/*
    * 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 OctaveCelll.html#OctaveCell">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;
      }
  
  }