Sub binding property - more easy way?

Look at the code below. It binds to the titleProperty contained in an item stored in an < element > ObjectProperty.

import javafx.application.Application;
import javafx.beans.binding.Bindings;
import javafx.beans.binding.StringBinding;
import javafx.beans.property.ObjectProperty;
import javafx.beans.property.SimpleObjectProperty;
import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;
import javafx.stage.Stage;

public class BindingsTest extends Application {
  public static void main(String[] args) {
    launch(args);
  }

  @Override
  public void start(Stage primaryStage) {
    final ObjectProperty<Item> itemProperty = new SimpleObjectProperty<>();
    Item item = new Item();

    item.titleProperty().set("Title");

    StringBinding selectString = Bindings.selectString(itemProperty, "title");

    StringBinding title2 = new StringBinding() {
      {
        bind(itemProperty);
        if(itemProperty.get() != null) {
          bind(itemProperty.get().titleProperty());
        }
      }

      @Override
      protected void onInvalidating() {
        unbind(getDependencies());
        bind(itemProperty);
        if(itemProperty.get() != null) {
          bind(itemProperty.get().titleProperty());
        }
      }

      @Override
      protected String computeValue() {
        Item item2 = itemProperty.get();
        return item2 != null ? item2.getTitle().toUpperCase() : "(null)";
      }
    };

    System.out.println("Title = " + selectString.get() + "; uppercase title = " + title2.get());

    itemProperty.set(item);

    System.out.println("Title = " + selectString.get() + "; uppercase title = " + title2.get());

    item.titleProperty().set("New Title");

    System.out.println("Title = " + selectString.get() + "; uppercase title = " + title2.get());
  }

  public class Item {
    private final StringProperty title = new SimpleStringProperty();
    public String getTitle() { return title.get(); }
    public StringProperty titleProperty() { return title; }
  }
}

The code prints:

Title = null; uppercase title = (null)
Title = Title; uppercase title = TITLE
Title = New Title; uppercase title = NEW TITLE

The constructor of the binding and the onInvalidating() part seems very convuluted. Initially I just put this in the anonymous constructor of StringBinding:

  bind(Bindings.selectString(itemProperty, "title"));

Unfortunately, this doesn't seem to work. It will result in:

Title = null; uppercase title = (null)
Title = Title; uppercase title = TITLE
Title = New Title; uppercase title = TITLE

The idea here is to listen to the changes in the titleProperty... everywhere where itemProperty points to at the time. It works when linking directly, but apparently it does not work as a dependency of StringBinding.

The best solutions?

Published by: john16384 on February 14, 2012 21:56

itemProperty().addListener(new ChangeListener() {
  public void change(ObservableValue observableValue, Item oldValue, Item newValue) {
    if (oldValue != null) {
      uninstallItem(oldValue);
    }
    if (newValue != null) {
      installItem(newValue);
    }
  }
});

private void uninstallItem(Item oldValue) {
  titleProperty().unbind();
}

private void installItem(Item newValue) {
  titleProperty().bind(newValue.itemProperty());
}

Published by: boumedienne on February 16, 2012 12:31

Tags: Java

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Good morning (afternoon to you, BluShadow).

I got following exact, as you wish, output (derived from the EMP table):

D10     D20     D30     PREZ    MGRS    ANALS   SALESM  CLERKS
------- ------- ------- ------- ------- ------- ------- -------
CLARK   JONES   WARD    KING    BLAKE   FORD    ALLEN   ADAMS
KING    FORD    TURNER          CLARK   SCOTT   MARTIN  JAMES
MILLER  ADAMS   ALLEN           JONES           TURNER  MILLER
        SMITH   JAMES                           WARD    SMITH
        SCOTT   BLAKE
                MARTIN

by using the following query:

