javax.el

Class ListELResolver

java.lang.Object

javax.el.ELResolver

javax.el.ListELResolver

public class ListELResolver
extends ELResolver

Property resolution on lists.

Since:

2.1

Field Summary

Fields inherited from class javax.el.ELResolver

RESOLVABLE_AT_DESIGN_TIME, TYPE

Constructor Summary

Constructors

Constructor and Description
ListELResolver() New read/write resolver.
ListELResolver(boolean readOnly) New resolver with the specified behavior.

Method Summary

Methods

Modifier and Type	Method and Description
java.lang.Class	getCommonPropertyType(ELContext context, java.lang.Object base) If the base is a list, returns Integer.class.
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 type of values in this list.
java.lang.Object	getValue(ELContext context, java.lang.Object base, java.lang.Object property) Returns the value at the given index.
boolean	isReadOnly(ELContext context, java.lang.Object base, java.lang.Object property) Indicates whether the value at the specified index is read-only.
void	setValue(ELContext context, java.lang.Object base, java.lang.Object property, java.lang.Object value) Sets the value at the given index.

Methods inherited from class java.lang.Object

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

Constructor Detail

ListELResolver

public ListELResolver()

New read/write resolver.

ListELResolver

public ListELResolver(boolean readOnly)

New resolver with the specified behavior.

Parameters:

readOnly - true only if the resolver is to be read-only

Method Detail

getValue

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

Returns the value at the given index.

Specified by:

getValue in class ELResolver

Parameters:

property - the list index

context - the evaluation context

base - the target of the operation

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

Returns the type of values in this list.

Specified by:

getType in class ELResolver

Parameters:

property - the list index

context - the evaluation context

base - the target of the operation

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

Sets the value at the given index.

Specified by:

setValue in class ELResolver

Parameters:

property - the list index

context - the evaluation context

base - the target of the operation

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

Indicates whether the value at the specified index is read-only.

Specified by:

isReadOnly in class ELResolver

Parameters:

property - the list index

context - the evaluation context

base - the target of the operation

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 getCommonPropertyType(ELContext context,
                                    java.lang.Object base)

If the base is a list, returns Integer.class. Otherwise returns null.

Specified by:

getCommonPropertyType in class ELResolver

Parameters:

context - the evaluation context

base - the target of the operation