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java.lang.Objectjavax.el.ELResolver
javax.servlet.jsp.el.ScopedAttributeELResolver
public class ScopedAttributeELResolver
Defines variable resolution behavior for scoped attributes.
This resolver handles all variable resolutions (where base
is null. It searches PageContext.findAttribute()
for a matching attribute. If not found, it will return null,
or in the case of setValue it will create a new attribute
in the page scope with the given name.
ELResolver| Field Summary |
|---|
| Fields inherited from class javax.el.ELResolver |
|---|
RESOLVABLE_AT_DESIGN_TIME, TYPE |
| Constructor Summary | |
|---|---|
ScopedAttributeELResolver()
|
|
| Method Summary | |
|---|---|
java.lang.Class<java.lang.String> |
getCommonPropertyType(ELContext context,
java.lang.Object base)
If the base object is null, returns
String.class. |
java.util.Iterator<java.beans.FeatureDescriptor> |
getFeatureDescriptors(ELContext context,
java.lang.Object base)
If the base object is null, returns an
Iterator containing FeatureDescriptor objects
with information about each scoped attribute resolved by this
resolver. |
java.lang.Class<java.lang.Object> |
getType(ELContext context,
java.lang.Object base,
java.lang.Object property)
If the base object is null, returns
Object.class to indicate that any type is valid to
set for a scoped attribute. |
java.lang.Object |
getValue(ELContext context,
java.lang.Object base,
java.lang.Object property)
If the base object is null, searches the page,
request, session and application scopes for an attribute with
the given name and returns it, or null if no
attribute exists with the current name. |
boolean |
isReadOnly(ELContext context,
java.lang.Object base,
java.lang.Object property)
If the base object is null, returns false
to indicate that scoped attributes are never read-only. |
void |
setValue(ELContext context,
java.lang.Object base,
java.lang.Object property,
java.lang.Object val)
If the base object is null, sets an existing scoped
attribute to the new value, or creates a new scoped attribute if one
does not exist by this name. |
| Methods inherited from class javax.el.ELResolver |
|---|
invoke |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
|---|
public ScopedAttributeELResolver()
| Method Detail |
|---|
public java.lang.Object getValue(ELContext context,
java.lang.Object base,
java.lang.Object property)
null, searches the page,
request, session and application scopes for an attribute with
the given name and returns it, or null if no
attribute exists with the current name.
The propertyResolved property of the
ELContext object must be set to true by
this resolver before returning if base is null. If
this property is not true after this method is called,
the caller should ignore the return value.
getValue in class ELResolvercontext - The context of this evaluation.base - Only null is handled by this resolver.
Other values will result in an immediate return.property - The name of the scoped attribute to resolve.
propertyResolved property of
ELContext was set to true, then
the scoped attribute; otherwise undefined.
java.lang.NullPointerException - if context is null
ELException - if an exception was thrown while performing
the property or variable resolution. The thrown exception
must be included as the cause property of this exception, if
available.
public java.lang.Class<java.lang.Object> getType(ELContext context,
java.lang.Object base,
java.lang.Object property)
null, returns
Object.class to indicate that any type is valid to
set for a scoped attribute.
The propertyResolved property of the
ELContext object must be set to true by
this resolver before returning if base is null. If
this property is not true after this method is called,
the caller should ignore the return value.
getType in class ELResolvercontext - The context of this evaluation.base - Only null is handled by this resolver.
Other values will result in an immediate return.property - The name of the scoped attribute to resolve.
propertyResolved property of
ELContext was set to true, then
Object.class; otherwise undefined.
java.lang.NullPointerException - if context is null
ELException - if an exception was thrown while performing
the property or variable resolution. The thrown exception
must be included as the cause property of this exception, if
available.
public void setValue(ELContext context,
java.lang.Object base,
java.lang.Object property,
java.lang.Object val)
null, sets an existing scoped
attribute to the new value, or creates a new scoped attribute if one
does not exist by this name.
If the provided attribute name matches the key of an attribute in page scope, request scope, session scope, or application scope, the corresponding attribute value will be replaced by the provided value. Otherwise, a new page scope attribute will be created with the given name and value.
The propertyResolved property of the
ELContext object must be set to true by
this resolver before returning if base is null. If
this property is not true after this method is called,
the caller should ignore the return value.
setValue in class ELResolvercontext - The context of this evaluation.base - Only null is handled by this resolver.
Other values will result in an immediate return.property - The name of the scoped attribute to set.val - The value for the scoped attribute.
java.lang.NullPointerException - if context is null.
ELException - if an exception was thrown while performing
the property or variable resolution. The thrown exception
must be included as the cause property of this exception, if
available.
public boolean isReadOnly(ELContext context,
java.lang.Object base,
java.lang.Object property)
null, returns false
to indicate that scoped attributes are never read-only.
The propertyResolved property of the
ELContext object must be set to true by
this resolver before returning if base is null. If
this property is not true after this method is called,
the caller should ignore the return value.
isReadOnly in class ELResolvercontext - The context of this evaluation.base - Only null is handled by this resolver.
Other values will result in an immediate return.property - The name of the scoped attribute.
propertyResolved property of
ELContext was set to true, then
false; otherwise undefined.
java.lang.NullPointerException - if context is null.
ELException - if an exception was thrown while performing
the property or variable resolution. The thrown exception
must be included as the cause property of this exception, if
available.
public java.util.Iterator<java.beans.FeatureDescriptor> getFeatureDescriptors(ELContext context,
java.lang.Object base)
null, returns an
Iterator containing FeatureDescriptor objects
with information about each scoped attribute resolved by this
resolver. Otherwise, returns null.
The Iterator returned must contain one instance of
FeatureDescriptor for each scoped attribute found in
any scope. Each info object contains information about
a single scoped attribute, and is initialized as follows:
falsefalsetrueFeatureDescriptors:
ELResolver#TYPE - The current runtime type of the scoped attribute.ELResolver#RESOLVABLE_AT_DESIGN_TIME - true.
getFeatureDescriptors in class ELResolvercontext - The context of this evaluation.base - Only null is handled by this resolver.
Other values will result in a null return value.
Iterator containing one
FeatureDescriptor object for each scoped attribute, or
null if base is not null.FeatureDescriptor
public java.lang.Class<java.lang.String> getCommonPropertyType(ELContext context,
java.lang.Object base)
null, returns
String.class. Otherwise, returns null.
getCommonPropertyType in class ELResolvercontext - The context of this evaluation.base - Only null is handled by this resolver.
Other values will result in a null return value.
null if base is not null; otherwise
String.class.
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Copyright © 2009 Sun Microsystems, Inc. All Rights Reserved. Use is subject to license terms.
Generated on 24-November-2009 03:24