javax.servlet.jsp.tagext: public class: TagData

javax.servlet.jsp.tagext
public class: TagData [javadoc | source]

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

All Implemented Interfaces:
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
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:

public TagData(Object[][] atts)
{ if (atts == null) { attributes = new Hashtable< String, Object >(); } else { attributes = new Hashtable< String, Object >(atts.length); } if (atts != null) { for (int i = 0; i < atts.length; i++) { attributes.put((String) atts[i][0], atts[i][1]); } } }
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.
public TagData(Hashtable<String, Object> attrs)
{ this.attributes = 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 from javax.servlet.jsp.tagext.TagData Summary:
getAttribute, getAttributeString, getAttributes, getId, setAttribute
Methods from java.lang.Object:
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
Method from javax.servlet.jsp.tagext.TagData Detail:

public Object getAttribute(String attName)
{ return attributes.get(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 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.
public String getAttributeString(String attName)
{ Object o = attributes.get(attName); if (o == null) { return null; } else { return (String) o; } }
Get the value for a given attribute.
public Enumeration<String> getAttributes()
{ return attributes.keys(); }
Enumerates the attributes.
public String getId()
{ return getAttributeString(TagAttributeInfo.ID); }
The value of the tag's id attribute.
public void setAttribute(String attName, Object value)
{ attributes.put(attName, value); }
Set the value of an attribute.