Return a url to the object.

    * @return always null

    */

   public String getURL() {

     return null;

   }

   /**

    * Read data from in until the delim and save it

    * in an internal buffer for later use.

    *

    * @param field   a {@link MultipartFormField} to be read

    * @param in      a {@link DelimitedBufferedInputStream} to read from

    * @param delim   the delimitor to differentiate elements

    * @throws IOException if there is a problem reading the input 

    */

   public void readData(MultipartFormField field,

                        DelimitedBufferedInputStream in,

                        byte[] delim) 

       throws IOException {

     ByteArrayOutputStream out = new ByteArrayOutputStream();

     byte[] buff = new byte[BUFSIZE];

     int count;

     try {

       while ((count = in.readToDelimiter(buff, 0, buff.length, delim)) > 0)

         out.write(buff, 0, count);

       if (count == -1)

         throw new IOException(

                       "Didn't find boundary whilst reading field data");

       data = out.toByteArray();

     }

     catch (IOException e) {

       throw e;

     }

     finally {

       try {

         out.close();

         out = null;

       }

       catch (Exception e) {

         // Thrown above

         e = null; // shut PMD up

       }

     }

   }

 }