Nabble - GlazedLists - User

Re: re: GlazedLists, JTable and sorting

2009-11-26T01:08:36Z

thanks, work out great!

Re: Formatting of list values using AutoCompleteSupport and combo boxes in tables

2009-11-25T18:35:51Z

On 2009-11-26 01.25, James Lemieux wrote:
> Oops,
>
> It looks like there's not a form of createTableCellEditor that takes a
> Format object. That's probably an oversite on our part. As a stop-gap
> for now, you could copy a bit of code out of createTableCellEditor
> (there's not much) and roll it yourself, calling the 4arg install
> method.

Well, I tried that, but it doesn't work since the TableCellComboBox
class (and friends) are private static to AutoCompleteSupport.

For now I have changed to using strings in my combo-model, and then
resolve them back to objects when selected. Works, but is a bit hackish.
The fix with a provided Format seems like the right thing to do.

/Rickard

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Re: Formatting of list values using AutoCompleteSupport and combo boxes in tables

2009-11-25T09:25:03Z

Oops,

It looks like there's not a form of createTableCellEditor that takes a
Format object. That's probably an oversite on our part. As a stop-gap
for now, you could copy a bit of code out of createTableCellEditor
(there's not much) and roll it yourself, calling the 4arg install
method.

Sorry for the knee-jerk response earlier.

James

On 11/25/09, James Lemieux <jplemieux@...> wrote:

> Rickard,
>
> You should use this form of AutoCompleteSupport.install, which allows
> you to specify a Format object for converting back and forth between
> Strings:
>
> http://publicobject.com/glazedlists/glazedlists-1.7.0/api/ca/odell/glazedlists/swing/AutoCompleteSupport.html#install%28javax.swing.JComboBox,%20ca.odell.glazedlists.EventList,%20ca.odell.glazedlists.TextFilterator,%20java.text.Format%29
>
> James
>
> On 11/25/09, Rickard Öberg <rickardoberg@...> wrote:
>> Hi,
>>
>> I'm trying out the AutoCompleteSupport for combo boxes in JTables.
>> Basically, I want a combo box with auto-complete that will select values
>> from a given list, and when selected the value should be set in the
>> table model. The only gotcha is that the value is not a string, and so I
>> need to provide a converter between my object in the EventList for the
>> combobox and the auto-complete handling.
>>
>> There's lots of methods that do similar things in GlazedLists, but I
>> haven't been able to find any for this particular case. I create my
>> combobox like so:
>> AutoCompleteSupport.AutoCompleteCellEditor editor =
>> AutoCompleteSupport.createTableCellEditor(new Comparator()
>> {
>> public int compare( Object o1, Object o2 )
>> {
>> ListItemValue l1 = (ListItemValue) o1;
>> ListItemValue l2 = (ListItemValue) o2;
>>
>> String s1 = l1.description().get();
>> String s2 = l2.description().get();
>>
>> return s1.compareTo( s2 );
>> }
>> }, new TableFormat<ListItemValue>()
>> {
>> public int getColumnCount()
>> {
>> return 1;
>> }
>>
>> public String getColumnName( int i )
>> {
>> return "";
>> }
>>
>> public Object getColumnValue( ListItemValue listItemValue, int i )
>> {
>> return listItemValue;
>> }
>> }, list, 0);
>> editor.getAutoCompleteSupport().setStrict( true );
>> ---
>> Where "list" is my custom list of ListItemValues. I can then set a
>> custom renderer to handle them in the listing:
>> JComboBox combo = (JComboBox) editor.getComponent();
>> combo.setRenderer( new ListItemListCellRenderer() );
>> ---
>> But this code has great difficulty in converting between string and my
>> own class, so I get ClassCasts all over the place.
>>
>> What I'm missing is a way to create an auto-complete combobox for use as
>> table cell editor where I can supply my own Format. If I understand the
>> API correct that would have fixed it. But there's no way for me to
>> supply it!
>>
>> There seems to have been so much thought going into the conversion
>> between string and value in non-table cases that I hope I'm just missing
>> something. What is it?
>>
>> /Rickard
>>
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>> To unsubscribe, e-mail: users-unsubscribe@...
>> For additional commands, e-mail: users-help@...
>>
>>
>

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Re: Formatting of list values using AutoCompleteSupport and combo boxes in tables

2009-11-25T09:22:24Z

Rickard,

You should use this form of AutoCompleteSupport.install, which allows
you to specify a Format object for converting back and forth between
Strings:

http://publicobject.com/glazedlists/glazedlists-1.7.0/api/ca/odell/glazedlists/swing/AutoCompleteSupport.html#install%28javax.swing.JComboBox,%20ca.odell.glazedlists.EventList,%20ca.odell.glazedlists.TextFilterator,%20java.text.Format%29

