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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.firebird;
  
  import org.apache.cayenne.access.translator.ejbql.EJBQLConditionTranslator;
  import org.apache.cayenne.access.translator.ejbql.EJBQLTranslationContext;
  import org.apache.cayenne.ejbql.EJBQLExpression;
  import org.apache.cayenne.ejbql.parser.EJBQLTrimSpecification;
  
  /**
   * @since 4.0
   */
  public class FirebirdEJBQLConditionTranslator extends EJBQLConditionTranslator {
  
      public FirebirdEJBQLConditionTranslator(EJBQLTranslationContext context) {
          super(context);
      }
  
      @Override
      public boolean visitTrim(EJBQLExpression expression, int finishedChildIndex) {
          if (finishedChildIndex < 0) {
              if (!(expression.getChild(0) instanceof EJBQLTrimSpecification)) {
                  context.append(" {fn TRIM(");
              }
          } else if (finishedChildIndex + 1 == expression.getChildrenCount()) {
              context.append(")}");
          }
  
          return true;
      }
  
      @Override
      public boolean visitTrimLeading(EJBQLExpression expression) {
          context.append(" {fn TRIM(LEADING FROM ");
          return false;
      }
  
      @Override
      public boolean visitTrimTrailing(EJBQLExpression expression) {
          context.append(" {fn TRIM(TRAILING FROM ");
          return false;
      }
  
      @Override
      public boolean visitTrimBoth(EJBQLExpression expression) {
          context.append(" {fn TRIM(");
          return false;
      }
  
      @Override
      public boolean visitLower(EJBQLExpression expression, int finishedChildIndex) {
          if (finishedChildIndex < 0) {
              context.append(" {fn LOWER(");
              return true;
          } else {
              return super.visitLower(expression, finishedChildIndex);
          }
      }
  
      @Override
      public boolean visitLocate(EJBQLExpression expression, int finishedChildIndex) {
          if (finishedChildIndex < 0) {
              context.append(" {fn POSITION(");
              return true;
          } else {
              return super.visitLocate(expression, finishedChildIndex);
          }
      }
  
      @Override
      public boolean visitSubstring(EJBQLExpression expression, int finishedChildIndex) {
          if (finishedChildIndex < 0) {
              context.append(" SUBSTRING(");
          } else {
              if (finishedChildIndex + 1 == expression.getChildrenCount()) {
                  context.append(" AS INTEGER))");
              } else {
                  if(finishedChildIndex == 0) {
                      context.append(" FROM CAST(");
                  } else if(finishedChildIndex == 1) {
                      context.append(" AS INTEGER) FOR CAST(");
                  }
              }
          }
  
          return true;
      }
  }
  