javax.servlet.jsp.tagext
Class TagData

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

public class TagData

extends java.lang.Object

implements java.lang.Cloneable

Tag instance attribute(s)/value(s); often this data is fully static in the case where none of the attributes have runtime expresssions as their values. Thus this class is intended to expose an immutable interface to a set of immutable attribute/value pairs. This class is cloneable so implementations can create a static instance and then just clone it before adding the request-time expressions.

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 this TagData instance is being used at translation-time.

Constructor Summary

TagData(java.util.Hashtable attrs)
Constructor for a TagData If you already have the attributes in a hashtable, use this constructor.

TagData(java.lang.Object[][] atts)
Constructor for a TagData For simplicity and speed, we are just using primitive types.

Method Summary

java.lang.Object	getAttribute(java.lang.String attName)
java.lang.String	getAttributeString(java.lang.String attName)
java.lang.String	getId()
void	setAttribute(java.lang.String attName, java.lang.Object value) Set the value of this attribute to be

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 this TagData instance is being used at translation-time.

Constructor Detail

TagData

public TagData(java.lang.Object[][] atts)

Constructor for a TagData For simplicity and speed, we are just using primitive types. A typical constructor may be static final Object[][] att = {{"connection", "conn0"}, {"id", "query0"}}; static final TagData td = new TagData(att); In an implementation that uses the clonable approach sketched above 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. NEED TO REMOVE THIS COMMENT: JUST FOR pelegri/lpgc's eyes **** Since the JSP translator internally has attributes in a hashtable whenever a TagData needs to be constructed at translation time, this constructor is used... akv

Method Detail

getId

public java.lang.String getId()

Returns:

the value of the id attribute or null

getAttribute

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

Returns:

the attribute's value object. Returns the distinguished object REQUEST_TIME_VALUE if the value is request time and we are using TagData at translation time. Returns null if the attribute is not set.

setAttribute

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

Set the value of this attribute to be

getAttributeString

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

Returns:

the attribute value string