I'm migrating to SpringMVC and Apache Tiles 3 from a Strut1 + Tiles project. I know only a little about Struts1+Tiles, it is too old and I'm stuck in Controller and ComponentContext in Struts-tiles. According to document from apache website, it was replaced by ViewPreparer and AttributeContext but I dont know the following line means:
ComponentContext compContext=(ComponentContext)pageContext.getAttribute(ComponentConstants.COMPONENT_CONTEXT,PageContext.REQUEST_SCOPE);
What is ComponentConstants.COMPONENT_CONTEXT? and how to change ComponentContext to AttributeContext
Please Help, Thanks.
Bidi, there are 2 ways of getting an AttributeContext:
The first one, like mck stated: through "org.apache.tiles.AttributeContext.STACK" key of request scope. However, the value is a STACK that contains 2 elements of AttributeContext type. The one we need is the first element. IMHO, this way is limited because since the data structure is a stack, getting also mean removing from the stack according to FIFO rule, so you can use the object for only once.
I am using the second way in my project. Because the execute() method of ViewPreparer already have a parameter of AttributeContext type, and this method is always called each time a page is rendered, so you can use this object to do the thing you want (or put it in request) when overriding the method. AttributeContext is just a collection of key/value pairs. Normally, people use it to get access to some values which are attributes in the template, so fetching the values and putting them to the request can save the overhead. You can also create some static properties of the inheriting class and setting the values to them.