org.eclipse.jet.taglib
Interface ConditionalTag

All Superinterfaces:

ContainerTag, CustomTag, EmptyTag

All Known Implementing Classes:

AbstractConditionalTag

public interface ConditionalTag
extends ContainerTag

Interface to a conditional tag. A conditional custom tag:

requires a body (i.e., the form <myConditionalTag/> is an error).

includes or excludes its body content depending on the evaluation of some condition

Methods are called in the following order:

The set*() methods as defined by CustomTag.

doEvalCondition(TagInfo, JET2Context).

If doEvalCondition(TagInfo, JET2Context) returns true, then the body processing methods are called as described in ContainerTag.

Method Summary

boolean

doEvalCondition(TagInfo td, JET2Context context) Evalutate the condition that determines whether the tag's body is to be written to the tags output writer.

Methods inherited from interface org.eclipse.jet.taglib.ContainerTag

doAfterBody, doBeforeBody, setBodyContent

Methods inherited from interface org.eclipse.jet.taglib.EmptyTag

doAction

Method Detail

doEvalCondition

boolean doEvalCondition(TagInfo td,
                        JET2Context context)
                        throws JET2TagException

Evalutate the condition that determines whether the tag's body is to be written to the tags output writer.

Parameters:

td - the tag information (i.e. attribute values)

context - the JET2 execution context

Returns:

true if the body should be included, false otherwise.

Throws:

JET2TagException - if the method cannot execute properly.