/*

  * 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");

         }

     }

 }