dragon.ir.query
Class AbstractExpression

java.lang.Object
  |
  +--dragon.ir.query.AbstractExpression

All Implemented Interfaces:

Expression

Direct Known Subclasses:

BoolExpression, SimpleExpression

public abstract class AbstractExpression

extends java.lang.Object

implements Expression

Abstract class for query expression

Copyright: Copyright (c) 2005

Company: IST, Drexel University

Version:

1.0

Author:

Davis Zhou

Field Summary

protected int	expressionType
protected Operator	optr

Fields inherited from interface dragon.ir.query.Expression

EXPRESSION_BOOL, EXPRESSION_SIMPLE

Constructor Summary

AbstractExpression()

Method Summary

Operator	getOperator()
boolean	isBoolExpression()
boolean	isSimpleExpression()

Methods inherited from class java.lang.Object

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

Methods inherited from interface dragon.ir.query.Expression

getChild, getChildNum, toSQLExpression, toString

Field Detail

optr

protected Operator optr

expressionType

protected int expressionType

Constructor Detail

AbstractExpression

public AbstractExpression()

Method Detail

getOperator

public Operator getOperator()

Specified by:

getOperator in interface Expression

isBoolExpression

public boolean isBoolExpression()

Specified by:

isBoolExpression in interface Expression

isSimpleExpression

public boolean isSimpleExpression()

Specified by:

isSimpleExpression in interface Expression