public class BeanNameELResolver extends ELResolver
An ELResolver for resolving user or container managed beans.
A BeanNameResolver is required for its proper operation. The following example creates an
ELResolver that resolves the name "bean" to an instance of MyBean.
ELResovler elr = new BeanNameELResolver(new BeanNameResolver {
public boolean isNameResolved(String beanName) {
return "bean".equals(beanName);
}
public Object getBean(String beanName) {
return "bean".equals(beanName)? new MyBean(): null;
}
});
RESOLVABLE_AT_DESIGN_TIME, TYPE| Constructor and Description |
|---|
BeanNameELResolver(BeanNameResolver beanNameResolver)
Constructor
|
| Modifier and Type | Method and Description |
|---|---|
java.lang.Class<?> |
getCommonPropertyType(ELContext context,
java.lang.Object base)
Always returns
String.class, since a bean name is a String. |
java.util.Iterator<java.beans.FeatureDescriptor> |
getFeatureDescriptors(ELContext context,
java.lang.Object base)
Always returns
null, since there is no reason to iterate through a list of one element: bean name. |
java.lang.Class<?> |
getType(ELContext context,
java.lang.Object base,
java.lang.Object property)
If the base is null and the property is a name resolvable by the BeanNameResolver, return the type of the bean.
|
java.lang.Object |
getValue(ELContext context,
java.lang.Object base,
java.lang.Object property)
If the base object is
null and the property is a name that is resolvable by the BeanNameResolver,
returns the value resolved by the BeanNameResolver. |
boolean |
isReadOnly(ELContext context,
java.lang.Object base,
java.lang.Object property)
If the base is null and the property is a name resolvable by the BeanNameResolver, attempts to determine if the bean
is writable.
|
void |
setValue(ELContext context,
java.lang.Object base,
java.lang.Object property,
java.lang.Object value)
If the base is null and the property is a name that is resolvable by the BeanNameResolver, the bean in the
BeanNameResolver is set to the given value.
|
convertToType, invokepublic BeanNameELResolver(BeanNameResolver beanNameResolver)
beanNameResolver - The BeanNameResolver that resolves a bean name.public java.lang.Object getValue(ELContext context, java.lang.Object base, java.lang.Object property)
null and the property is a name that is resolvable by the BeanNameResolver,
returns the value resolved by the BeanNameResolver.
If name is resolved by the BeanNameResolver, the propertyResolved property of the ELContext
object must be set to true by this resolver, before returning. 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 - nullproperty - The name of the bean.propertyResolved property of ELContext was set to true, then
the value of the bean with the given name. 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 value)
If the name is resolvable by the BeanNameResolver, or if the BeanNameResolver allows creating a new bean, the
propertyResolved property of the ELContext object must be set to true by the
resolver, before returning. If this property is not true after this method is called, the caller can
safely assume no value has been set.
setValue in class ELResolvercontext - The context of this evaluation.base - nullproperty - The name of the beanvalue - The value to set the bean with the given name to.java.lang.NullPointerException - if context is nullPropertyNotWritableException - if the BeanNameResolver does not allow the bean to be modified.ELException - if an exception was thrown while attempting to set the bean with the given name. The thrown
exception must be included as the cause property of this exception, if available.public java.lang.Class<?> getType(ELContext context, java.lang.Object base, java.lang.Object property)
If the name is resolvable by the BeanNameResolver, the propertyResolved property of the
ELContext object must be set to true by the resolver, before returning. If this property is
not true after this method is called, the caller can safely assume no value has been set.
getType in class ELResolvercontext - The context of this evaluation.base - nullproperty - The name of the bean.propertyResolved property of ELContext was set to true, then
the type of the bean with the given name. 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 boolean isReadOnly(ELContext context, java.lang.Object base, java.lang.Object property)
If the name is resolvable by the BeanNameResolver, the propertyResolved property of the
ELContext object must be set to true by the resolver, before returning. If this property is
not true after this method is called, the caller can safely assume no value has been set.
isReadOnly in class ELResolvercontext - The context of this evaluation.base - nullproperty - The name of the bean.propertyResolved property of ELContext was set to true, then
true if the property is read-only or false if not; 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, since there is no reason to iterate through a list of one element: bean name.getFeatureDescriptors in class ELResolvercontext - The context of this evaluation.base - null.null.FeatureDescriptorpublic java.lang.Class<?> getCommonPropertyType(ELContext context, java.lang.Object base)
String.class, since a bean name is a String.getCommonPropertyType in class ELResolvercontext - The context of this evaluation.base - null.String.class.