javax.el

Class MapELResolver

java.lang.Object

javax.el.ELResolver

javax.el.MapELResolver

public class MapELResolver
extends ELResolver

Defines property resolution behavior on instances of Map.

This resolver handles base objects of type java.util.Map. It accepts any object as a property and uses that object as a key in the map. The resulting value is the value in the map that is associated with that key.

This resolver can be constructed in read-only mode, which means that isReadOnly will always return true and setValue(javax.el.ELContext, java.lang.Object, java.lang.Object, java.lang.Object) will always throw PropertyNotWritableException.

ELResolvers are combined together using CompositeELResolvers, to define rich semantics for evaluating an expression. See the javadocs for ELResolver for details.

Since:

JSP 2.1

See Also:

CompositeELResolver, ELResolver, Map

Field Summary

Fields inherited from class javax.el.ELResolver

RESOLVABLE_AT_DESIGN_TIME, TYPE

Constructor Summary

Constructors

Constructor and Description
MapELResolver() Creates a new read/write MapELResolver.
MapELResolver(boolean isReadOnly) Creates a new MapELResolver whose read-only status is determined by the given parameter.

Method Summary

Modifier and Type	Method and Description
Class<?>	getCommonPropertyType(ELContext context, Object base) If the base object is a map, returns the most general type that this resolver accepts for the property argument.
Iterator<FeatureDescriptor>	getFeatureDescriptors(ELContext context, Object base) If the base object is a map, returns an Iterator containing the set of keys available in the Map.
Class<?>	getType(ELContext context, Object base, Object property) If the base object is a map, returns the most general acceptable type for a value in this map.
Object	getValue(ELContext context, Object base, Object property) If the base object is a map, returns the value associated with the given key, as specified by the property argument.
boolean	isReadOnly(ELContext context, Object base, Object property) If the base object is a map, returns whether a call to setValue(javax.el.ELContext, java.lang.Object, java.lang.Object, java.lang.Object) will always fail.
void	setValue(ELContext context, Object base, Object property, Object val) If the base object is a map, attempts to set the value associated with the given key, as specified by the property argument.

Methods inherited from class javax.el.ELResolver

convertToType, invoke

Methods inherited from class java.lang.Object