/**********************************************
    * Copyright (C) 2011 Lukas Laag
    * This file is part of svgreal.
    * 
    * svgreal is free software: you can redistribute it and/or modify
    * it under the terms of the GNU General Public License as published by
    * the Free Software Foundation, either version 3 of the License, or
    * (at your option) any later version.
    * 
   * svgreal is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   * 
   * You should have received a copy of the GNU General Public License
   * along with svgreal.  If not, see http://www.gnu.org/licenses/
   **********************************************/
  package org.vectomatic.svg.edit.client.model;
  
  import org.vectomatic.dom.svg.OMSVGLength;
  import org.vectomatic.dom.svg.OMSVGPaint;
  import org.vectomatic.dom.svg.OMSVGSVGElement;
  import org.vectomatic.dom.svg.utils.OMSVGParser;
  import org.vectomatic.svg.edit.client.model.svg.DashArray;
  import org.vectomatic.svg.edit.client.model.svg.SVGLength;
  
  /**
   * Interface to convert a data type into another.
   * @param S
   * The source data type
   * @param D
   * The destination data type
   * @author laaglu
   */
  public interface IConverter<S,D> {
  	public static final IConverter<String, String> NOP_CONVERTER = new IConverter<String, String> () {
  		@Override
  		public String sourceToDest(String source) {
  			return source;
  		}
  		@Override
  		public String destToSource(String dest) {
  			return dest;
  		}
  	};
  	public static final IConverter<String, Float> STRING_FLOAT_CONVERTER = new IConverter<String, Float> () {
  		@Override
  		public Float sourceToDest(String source) {
  			return (source != null && source.length() > 0) ? Float.parseFloat(source) : null;
  		}
  		@Override
  		public String destToSource(Float dest) {
  			return dest != null ? Float.toString(dest) : null;
  		}
  	};
  	public static final IConverter<String, Double> STRING_DOUBLE_CONVERTER = new IConverter<String, Double> () {
  		@Override
  		public Double sourceToDest(String source) {
  			return (source != null && source.length() > 0) ? Double.parseDouble(source) : null;
  		}
  		@Override
  		public String destToSource(Double dest) {
  			return dest != null ? Double.toString(dest) : null;
  		}
  	};
  	public static final IConverter<String, OMSVGPaint> STRING_SVGPAINT_CONVERTER = new IConverter<String, OMSVGPaint> () {
  		@Override
  		public OMSVGPaint sourceToDest(String source) {
  			return (source != null && source.length() > 0) ? OMSVGParser.parsePaint(source) : null;
  		}
  		@Override
  		public String destToSource(OMSVGPaint dest) {
  			return dest != null ? dest.getCssText() : null;
  		}
  	};
  	public static final IConverter<String, DashArray> STRING_DASHARRAY_CONVERTER = new IConverter<String, DashArray> () {
  		@Override
  		public DashArray sourceToDest(String source) {
  			return (source != null && source.length() > 0) ? DashArray.parse(source) : null;
  		}
  
  		@Override
  		public String destToSource(DashArray dest) {
  			return dest != null ? dest.toString() : null;
  		}
  		
  	};
  	public static final IConverter<String, SVGLength> STRING_LENGTH_CONVERTER = new IConverter<String, SVGLength> () {
  		private OMSVGSVGElement svg = OMSVGParser.currentDocument().createSVGSVGElement();
  		@Override
  		public SVGLength sourceToDest(String source) {
  			if (source != null) {
  				OMSVGLength l = svg.createSVGLength();
  				l.setValueAsString(source);
  				return new SVGLength(l);
  			}
  			return null;
  		}
  
 		@Override
 		public String destToSource(SVGLength dest) {
 			return dest != null ? dest.toString() : null;
 		}
 		
 	};
 	public D sourceToDest(S source);
 	public S destToSource(D dest);
 }