org.sqlproc.engine.impl
Class SqlMetaOrd

java.lang.Object
  org.sqlproc.engine.impl.SqlMetaOrd

All Implemented Interfaces:

SqlMetaElement

 class SqlMetaOrd
extends java.lang.Object
implements SqlMetaElement

A META SQL sub-element. It represents the ORDER command of the final ANSI SQL.

Schematically:

 SqlMetaOrd
     SqlMetaText
     SqlMetaIdent
     SqlMetaConst
 

Author:

Vladimir Hudec

Field Summary

(package private) java.util.List<SqlMetaSimple>	elements The list of sub-elements based on ANTLR grammar.
(package private) int	id The ordering id.
(package private) org.slf4j.Logger	logger The internal slf4j logger.

Fields inherited from interface org.sqlproc.engine.impl.SqlMetaElement

AND_PREFIX, CONST_PREFIX, IDENT_PREFIX, IDENT_PREFIX_LEN, IDENT_SEPARATOR, OR_PREFIX

Constructor Summary

SqlMetaOrd(int id)
Creates a new instance.

Method Summary

(package private) void	addElement(SqlMetaSimple element) Adds a new sub-element.
SqlProcessResult	process(SqlProcessContext ctx) The main contract for a dynamic ANSI SQL Query generation.
private java.lang.StringBuilder	process(java.lang.StringBuilder sql, SqlOrder.Order orderDirrection) Returns ANSI SQL ORDER command for one ordering rule.

Methods inherited from class java.lang.Object

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

Field Detail

logger

final org.slf4j.Logger logger

The internal slf4j logger.

elements

java.util.List<SqlMetaSimple> elements

The list of sub-elements based on ANTLR grammar.

id

int id

The ordering id. This value should correspond to the order number in META SQL {#NNN order by ...}.

Constructor Detail

SqlMetaOrd

SqlMetaOrd(int id)

Creates a new instance. It's used from inside ANTLR parser.

Parameters:

id - the ordering id, which corresponds to the order number in META SQL {#NNN order by ...}

Method Detail

addElement

void addElement(SqlMetaSimple element)

Adds a new sub-element. It's used from inside ANTLR parser.

Parameters:

element - new sub-element, based on ANTLR grammar

process

private java.lang.StringBuilder process(java.lang.StringBuilder sql,
                                        SqlOrder.Order orderDirrection)

Returns ANSI SQL ORDER command for one ordering rule.

Parameters:

sql - the cumulative fragment of the final ordering command

orderDirrection - the ASC or DESC ordering direction

Returns:

the cumulative fragment of the final ordering command

process

public SqlProcessResult process(SqlProcessContext ctx)

The main contract for a dynamic ANSI SQL Query generation. Also known as a META SQL processing. The composite pattern main contract. All ANTLR grammar based elements must implement this contract.

Specified by:

process in interface SqlMetaElement

Parameters:

ctx - the crate for all input parameters and the context of processing