private ASTNode createProjection()

in parser/sql/dialect/firebird/src/main/java/org/apache/shardingsphere/sql/parser/firebird/visitor/statement/type/FirebirdDMLStatementVisitor.java [321:374]
53 lines of code
11 McCabe index (conditional complexity)

    private ASTNode createProjection(final ProjectionContext ctx, final AliasSegment alias) {
        ASTNode projection = visit(ctx.expr());
        if (projection instanceof AggregationProjectionSegment) {
            ((AggregationProjectionSegment) projection).setAlias(alias);
            return projection;
        }
        if (projection instanceof ExpressionProjectionSegment) {
            ((ExpressionProjectionSegment) projection).setAlias(alias);
            return projection;
        }
        if (projection instanceof FunctionSegment) {
            FunctionSegment segment = (FunctionSegment) projection;
            ExpressionProjectionSegment result = new ExpressionProjectionSegment(segment.getStartIndex(), segment.getStopIndex(), segment.getText(), segment);
            result.setAlias(alias);
            return result;
        }
        if (projection instanceof CommonExpressionSegment) {
            CommonExpressionSegment segment = (CommonExpressionSegment) projection;
            ExpressionProjectionSegment result = new ExpressionProjectionSegment(segment.getStartIndex(), segment.getStopIndex(), segment.getText(), segment);
            result.setAlias(alias);
            return result;
        }
        // FIXME :For DISTINCT()
        if (projection instanceof ColumnSegment) {
            ExpressionProjectionSegment result = new ExpressionProjectionSegment(ctx.start.getStartIndex(), ctx.stop.getStopIndex(), getOriginalText(ctx), (ColumnSegment) projection);
            result.setAlias(alias);
            return result;
        }
        if (projection instanceof SubqueryExpressionSegment) {
            SubqueryExpressionSegment subqueryExpressionSegment = (SubqueryExpressionSegment) projection;
            String text = ctx.start.getInputStream().getText(new Interval(subqueryExpressionSegment.getStartIndex(), subqueryExpressionSegment.getStopIndex()));
            SubqueryProjectionSegment result = new SubqueryProjectionSegment(((SubqueryExpressionSegment) projection).getSubquery(), text);
            result.setAlias(alias);
            return result;
        }
        if (projection instanceof BinaryOperationExpression) {
            BinaryOperationExpression binaryExpression = (BinaryOperationExpression) projection;
            int startIndex = binaryExpression.getStartIndex();
            int stopIndex = null == alias ? binaryExpression.getStopIndex() : alias.getStopIndex();
            ExpressionProjectionSegment result = new ExpressionProjectionSegment(startIndex, stopIndex, binaryExpression.getText(), binaryExpression);
            result.setAlias(alias);
            return result;
        }
        if (projection instanceof ParameterMarkerExpressionSegment) {
            ParameterMarkerExpressionSegment result = (ParameterMarkerExpressionSegment) projection;
            result.setAlias(alias);
            return projection;
        }
        ExpressionSegment column = (ExpressionSegment) projection;
        ExpressionProjectionSegment result = null == alias ? new ExpressionProjectionSegment(column.getStartIndex(), column.getStopIndex(), String.valueOf(column.getText()), column)
                : new ExpressionProjectionSegment(column.getStartIndex(), ctx.alias().stop.getStopIndex(), String.valueOf(column.getText()), column);
        result.setAlias(alias);
        return result;
    }