Searching in file and looking for the next occurence

Question

Hello!
I have a problem when searching in a text file. I want to find a specific occurence of an element and next time I perform the serach fint the next occurence. One problem is that the file is in some large (>1Gb) I cant get it to work. Please look at my snippet below:
n = 0;
            do {
                if (bufReader.read() == -1)
                        break;
    do {
                line = bufReader.readLine();             
                if (line.indexOf(s) !=-1){        
                n = bufReader.getLineNumber();
                System.out.println("Next:" + next);
                bufReader.mark(500);
    } while (n != bufReader.getLineNumber());
                if (next < n){
                    bufReader.reset();
                    line = bufReader.readLine();
                    if (line.indexOf(s) !=-1) next = bufReader.getLineNumber();   
              } while (next > n);               
                if (line == null) return;

Answer 1

I had already explored the Time Series algorithm and the predictions are not what i wanted as i do not have the month and day sepecifications. The only measure i have is a year and a total for that year. And i have 5 years of historical data. 
I was an easy solution. In excel we predict using Linear Expression and that is not something which is straight drag and drop in the OLAP World !! The dataset that i was using with the logic of "scenario" etc was incorrect. Cleanup the fact table (measures)
and make it appear like this:-
The factsummary table looks like below:-
DateKey     FiscalYear  total       
20100101    2010        19000    
20110101    2011        19700    
20120101    2012        19800    
20130101    2013        19666    
20140101    2014        19444    
Write an MDX Expression as below and thats about it !!
WITH
MEMBER Measures.[Total Sales Forecast] AS
LinRegPoint(
Rank(                [Date].[Calendar].CurrentMember,                [Date].[Calendar].CurrentMember.LEVEL.MEMBERS),
Descendants(         [Date].[Calendar].[Calendar Year],              [Date].[Calendar].CurrentMember.LEVEL),
[Measures].[Total],
Rank(                [Date].[Calendar].CurrentMember,                [Date].[Calendar].CurrentMember.LEVEL.MEMBERS))
,FORMAT_STRING="#,0"
SELECT 
DESCENDANTS(         [Date].[Calendar].[Calendar Year],              [Date].[Calendar].[Year]) ON COLUMNS,
{                    [Measures].[Total],                             Measures.[Total Sales Forecast]} ON ROWS
FROM [Adventure Works]
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