Package org.sqlproc.engine.impl

Class SqlMetaLogOperator

java.lang.Object

org.sqlproc.engine.impl.SqlMetaLogOperator

All Implemented Interfaces:

SqlMetaLogOperand

class SqlMetaLogOperator
extends Object
implements SqlMetaLogOperand

A META SQL sub-element. It represents a logical operator in SqlMetaLogExpr.

Author:

Vladimir Hudec

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
(package private) static enum	SqlMetaLogOperator.Type	The enumeration of the logical operator types.

Field Summary

Fields

Modifier and Type	Field	Description
private SqlMetaLogOperator.Type	type	The type of the logical operator.

Constructor Summary

Constructors

Constructor	Description
SqlMetaLogOperator(SqlMetaLogOperator.Type type)	Creates a new instance.

Method Summary

Modifier and Type	Method	Description
(package private) SqlMetaLogOperator.Type	getType()	Returns the type of the logical operator.
boolean	processExpression(SqlProcessContext ctx)	The main contract to evaluate a logical value of META SQL sub-elements.

Methods inherited from class java.lang.Object

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

Field Details

type

private SqlMetaLogOperator.Type type

The type of the logical operator. It work as a operator between two sub-elements in SqlMetaLogExpr.

Constructor Details

SqlMetaLogOperator

SqlMetaLogOperator(SqlMetaLogOperator.Type type)

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

Parameters:

type - the type of the logical operator

Method Details

getType

SqlMetaLogOperator.Type getType()

Returns the type of the logical operator.

Returns:

the type of the logical operator

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