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com.hfg xml, html, svg, and bioinformatics utility library
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package com.hfg.svg.path;

import com.hfg.exception.ProgrammingException;
import com.hfg.util.StringBuilderPlus;
import com.hfg.util.collection.CollectionUtil;

import java.awt.geom.Path2D;
import java.awt.geom.Point2D;
import java.lang.reflect.Constructor;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

//------------------------------------------------------------------------------
/**
 * Base representation of an SVG (Scalable Vector Graphics) path command.
 *
 * @author J. Alex Taylor, hairyfatguy.com
 */
//------------------------------------------------------------------------------
// com.hfg XML/HTML Coding Library
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//
// J. Alex Taylor, President, Founder, CEO, COO, CFO, OOPS hairyfatguy.com
// [email protected]
//------------------------------------------------------------------------------

public abstract class SvgPathCmd
{
   private char            mCmdChar;
   private List     mRawNumbers;
   private boolean         mIsRelative;
   private Point2D.Float   mStartingPoint;
   private int             mNumSteps;

   private static Map sCmdMap = new HashMap<>(25);

   static
   {
      try
      {
         sCmdMap.put('A', SvgPathEllipticalArcCmd.class.getConstructor());
         sCmdMap.put('C', SvgPathCurveToCmd.class.getConstructor());
         sCmdMap.put('H', SvgPathHorizLineToCmd.class.getConstructor());
         sCmdMap.put('L', SvgPathLineToCmd.class.getConstructor());
         sCmdMap.put('M', SvgPathMoveToCmd.class.getConstructor());
         sCmdMap.put('Q', SvgPathQuadCurveToCmd.class.getConstructor());
         sCmdMap.put('S', SvgPathSmoothCurveToCmd.class.getConstructor());
         sCmdMap.put('T', SvgPathSmoothQuadCurveToCmd.class.getConstructor());
         sCmdMap.put('V', SvgPathVertLineToCmd.class.getConstructor());
         sCmdMap.put('Z', SvgPathClosePathCmd.class.getConstructor());
      }
      catch (NoSuchMethodException e)
      {
         throw new ProgrammingException(e);
      }
   }

   //---------------------------------------------------------------------------
   protected SvgPathCmd(char inCmdChar)
   {
      mCmdChar = inCmdChar;
   }

   //---------------------------------------------------------------------------
   public static SvgPathCmd allocate(char inCmdChar)
   {
      SvgPathCmd pathCmd = null;

      Constructor cmdClassConstructor = sCmdMap.get(Character.toUpperCase(inCmdChar));
      if (cmdClassConstructor != null)
      {
         try
         {
            pathCmd = (SvgPathCmd) cmdClassConstructor.newInstance();
         }
         catch (Exception e)
         {
            throw new ProgrammingException(e);
         }

         if (Character.isLowerCase(inCmdChar))
         {
            pathCmd.mIsRelative = true;
         }
      }

      return pathCmd;
   }

   //---------------------------------------------------------------------------
   public char getCmdChar()
   {
      return (mIsRelative ? Character.toLowerCase(mCmdChar) : mCmdChar);
   }

   //---------------------------------------------------------------------------
   public SvgPathCmd setIsRelative(boolean inValue)
   {
      mIsRelative = inValue;
      return this;
   }

   //---------------------------------------------------------------------------
   public boolean isRelative()
   {
      return mIsRelative;
   }

   //---------------------------------------------------------------------------
   public SvgPathCmd setRawNumbers(List inValue)
   {
      mRawNumbers = (inValue != null ? new ArrayList<>(inValue) : null);
      return this;
   }

   //---------------------------------------------------------------------------
   public List getRawNumbers()
   {
      return mRawNumbers;
   }

   //---------------------------------------------------------------------------
   public SvgPathCmd setStartingPoint(Point2D.Float inValue)
   {
      mStartingPoint = inValue;
      return this;
   }

   //---------------------------------------------------------------------------
   public Point2D.Float getStartingPoint()
   {
      return mStartingPoint;
   }

   //---------------------------------------------------------------------------
   protected SvgPathCmd setNumSteps(int inValue)
   {
      mNumSteps = inValue;
      return this;
   }

   //---------------------------------------------------------------------------
   public int getNumSteps()
   {
      return mNumSteps;
   }

   //---------------------------------------------------------------------------
   public abstract Point2D.Float draw(Path2D.Float inPolyline);

   //---------------------------------------------------------------------------
   @Override
   public String toString()
   {
      StringBuilderPlus buffer = new StringBuilderPlus().setDelimiter(" ");
      if (CollectionUtil.hasValues(mRawNumbers))
      {
         for (Float num : mRawNumbers)
         {
            buffer.delimitedAppend(num.floatValue() == num.intValue() ? num.intValue() + "" : num + "");
         }
      }

      buffer.insert(0, getCmdChar());

      return buffer.toString();
   }
}