6.1.5
JspEngineInfo
The 
JspEngineInfo
 class provides information on the JSP container implementation. The 
only method currently available is:
getSpecificationVersion()
Returns a String in Dewey decimal describing the highest version of the JSP 
specification implemented by the JSP container. See the 
java.lang.Package
 class in the Java 2 platform for other methods that 
may
 appear in this class in future specifications.
6.1.6
JspFactory
The 
JspFactory
 provides a mechanism to instantiate platform dependent objects in a 
platform independent manner. The 
PageContext
 class and the JspEngineInfo class are the 
only implementation dependent classes that can be created from the factory.
Typically at initialization time, a JSP container will call the static 
setDefaultFactory()
 method in order to register it's own factory implementation. JSP 
page implementation classes will use the 
getDefaultFactory()
 method in order to 
obtain this factory and use it to construct 
PageContext
 instances in order to process client 
requests.
JspFactory objects are not intended to be used by JSP page authors.
6.2
Package javax.servlet.jsp.tagext
The classes in the javax.servlet.jsp.tagext package are related to the Tag Extension 
mechanism. They are described in detail in Chapter 5.  In this section we will just briefly 
review and group them.
A brief description of the classes follows.  Classes whose name ends in Info are translation 
time classes.  Instances that are initialized from the Tag Library Descriptor are in bold italics:
BodyContent
Encapsulates the evaluation of a tag body.
Tag
The interface of a tag handler for an action that does not want to manipulate its body.
BodyTag
The interface of a tag handler for an action that wants to manipulate its body.
TagSupport
A base class for defining new tag handlers implementing Tag.
BodyTagSupport
A base class for defining new tag handlers implementing BodyTag.
TagAttributeInfo
:
Information on the attributes of a tag.
121
JavaServer Pages 1.1 Specification  
November 30, 1999




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