java - Understanding the difference between Cursor API and Iterator API of StAX -

-

ok, when learning how process xml stax api. saw has 2 ways xml document parsed namely:

  • cursor api
  • iterator api

    • the cursor api use xmlstreamreader , it's next() , hasnext() methods.
    iterator api uses xmleventreader in same way above.

    the book sums iterator api in paragraph not quite descriptive. says use when want see event come next , based on value of xmlevent, can use xmlstreamreader skip or process upcoming event.

    i unable head around this. please explain how?

    sscce cursor api 

    import javax.xml.stream.*; import javax.xml.stream.events.*; import java.io.*;  public class staxcursordemo{     public static void main(string[] args){         try{             xmlinputfactory inputfactory = xmlinputfactory.newinstance();             inputstream input = new fileinputstream(new file("helloworld.xml"));             xmlstreamreader xmlstreamreader = inputfactory.createxmlstreamreader(input);              while(xmlstreamreader.hasnext()){                 int event = xmlstreamreader.next();                 if(event == xmlstreamconstants.start_document){                     system.out.println("beginning parsing of document");                 }                 if(event == xmlstreamconstants.end_document){                     system.out.println("ending parsing of document");                 }                 if(event == xmlstreamconstants.comment){                     system.out.println("note: " + xmlstreamreader.gettext());                 }                 if(event == xmlstreamconstants.start_element){                     system.out.println("beginning element: " + xmlstreamreader.getlocalname());                     for(int = 0;i<xmlstreamreader.getattributecount();i++){                         system.out.println("attribute is: " + xmlstreamreader.getattributelocalname(i));                         system.out.println("attribute value is: " + xmlstreamreader.getattributevalue(i));                     }                 }                 if(event == xmlstreamconstants.end_element){                     system.out.println("end element: ");                 }                 if(event == xmlstreamconstants.characters){                     system.out.println("value: " + xmlstreamreader.gettext());                 }             }         }catch(factoryconfigurationerror e){             system.out.println(e.getmessage());         }catch(xmlstreamexception e){             system.out.println(e.getmessage());         }catch(ioexception e){             system.out.println(e.getmessage());         }     } }

    maybe there more it, xmleventreader delivers xmlevent-objects give little more flexibility , functionality whereas xmlstreamreader not create these objects you.

    therefore, xmlstreamreader performing better while xmleventreader gives more functionality out of box.


    Comments

    Post a Comment

    Popular posts from this blog

    Perl - how to grep a block of text from a file -

    -
    it can in xml or text format. how in general grep block of text in perl? <track type="ws"> <range> <rangestart>0</rangestart> <rangeend>146.912</rangeend> <locationindex>0</locationindex> <propertyindex>0</propertyindex> </range> </track> <track type="ps" id="1"> <range> <rangestart>0</rangestart> <rangeend>146.912</rangeend> <locationindex>1</locationindex> <propertyindex>1</propertyindex> </range> </track> i want grep type="ps" , till </range> . one solution open file, read line line , match block. open(fh, "file.txt"); foreach $line (<fh>) { if ($line =~ m/type="cc"(.*?)<\/range>/) { print $1; } } but there more optimal solution without reading file line l
    Read more

    delphi - How to remove all the grips on a coolbar if I have several coolbands? -

    -
    Image
    if set mycoolbar.fixedorder true,only grip on first band hidden. well,if use delphi 7 create vcl forms application,then put coolbar on , create 3 coolbans hold other controls,only grip , top coolbands can hidden setting mycoolbar.fixedorder:=true. i've uploaded picture make things clear. you got fixedorder property wrong. fixed property not allow bands rearranged if set true . setting property of coolbar true keep user changing bands order @ runtime, user can still move , resize bands. can give advice can do, actual solution problem, well, have wait answer. my advice use 3 coolbars in row , setting "fixedorder" property true , bandborderstyle bsnone . way grip hidden on of them. about property, it's not bug of ide, actual preference of property.
    Read more

    javascript - Animating array of divs; only the final element is modified -

    -
    this baffling me @ moment. i'm experienced programmer looking throw bit of surprise fiancee on countdown page our wedding. desired effect simulated confetti falling behind main page. setup follows: i have array of divs in javascript. each div absolutely positioned on page. have interval set updates every 50 or milliseconds. on each tick, run loop on array of divs, , calculations , update positions. problem problem having, however, though can see divs created, stored array, , modified (in case, each has slight randomized rotation) during initialization phase, once tick update position starts, div stored in whatever last slot of array gets position updated. tried hard-coding each div index testing purposes, strictly last element update position. upon printing current "left" , "top" style values each div before , after calculations shows value has been changed, no visible change noticeable. here's basic code: javascript var container;
    Read more