Package com.mckoi.database.interpret

Class SelectColumn

  • All Implemented Interfaces:
    StatementTreeObject, java.io.Serializable, java.lang.Cloneable
    public final class SelectColumn
extends java.lang.Object
implements java.io.Serializable, StatementTreeObject, java.lang.Cloneable
    Represents a column selected to be in the output of a select statement. This includes being either an aggregate function, a column or "*" which is the entire set of columns.
    Author:
    Tobias Downer
    See Also:
    Serialized Form

    • Field Summary

      Fields 
      Modifier and Type Field Description
      java.lang.String alias
      The alias of this column string.
      Expression expression
      The expression of this column.
      java.lang.String glob_name
      If the column represents a glob of columns (eg.
      Variable internal_name
      The name of this column used internally to reference it.
      Variable resolved_name
      The fully resolved name that this column is given in the resulting table.

    • Constructor Summary

      Constructors 
      Constructor Description
      SelectColumn()  

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      java.lang.Object clone()
      Performs a DEEP clone of this object if it is mutable, or a deep clone of its mutable members.
      void prepareExpressions​(ExpressionPreparer preparer)
      Prepares all expressions in this statement tree object by passing the ExpressionPreparer object to the 'prepare' method of the expression.
      java.lang.String toString()  

      • Methods inherited from class java.lang.Object

        equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

    • Field Detail

      • glob_name

        public java.lang.String glob_name
        If the column represents a glob of columns (eg. 'Part.*' or '*') then this is set to the glob string and 'expression' is left blank.

      • resolved_name

        public Variable resolved_name
        The fully resolved name that this column is given in the resulting table.

      • alias

        public java.lang.String alias
        The alias of this column string.

      • expression

        public Expression expression
        The expression of this column. This is only NOT set when name == "*" indicating all the columns.

      • internal_name

        public Variable internal_name
        The name of this column used internally to reference it.

    • Constructor Detail

      • SelectColumn

        public SelectColumn()

    • Method Detail

      • clone

        public java.lang.Object clone()
                       throws java.lang.CloneNotSupportedException
        Description copied from interface: StatementTreeObject
        Performs a DEEP clone of this object if it is mutable, or a deep clone of its mutable members. If the object is immutable then it may return 'this'.
        Specified by:
        clone in interface StatementTreeObject
        Overrides:
        clone in class java.lang.Object
        Throws:
        java.lang.CloneNotSupportedException

      • toString

        public java.lang.String toString()
        Overrides:
        toString in class java.lang.Object