Bug 154325 Use input absolute path as the parameter in error message
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/utility/ParameterAccessor.java
String targetFolder = documentFolder + File.separator + DOCUMENTS_DIR;
		File file = new File( targetFolder );
		boolean success = file.delete( );
		if ( !success )
			deleteDir( file );
	}
	/**
	 * Deletes all files and subdirectories under dir. Returns true if all
	 * deletions were successful. If a deletion fails, the method stops
	 * attempting to delete and returns false.
	 */
	protected static boolean deleteDir( File dir )
	{
		if ( dir.isDirectory( ) )
		{
			String[] children = dir.list( );
			for ( int i = 0; i < children.length; i++ )
			{
				boolean success = deleteDir( new File( dir, children[i] ) );
				if ( !success )
				{
					return false;
				}
			}
		}
		
		return dir.delete( );
	}
	/**
	 * Get report parameter by given name.