James

On 11/25/09, Rickard Öberg <rickardoberg@...> wrote:

> Hi,
>
> I'm trying out the AutoCompleteSupport for combo boxes in JTables.
> Basically, I want a combo box with auto-complete that will select values
> from a given list, and when selected the value should be set in the
> table model. The only gotcha is that the value is not a string, and so I
> need to provide a converter between my object in the EventList for the
> combobox and the auto-complete handling.
>
> There's lots of methods that do similar things in GlazedLists, but I
> haven't been able to find any for this particular case. I create my
> combobox like so:
> AutoCompleteSupport.AutoCompleteCellEditor editor =
> AutoCompleteSupport.createTableCellEditor(new Comparator()
> {
> public int compare( Object o1, Object o2 )
> {
> ListItemValue l1 = (ListItemValue) o1;
> ListItemValue l2 = (ListItemValue) o2;
>
> String s1 = l1.description().get();
> String s2 = l2.description().get();
>
> return s1.compareTo( s2 );
> }
> }, new TableFormat<ListItemValue>()
> {
> public int getColumnCount()
> {
> return 1;
> }
>
> public String getColumnName( int i )
> {
> return "";
> }
>
> public Object getColumnValue( ListItemValue listItemValue, int i )
> {
> return listItemValue;
> }
> }, list, 0);
> editor.getAutoCompleteSupport().setStrict( true );
> ---
> Where "list" is my custom list of ListItemValues. I can then set a
> custom renderer to handle them in the listing:
> JComboBox combo = (JComboBox) editor.getComponent();
> combo.setRenderer( new ListItemListCellRenderer() );
> ---
> But this code has great difficulty in converting between string and my
> own class, so I get ClassCasts all over the place.
>
> What I'm missing is a way to create an auto-complete combobox for use as
> table cell editor where I can supply my own Format. If I understand the
> API correct that would have fixed it. But there's no way for me to
> supply it!
>
> There seems to have been so much thought going into the conversion
> between string and value in non-table cases that I hope I'm just missing
> something. What is it?
>
> /Rickard
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@...
> For additional commands, e-mail: users-help@...
>
>

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Formatting of list values using AutoCompleteSupport and combo boxes in tables

2009-11-25T03:47:06Z

Hi,

I'm trying out the AutoCompleteSupport for combo boxes in JTables.
Basically, I want a combo box with auto-complete that will select values
from a given list, and when selected the value should be set in the
table model. The only gotcha is that the value is not a string, and so I
need to provide a converter between my object in the EventList for the
combobox and the auto-complete handling.

There's lots of methods that do similar things in GlazedLists, but I
haven't been able to find any for this particular case. I create my
combobox like so:
AutoCompleteSupport.AutoCompleteCellEditor editor =
AutoCompleteSupport.createTableCellEditor(new Comparator()
{
public int compare( Object o1, Object o2 )
{
ListItemValue l1 = (ListItemValue) o1;
ListItemValue l2 = (ListItemValue) o2;

String s1 = l1.description().get();
String s2 = l2.description().get();

return s1.compareTo( s2 );
}
}, new TableFormat<ListItemValue>()
{
public int getColumnCount()
{
return 1;
}

public String getColumnName( int i )
{
return "";
}

public Object getColumnValue( ListItemValue listItemValue, int i )
{
return listItemValue;
}
}, list, 0);
editor.getAutoCompleteSupport().setStrict( true );
---
Where "list" is my custom list of ListItemValues. I can then set a
custom renderer to handle them in the listing:
JComboBox combo = (JComboBox) editor.getComponent();
combo.setRenderer( new ListItemListCellRenderer() );
---
But this code has great difficulty in converting between string and my
own class, so I get ClassCasts all over the place.

What I'm missing is a way to create an auto-complete combobox for use as
table cell editor where I can supply my own Format. If I understand the
API correct that would have fixed it. But there's no way for me to
supply it!

There seems to have been so much thought going into the conversion
between string and value in non-table cases that I hope I'm just missing
something. What is it?

/Rickard

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SWT/JFace TableViewer with GlazedLists

2009-11-24T09:35:16Z

As seen in this example http://hexapixel.com/2009/01/02/glazed-lists-swt-tables-true you can use GL with JFace Viewers. I wonder if that is an efficient way to use GL? I would like to facilitate the JFace Viewers in my project too, as they are easily extensible with custom drawing and column formatters (especially inside the Eclipse RCP Framework). Any thoughts on that?

I think it might not perform so well speed and memory wise, as the GL filtering would need the viewer to update its internal item state.

