java.lang.Object
- javax.servlet.jsp.tagext.TagAttributeInfo

```
public class TagAttributeInfo
extends Object
```
Information on the attributes of a Tag, available at translation time. This class is instantiated from the Tag Library Descriptor file (TLD).
Only the information needed to generate code is included here. Other information like SCHEMA for validation belongs elsewhere.
Note from the Expert Group:
This should have been designed as an interface. Every time we change the TLD, we need to add a new constructor to this class (not good). This class should only be instantiated by container implementations (not by JSP developers).

Field Summary

Fields
Modifier and Type Field and Description

static String ID
"id" is wired in to be ID.

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Constructor Summary

Constructors
Constructor and Description
`TagAttributeInfo(String name, boolean required, String type, boolean reqTime)` Constructor for TagAttributeInfo.
`TagAttributeInfo(String name, boolean required, String type, boolean reqTime, boolean fragment)` JSP 2.0 Constructor for TagAttributeInfo.
`TagAttributeInfo(String name, boolean required, String type, boolean reqTime, boolean fragment, String description, boolean deferredValue, boolean deferredMethod, String expectedTypeName, String methodSignature)` JSP 2.1 Constructor for TagAttributeInfo.

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Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`boolean`	`canBeRequestTime()` Whether this attribute has been specified in the TLD as rtexprvalue.
`String`	`getDescription()` Gets the description string of this tag attribute.
`String`	`getExpectedTypeName()` Returns the name of the expected type (as a String) of this deferred value attribute.
`static TagAttributeInfo`	`getIdAttribute(TagAttributeInfo[] a)` Convenience static method that goes through an array of TagAttributeInfo objects and looks for "id".
`String`	`getMethodSignature()` Returns the expected method signature of this deferred method attribute.
`String`	`getName()` The name of this attribute.
`String`	`getTypeName()` The type (as a String) of this attribute.
`boolean`	`isDeferredMethod()` Returns `true` if this attribute is to be passed a `MethodExpression` so that expression evaluation can be deferred.
`boolean`	`isDeferredValue()` Returns `true` if this attribute is to be passed a `ValueExpression` so that expression evaluation can be deferred.
`boolean`	`isFragment()` Whether this attribute is of type JspFragment.
`boolean`	`isRequired()` Whether this attribute is required.
`String`	`toString()` Returns a String representation of this TagAttributeInfo, suitable for debugging purposes.

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Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Field Detail
  - ID
```
public static final String ID
```
    "id" is wired in to be ID. There is no real benefit in having it be something else IDREFs are not handled any differently.
    
    See Also:
    
    Constant Field Values
- Constructor Detail
  - TagAttributeInfo
```
public TagAttributeInfo(String name,
                        boolean required,
                        String type,
                        boolean reqTime)
```
    Constructor for TagAttributeInfo. This class is to be instantiated only from the TagLibrary code under request from some JSP code that is parsing a TLD (Tag Library Descriptor).
    
    Parameters:
    
    name - The name of the attribute.
    
    required - If this attribute is required in tag instances.
    
    type - The name of the type of the attribute.
    
    reqTime - Whether this attribute holds a request-time Attribute.
  - TagAttributeInfo
```
public TagAttributeInfo(String name,
                        boolean required,
                        String type,
                        boolean reqTime,
                        boolean fragment)
```
    JSP 2.0 Constructor for TagAttributeInfo. This class is to be instantiated only from the TagLibrary code under request from some JSP code that is parsing a TLD (Tag Library Descriptor).
    
    Parameters:
    
    name - The name of the attribute.
    
    required - If this attribute is required in tag instances.
    
    type - The name of the type of the attribute.
    
    reqTime - Whether this attribute holds a request-time Attribute.
    
    fragment - Whether this attribute is of type JspFragment
    
    Since:
    
    JSP 2.0
  - TagAttributeInfo
```
public TagAttributeInfo(String name,
                        boolean required,
                        String type,
                        boolean reqTime,
                        boolean fragment,
                        String description,
                        boolean deferredValue,
                        boolean deferredMethod,
                        String expectedTypeName,
                        String methodSignature)
```
    JSP 2.1 Constructor for TagAttributeInfo. This class is to be instantiated only from the TagLibrary code under request from some JSP code that is parsing a TLD (Tag Library Descriptor).
    
    Parameters:
    
    name - The name of the attribute.
    
    required - If this attribute is required in tag instances.
    
    type - The name of the type of the attribute.
    
    reqTime - Whether this attribute holds a request-time Attribute.
    
    fragment - Whether this attribute is of type JspFragment
    
    description - The description of the attribute.
    
    deferredValue - Whether this attribute is a deferred value.
    
    deferredMethod - Whether this attribute is a deferred method. rtexpr or deferred value.
    
    expectedTypeName - The name of the expected type of this deferred value (or null if this is not a deferred value).
    
    methodSignature - The expected method signature of this deferred method (or null if this is not a deferred method).
    
    Since:
    
    JSP 2.1
- Method Detail
  - getName
```
public String getName()
```
    The name of this attribute.
    
