Bug 120345 Need a URL generator API from Engine
The Chart Engine needs the ability to generate a viewer URL from an ActionHandle, this can be provided by a Report Engine public API for instance. The URL should usable as is by the viewer without any additional change. The Chart Engine can take care of evaluating the expressions inside the ActionHandle before calling the Report Engine API if necessary.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/executor/ExecutionContext.java
* report object is the script object used in the script context.
	 * 
	 * All infos can get from this object.
	 * 
	 * 
	 */
	private class ReportObject
	{
		/**
		 * get the report design handle
		 * 
		 * @return report design object.
		 */
		public Object getDesign( )
		{
			return scriptContext.eval( "design" );
		}
		/**
		 * get the report document.
		 * 
		 * @return report document.
		 */
		public Object getDocument( )
		{
			return reportDoc;
		}
		/**
		 * @return a map of name/value pairs for all the parameters and their
		 *         values
		 */