com.sun.faces.el

Class ChainAwareVariableResolver

java.lang.Object

javax.faces.el.VariableResolver

com.sun.faces.el.ChainAwareVariableResolver

public class ChainAwareVariableResolver
extends VariableResolver

This special VariableResolver serves as the "original" VariableResolver that is passed to the one-arg ctor for the first custom VariableResolver that is encountered during application configuration. Subsequent VariableResolver instances get passed the previous VariableResolver instance, per section 10.4.5 of the spec.

The "specialness" of this VariableResolver is found in its resolveVariable(javax.faces.context.FacesContext, java.lang.String) method, which delegates to the head of the "correct" ELResolver chain based on the context in which this expression is being evaluated. If the expression being evaluated originated in a JSP page, the Application's ExpressionFactory is used to create a ValueExpression, which is then evaluated to resolve the variable. This will cause the ELResolver chain described in section 5.6.1 of the spec to be used. If the expression being evaluated originated in a programmatic API call, the Application's ELResolver is used to resolve the variable. This will cause the ELResolver chain described in section 5.6.2 of the spec to be used.

Constructor Summary

Constructors

Constructor and Description
ChainAwareVariableResolver()

Method Summary

Modifier and Type	Method and Description
Object	resolveVariable(FacesContext context, String name) See the class javadocs.

Methods inherited from class java.lang.Object

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

Constructor Detail

ChainAwareVariableResolver

public ChainAwareVariableResolver()

Method Detail

resolveVariable

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

See the class javadocs.

Specified by:

resolveVariable in class VariableResolver

Parameters:

context - FacesContext against which to resolve this variable name

name - Name of the variable to be resolved

Returns:

the result of the resolution

Throws:

EvaluationException - if an exception is thrown while resolving the variable name (the thrown exception must be included as the cause property of this exception)