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   *  regarding copyright ownership.  The ASF licenses this file
   *  to you under the Apache License, Version 2.0 (the
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  package org.apache.cayenne.dba.mysql;
  
  import org.apache.cayenne.access.translator.ejbql.EJBQLConditionTranslator;
  import org.apache.cayenne.access.translator.ejbql.EJBQLTranslationContext;
  import org.apache.cayenne.ejbql.EJBQLExpression;
  
  /**
   * Customizes EJBQL conditions translation for MySQL.
   * 
   * @since 3.0
   */
  class MySQLEJBQLConditionTranslator extends EJBQLConditionTranslator {
  
      MySQLEJBQLConditionTranslator(EJBQLTranslationContext context) {
          super(context);
      }
  
      @Override
      public boolean visitTrim(EJBQLExpression expression, int finishedChildIndex) {
          if (finishedChildIndex < 0) {
              context.append(" TRIM(");
          }
          else if (finishedChildIndex + 2 == expression.getChildrenCount()) {
              context.append(" FROM");
          }
          else if (finishedChildIndex + 1 == expression.getChildrenCount()) {
              context.append(")");
          }
  
          return true;
      }
  
      @Override
      public boolean visitTrimCharacter(EJBQLExpression expression) {
          context.append(' ').append(expression.getText());
          return false;
      }
  
      @Override
      public boolean visitTrimLeading(EJBQLExpression expression) {
          context.append("LEADING");
          return false;
      }
  
      @Override
      public boolean visitTrimTrailing(EJBQLExpression expression) {
          context.append("TRAILING");
          return false;
      }
  
      @Override
      public boolean visitTrimBoth(EJBQLExpression expression) {
          context.append("BOTH");
          return false;
      }
      
      @Override
      public boolean visitLike(EJBQLExpression expression, int finishedChildIndex) {
          if (finishedChildIndex == 0) {
              if (checkNullParameter(expression, " IS NULL")) {
                  return false;
              }
              
              if (expression.isNegated()) {
                  context.append(" NOT");
              }
              context.append(" LIKE");
              
              if (context.isCaseInsensitive()) {
                  context.append(" BINARY");
              }
          }
  
          return true;
      }
  }
  