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.util.Enumeration getAttributes()
          Enumerate the attributes
 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.
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

getAttributes


public java.util.Enumeration getAttributes()
Enumerate the attributes
Returns:
An enumeration of the attributes in a TagData