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* Copyright 2004 The Apache Software Foundation
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package javax.servlet.jsp.el;
import java.beans.FeatureDescriptor;
import java.util.Iterator;
import java.util.ArrayList;
import java.util.Enumeration;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.JspContext;
import javax.el.ELContext;
import javax.el.ELResolver;
import javax.el.ELException;
/**
* Defines variable resolution behavior for scoped attributes.
*
*
This resolver handles all variable resolutions (where base
* is null. It searches PageContext.findAttribute()
* for a matching attribute. If not found, it will return null,
* or in the case of setValue it will create a new attribute
* in the page scope with the given name.
*
* @see javax.el.ELResolver
* @since JSP 2.1
*/
public class ScopedAttributeELResolver extends ELResolver {
/**
* If the base object is null, searches the page,
* request, session and application scopes for an attribute with
* the given name and returns it, or null if no
* attribute exists with the current name.
*
*
The propertyResolved property of the
* ELContext object must be set to true by
* this resolver before returning if base is null. If
* this property is not true after this method is called,
* the caller should ignore the return value.
*
* @param context The context of this evaluation.
* @param base Only null is handled by this resolver.
* Other values will result in an immediate return.
* @param property The name of the scoped attribute to resolve.
* @return If the propertyResolved property of
* ELContext was set to true, then
* the scoped attribute; otherwise undefined.
* @throws NullPointerException if context is null
* @throws ELException if an exception was thrown while performing
* the property or variable resolution. The thrown exception
* must be included as the cause property of this exception, if
* available.
*/
public Object getValue(ELContext context,
Object base,
Object property) {
if (context == null) {
throw new NullPointerException();
}
if (base == null) {
context.setPropertyResolved(true);
if (property instanceof String) {
String attribute = (String) property;
PageContext ctxt = (PageContext)
context.getContext(JspContext.class);
return ctxt.findAttribute(attribute);
}
}
return null;
}
/**
* If the base object is null, returns
* Object.class to indicate that any type is valid to
* set for a scoped attribute.
*
*
The propertyResolved property of the
* ELContext object must be set to true by
* this resolver before returning if base is null. If
* this property is not true after this method is called,
* the caller should ignore the return value.
*
* @param context The context of this evaluation.
* @param base Only null is handled by this resolver.
* Other values will result in an immediate return.
* @param property The name of the scoped attribute to resolve.
* @return If the propertyResolved property of
* ELContext was set to true, then
* Object.class; otherwise undefined.
* @throws NullPointerException if context is null
* @throws ELException if an exception was thrown while performing
* the property or variable resolution. The thrown exception
* must be included as the cause property of this exception, if
* available.
*/
public Class
