javax.el

Class ELResolver

java.lang.Object

javax.el.ELResolver

Direct Known Subclasses:

ArrayELResolver, BeanELResolver, CompositeELResolver, ImplicitObjectELResolver, ListELResolver, MapELResolver, ResourceBundleELResolver, ScopedAttributeELResolver

public abstract class ELResolver
extends java.lang.Object

Resolves variables and properties in EL expressions.

Since:

2.1

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	RESOLVABLE_AT_DESIGN_TIME FeatureDescriptor property indicating whether the variable or property can be resolved at compile time.
static java.lang.String	TYPE FeatureDescriptor property indicating the class of the variable or property.

Constructor Summary

Constructors

Constructor and Description
ELResolver()

Method Summary

Methods

Modifier and Type	Method and Description
abstract java.lang.Class	getCommonPropertyType(ELContext context, java.lang.Object base) Returns the most general class of properties in the base object.
abstract 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.
abstract 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.
abstract java.lang.Object	getValue(ELContext context, java.lang.Object base, java.lang.Object property) Resolves the specified property of the base object.
abstract boolean	isReadOnly(ELContext context, java.lang.Object base, java.lang.Object property) Indicates whether the specified property of the base object is read-only.
abstract 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

Field Detail

RESOLVABLE_AT_DESIGN_TIME

public static final java.lang.String RESOLVABLE_AT_DESIGN_TIME

FeatureDescriptor property indicating whether the variable or property can be resolved at compile time.

See Also:

Constant Field Values

TYPE

public static final java.lang.String TYPE

FeatureDescriptor property indicating the class of the variable or property.

See Also:

Constant Field Values

Constructor Detail

ELResolver

public ELResolver()

Method Detail

getValue

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

Resolves the specified property of the base object.

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

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

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 abstract 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 of the specified property of the base object.

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

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

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 abstract 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.

Parameters:

context - the evaluation context

base - the target of the operation

getCommonPropertyType

public abstract java.lang.Class getCommonPropertyType(ELContext context,
                                    java.lang.Object base)

Returns the most general class of properties in the base object.

Parameters:

context - the evaluation context

base - the target of the operation