org.sqlproc.engine.impl
Class SqlMetaIf

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

All Implemented Interfaces:

SqlMetaElement

 class SqlMetaIf
extends Object
implements SqlMetaElement

A META SQL sub-element.

Schematically:

 SqlMetaIf 
     {? SqlMetaLogExpr | SqlMetaIfItem | SqlMetaIfItem...}
 

Author:

Vladimir Hudec

Field Summary

(package private) List<SqlMetaIfItem>	elements The list of maximum 2 sub-elements based on ANTLR grammar.
(package private) SqlMetaLogExpr	expression The logical expression.
(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_SEPARATOR, lCONST_PREFIX, lIDENT_PREFIX, OR_PREFIX, SET_PREFIX, VALUES_PREFIX, WHERE_PREFIX

Constructor Summary

SqlMetaIf()
Creates a new instance.

Method Summary

(package private) void	addElement(SqlMetaIfItem element) Adds a new sub-element.
SqlProcessResult	process(SqlProcessContext ctx) The main contract for a dynamic ANSI SQL Query generation.
(package private) void	setExpression(SqlMetaLogExpr expression) Sets a logical expression.

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

List<SqlMetaIfItem> elements

The list of maximum 2 sub-elements based on ANTLR grammar.

expression

SqlMetaLogExpr expression

The logical expression. Based on the value of this expression the first or the second sub-element will become a part of the final ANSI SQL.

Constructor Detail

SqlMetaIf

SqlMetaIf()

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

Method Detail

addElement

void addElement(SqlMetaIfItem element)

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

Parameters:

element - new sub-element, based on ANTLR grammar

setExpression

void setExpression(SqlMetaLogExpr expression)

Sets a logical expression. It's used from inside ANTLR parser. Based on the value of this expression the first or the second sub-element will become a part of the final ANSI SQL.

Parameters:

expression - the new value of logical expression

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