Bug 109041 [implementation] Occurrence finders should not compute current node each time
I20050906-1200 This is a minor performance improvement item: currently each occurrence finder computes the node at the caret location via NodeFinder. It would be more efficient to compute the node once and initialize each occurrence finder with that node.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/search/ExceptionOccurrencesFinder.java
int line= document.getLineOfOffset(startPosition);
				Integer lineInteger= new Integer(line);
				ExceptionOccurrencesGroupKey groupKey= (ExceptionOccurrencesGroupKey) lineToLineElement.get(lineInteger);
				if (groupKey == null) {
					IRegion region= document.getLineInformation(line);
					String lineContents= document.get(region.getOffset(), region.getLength()).trim();
					groupKey= new ExceptionOccurrencesGroupKey(element, line, lineContents, isException);
					lineToLineElement.put(lineInteger, groupKey);
				} else if (isException) {
					
					groupKey.setException(true);
				}
				Match match= new Match(groupKey, startPosition, length);
				resultingMatches.add(match);
			} catch (BadLocationException e) {
				
			}
		}
	}
		
	public String getJobLabel() {
		return SearchMessages.ExceptionOccurrencesFinder_searchfor ; 
	}
	
	public String getPluralLabel(String elementName) {
		String[] args= new String[] {ASTNodes.asString(fSelectedName), "{0}", elementName}; 
		return Messages.format(SearchMessages.ExceptionOccurrencesFinder_label_plural, args); 
	}
	
	public String getSingularLabel(String elementName) {