javax.servlet.jsp.el

Class ImplicitObjectELResolver

java.lang.Object

javax.el.ELResolver

javax.servlet.jsp.el.ImplicitObjectELResolver

public class ImplicitObjectELResolver
extends ELResolver

Variable resolution for EL implicit objects. The following objects are resolved:

• pageContext
• pageScope
• requestScope
• sessionScope
• applicationScope
• param
• paramValues
• header
• headerValues
• cookie
• initParam

Since:

2.1

Field Summary

Fields inherited from class javax.el.ELResolver

RESOLVABLE_AT_DESIGN_TIME, TYPE

Constructor Summary

Constructors

Constructor and Description
ImplicitObjectELResolver()

Method Summary

Methods

Modifier and Type	Method and Description
java.lang.Class<java.lang.String>	getCommonPropertyType(ELContext context, java.lang.Object base) Returns String.class if the base argument is null.
java.util.Iterator<java.beans.FeatureDescriptor>	getFeatureDescriptors(ELContext context, java.lang.Object base) Returns metadata about the variables or properties within the specified base object.
java.lang.Class	getType(ELContext context, java.lang.Object base, java.lang.Object property) Returns the class of the specified property of the base object.
java.lang.Object	getValue(ELContext context, java.lang.Object base, java.lang.Object property) Resolves the specified property of the base object.
boolean	isReadOnly(ELContext context, java.lang.Object base, java.lang.Object property) Indicates whether the specified property of the base object is read-only.
void	setValue(ELContext context, java.lang.Object base, java.lang.Object property, java.lang.Object value) Sets the value of the specified property of the base object.

Methods inherited from class java.lang.Object

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

Constructor Detail

ImplicitObjectELResolver

public ImplicitObjectELResolver()

Method Detail

getValue

public java.lang.Object getValue(ELContext context,
                        java.lang.Object base,
                        java.lang.Object property)
                          throws java.lang.NullPointerException,
                                 PropertyNotFoundException,
                                 ELException

Description copied from class: ELResolver

Resolves the specified property of the base object.

Specified by:

getValue in class ELResolver

Parameters:

context - the evaluation context

base - the target of the operation

property - the property of the base object

Throws:

java.lang.NullPointerException

PropertyNotFoundException

ELException

getType

public java.lang.Class getType(ELContext context,
                      java.lang.Object base,
                      java.lang.Object property)
                        throws java.lang.NullPointerException,
                               PropertyNotFoundException,
                               ELException

Description copied from class: ELResolver

Returns the class of the specified property of the base object.

Specified by:

getType in class ELResolver

Parameters:

context - the evaluation context

base - the target of the operation

property - the property of the base object

Throws:

java.lang.NullPointerException

PropertyNotFoundException

ELException

setValue

public void setValue(ELContext context,
            java.lang.Object base,
            java.lang.Object property,
            java.lang.Object value)
              throws java.lang.NullPointerException,
                     PropertyNotFoundException,
                     PropertyNotWritableException,
                     ELException

Description copied from class: ELResolver

Sets the value of the specified property of the base object.

Specified by:

setValue in class ELResolver

Parameters:

context - the evaluation context

base - the target of the operation

property - the property of the base object

value - the new value of the property

Throws:

PropertyNotWritableException - if the property is read-only

java.lang.NullPointerException

PropertyNotFoundException

ELException

isReadOnly

public boolean isReadOnly(ELContext context,
                 java.lang.Object base,
                 java.lang.Object property)
                   throws java.lang.NullPointerException,
                          PropertyNotFoundException,
                          ELException

Description copied from class: ELResolver

Indicates whether the specified property of the base object is read-only.

Specified by:

isReadOnly in class ELResolver

Parameters:

context - the evaluation context

base - the target of the operation

property - the property of the base object

Throws:

java.lang.NullPointerException

PropertyNotFoundException

ELException

getFeatureDescriptors

public java.util.Iterator<java.beans.FeatureDescriptor> getFeatureDescriptors(ELContext context,
                                                                     java.lang.Object base)

Description copied from class: ELResolver

Returns metadata about the variables or properties within the specified base object.

Specified by:

getFeatureDescriptors in class ELResolver

Parameters:

context - the evaluation context

base - the target of the operation

getCommonPropertyType

public java.lang.Class<java.lang.String> getCommonPropertyType(ELContext context,
                                                      java.lang.Object base)

Returns String.class if the base argument is null.

Specified by:

getCommonPropertyType in class ELResolver

Parameters:

context - the evaluation context

base - the target of the operation