CODEWITHSUNDEEP
javafxstream
Anastasya Voloclova
Anastasya Voloclova

Reputation: 3

Java. Convert string stream to other type

I have class 

public class ListItem {
    private final String text;
    private final BooleanProperty isSelected = new SimpleBooleanProperty();

    public BooleanProperty selectedProperty() {
        return isSelected ;
    }

    public final boolean isSelected() {
        return selectedProperty().get();
    }

    public final void setSelected(boolean isSelected) {
        selectedProperty().set(isSelected);
    }

    public ListItem(String text) {
        this.text = text ;
    }

    public String getText() {
        return text;
    }

    @Override
    public String toString() {
        return getText(); 
    }
}

in other class I have this 

private ObservableList<ListItem> ListData = FXCollections.observableArrayList();

some where in code i do this:

Stream<String> stream = Files.lines(Paths.get(FILENAME), Charset.forName("windows-1251") );     
ListData = stream
  .filter(line -> line.startsWith("File"))
  .map(line -> line.substring(line.indexOf("=") + 1, line.length()))
  .collect(Collectors.toCollection(????));

What I must write in ???? position for convert string stream values to ListItem values? This convertion is possible?

Upvotes: 0

Views: 231

Answers (2)

fabian
fabian

Reputation: 82461

Since you've already created the ObservableList, you could simply use forEach to add every item to ListData. Furthermore you need to use the constructor of ListItem to wrap every element of the stream in a ListItem:

stream
      .filter(line -> line.startsWith("File"))
      .map(line -> line.substring(line.indexOf("=") + 1)) // there's also a version of substring that only takes the start index
      .map(ListItem::new) // equivalent to .map(line -> new ListItem(line))
      .forEach(ListData::add);

In case the list may not be empty this needs to be preceeded by ListData.clear();.

Upvotes: 1

tgdavies
tgdavies

Reputation: 11411

The collectionFactory parameter of Collectors.toCollection() creates a Collection, which then has add() called on it for each member of the stream.

You need to convert the Strings in your stream to ListItems -- use another map for this, then you can just use Collectors.toList().

Upvotes: 0

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