package com.hfg.xml;

import java.io.OutputStream;
import java.io.Writer;
import java.io.IOException;

import com.hfg.exception.ProgrammingException;

//------------------------------------------------------------------------------
/**
 * Represents a CDATA block.
 *
 * @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
// jataylor@hairyfatguy.com
//------------------------------------------------------------------------------

/*
For XHTML or XML the script should be escaped like so:
<script>
 <![CDATA[
 ... unescaped script content ...
 ]]>
 </script>

 However, older browser (such as IE5 on Mac) won't take kindly to this.
 IE6 doesn't seem to like such escaping in returned AJAX content.

 See  http://www.sitepoint.com/forums/showthread.php?p=1955911
 or this extracted page:  http://web-development.tuljo.com/cdata-comments.html

*/
public class XMLCDATA implements XMLizable
{
   private String mContent;
   private boolean mHideWithCommentsForLegacyBrowsers;

   private static boolean sDefaultHideWithCommentsForLegacyBrowsers = false;

   //##########################################################################
   // CONSTRUCTORS
   //##########################################################################

   //--------------------------------------------------------------------------
   public XMLCDATA()
   {
      mHideWithCommentsForLegacyBrowsers = sDefaultHideWithCommentsForLegacyBrowsers;
   }

   //--------------------------------------------------------------------------
   public XMLCDATA(String inContent)
   {
      this();
      mContent = inContent;
   }

   //##########################################################################
   // PUBLIC METHODS
   //##########################################################################

   //---------------------------------------------------------------------------
   public XMLCDATA clone()
   {
      XMLCDATA cloneObj;
      try
      {
         cloneObj = (XMLCDATA) super.clone();
      }
      catch (CloneNotSupportedException e)
      {
         throw new ProgrammingException(e);
      }

      return cloneObj;
   }

   //---------------------------------------------------------------------------
   public static void setDefaultHideWithCommentsForLegacyBrowsers(boolean inValue)
   {
      sDefaultHideWithCommentsForLegacyBrowsers = inValue;
   }


   //---------------------------------------------------------------------------
   public static boolean getDefaultHideWithCommentsForLegacyBrowsers()
   {
      return sDefaultHideWithCommentsForLegacyBrowsers;
   }


   //---------------------------------------------------------------------------

   /**
    * Sets whether or not to 'hide' the CDATA structure from browsers that are too
    * old to support it. This is done by adding '//&gt;&lt;!--\n' and '\n//--&gt;&lt;!' inside
    * the CDATA.
    * For a discussion of where this syntax comes from, see
    * <a href='http://web-development.tuljo.com/cdata-comments.html'>this discussion</a>.
    */
   public XMLCDATA setHideWithCommentsForLegacyBrowsers(boolean inValue)
   {
      mHideWithCommentsForLegacyBrowsers = inValue;
      return this;
   }


   //---------------------------------------------------------------------------
   public boolean getHideWithCommentsForLegacyBrowsers()
   {
      return mHideWithCommentsForLegacyBrowsers;
   }

   //---------------------------------------------------------------------------
   public boolean hasContent()
   {
      return true;
   }


   //---------------------------------------------------------------------------
   public void setContent(CharSequence inContent)
   {
      clearContent();

      addContent(inContent);
   }

   //---------------------------------------------------------------------------
   /**
    Clears content (not subtags).
    */
   public void clearContent()
   {
      mContent = null;
   }

   //---------------------------------------------------------------------------
   public void addContent(CharSequence inContent)
   {
      if (inContent != null)
      {
         if (mContent != null)
         {
            mContent += inContent;
         }
         else
         {
            mContent = inContent.toString();
         }
      }
   }

   //---------------------------------------------------------------------------
   /**
    The returned content does not contain any embedded subtags.
    */
   public String getContent()
   {
      return mContent;
   }

   //---------------------------------------------------------------------------
   public String toXML()
   {
//      return "<![CDATA[//><!--\n" + mContent + "\n//--><!]]>";

      StringBuilder buffer = new StringBuilder(mContent != null ? mContent.length() : 30);
      buffer.append("<![CDATA[");
      if (mHideWithCommentsForLegacyBrowsers) buffer.append("//><!--\n");
      if (mContent != null) buffer.append(mContent);
      if (mHideWithCommentsForLegacyBrowsers) buffer.append("\n//--><!");
      buffer.append("]]>");

      return buffer.toString();
   }

   //---------------------------------------------------------------------------
   public void toXML(Writer inWriter)
   {
      try
      {
         inWriter.write(toXML());
      }
      catch (IOException e)
      {
         throw new RuntimeException(e);
      }
   }

   //---------------------------------------------------------------------------
   public void toXML(OutputStream inStream)
   {
      try
      {
         inStream.write(toXML().getBytes());
      }
      catch (Exception e)
      {
         throw new XMLException(e);
      }
   }



   //--------------------------------------------------------------------------
   public String toIndentedXML(int inInitialIndentLevel, int inIndentSize)
   {
      return toXML();
   }

   //--------------------------------------------------------------------------
   public void toIndentedXML(OutputStream inOutputStream, int inInitialIndentLevel, int inIndentSize)
   {
      toXML(inOutputStream);
   }

   //--------------------------------------------------------------------------
   public void toIndentedXML(Writer inWriter, int inInitialIndentLevel, int inIndentSize)
   {
      toXML(inWriter);
   }
}