 with
   --
   -- pivoted departments  (haven't studied the Oracle PIVOT clause yet)
   --
   depts as
   (
    select max(case deptno
                 when 10 then ename
               end)                                 as d10,
           max(case deptno
                 when 20 then ename
               end)                                 as d20,
           max(case deptno
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               end)                                 as d30,
           rnd
      from (
            select deptno,
                   ename,
                   row_number() over (partition by deptno
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           )
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     order by rnd
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   jobs as
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               end)                                 as Clerks,
           max(case job
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               end)                                 as Prez,
           max(case job
                 when 'MANAGER'       then ename
               end)                                 as Mgrs,
           max(case job
                 when 'ANALYST'       then ename
               end)                                 as Anals,
           max(case job
                 when 'SALESMAN'      then ename
               end)                                 as SalesM,
           rnj
      from (
            select job,
                   ename,
                   row_number() over (partition by job
                                          order by ename)   as rnj
              from emp
           )
     group by rnj
     order by rnj
   )
select d10,
       d20,
       d30,
       Prez,
       Mgrs,
       Anals,
       SalesM,
       Clerks
  from depts a full outer join jobs b
                            on a.rnd = b.rnj
 order by rnj, rnd;

that takes a total of 5 selects to get there.

I tried to find a query that would be, I hope more simple, easier and does not require as much selects. My last attempt is the following (which is closer to the desired result, but does not get a cigar yet):

select case deptno
         when 10 then ename
       end                                 as d10,
       case deptno
         when 20 then ename
       end                                 as d20,
       case deptno
         when 30 then ename
       end                                 as d30,
       case job
         when 'CLERK'         then ename
       end                                 as Clerks,
       case job
         when 'PRESIDENT'     then ename
       end                                 as Prez,
       case job
         when 'MANAGER'       then ename
       end                                 as Mgrs,
       case job
         when 'ANALYST'       then ename
       end                                 as Anals,
       case job
         when 'SALESMAN'      then ename
       end                                 as SalesM,
       row_number() over (partition by deptno
                              order by deptno)  as rnd,
       row_number() over (partition by job
                              order by ename)   as rnj
  from emp
 order by rnj;

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D10     D20     D30     CLERKS  PREZ    MGRS    ANALS   SALESM   RND  RNJ
------- ------- ------- ------- ------- ------- ------- ------- ---- ----
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        ADAMS           ADAMS                                      2    1
                BLAKE                   BLAKE                      6    1
KING                            KING                               2    1
        FORD                                    FORD               1    1
        SCOTT                                   SCOTT              5    2
                JAMES   JAMES                                      5    2
CLARK                                   CLARK                      3    2
                MARTIN                                  MARTIN     2    2
                TURNER                                  TURNER     1    3
MILLER                  MILLER                                     1    3

D10     D20     D30     CLERKS  PREZ    MGRS    ANALS   SALESM   RND  RNJ
------- ------- ------- ------- ------- ------- ------- ------- ---- ----
        JONES                           JONES                      3    3
                WARD                                    WARD       4    4
        SMITH           SMITH                                      4    4

It uses a single SELECT statement and contains all the data that should be displayed, but I can't find a way to eliminate NULL values without losing a few jobs or departments

Your help is welcome and appreciated,

John.

PS: I'll be perfectly happy to learn that there is no way more easy/simple. In other words, if the answer is simply "No, there no simpler or easier way", please let me know which is the case. (I ask that you be sure enough of that though, thank you)

Published by: 440bx - 11 GR 2 on July 25, 2010 07:19 - added PS.

According to the hoek' suggestion ;-)

SQL> select d10, d20, d30, prez, mgrs, anals, salesm, clerks
  2    from (select row_number() over(partition by deptno order by ename) rn,
  3                 ename,
  4                 to_char(deptno) deptno
  5            from emp
  6          union all
  7          select row_number() over(partition by job order by ename),
  8                 ename,
  9                 job
 10            from emp) pivot(max(ename) for deptno in(10  d10,
 11                                                     20  d20,
 12                                                     30  d30,
 13                                                     'ANALYST'  anals,
 14                                                     'CLERK'  clerks,
 15                                                     'MANAGER'  mgrs,
 16                                                     'PRESIDENT'  prez,
 17                                                     'SALESMAN'  salesm))
 18   order by rn
 19  /

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---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
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MILLER     JONES      JAMES                 JONES                 TURNER     MILLER
           SCOTT      MARTIN                                      WARD       SMITH
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Best regards

Maxim

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