javax.el

Class ELResolver

java.lang.Object

javax.el.ELResolver

Direct Known Subclasses:

ArrayELResolver, BeanELResolver, BeanNameELResolver, CompositeELResolver, ListELResolver, MapELResolver, ResourceBundleELResolver, StaticFieldELResolver, StreamELResolverImpl, TypeConverter

public abstract class ELResolver
extends Object

Author:

Jacob Hookom [jacob/hookom.net]

Field Summary

Fields

Modifier and Type	Field and Description
static String	RESOLVABLE_AT_DESIGN_TIME
static String	TYPE

Constructor Summary

Constructors

Constructor and Description
ELResolver()

Method Summary

Methods

Modifier and Type	Method and Description
Object	convertToType(ELContext context, Object obj, Class<?> type) Converts the given object to the given type.
abstract Class<?>	getCommonPropertyType(ELContext context, Object base)
abstract Iterator<FeatureDescriptor>	getFeatureDescriptors(ELContext context, Object base)
abstract Class<?>	getType(ELContext context, Object base, Object property)
abstract Object	getValue(ELContext context, Object base, Object property)
Object	invoke(ELContext context, Object base, Object method, Class<?>[] paramTypes, Object[] params)
abstract boolean	isReadOnly(ELContext context, Object base, Object property)
abstract void	setValue(ELContext context, Object base, Object property, Object value)

Methods inherited from class java.lang.Object

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

Field Detail

TYPE

public static final String TYPE

See Also:

Constant Field Values

RESOLVABLE_AT_DESIGN_TIME

public static final String RESOLVABLE_AT_DESIGN_TIME

See Also:

Constant Field Values

Constructor Detail

ELResolver

public ELResolver()

Method Detail

getValue

public abstract Object getValue(ELContext context,
              Object base,
              Object property)

Throws:

NullPointerException - If the supplied context is null

PropertyNotFoundException - If the base/property combination provided to the resolver is one that the resolver can handle but no match was found or a match was found but was not readable

ELException - Wraps any exception throw whilst resolving the property

invoke

public Object invoke(ELContext context,
            Object base,
            Object method,
            Class<?>[] paramTypes,
            Object[] params)

Since:

EL 2.2

getType

public abstract Class<?> getType(ELContext context,
               Object base,
               Object property)

Throws:

NullPointerException - If the supplied context is null

PropertyNotFoundException - If the base/property combination provided to the resolver is one that the resolver can handle but no match was found or a match was found but was not readable

ELException - Wraps any exception throw whilst resolving the property

setValue

public abstract void setValue(ELContext context,
            Object base,
            Object property,
            Object value)

Throws:

NullPointerException - If the supplied context is null

PropertyNotFoundException - If the base/property combination provided to the resolver is one that the resolver can handle but no match was found

PropertyNotWritableException - If the base/property combination provided to the resolver is one that the resolver can handle but the property was not writable

ELException - Wraps any exception throw whilst resolving the property

isReadOnly

public abstract boolean isReadOnly(ELContext context,
                 Object base,
                 Object property)

Throws:

NullPointerException - If the supplied context is null

PropertyNotFoundException - If the base/property combination provided to the resolver is one that the resolver can handle but no match was found

ELException - Wraps any exception throw whilst resolving the property

getFeatureDescriptors

public abstract Iterator<FeatureDescriptor> getFeatureDescriptors(ELContext context,
                                                Object base)

getCommonPropertyType

public abstract Class<?> getCommonPropertyType(ELContext context,
                             Object base)

convertToType

public Object convertToType(ELContext context,
                   Object obj,
                   Class<?> type)

Converts the given object to the given type. This default implementation always returns null.

Since:

EL 3.0