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java.lang.Objectjavax.el.ELResolver
javax.servlet.jsp.el.ImplicitObjectELResolver
public class ImplicitObjectELResolver
Defines variable resolution behavior for the EL implicit objects defined in the JSP specification.
The following variables are resolved by this ELResolver,
as per the JSP specification:
pageContext - the PageContext object.pageScope - a Map that maps page-scoped
attribute names to their values.requestScope - a Map that maps
request-scoped attribute names to their values.sessionScope - a Map that maps
session-scoped attribute names to their values.applicationScope - a Map that maps
application-scoped attribute names to their values.param - a Map that maps parameter
names to a single String parameter value (obtained by calling
ServletRequest.getParameter(String name)).paramValues - a Map that maps parameter
names to a String[] of all values for that
parameter (obtained by calling
ServletRequest.getParameterValues(String name)).header - a Map that maps header names
to a single String header value (obtained by calling
HttpServletRequest.getHeader(String name)).headerValues - a Map that maps header
names to a String[] of all values for that header
(obtained by calling
HttpServletRequest.getHeaders(String)).cookie - a Map that maps cookie names
to a single Cookie object. Cookies are retrieved
according to the semantics of
HttpServletRequest.getCookies(). If the same name
is shared by multiple cookies, an implementation must use the
first one encountered in the array of Cookie objects
returned by the getCookies() method. However, users
of the cookie implicit object must be aware that the ordering
of cookies is currently unspecified in the servlet
specification.initParam - a Map that maps context
initialization parameter names to their String parameter
value (obtained by calling
ServletContext.getInitParameter(String name)).
ELResolver| Field Summary |
|---|
| Fields inherited from class javax.el.ELResolver |
|---|
RESOLVABLE_AT_DESIGN_TIME, TYPE |
| Constructor Summary | |
|---|---|
ImplicitObjectELResolver()
|
|
| Method Summary | |
|---|---|
Class<String> |
getCommonPropertyType(ELContext context,
Object base)
If the base object is null, returns
String.class. |
Iterator<FeatureDescriptor> |
getFeatureDescriptors(ELContext context,
Object base)
If the base object is null, and the property matches
the name of a JSP implicit object, returns an Iterator
containing FeatureDescriptor objects with information
about each JSP implicit object resolved by this resolver. |
Class |
getType(ELContext context,
Object base,
Object property)
If the base object is null, and the property matches
the name of a JSP implicit object, returns null to
indicate that no types are ever accepted to setValue(). |
Object |
getValue(ELContext context,
Object base,
Object property)
If the base object is null, and the property matches
the name of a JSP implicit object, returns the implicit object. |
boolean |
isReadOnly(ELContext context,
Object base,
Object property)
If the base object is null, and the property matches
the name of a JSP implicit object, returns true
to indicate that implicit objects cannot be overwritten. |
void |
setValue(ELContext context,
Object base,
Object property,
Object val)
If the base object is null, and the property matches
the name of a JSP implicit object, throws
PropertyNotWritableException to indicate that implicit
objects cannot be overwritten. |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
|---|
public ImplicitObjectELResolver()
| Method Detail |
|---|
public Object getValue(ELContext context,
Object base,
Object property)
null, and the property matches
the name of a JSP implicit object, returns the implicit object.
The propertyResolved property of the
ELContext object must be set to true by
this resolver before returning if an implicit object is matched. If
this property is not true after this method is called,
the caller should ignore the return value.
getValue in class ELResolvercontext - The context of this evaluation.base - Only null is handled by this resolver.
Other values will result in an immediate return.property - The name of the implicit object to resolve.
propertyResolved property of
ELContext was set to true, then
the implicit object; otherwise undefined.
NullPointerException - if context is null
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 getType(ELContext context,
Object base,
Object property)
null, and the property matches
the name of a JSP implicit object, returns null to
indicate that no types are ever accepted to setValue().
The propertyResolved property of the
ELContext object must be set to true by
this resolver before returning if an implicit object is matched. If
this property is not true after this method is called,
the caller should ignore the return value.
getType in class ELResolvercontext - The context of this evaluation.base - Only null is handled by this resolver.
Other values will result in an immediate return.property - The name of the implicit object to resolve.
propertyResolved property of
ELContext was set to true, then
null; otherwise undefined.
NullPointerException - if context is null
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 void setValue(ELContext context,
Object base,
Object property,
Object val)
null, and the property matches
the name of a JSP implicit object, throws
PropertyNotWritableException to indicate that implicit
objects cannot be overwritten.
The propertyResolved property of the
ELContext object must be set to true by
this resolver before returning if an implicit object is matched. If
this property is not true after this method is called,
the caller should ignore the return value.
setValue in class ELResolvercontext - The context of this evaluation.base - Only null is handled by this resolver.
Other values will result in an immediate return.property - The name of the implicit object.val - The value to be associated with the implicit object.
NullPointerException - if context is null.
PropertyNotWritableException - always thrown, if the
implicit object name is recognized by this resolver.
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 boolean isReadOnly(ELContext context,
Object base,
Object property)
null, and the property matches
the name of a JSP implicit object, returns true
to indicate that implicit objects cannot be overwritten.
The propertyResolved property of the
ELContext object must be set to true by
this resolver before returning if an implicit object is matched. If
this property is not true after this method is called,
the caller should ignore the return value.
isReadOnly in class ELResolvercontext - The context of this evaluation.base - Only null is handled by this resolver.
Other values will result in an immediate return.property - The name of the implicit object.
propertyResolved property of
ELContext was set to true, then
true; otherwise undefined.
NullPointerException - if context is null.
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 Iterator<FeatureDescriptor> getFeatureDescriptors(ELContext context,
Object base)
null, and the property matches
the name of a JSP implicit object, returns an Iterator
containing FeatureDescriptor objects with information
about each JSP implicit object resolved by this resolver. Otherwise,
returns null.
The Iterator returned must contain one instance of
FeatureDescriptor for each of the EL implicit objects
defined by the JSP spec. Each info object contains information about
a single implicit object, and is initialized as follows:
falsefalsetrueFeatureDescriptors:
ELResolver.TYPE - The runtime type of the implicit object.ELResolver.RESOLVABLE_AT_DESIGN_TIME - true.
getFeatureDescriptors in class ELResolvercontext - The context of this evaluation.base - Only null is handled by this resolver.
Other values will result in a null return value.
Iterator containing one
FeatureDescriptor object for each implicit object, or
null if base is not null.FeatureDescriptor
public Class<String> getCommonPropertyType(ELContext context,
Object base)
null, returns
String.class. Otherwise, returns null.
getCommonPropertyType in class ELResolvercontext - The context of this evaluation.base - Only null is handled by this resolver.
Other values will result in a null return value.
null if base is not null; otherwise
String.class.
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Copyright 2006 Sun Microsystems, Inc. All rights reserved.