Package org.eclipse.persistence.internal.expressions

Class ExpressionNormalizer

  • public class ExpressionNormalizer
extends java.lang.Object
    This is used during the normalization process to allow for a single main expression traversal.

    • Field Detail

      • additionalExpression

        protected Expression additionalExpression
        A new root expression can be made from joins being added to the original expression.

      • subSelectExpressions

        protected java.util.List<SubSelectExpression> subSelectExpressions
        Subselect expressions found in the course of normalization.

      • session

        protected AbstractSession session
        The session being normalized in.

      • clonedExpressions

        protected java.util.Map<Expression,​Expression> clonedExpressions
        Used to maintain identity of cloned expressions.

      • addAdditionalExpressionsWithinCurrrentExpressionContext

        protected boolean addAdditionalExpressionsWithinCurrrentExpressionContext
        Used to trigger adding additional join operations etc to the expression being processed instead of at the end of the where clause. Useful for dealing with Treat within an Or clause, as the type expression needs to be appended within the OR condition rather AND'd to the entire thing.

      • additionalLocalExpression

        protected Expression additionalLocalExpression
        Local expression from joins being added to the original expression.

    • Constructor Detail

    • Method Detail

      • setClonedExpressions

        public void setClonedExpressions​(java.util.Map<Expression,​Expression> clonedExpressions)

      • addAdditionalExpression

        public void addAdditionalExpression​(Expression theExpression)

      • addSubSelectExpression

        public void addSubSelectExpression​(SubSelectExpression subSelectExpression)
        INTERNAL: Remember this subselect so that it can be normalized after the enclosing select statement is.

      • getAdditionalExpression

        public Expression getAdditionalExpression()

      • encounteredSubSelectExpressions

        public boolean encounteredSubSelectExpressions()
        INTERNAL: Were subselect expressions found while normalizing the selection criteria? Assumes underlying collection is initialized on first add.

      • normalizeSubSelects

        public void normalizeSubSelects​(java.util.Map clonedExpressions)
        INTERNAL: Normalize all subselect expressions found in the course of normalizing the enclosing query. This method allows one to completely normalize the parent statement first (which should treat its sub selects as black boxes), and then normalize the subselects (which require full knowledge of the enclosing statement). This should make things clearer too, Assumes encounteredSubSelectExpressions() true. For CR#4223.

      • setAdditionalExpression

        public void setAdditionalExpression​(Expression additionalExpression)

      • addAdditionalLocalExpression

        public void addAdditionalLocalExpression​(Expression theExpression)
        Similar to addAdditionalExpression, this keeps a running expression used for joins so that they can be added locally within 'OR' predicates rather than to the entire where clause. If addAdditionalExpressionsWithinCurrrentExpressionContext is false, it will work the same as addAdditionalExpression
        Parameters:
        theExpression -

      • processAdditionalLocalExpressions

        public Expression processAdditionalLocalExpressions​(Expression localExpression,
                                                    boolean isLogicalExpression)
        INTERNAL This will return the localExpression if isLogicalExpression is false, otherwise it will check the addAdditionalExpressionsWithinCurrrentExpressionContext flag and clear additionalLocalExpression once adding it to the localExpression.
        Parameters:
        localExpression -
        isLogicalExpression -
        Returns:

      • isAddAdditionalExpressionsWithinCurrrentExpressionContext

        public boolean isAddAdditionalExpressionsWithinCurrrentExpressionContext()

      • setAddAdditionalExpressionsWithinCurrrentExpressionContext

        public void setAddAdditionalExpressionsWithinCurrrentExpressionContext​(boolean addAdditionalExpressionsWithinCurrrentExpressionContext)
        INTERNAL: Allows keeping track when the normalizer is within a logical OR statement, where additionalExpressions might need to be added to the local expression instead of at the end of the where clause.
        Parameters:
        addAdditionalExpressionsWithinCurrrentExpressionContext -