I need to filter a list with a large amount of objects. For each of these objects I need to verify if any of the parameters contain one of the words that are in other lists. I have developed a method to do this, but it is taking too long, I would like to know if there is a more efficient way to do this.
The main idea could be written in sql for better understanding:
SELECT * FROM PROJECT P WHERE P.NAME LIKE "%JAVA%" OR P.NAME LIKE "%PASCAL%" OR P.PRODUCT LIKE "%JAVA%" OR P.PRODUCT LIKE "%PASCAL% OR. P.ADDRESS LIKE "%JAVA" OR P.ADDRESS LIKE "%PASCAL%";
In Java I wrote in this way:
private List<Projeto> filtraResultado(List<Projeto> projetosAssinados, String[] filtros){
List<Projeto> result = new ArrayList<Projeto>();
for(Projeto p: projetosAssinados) {
if(existeFiltroBuscadoNosCamposDePesquisa(p.getDsProjeto(), filtros) ||
existeFiltroBuscadoNosCamposDePesquisa(p.getNomeProjeto(), filtros) ||
existeFiltroBuscadoNosCamposDePesquisa(p.getSetor(),filtros) ||
existeFiltroBuscadoNosCamposDePesquisa(p.getUn(), filtros) ||
existeFiltroBuscadoNosCamposDePesquisa(p.getProcessosModelados(),filtros)||
existeFiltroBuscadoNosCamposDePesquisa(p.getServicosPrestados(),filtros) ||
existeFiltroBuscadoNosCamposDePesquisa(p.getTecnologias(),filtros)||
existeFiltroBuscadoNosCamposDePesquisa(p.getDetalhamento(),filtros)) {
result.add(p);
}
}
return result;
}
public boolean existeFiltroBuscadoNosCamposDePesquisa(String campoPesquisado,String[] filtros ){
if(campoPesquisado == null) {
return false;
}
for(String f: filtros) {
if(StringUtils.containsIgnoreCase(campoPesquisado, f.trim())) {
return true;
}
}
return false;
}
For comparing two List
you'd need anyMatch()
and stream between two lists. But if you are checking against a filter
I assume each records on that list are different and this can easily be converted to a use Set
which will reduce time and be lot faster.
For example:
List< String > filterList = Arrays.asList( "z" );
List< String > toCheckList = Arrays.asList( "z", "b", "a", "q", "w" );
boolean contains = toCheckList.stream( ).anyMatch( list -> filterList.stream( ).anyMatch( filter -> StringUtils.containsIgnoreCase( filter, list ) ) );
if ( contains ) {
System.out.println( "Contains" );
//your logic
}
If your filter is a Set
:
Set< String > filterList = Arrays.asList( "z", "b" ).stream( ).collect( Collectors.toSet( ) );
List< String > toCheckList = Arrays.asList( "z", "b", "a", "q", "w" );
boolean contains = toCheckList.stream( ).anyMatch( list -> filterList.contains( list ) );
if ( contains ) {
System.out.println( "Contains" );
//your logic
}
Give it a thought if your filter List
can be changed to Set
on your code.