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

(package private) static class

SqlMetaLogOperator.Type The enumeration of the logical operator types.

Field Summary

private SqlMetaLogOperator.Type

type The type of the logical operator.

Constructor Summary

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

Method Summary

(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 Detail

type

private SqlMetaLogOperator.Type type

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

Constructor Detail

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 Detail

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