How to resort a collection in Java?

StackOverflow https://stackoverflow.com/questions/13044215

  •  14-07-2021
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Question

I try make a project to write data from .mif/.tab files to Data Base using GDAL/OGR. I do:

SimpleFeatureBuilder featureBuilder = new SimpleFeatureBuilder(dbFeatureType);
SimpleFeatureCollection collection = FeatureCollections.newCollection();
while (mifReader.hasNext()){      
  in = (SimpleFeatureImpl) mifReader.next();
  SimpleFeature dbFeature = featureBuilder.buildFeature(null);
  for(AttributeDescriptor ad : adList){
    String name = ad.getLocalName();
    Object attrValue;
    attrValue = in.getAttribute(name);
    if(attrValue instanceof String){
      String string3 = new String((attrValue.toString()).getBytes("ISO-8859-1"), "cp1251");
      if(name.trim().equalsIgnoreCase(kadname.trim())){
        dbFeature.setAttribute("kadnum", string3);
      }
    }
    if (attrValue instanceof Geometry){
        idn++;
        com.vividsolutions.jts.geom.Geometry geom = (Geometry) in.getAttribute(name);
        dbFeature.setAttribute("id", idn);
        System.out.println("after insrt="+idn);
        dbFeature.setAttribute("deleted", deleted);
        dbFeature.setAttribute("the_geom", geom);
        dbFeature.setAttribute("status_id", status_id);

    }
    collection.add(dbFeature);
    }
}

Its simple data from .mid file: 

__id_|___kadnum_____

  3,"66:2:00:88 951"
  4,"66:2:00:88 952"
  5,"66:2:00:88 954"

And in db i get this:

enter image description here

My data is 2-4 rows. You see that i get increment variable idn and put it in attribute id. Take a kadnum from .mid and put it in attribute kadnum.
Its fine but in bd i get rows in the wrong order. I mean that element with attribute kadnum=66:2:00:88 951 gonna be in second row in db but it in 4th row.
Its mean that i gonna change the order of items in the collection to the opposite. Its right solvetion? And how to do this? Or GDAL can do it by self?

UPDATE

I have:

 SimplePropertyImpl in =(SimpleFeatureImpl) mifReader.next();

I try:

in.getProperty("id").getName() ;

And i dont get a PropertyName i get a String. What i doing wrong?

Was it helpful?

Solution

Do you want to sort the database rows according to id?

select * from <yourtable> order by id asc;

If you want to sort your FeatureCollection in code, you may want to look into SimpleFeatureCollection.sort and SortBy. I would expect something like

collection.sort( new SortBy() 
                 { 
                     @Override PropertyName getPropertyName() { return YourPropertyNameImpl( "id" ); } 
                     @Override SortOrder getSortOrder() { return SortOrder.ASCENDING; }
                 }

would get you started in the right direction.

Cheers,

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