javax.servlet.jsp.tagext
Class TagData

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

All Implemented Interfaces:

java.lang.Cloneable

public class TagData

extends java.lang.Object

implements java.lang.Cloneable

The (translation-time only) attribute/value information for a tag instance.

TagData is only used as an argument to the isValid and getVariableInfo methods of TagExtraInfo, which are invoked at translation time.

Class-Level Live Code Examples:
Code examples whose scope spans several methods in this class belong here. Code examples that illustrate how to use specific constructors and methods are found in the Constructor Detail and Method Detail sections below.

Field Summary

static java.lang.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

TagData(java.util.Hashtable attrs)
Constructor for a TagData.

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

Method Summary

java.lang.Object	getAttribute(java.lang.String attName) The value of the attribute.
java.util.Enumeration	getAttributes() Enumerates the attributes.
java.lang.String	getAttributeString(java.lang.String attName) Get the value for a given attribute.
java.lang.String	getId() The value of the id attribute, if available.
void	setAttribute(java.lang.String attName, java.lang.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 java.lang.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(java.lang.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(java.util.Hashtable 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 java.lang.String getId()

The value of the id attribute, if available.

Returns:

the value of the id attribute or null

getAttribute

public java.lang.Object getAttribute(java.lang.String attName)

The value of the attribute. Returns the distinguished object REQUEST_TIME_VALUE if the value is request time. Returns null if the attribute is not set.

Returns:

the attribute's value object

setAttribute

public void setAttribute(java.lang.String attName,
                         java.lang.Object value)

Set the value of an attribute.

Parameters:

attName - the name of the attribute

value - the value.

getAttributeString

public java.lang.String getAttributeString(java.lang.String attName)

Get the value for a given attribute.

Returns:

the attribute value string

getAttributes

public java.util.Enumeration getAttributes()

Enumerates the attributes.

Returns:

An enumeration of the attributes in a TagData