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javax.servlet.jsp.tagext

Class TagData

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.

Nested Class Summary

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(atts[][] )
Constructor for TagData.
TagData(java.util.Hashtable attrs)
Constructor for a TagData.

Method Summary

java.lang.Object
getAttribute(java.lang.String attName)
The value of the attribute.
java.lang.String
getAttributeString(java.lang.String attName)
Get the value for a given attribute.
java.util.Enumeration
getAttributes()
Enumerates the attributes.
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.

Field Details

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 Details

TagData

public TagData(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:

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 Details

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

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

getId

public java.lang.String getId()
The value of the id attribute, if available.

Returns:
the value of the id attribute or null

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.

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