/*

  * Copyright 2007, 2008 Ange Optimization ApS

  *

  * Licensed under the Apache License, Version 2.0 (the "License");

  * you may not use this file except in compliance with the License.

  * You may obtain a copy of the License at

  *

  *     http://www.apache.org/licenses/LICENSE-2.0

  *

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  * See the License for the specific language governing permissions and

  * limitations under the License.

  */

 /**

  * @author Kim Hansen

  */

 package eu.simuline.octave.util;

 import java.io.IOException;

 import java.io.Reader;

 import java.io.Writer;

 /**

  * Class for holding static utility functions for readers and writers: 

  * copy from reader to writer. 

  * 

  * @author Kim Hansen

  */

 public final class IOUtils {

     private static final int BUFFER_SIZE = 8 * 1024;

     private IOUtils() {

         throw new UnsupportedOperationException("Do not instantiate");

     }

     /**

      * @param reader

      * @param writer

      * @return The total chars copied

      * @throws IOException

      */

     public static long copy(final Reader reader, 

                             final Writer writer) throws IOException {

         final char[] buffer = new char[BUFFER_SIZE];

         long total = 0;

         while (true) {

             final int charsRead = reader.read(buffer, 0, BUFFER_SIZE);

             if (charsRead == -1) {

                 break;

             }

             total += charsRead;

             writer.write(buffer, 0, charsRead);

         }

         writer.flush();

         return total;

     }

 }