    Returns:
    
    the name of the attribute
  - getTypeName
```
public String getTypeName()
```
    The type (as a String) of this attribute.
    This method must return "javax.el.ValueExpression" if isDeferredValue() returns true and canBeRequestTime() returns false. It must return "javax.el.MethodExpression" if isDeferredMethod() returns true. It must return "java.lang.Object" if isDeferredValue() returns true and canBeRequestTime() returns true.
    
    Returns:
    
    the type of the attribute
  - canBeRequestTime
```
public boolean canBeRequestTime()
```
    Whether this attribute has been specified in the TLD as rtexprvalue. If true, this means the attribute can hold a request-time value.
    
    Returns:
    
    true if the attribute has been specified in the TLD as rtexprvalue
  - isRequired
```
public boolean isRequired()
```
    Whether this attribute is required.
    
    Returns:
    
    if the attribute is required.
  - getIdAttribute
```
public static TagAttributeInfo getIdAttribute(TagAttributeInfo[] a)
```
    Convenience static method that goes through an array of TagAttributeInfo objects and looks for "id".
    
    Parameters:
    
    a - An array of TagAttributeInfo
    
    Returns:
    
    The TagAttributeInfo reference with name "id"
  - isFragment
```
public boolean isFragment()
```
    Whether this attribute is of type JspFragment.
    
    Returns:
    
    if the attribute is of type JspFragment
    
    Since:
    
    JSP 2.0
  - getDescription
```
public String getDescription()
```
    Gets the description string of this tag attribute.
    
    Returns:
    
    the description string of this tag attribute
  - isDeferredValue
```
public boolean isDeferredValue()
```
    Returns true if this attribute is to be passed a ValueExpression so that expression evaluation can be deferred.
    If this method returns true, then getTypeName() must return "javax.el.ValueExpression".
    
    The getExpectedType() method can be used to retrieve the expected type this value expression will be constructed with.
    
    Returns:
    
    true if this attribute accepts a deferred value; false otherwise.
    
    Since:
    
    JSP 2.1
  - isDeferredMethod
```
public boolean isDeferredMethod()
```
    Returns true if this attribute is to be passed a MethodExpression so that expression evaluation can be deferred.
    If this method returns true, then getTypeName() must return "javax.el.MethodExpression".
    
    The getMethodSignature() method can be used to retrieve the expected method signature this method expression will be constructed with.
    
    Returns:
    
    true if this attribute accepts a deferred method; false otherwise.
    
    Since:
    
    JSP 2.1
  - getExpectedTypeName
```
public String getExpectedTypeName()
```
    Returns the name of the expected type (as a String) of this deferred value attribute.
    This method returns null if isDeferredValue() returns false.
    
    Returns:
    
    the name of the expected type
    
    Since:
    
    JSP 2.1
  - getMethodSignature
```
public String getMethodSignature()
```
    Returns the expected method signature of this deferred method attribute.
    This method returns null if isDeferredMethod() returns false.
    
    Returns:
    
    the method signature
    
    Since:
    
    JSP 2.1
  - toString
```
public String toString()
```
    Returns a String representation of this TagAttributeInfo, suitable for debugging purposes.
    
    Overrides:
    
    toString in class Object
    
    Returns:
    
    a String representation of this TagAttributeInfo

Nederlandse vertaling

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Als je me wilt helpen met vertalingen, is je bijdrage welkom. Het enige dat u hoeft te doen, is u op de site registreren en mij een bericht sturen waarin u wordt gevraagd om u toe te voegen aan de groep vertalers, zodat u de gewenste pagina's kunt vertalen. Een link onderaan elke vertaalde pagina geeft aan dat u de vertaler bent en heeft een link naar uw profiel.

Bij voorbaat dank.

Document heeft de 11/06/2005 gemaakt, de laatste keer de 18/08/2025 gewijzigd
Bron van het afgedrukte document:https://www.gaudry.be/nl/java-api-javaee-rf-javax/servlet/jsp/tagext/TagAttributeInfo.html

De infobrol is een persoonlijke site waarvan de inhoud uitsluitend mijn verantwoordelijkheid is. De tekst is beschikbaar onder CreativeCommons-licentie (BY-NC-SA). Meer info op de gebruiksvoorwaarden en de auteur.

Referenties

Manuel PHP : https://docs.oracle.com, TagAttributeInfo (Java(TM) EE 7 Specification APIs)

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De auteur van deze site is als enige verantwoordelijk voor de manier waarop de verschillende concepten, en de vrijheden die met de referentiewerken worden genomen, hier worden gepresenteerd. Vergeet niet dat u meerdere broninformatie moet doorgeven om het risico op fouten te verkleinen.

Class TagAttributeInfo

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

ID

Constructor Detail

TagAttributeInfo

TagAttributeInfo

TagAttributeInfo

Method Detail

getName

getTypeName

canBeRequestTime

isRequired

getIdAttribute

isFragment

getDescription

isDeferredValue

isDeferredMethod

getExpectedTypeName

getMethodSignature

toString

Referenties