Package org.apache.qpid.server.query.engine.parsing.expression.function.string

Class UpperExpression<T,​R>

  • Type Parameters:
    T - Input parameter type
    R - Return parameter type
    All Implemented Interfaces:
    Function<T,​String>, Expression<T,​String>, ExpressionNode<T,​String>
    public class UpperExpression<T,​R>
extends AbstractFunctionExpression<T,​String>
    UPPER takes a string parameter and converts it to upper case. The implicit conversion to strings follows the existing rules for data type conversions. If any argument is NULL, UPPER returns NULL.

    • Constructor Detail

      • UpperExpression

        public UpperExpression​(String alias,
                       List<ExpressionNode<T,​?>> args)
        Constructor initializes children expression list
        Parameters:
        alias - Expression alias
        args - List of children expressions

    • Method Detail

      • apply

        public String apply​(T value)
        Performs uppercase operation using parameters and the value supplied
        Parameters:
        value - Object to handle
        Returns:
        Resulting string