Package org.jinq.jpa.jpqlquery

Examples of org.jinq.jpa.jpqlquery.Expression

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      if (!query.isSelectFromWhere()) return false;
      SelectFromWhere<?> sfw = (SelectFromWhere<?>)query;
      if (sfw.where != null) return false;
      if (sfw.froms.size() != 1) return false;
      if (!sfw.cols.isSingleColumn()) return false;
      Expression expr = sfw.cols.getOnlyColumn();
      if (!(expr instanceof FromAliasExpression)) return false;
      if (((FromAliasExpression)expr).from != sfw.froms.get(0)) return false;
      return true;     
   }
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   {
      try  {
         if (query.isSelectFromWhere())
         {
            SelectFromWhere<V> sfw = (SelectFromWhere<V>)query;
            Expression methodExpr = computeWhereReturnExpr(where, sfw, parentArgumentScope);
           
            // Create the new query, merging in the analysis of the method
            SelectFromWhere<U> toReturn = (SelectFromWhere<U>)sfw.shallowCopy();
            if (sfw.where == null)
               toReturn.where = methodExpr;
            else
               toReturn.where = new BinaryExpression("AND", sfw.where, methodExpr);
            return toReturn;
         }
         else if (query.isSelectFromWhereGroupHaving())
         {
            GroupedSelectFromWhere<V, ?> sfw = (GroupedSelectFromWhere<V, ?>)query;
            Expression methodExpr = computeWhereReturnExpr(where, sfw, parentArgumentScope);
           
            // Create the new query, merging in the analysis of the method
            GroupedSelectFromWhere<U, ?> toReturn = (GroupedSelectFromWhere<U, ?>)sfw.shallowCopy();
            if (sfw.having == null)
               toReturn.having = methodExpr;
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   private <V> Expression computeWhereReturnExpr(LambdaAnalysis where,
         SelectFromWhere<V> sfw, SymbExArgumentHandler parentArgumentScope) throws TypedValueVisitorException,
         QueryTransformException
   {
      SymbExToColumns translator = config.newSymbExToColumns(SelectFromWhereLambdaArgumentHandler.fromSelectFromWhere(sfw, where, config.metamodel, parentArgumentScope, withSource));
      Expression methodExpr = null;
      for (int n = 0; n < where.symbolicAnalysis.paths.size(); n++)
      {
         PathAnalysis path = where.symbolicAnalysis.paths.get(n);

         TypedValue returnVal = PathAnalysisSimplifier
               .simplifyBoolean(path.getReturnValue(), config.getComparisonMethods());
         SymbExPassDown returnPassdown = SymbExPassDown.with(null, true);
         ColumnExpressions<?> returnColumns = returnVal.visit(translator, returnPassdown);
         if (!returnColumns.isSingleColumn())
            throw new QueryTransformException("Expecting single column");
         Expression returnExpr = returnColumns.getOnlyColumn();

         if (returnVal instanceof ConstantValue.BooleanConstant)
         {
            if (((ConstantValue.BooleanConstant)returnVal).val)
            {
               // This path returns true, so it's redundant to actually
               // put true into the final code.
               returnExpr = null;
            }
            else
            {
               // This path returns false, so we can ignore it
               continue;
            }
         }
        
         // Handle where path conditions
         Expression conditionExpr = pathConditionsToExpr(translator, path);
        
         // Merge path conditions and return value to create a value for the path
         Expression pathExpr = returnExpr;
         if (conditionExpr != null)
         {
            if (pathExpr == null)
               pathExpr = conditionExpr;
            else
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            ColumnExpressions<?> nLinkBase = val.base.visit(translator, passdown);
            // Traverse the chain, it should be a FromAlias at its base with
            // possible field accesses around it
            if (nLinkBase.isSingleColumn())
            {
               Expression expr = nLinkBase.getOnlyColumn();
               if (!(expr instanceof FromAliasExpression
                     || expr instanceof ReadFieldExpression))
                  return null;
            }
           
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               throw new TypedValueVisitorException("Unexpected use of StringBuilder");
         }
        
         if (concatenatedStrings.size() == 1)
            return concatenatedStrings.get(0);
         Expression head = concatenatedStrings.get(concatenatedStrings.size() - 1).getOnlyColumn();
         for (int n = concatenatedStrings.size() - 2; n >= 0 ; n--)
            head = FunctionExpression.twoParam("CONCAT", head, concatenatedStrings.get(n).getOnlyColumn());
         return ColumnExpressions.singleColumn(new SimpleRowReader<>(), head);
      }
      else
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   {
      try  {
         if (query.isSelectFromWhere() || query instanceof SelectOnly)
         {
            SelectOnly<V> select = (SelectOnly<V>)query;
            Expression aggregatedExpr = null;
            SymbExArgumentHandler argumentHandler;
            if (type != AggregateType.COUNT)
            {
               if (select.isDistinct)
               {
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   private boolean isLeftOuterJoinCompatible(SelectFromWhere<?> toMerge)
   {
      From from = toMerge.froms.get(0);
      if (!(from instanceof From.FromNavigationalLinks))
         return false;
      Expression navLink = ((From.FromNavigationalLinks)from).links;
      while (!(navLink instanceof FromAliasExpression))
      {
         if (!(navLink instanceof ReadFieldExpression))
            return false;
         navLink = ((ReadFieldExpression)navLink).base;
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   }

   protected Expression pathConditionsToExpr(SymbExToColumns translator,
         PathAnalysis path) throws TypedValueVisitorException
   {
      Expression conditionExpr = null;
      for (TypedValue cmp: path.getConditions())
      {
         SymbExPassDown passdown = SymbExPassDown.with(null, true);
         ColumnExpressions<?> col = cmp.visit(translator, passdown);
         if (!col.isSingleColumn())
            throw new TypedValueVisitorException("Expecting a single column result for path condition");
         Expression expr = col.getOnlyColumn();
         if (conditionExpr != null)
            conditionExpr = new BinaryExpression("AND", conditionExpr, expr);
         else
            conditionExpr = expr;
      }
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               throw new TypedValueVisitorException("Unexpected use of StringBuilder");
         }
        
         if (concatenatedStrings.size() == 1)
            return concatenatedStrings.get(0);
         Expression head = concatenatedStrings.get(concatenatedStrings.size() - 1).getOnlyColumn();
         for (int n = concatenatedStrings.size() - 2; n >= 0 ; n--)
            head = FunctionExpression.twoParam("CONCAT", head, concatenatedStrings.get(n).getOnlyColumn());
         return ColumnExpressions.singleColumn(new SimpleRowReader<>(), head);
      }
      else
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Related Classes of org.jinq.jpa.jpqlquery.Expression

  • org.jinq.jpa.transform.AggregateTransform
  • org.jinq.jpa.transform.JoinTransform
  • org.jinq.jpa.transform.JPQLQueryTransform
  • org.jinq.jpa.transform.OuterJoinTransform
  • org.jinq.jpa.transform.ScalaSymbExToColumns
  • org.jinq.jpa.transform.SymbExToColumns
  • org.jinq.jpa.transform.SymbExToSubQuery
  • org.jinq.jpa.transform.WhereTransform
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