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

import com.hfg.sql.jdbc.JDBCException;
import com.hfg.util.StringBuilderPlus;
import com.hfg.util.collection.CollectionUtil;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

//------------------------------------------------------------------------------
/**
 Base class for SQL commands.
 
 @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 SQLCmd
{
   private SQLAndGroup mWhere;
   private List   mOrderByList;


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

   //---------------------------------------------------------------------------
   public SQLCmd addClauses(Collection inClauses)
   {
      if (CollectionUtil.hasValues(inClauses))
      {
         for (SQLClause clause : inClauses)
         {
            addClause(clause);
         }
      }

      return this;
   }

   //---------------------------------------------------------------------------
   public SQLCmd addClause(SQLClause inValue)
   {
      switch (inValue.getType())
      {
         case WHERE:
            if (null == mWhere)
            {
               mWhere = new SQLAndGroup();
            }
            mWhere.add((WhereClause)inValue);
            break;
         case ORDER_BY:
            if (null == mOrderByList)
            {
               mOrderByList = new ArrayList<>(5);
            }
            mOrderByList.add(inValue);
            break;
         default:
            throw new JDBCException("Unrecognized SQL clause type!");
      }

      return this;
   }

   //---------------------------------------------------------------------------
   public SQLCmd addWhereClauseGroup(WhereClauseGroup inValue)
   {
      if (null == mWhere)
      {
         mWhere = new SQLAndGroup();
      }

      mWhere.add(inValue);

      return this;
   }

   //---------------------------------------------------------------------------
   protected String generateWhereClause()
   {
      StringBuilderPlus sql = new StringBuilderPlus().setDelimiter("\n  AND ");

      if (mWhere != null)
      {
         sql.append("WHERE ");
         sql.append(mWhere.toSQL());
         sql.appendln();
      }

      return sql.toString();
   }

   //---------------------------------------------------------------------------
   protected String generateOrderByClause()
   {
      StringBuilderPlus sql = new StringBuilderPlus().setDelimiter(", ");
      if (mOrderByList != null)
      {
         for (SQLClause clause : mOrderByList)
         {
            sql.delimitedAppend(clause.toSQL());
         }

         sql.insert(0, "ORDER BY ");
         sql.appendln();
      }

      return sql.toString();
   }
}