TagData (Apache Tomcat 7.0.109 API Documentation)

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

All Implemented Interfaces:

Cloneable
```
public class TagData
extends Object
implements Cloneable
```
The (translation-time only) attribute/value information for a tag instance.
TagData is only used as an argument to the isValid, validate, and getVariableInfo methods of TagExtraInfo, which are invoked at translation time.

Field Summary

Fields
Modifier and Type	Field and Description
`static Object`	`REQUEST_TIME_VALUE` Distinguished value for an attribute to indicate its value is a request-time expression (which is not yet available because TagData instances are used at translation-time).

Constructor Summary

Constructors
Constructor and Description

TagData(Hashtable<String,Object> attrs)
Constructor for a TagData.

TagData(Object[][] atts)
Constructor for TagData.

Constructors
Constructor and Description
`TagData(Hashtable<String,Object> attrs)` Constructor for a TagData.
`TagData(Object[][] atts)` Constructor for TagData.

Method Summary

Methods
Modifier and Type	Method and Description
`Object`	`getAttribute(String attName)` The value of the attribute.
`Enumeration<String>`	`getAttributes()` Enumerates the attributes.
`String`	`getAttributeString(String attName)` Get the value for a given attribute.
`String`	`getId()` The value of the tag's id attribute.
`void`	`setAttribute(String attName, Object value)` Set the value of an attribute.

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

- Field Detail
  - REQUEST_TIME_VALUE
```
public static final Object REQUEST_TIME_VALUE
```
    Distinguished value for an attribute to indicate its value is a request-time expression (which is not yet available because TagData instances are used at translation-time).
- Constructor Detail
  - TagData
```
public TagData(Object[][] atts)
```
    Constructor for TagData.
    A typical constructor may be
```
 static final Object[][] att = {{"connection", "conn0"}, {"id", "query0"}};
 static final TagData td = new TagData(att);
 
```
    All values must be Strings except for those holding the distinguished object REQUEST_TIME_VALUE.
    Parameters:
    atts - the static attribute and values. May be null.
  - TagData
```
public TagData(Hashtable<String,Object> attrs)
```
    Constructor for a TagData. If you already have the attributes in a hashtable, use this constructor.
    
    Parameters:
    attrs - A hashtable to get the values from.
- Method Detail
  - getId
```
public String getId()
```
    The value of the tag's id attribute.
    
    Returns:
    the value of the tag's id attribute, or null if no such attribute was specified.
  - getAttribute
```
public Object getAttribute(String attName)
```
    The value of the attribute. If a static value is specified for an attribute that accepts a request-time attribute expression then that static value is returned, even if the value is provided in the body of a <jsp:attribute> action. The distinguished object REQUEST_TIME_VALUE is only returned if the value is specified as a request-time attribute expression or via the <jsp:attribute> action with a body that contains dynamic content (scriptlets, scripting expressions, EL expressions, standard actions, or custom actions). Returns null if the attribute is not set.
    
    Parameters:
    attName - the name of the attribute
    
    Returns:
    the attribute's value
  - setAttribute
```
public void setAttribute(String attName,
                Object value)
```
    Set the value of an attribute.
    
    Parameters:
    attName - the name of the attribute
    value - the value.
  - getAttributeString
```
public String getAttributeString(String attName)
```
    Get the value for a given attribute.
    
    Parameters:
    attName - the name of the attribute
    
    Returns:
    the attribute value string
    
    Throws:
    
    ClassCastException - if attribute value is not a String
  - getAttributes
```
public Enumeration<String> getAttributes()
```
    Enumerates the attributes.
    
    Returns:
    An enumeration of the attributes in a TagData

Class TagData

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

REQUEST_TIME_VALUE

Constructor Detail

TagData

TagData

Method Detail

getId

getAttribute

setAttribute

getAttributeString

getAttributes