VariableResolver (Java EE 5)

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javax.faces.el Class VariableResolver

java.lang.Object
  javax.faces.el.VariableResolver

Deprecated. This has been replaced by ELResolver when operating with a null base argument.

VariableResolver 代表一种可插入的机制，用于在求值时解析顶级变量引用。

deprecated 使用 null base 参数操作时，由 javax.el.ELResolver 取代。

英文文档：

public abstract class VariableResolver
extends Object

VariableResolver represents a pluggable mechanism for resolving a top-level variable reference at evaluation time.

Constructor Summary
`VariableResolver()` Deprecated.

Method Summary
`abstract Object`	`resolveVariable(FacesContext context, String name)` Deprecated. Resolve the specified variable name, and return the corresponding object, if any; otherwise, return `null`.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

public VariableResolver()

英文文档：
VariableResolver

public VariableResolver()

Deprecated.

Method Detail

abstract public Object resolveVariable(FacesContext context, String name) throws EvaluationException

解析指定的变量名称，并返回相应的对象（如果有）；否则返回 `null`。

context 据以解析此变量名称的 `FacesContext`

name 要解析的变量名称

Throws EvaluationException: 如果解析变量名称时抛出异常（抛出的异常必须作为此异常的 `cause` 属性包含在内）

Throws NullPointerException: 如果 `context` 或 `name` 为 `null`

英文文档：
resolveVariable

public abstract Object resolveVariable(FacesContext context,
                                       String name)
                                throws EvaluationException