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

Class LowerExpression<T,​R>

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

    • Constructor Detail

      • LowerExpression

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

    • Method Detail

      • apply

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