Spec-Zone .ru
спецификации, руководства, описания, API
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java.lang.Object javax.el.ELResolver javax.servlet.jsp.el.ImplicitObjectELResolver
public class ImplicitObjectELResolver
Определяет переменное поведение разрешения для ЭЛЬ неявных объектов, определенных в спецификации JSP.
Следующие переменные разрешаются этим ELResolver
, согласно спецификации JSP:
pageContext
- PageContext
объект.pageScope
- a Map
это отображает определяющие контекст страницей названия атрибута на их значения.requestScope
- a Map
это отображает определяющие контекст запросом названия атрибута на их значения.sessionScope
- a Map
это отображает определяющие контекст сеансом названия атрибута на их значения.applicationScope
- a Map
это отображает определяющие контекст приложением названия атрибута на их значения.param
- a Map
это отображает названия параметра к единственному Строковому значению параметра (полученный, вызывая ServletRequest.getParameter(String name)).
paramValues
- a Map
that maps parameter names to a String[]
of all values for that parameter (obtained by calling ServletRequest.getParameterValues(String name))
.header
- a Map
that maps header names to a single String header value (obtained by calling HttpServletRequest.getHeader(String name))
.headerValues
- a Map
that maps header names to a String[]
of all values for that header (obtained by calling HttpServletRequest.getHeaders(String))
.cookie
- a Map
that maps cookie names to a single Cookie
object. Cookies are retrieved according to the semantics of HttpServletRequest.getCookies()
. If the same name is shared by multiple cookies, an implementation must use the first one encountered in the array of Cookie
objects returned by the getCookies()
method. However, users of the cookie implicit object must be aware that the ordering of cookies is currently unspecified in the servlet specification.initParam
- a Map
that maps context initialization parameter names to their String parameter value (obtained by calling ServletContext.getInitParameter(String name))
.
ELResolver
Field Summary |
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Fields inherited from class javax.el.ELResolver |
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RESOLVABLE_AT_DESIGN_TIME, TYPE |
Constructor Summary | |
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ImplicitObjectELResolver()
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Method Summary | |
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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 , and the property matches the name of a JSP implicit object, returns an Iterator containing FeatureDescriptor objects with information about each JSP implicit object resolved by this resolver. |
java.lang.Class |
getType(ELContext context, java.lang.Object base, java.lang.Object property)
If the base object is null , and the property matches the name of a JSP implicit object, returns null to indicate that no types are ever accepted to setValue() . |
java.lang.Object |
getValue(ELContext context, java.lang.Object base, java.lang.Object property)
If the base object is null , and the property matches the name of a JSP implicit object, returns the implicit object. |
boolean |
isReadOnly(ELContext context, java.lang.Object base, java.lang.Object property)
If the base object is null , and the property matches the name of a JSP implicit object, returns true to indicate that implicit objects cannot be overwritten. |
void |
setValue(ELContext context, java.lang.Object base, java.lang.Object property, java.lang.Object val)
If the base object is null , and the property matches the name of a JSP implicit object, throws PropertyNotWritableException to indicate that implicit objects cannot be overwritten. |
Methods inherited from class javax.el.ELResolver |
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вызвать |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public ImplicitObjectELResolver()
Method Detail |
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public java.lang.Object getValue(ELContext context, java.lang.Object base, java.lang.Object property)
null
, and the property matches the name of a JSP implicit object, returns the implicit object. The propertyResolved
property of the ELContext
object must be set to true
by this resolver before returning if an implicit object is matched. If this property is not true
after this method is called, the caller should ignore the return value.
getValue
in class ELResolver
context
- 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 implicit object to resolve. propertyResolved
property of ELContext
was set to true
, then the implicit object; 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 getType(ELContext context, java.lang.Object base, java.lang.Object property)
null
, and the property matches the name of a JSP implicit object, returns null
to indicate that no types are ever accepted to setValue()
. The propertyResolved
property of the ELContext
object must be set to true
by this resolver before returning if an implicit object is matched. If this property is not true
after this method is called, the caller should ignore the return value.
getType
in class ELResolver
context
- 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 implicit object to resolve. propertyResolved
property of ELContext
was set to true
, then null
; 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
, and the property matches the name of a JSP implicit object, throws PropertyNotWritableException
to indicate that implicit objects cannot be overwritten. The propertyResolved
property of the ELContext
object must be set to true
by this resolver before returning if an implicit object is matched. If this property is not true
after this method is called, the caller should ignore the return value.
setValue
in class ELResolver
context
- 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 implicit object.val
- The value to be associated with the implicit object. java.lang.NullPointerException
- if context is null
. PropertyNotWritableException
- always thrown, if the implicit object name is recognized by this resolver. 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
, and the property matches the name of a JSP implicit object, returns true
to indicate that implicit objects cannot be overwritten. The propertyResolved
property of the ELContext
object must be set to true
by this resolver before returning if an implicit object is matched. If this property is not true
after this method is called, the caller should ignore the return value.
isReadOnly
in class ELResolver
context
- 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 implicit object. propertyResolved
property of ELContext
was set to true
, then true
; 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
, and the property matches the name of a JSP implicit object, returns an Iterator
containing FeatureDescriptor
objects with information about each JSP implicit object resolved by this resolver. Otherwise, returns null
. The Iterator
returned must contain one instance of FeatureDescriptor
for each of the EL implicit objects defined by the JSP spec. Each info object contains information about a single implicit object, and is initialized as follows:
false
false
true
FeatureDescriptor
s: ELResolver#TYPE
- The runtime type of the implicit object.ELResolver#RESOLVABLE_AT_DESIGN_TIME
- true
.
getFeatureDescriptors
in class ELResolver
context
- 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 implicit object, 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 ELResolver
context
- 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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ПРЕДЫДУЩИЙ КЛАСС СЛЕДУЮЩИЙ КЛАСС | ФРЕЙМЫ НИКАКИЕ ФРЕЙМЫ | ||||||||
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Generated on 10-February-2011 12:41