org.sqlproc.engine.impl
Class SqlMetaConst

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

All Implemented Interfaces:

SqlMetaElement, SqlMetaLogOperand, SqlMetaSimple

 class SqlMetaConst
extends Object
implements SqlMetaSimple, SqlMetaLogOperand

A META SQL sub-element. It represents a static input value.

Schematically:

 SqlMetaConst
     +-SqlMetaConstItem.SqlMetaConstItem...^SqlMyType^value
 

Author:

Vladimir Hudec

Field Summary

private SqlInputValue.Case	caseConversion Which conversion should be done on input value.
private List<SqlMetaConstItem>	elements The list of sub-elements.
(package private) org.slf4j.Logger	logger The internal slf4j logger.
private boolean	not An indicator, which is used to control, how the input value is added to the final ANSI SQL.
private SqlType	sqlType The type of this input value.

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

SqlMetaConst(SqlInputValue.Case caseConversion)
Creates a new instance of this entity.

SqlMetaConst(SqlInputValue.Case caseConversion, boolean not)
Creates a new instance of this entity.

SqlMetaConst(SqlInputValue.Case caseConversion, boolean not, SqlType type)
Creates a new instance of this entity.

Method Summary

(package private) void	addConst(SqlMetaConstItem element) Adds a new name.
(package private) void	addConst(String name) Adds a new name.
private String	getData(Object obj) Returns a String representation of input values, after a possible transformation process.
(package private) SqlType	getSqlType() Returns the type of this input value.
(package private) boolean	isNot() Returns the indicator, which is used to control, how the input value is added to the final ANSI SQL.
SqlProcessResult	process(SqlProcessContext ctx) The main contract for a dynamic ANSI SQL Query generation.
boolean	processExpression(SqlProcessContext ctx) The main contract to evaluate a logical value of META SQL sub-elements.
(package private) void	setMetaType(SqlMetaType metaType) Sets the internal type of this input value.
(package private) void	setNot(boolean not) Sets the indicator, which is used to control, how the input value is added to the final ANSI SQL.
void	setValues(String value, String value2) Sets the values.

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.

caseConversion

private SqlInputValue.Case caseConversion

Which conversion should be done on input value.

not

private boolean not

An indicator, which is used to control, how the input value is added to the final ANSI SQL. A standard behavior is to add an input value only in the case it's not empty. The definition of the emptiness depends on the type of the input value.

elements

private List<SqlMetaConstItem> elements

The list of sub-elements. Every sub-element represents the name of an attribute in the input class (the static parameters class). In case there're more names, the input classes are embedded one in other.

sqlType

private SqlType sqlType

The type of this input value. It can be Hibernate or an internal type.

Constructor Detail

SqlMetaConst

SqlMetaConst(SqlInputValue.Case caseConversion)

Creates a new instance of this entity. Used from inside ANTLR parser.

Parameters:

caseConversion - which conversion should be done on inputValue

SqlMetaConst

SqlMetaConst(SqlInputValue.Case caseConversion,
             boolean not)

Creates a new instance of this entity. Used from inside ANTLR parser.

Parameters:

caseConversion - which conversion should be done on inputValue

not - an indicator, which is used to control, how the input value is added to the final ANSI SQL

SqlMetaConst

SqlMetaConst(SqlInputValue.Case caseConversion,
             boolean not,
             SqlType type)

Creates a new instance of this entity. Used from inside ANTLR parser.

Parameters:

caseConversion - which conversion should be done on inputValue

not - an indicator, which is used to control, how the input value is added to the final ANSI SQL

type - the type of this input value, which can be Hibernate or an internal type

Method Detail

addConst

void addConst(String name)

Adds a new name. This is the name of an attribute in the input class (the static parameters class). In case there're more names, the input classes are embedded one in other.

Parameters:

name - the next name in the list of names

addConst

void addConst(SqlMetaConstItem element)

Adds a new name. This is the name of an attribute in the input class (the static parameters class). In case there're more names, the input classes are embedded one in other.

Parameters:

element - an object representation of the next name in the list of names

setMetaType

void setMetaType(SqlMetaType metaType)

Sets the internal type of this input value.

Parameters:

metaType - an internal type

setValues

public void setValues(String value,
                      String value2)

Sets the values. Right now only for the special of the enumeration type of the input value. The logical evaluation of the input value is based on the comparison to this value.

Parameters:

value - the value for special treatment, might be an identifier of value2

value2 - the value for special treatment

getSqlType

SqlType getSqlType()

Returns the type of this input value. It can be Hibernate or an internal type.

Returns:

the type of this input value

setNot

void setNot(boolean not)

Sets the indicator, which is used to control, how the input value is added to the final ANSI SQL. A standard behavior is to add an input value only in the case it's not empty. The definition of the emptiness depends on the type of the input value.

Parameters:

not - a new indicator value

isNot

boolean isNot()

Returns the indicator, which is used to control, how the input value is added to the final ANSI SQL. A standard behavior is to add an input value only in the case it's not empty. The definition of the emptiness depends on the type of the input value.

Returns:

the indicator value

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

getData

private String getData(Object obj)

Returns a String representation of input values, after a possible transformation process.

Parameters:

obj - a raw input value

Returns:

the transformed input value

processExpression

public boolean processExpression(SqlProcessContext ctx)

The main contract to evaluate a logical value of META SQL sub-elements.

Specified by:

processExpression in interface SqlMetaLogOperand

Parameters:

ctx - the context for a dynamic ANSI SQL Query generation

Returns:

a logical value