Examples with VisitorAdapter com.blazebit.persistence.parser.expression.VisitorAdapter used on opensource projects

Example 1 with VisitorAdapter

use of com.blazebit.persistence.parser.expression.VisitorAdapter in project blaze-persistence by Blazebit.

the class GroupByExpressionGatheringVisitor method extractGroupByExpressions.

public Set<Expression> extractGroupByExpressions(Expression expression, ClauseType clauseType) {
    // Also, grouping by just a parameter does not make sense as the value is constant
    if (expression instanceof LiteralExpression || expression instanceof ParameterExpression) {
        return Collections.emptySet();
    }
    clear();
    try {
        // When having a predicate at the top level, we have to collect
        collect = expression instanceof Predicate;
        boolean expressionWasSplit = expression.accept(this);
        // In the HAVING clause we additionally add the path expressions to the expression set for DBMS like MySQL that's don't support partial expression structure matching
        if (clauseType == ClauseType.HAVING && !dbmsDialect.supportsGroupByExpressionInHavingMatching()) {
            expression.accept(new VisitorAdapter() {

                @Override
                public void visit(FunctionExpression expression) {
                    // Skip aggregate expressions
                    if (expression instanceof AggregateExpression || (treatSizeAsAggregate && com.blazebit.persistence.parser.util.ExpressionUtils.isSizeFunction(expression))) {
                        return;
                    }
                    super.visit(expression);
                }

                @Override
                public void visit(SubqueryExpression expression) {
                    GroupByExpressionGatheringVisitor.this.visit(expression);
                }

                @Override
                public void visit(PathExpression expression) {
                    if (expression.getBaseNode() == null) {
                        ((SelectInfo) aliasManager.getAliasInfo(expression.toString())).getExpression().accept(this);
                    } else {
                        expressions.add(expression);
                    }
                }

                @Override
                public void visit(TreatExpression expression) {
                    expressions.add(expression);
                }

                @Override
                public void visit(PropertyExpression expression) {
                    expressions.add(expression);
                }

                @Override
                public void visit(ListIndexExpression expression) {
                    expressions.add(expression);
                }

                @Override
                public void visit(MapEntryExpression expression) {
                    expressions.add(expression);
                }

                @Override
                public void visit(MapKeyExpression expression) {
                    expressions.add(expression);
                }

                @Override
                public void visit(MapValueExpression expression) {
                    expressions.add(expression);
                }
            });
            return expressions;
        }
        if (expressionWasSplit) {
            return expressions;
        }
    } catch (IllegalParameterException ex) {
        throw new IllegalArgumentException("Can't use the expression '" + expression + "' as an implicit group by clause, because the parameter '" + ex.parameterExpression + "' with the value '" + ex.value + "' can't be rendered as literal which is required!", ex);
    }
    return Collections.singleton(expression);
}