public class ImplicitObjectELResolver extends ELResolver
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)).ELResolverRESOLVABLE_AT_DESIGN_TIME, TYPE| Constructor and Description |
|---|
ImplicitObjectELResolver() |
| Modifier and Type | Method and Description |
|---|---|
java.lang.Class<java.lang.String> |
getCommonPropertyType(ELContext context,
java.lang.Object base)
If the base object is
null, returns String.class. |
java.util.Iterator<java.beans.FeatureDescriptor> |
getFeatureDescriptors(ELContext context,
java.lang.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. |
java.lang.Class |
getType(ELContext context,
java.lang.Object base,
java.lang.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(). |
java.lang.Object |
getValue(ELContext context,
java.lang.Object base,
java.lang.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,
java.lang.Object base,
java.lang.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,
java.lang.Object base,
java.lang.Object property,
java.lang.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. |
convertToType, invokepublic java.lang.Object getValue(ELContext context, java.lang.Object base, java.lang.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.java.lang.NullPointerException - if context is nullpublic java.lang.Class getType(ELContext context, java.lang.Object base, java.lang.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.java.lang.NullPointerException - if context is nullpublic void setValue(ELContext context, java.lang.Object base, java.lang.Object property, java.lang.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.java.lang.NullPointerException - if context is null.PropertyNotWritableException - always thrown, if the implicit object name is recognized by this resolver.public boolean isReadOnly(ELContext context, java.lang.Object base, java.lang.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.java.lang.NullPointerException - if context is null.public java.util.Iterator<java.beans.FeatureDescriptor> getFeatureDescriptors(ELContext context, java.lang.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.TYPEELResolver.RESOLVABLE_AT_DESIGN_TIMEtrue.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.FeatureDescriptorpublic java.lang.Class<java.lang.String> getCommonPropertyType(ELContext context, java.lang.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.