org.josql.expressions

类 BooleanExpression

java.lang.Object

org.josql.expressions.Expression

org.josql.expressions.ValueExpression

org.josql.expressions.BooleanExpression

public class BooleanExpression
extends ValueExpression

构造器概要

构造器

构造器和说明
BooleanExpression()

方法概要

限定符和类型	方法和说明
Object	evaluate(Object o, Query q) Get the value of this boolean.
Class	getExpectedReturnType(Query q) Get the expected return type.
Object	getValue(Object o, Query q) Get the value of this boolean.
boolean	hasFixedResult(Query q) Always returns true since it represents a constant.
void	init(Query q) Init this expression.
boolean	isTrue(Object o, Query q) Returns whether this expression is true or false.
void	setValue(Boolean b)
String	toString() Returns a string version of this expression.

从类继承的方法 org.josql.expressions.Expression

isBracketed, setBracketed

从类继承的方法 java.lang.Object

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

构造器详细资料

BooleanExpression

public BooleanExpression()

方法详细资料

hasFixedResult

public boolean hasFixedResult(Query q)

Always returns true since it represents a constant.

指定者:

hasFixedResult 在类中 Expression

参数:

q - The Query object.

返回:

true always.

toString

public String toString()

Returns a string version of this expression. Basically returns: true | false.

指定者:

toString 在类中 Expression

返回:

A string version of this expression.

getExpectedReturnType

public Class getExpectedReturnType(Query q)

Get the expected return type.

指定者:

getExpectedReturnType 在类中 Expression

参数:

q - The Query object.

返回:

Always returns: java.lang.Boolean.TYPE.

init

public void init(Query q)

Init this expression. Actually does nothing since it is a constant.

指定者:

init 在类中 Expression

参数:

q - The Query object.

setValue

public void setValue(Boolean b)

isTrue

public boolean isTrue(Object o,
                      Query q)

Returns whether this expression is true or false.

指定者:

isTrue 在类中 Expression

参数:

o - The current object, not used in this method.

q - The Query object, not used in this method.

返回:

The value of this expression.

getValue

public Object getValue(Object o,
                       Query q)

Get the value of this boolean.

覆盖:

getValue 在类中 ValueExpression

参数:

o - The current object, not used in this method.

q - The Query object, not used in this method.

返回:

The value of this expression.

evaluate

public Object evaluate(Object o,
                       Query q)

Get the value of this boolean.

指定者:

evaluate 在类中 ValueExpression

参数:

o - The current object, not used in this method.

q - The Query object, not used in this method.

返回:

The value of this expression.