jelly:core

The core Tags from the JSTL plus Jelly extensions.

       <j:getStatic var="closeOperation" className="javax.swing.JFrame"field="EXIT_ON_CLOSE"/>
    

       <j:new className="com.acme.Person" var="person"/> <j:setProperties object="${person}" name="James" location="${loc}"/>
    

       <j:useBean var="person" class="com.acme.Person" name="James" location="${loc}"/> <j:useBean var="order" class="${orderClass}" amount="12" price="123.456"/>
    

core:arg

An argument to a org.apache.commons.jelly.tags.core.NewTagor org.apache.commons.jelly.tags.core.InvokeTag.This tag MUST be enclosed within an org.apache.commons.jelly.tags.core.ArgTagParentimplementation.

core:break

A tag which terminates the execution of the current <forEach>or &lg;while>loop. This tag can take an optional boolean test attribute which if its truethen the break occurs otherwise the loop continues processing.

core:case

A tag which conditionally evaluates its body ifmy valueattribute equals my ancestor <switch>tag's "on"attribute.This tag must be contained within the body of some <switch>tag.

core:catch

A tag which catches exceptions thrown by its body.This allows conditional logic to be performed based on if exceptionsare thrown or to do some kind of custom exception logging logic.

core:choose

A tag which conditionally evaluates its body based on some condition

core:default

A tag which conditionally evaluates its body ifnone of its preceeding sibling <case>tags have been evaluated.This tag must be contained within the body of some <switch>tag.

core:expr

A tag which evaluates an expression

core:file

A tag that pipes its body to a file denoted by the name attribute or to an in memory Stringwhich is then output to a variable denoted by the var variable.

core:forEach

Iterates over a collection, iterator or an array of objects.Uses the same syntax as the JSTL forEach tag does.

core:getStatic

A tag which can retrieve the value of a static field of a given class.The following attributes are required:

• var - The variable to which to assign the resulting value.
• field - The name of the static field to retrieve.
• className - The name of the class containing the static field.

       <j:getStatic var="closeOperation" className="javax.swing.JFrame"field="EXIT_ON_CLOSE"/>
    

core:if

A tag which conditionally evaluates its body based on some condition

core:import

Imports another script.

By default, the imported script does not have access tothe parent script's variable context. This behaviourmay be modified using the inherit attribute.

core:include

A tag which conditionally evaluates its body based on some condition

core:invoke

A tag which calls a method in an object instantied by core:new

core:invokeStatic

A Tag which can invoke a static method on a class, without aninstance of the class being needed.

Like the

The following attributes are required:

• var - The variable to assign the return of the method call to
• method - The name of the static method to invoke
• className - The name of the class containing the static method

core:jelly

The root Jelly tag which should be evaluated first

core:mute

A tag which executes its body but passing no output.

Using this tag will still take the time to perform toString on each objectreturned to the output (but this toString value is discarded.A future version should go more internally so that this is avoided.

core:new

A tag which creates a new object of the given type

core:otherwise

The otherwise block of a choose/when/otherwise group of tags

core:parse

Parses the output of this tags body or of a given String as a Jelly scriptthen either outputting the Script as a variable or executing the script.

core:remove

A tag which removes the variable of the given name from the current variable scope.

core:scope

A tag which creates a new child variable scope for its body.So any variables defined within its body will no longer be in scopeafter this tag.

core:set

A tag which sets a variable from the result of an expression

core:setProperties

A tag which sets the bean properties on the given bean.So if you used it as follows, for example using the <j:new>tag.

       <j:new className="com.acme.Person" var="person"/> <j:setProperties object="${person}" name="James" location="${loc}"/>
    

This tag can also be nested inside a bean tag such as the <useBean>tagor a JellySwing tag to set one or more properties, maybe inside some conditionallogic.

core:switch

Executes the child <case>tag whose value equals my on attribute.Executes a child <default>tag when present and no <case>tag hasyet matched.

core:thread

A tag that spawns the contained script in a separate thread

core:useBean

A tag which instantiates an instance of the given classand then sets the properties on the bean.The class can be specified via a java.lang.Classinstance ora String which will be used to load the class using either the currentthread's context class loader or the class loader used to load thisJelly library.This tag can be used it as follows,

       <j:useBean var="person" class="com.acme.Person" name="James" location="${loc}"/> <j:useBean var="order" class="${orderClass}" amount="12" price="123.456"/>
    

core:useList

A tag which creates a List implementation and optionallyadds all of the elements identified by the items attribute.The exact implementation of List can be specified via theclass attribute

core:when

A tag which conditionally evaluates its body based on some condition

core:while

A tag which performs an iteration while the result of an expression is true.

core:whitespace

A simple tag used to preserve whitespace inside its body