Interesting data structure / algorithm question for mapping the Visual elements

Hi all. I'm doing a text of some data GUI display. Data is an array of items. The Visual is basically a text display; to simplify, let's say that an array of strings. It sounds easy so far, right? You can imagine it like this:

Object data [];
VisualRepresentation String().

Well, I have a problem which becomes more difficult when the amount of data becomes much more. Some items will require more than one line of text for each data item. Thus, getLine() is not a simple 1:1 mapping of the index between [] and [visualRepresentation] data. In this case, visualRepresentation is going to be as big or bigger than the data, because there is at least 1 point in visualRepresentation for each data element, but maybe more. You have a GUI that has this method:

getLine (int index) {return visualRepresentation [index] ;}

Imagine the problem of the visualRepresentation to the data mapping. If something changes to where the Visual representation ranges from 1 to 2 lines, you will need to insert an element into the visualRepresentation table. If you have 1 million points, it's really expensive. Also, imagine that you do not want to create table visualRepresentation INTEGER being given that you only need to display 50 points or less on the screen at once.

So, here's my problem. I don't want to create the visualRepresentation entire items table for the whole million (or other) data, I want to create upon request. What is the best way to address the issue, because I want a getLine (index) method? A very brutal method would be to count the WHOLE table between 0 and the index on each call to getLine(). It would be expensive and practically unworkable. An alternative would be to include a mapping of the data lines to visualRepresentation for each item of data []. The problem, it would be that each insertion of a visualRepresentation line would need an update to each map element in all of the following. So, if a row is inserted to the 500 index in an array of 1000 elements, you should update all 500 points after index 500.

Any ideas?

I was thinking another item in MyObject, which would be the sum of the account line in all prerequisites. You will need to update on average N/2 people when you insert or delete a line, that is, every point of this line up. Then you can binary-chop on this point to find what array index contains the index of the desired line, which gives you your O (log N), and then go o (1) from here inside the current element list, by subtracting the total cumulative index required of course. The downside of this is the execution of o (n) on the addition and deletion of rows.

Tags: Java

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