/*

  * Copyright 2008, 2012 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.

  */

 package eu.simuline.octave.io.impl;

 import java.io.BufferedReader;

 import eu.simuline.octave.exception.OctaveParseException;

 import eu.simuline.octave.io.OctaveIO;

 import eu.simuline.octave.io.spi.OctaveDataReader;

 import eu.simuline.octave.type.OctaveCell;

 import eu.simuline.octave.type.OctaveObject;

 //import static eu.simuline.octave.io.impl.CellWriter.TYPE_CELL;

 import static eu.simuline.octave.io.impl.CellWriter.NROWS;

 import static eu.simuline.octave.io.impl.CellWriter.NCOLUMNS;

 /**

  * The reader for the octave type "cell" 

  * reading in an {@link OctaveCell} from a {@link BufferedReader}. 

  */

 public final class CellReader extends OctaveDataReader {

     @Override

     public String octaveType() {

         return "cell";

     }

     @Override

     public OctaveCell read(final BufferedReader reader) {

         String line = OctaveIO.readerReadLine(reader);

         String token = NROWS;

         if (!line.startsWith(token)) {

             throw new OctaveParseException

                 ("Expected <" + token + ">, but got <" + line + ">");

         }

         final int nrows = Integer.parseInt(line.substring(token.length()));

         line = OctaveIO.readerReadLine(reader);

         token = NCOLUMNS;

         if (!line.startsWith(token)) {

             throw new OctaveParseException

                 ("Expected <" + token + ">, but got <" + line + ">");

         }

         final int ncols = Integer.parseInt(line.substring(token.length()));

         final OctaveCell octaveCell = new OctaveCell(nrows, ncols);

         for (int col = 1; col <= ncols; col++) {

             for (int row = 1; row <= nrows; row++) {

                 // Work around differences in number of line feeds 

                 // in octave 3.4 and 3.6: 

                 // keep reading until line is non-empty

                 do {

                     line = OctaveIO.readerReadLine(reader);

                 } while ("".equals(line));

                 token = "# name: <cell-element>";

                 if (!line.equals(token)) {

                     throw new OctaveParseException

                         ("Expected <" + token + ">, but got <" + line + ">");

                 }

                 final OctaveObject octaveType = OctaveIO.read(reader);

                 octaveCell.set(octaveType, row, col);

             }

             line = OctaveIO.readerReadLine(reader);

             token = "";

             if (line == null || !line.equals(token)) {

                 throw new OctaveParseException

                     ("Expected <" + token + ">, but got <" + line + ">");

             }

         }

         return octaveCell;

     }

 }