/*
    * Copyright 2008, 2009 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.IOException;
  import java.io.Writer;
  import java.util.Map;
  
  import eu.simuline.octave.io.OctaveIO;
  import eu.simuline.octave.io.spi.OctaveDataWriter;
  import eu.simuline.octave.type.OctaveObject;
  import eu.simuline.octave.type.OctaveStruct;
  
  // import static eu.simuline.octave.io.impl.CellWriter.NROWS;
  // import static eu.simuline.octave.io.impl.CellWriter.NCOLUMNS;
  
  /**
   * The writer for the octave type "struct" 
   * writing an {@link OctaveStruct} to a {@link Writer}. 
   *
   * The format is 
   * <pre>
   * # type: struct\n
   * # length: ...\n
   * // comment: the following is in a loop of given length 
   * </pre>
   */
  public final class StructWriter extends OctaveDataWriter<OctaveStruct> {
      static final String LENGTH = "# length: ";
      static final String NAME   = "# name: ";
  
      static final String TYPE_CELL = "# type: cell";
  
      @Override
      public Class<OctaveStruct> javaType() {
          return OctaveStruct.class;
      }
  
      @Override
      public void write(final Writer writer,
  		      final OctaveStruct octaveStruct) throws IOException {
          writer.write("# type: struct\n");
          final Map<String, OctaveObject> data = octaveStruct.getData();
          writer.write(LENGTH + data.size() + "\n");
          for (final Map.Entry<String, OctaveObject> entry : data.entrySet()) {
              final String subname = entry.getKey();
              final OctaveObject value = entry.getValue();
              writer.write(NAME + subname + "\n");
  
  	    // **** what follows seems to correspond with CellReader 
              writer.write(TYPE_CELL + "\n");
  //            writer.write("# type: cell\n");
              writer.write("# rows: " + 1 + "\n");
              writer.write("# columns: " + 1 + "\n");
              OctaveIO.write(writer, "<cell-element>", value);
              writer.write("\n");
          }
      }
  
  }