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   *  distributed with this work for additional information
   *  regarding copyright ownership.  The ASF licenses this file
   *  to you under the Apache License, Version 2.0 (the
   *  "License"); you may not use this file except in compliance
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   *
   *    https://www.apache.org/licenses/LICENSE-2.0
   *
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  package org.apache.cayenne.access.translator.ejbql;
  
  import org.apache.cayenne.ejbql.EJBQLBaseVisitor;
  import org.apache.cayenne.ejbql.EJBQLExpression;
  
  /**
   * A translator of EJBQL UPDATE statements into SQL.
   * 
   * @since 3.0
   */
  class EJBQLUpdateTranslator extends EJBQLBaseVisitor {
  
      private EJBQLTranslationContext context;
      private int itemCount;
  
      EJBQLUpdateTranslator(EJBQLTranslationContext context) {
          this.context = context;
      }
  
      EJBQLTranslationContext getContext() {
          return context;
      }
  
      @Override
      public boolean visitUpdate(EJBQLExpression expression) {
          context.append("UPDATE");
          return true;
      }
  
      @Override
      public boolean visitWhere(EJBQLExpression expression) {
          context.append(" WHERE");
          expression.visit(context.getTranslatorFactory().getConditionTranslator(context));
          return false;
      }
  
      @Override
      public boolean visitFrom(EJBQLExpression expression, int finishedChildIndex) {
          expression.visit(context.getTranslatorFactory().getFromTranslator(context));
  
          return false;
      }
  
      @Override
      public boolean visitUpdateItem(EJBQLExpression expression, int finishedChildIndex) {
          if (itemCount++ > 0) {
              context.append(',');
          }
          else {
              context.append(" SET");
          }
  
          expression.visit(context.getTranslatorFactory().getUpdateItemTranslator(context));
          return false;
      }
  }
  