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

Class LengthExpression<T,​R>

  • Type Parameters:
    T - Input parameter type
    R - Return parameter type
    All Implemented Interfaces:
    Function<T,​Integer>, Expression<T,​Integer>, ExpressionNode<T,​Integer>
    public class LengthExpression<T,​R>
extends AbstractFunctionExpression<T,​Integer>
    LENGTH takes a string parameter and returns its length. The implicit conversion to strings follows the existing rules for data type conversions. If any argument is NULL, LENGTH returns 0.

    • Constructor Detail

      • LengthExpression

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

    • Method Detail

      • apply

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