com.jfinal.template.expr.ast

Class NullSafe

java.lang.Object

com.jfinal.template.expr.ast.Expr

com.jfinal.template.expr.ast.NullSafe

public class NullSafe
extends Expr

NullSafe 在原则上只支持具有动态特征的用法，例如：方法调用、字段取值、Map 与 List 取值 而不支持具有静态特征的用法，例如：static method 调用、shared method 调用 用法： #( seoTitle ?? "JFinal 极速开发社区" ) 支持级联： #( a.b.c ?? "JFinal 极速开发社区" ) 支持嵌套： #( a ?? b ?? c ?? d)

Field Summary

Fields inherited from class com.jfinal.template.expr.ast.Expr

location

Constructor Summary

Constructors

Constructor and Description
NullSafe(Expr left, Expr right, Location location)

Method Summary

Modifier and Type	Method and Description
Object	eval(Scope scope)

Methods inherited from class java.lang.Object

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

Constructor Detail

NullSafe

public NullSafe(Expr left,
                Expr right,
                Location location)

Method Detail

eval

public Object eval(Scope scope)

Specified by:

eval in class Expr