Force re-sort of TableComparatorChooser

2009-11-21T08:39:59Z

Hi,

I have a SWT-Table which displays me data and I sort it by installing a TableComparatorChooser.
I have viewoptions which changes the way data in the Table is displayed by setting a new TableFormat on the EventTableViewer (I implemented that). TableComparatorChooser still sorts based on the old TableFormat, so I made the protected method "setTableFormat" in AbstractTableComparatorChooser public and called it.
The problem left is, that my columns don't change normally and I want to set the sortingcolumn to the old column. I tried table.setSortColumn but that doesn't work. Has the chooser some ability to set a column?

Re: EventTableModel.getRowCount always returns 0

2009-11-20T13:51:24Z

On Thu, 19 Nov 2009 08:57:50 -0800 (PST) newmanw <newmanw10@...> wrote:

n> I want to display the number of rows in my table but no matter how many rows
n> I have in the table the call to getRowCount always returns 0. Am I doing
n> something wrong or is this a bug?

You're doing something wrong, I think. Can you show a minimal example
with source code?

Ted

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EventTableModel default sort order

2009-11-19T12:42:52Z

Just noticed an interesting behavior:

I have a sorted list with a default ordering, attached to a TableComparitorChooser. The comparator for the list constructor does natural ordering on the member in the list element that is displayed in column 0.

I'm using AdvancedTableFormat, and the comparator that I return for column 0 perfroms natural ordering.

The table comparitor chooser is installed with MULTIPLE_COLUMN_MOUSE_WITH_UNDO

I bring up the table, and the list is ordered using natural ordering.

I click on column 0 heading, and the list orders natural ordering ascending

I click on column 0 again, and the list orders natural ordering descending

I click on column 0 again, and the list becomes unsorted

So it looks like my default ordering isn't being preserved, and I'm not seeing a way to enforce it (I suppose that I could put another sorted list in the pipeline that forces the default sort, but that seems unreasonable).

Digging into the source, it seems like the issue is in AbstractTableComparatorChooser here:

    /**
     * Updates the comparator in use and applies it to the table.
     */
    protected void rebuildComparator() {
        final Comparator<E> rebuiltComparator = sortingState.buildComparator();

        // select the new comparator
        sortedList.getReadWriteLock().writeLock().lock();
        try {
            sortedListComparator = rebuiltComparator;
            sortedList.setComparator(rebuiltComparator);
        } finally {
            sortedList.getReadWriteLock().writeLock().unlock();
        }
    }

There should be:

1. Caching of the original comparator on the list

2. A check for if rebuiltComparator == null that sets the original list comparator

If this sounds good, I'll put together a patch that does the above - please let me know.

Cheers,

- K

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EventTableModel.getRowCount always returns 0

2009-11-19T08:57:48Z

I want to display the number of rows in my table but no matter how many rows I have in the table the call to getRowCount always returns 0. Am I doing something wrong or is this a bug?

re: BasicEventList's ListEvent has no information

2009-11-12T05:43:17Z

Not sure if you are still having issues here or not.

It's possible that the ListEvent is only a valid object in the context of the event itself. If you do your tests inside the listChanged() method, do they still fail?

- K

----------------------- Original Message -----------------------

From: reibans esticbo@...

To: users@...

Cc:

Date: Tue, 3 Nov 2009 09:37:19 -0800 (PST)

Subject: BasicEventList's ListEvent has no information

I want to use glazedlists-1.8.0_java15 in my project and I wrote a little
unit test beforehand to play with the API and get to know how it works. In
the test, I'm using a BasicEventList and I register a mock listener. When I
add one element to the list, the listener is called but the resulting
ListEvent has no info. The test is failing in the first assert because
ListEvent.next() method is returning false. Could somebody tell me what I'm
doing wrong? Here is the test code:

package checklist;

import ca.odell.glazedlists.BasicEventList;
import ca.odell.glazedlists.EventList;
import ca.odell.glazedlists.event.ListEvent;
import ca.odell.glazedlists.event.ListEventListener;
import org.junit.Test;
import static org.junit.Assert.*;

public class BasicEventListTest {

   @Test
   public void addElement() {
       EventList<String> eventList = new BasicEventList<String>();
       MockListEventListener<String> listener = new
MockListEventListener<String>();
       eventList.addListEventListener(listener);

       eventList.add("hello");
       assertEquals(1, listener.callCount);
       assertTrue("true expected", listener.event.next());
       assertEquals(ListEvent.INSERT, listener.event.getType());
       assertEquals(0, listener.event.getIndex());
   }

   private static class MockListEventListener<E> implements
ListEventListener<E> {
       int callCount;
       ListEvent<E> event;

       public void listChanged(ListEvent<E> listChanges) {
           callCount++;
           event = listChanges;
       }
   }
}

Many thanks,
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re: GlazedLists, JTable and sorting

2009-11-12T05:10:19Z

Create a FunctionList that transforms the File object into an object with the fields you wish to have. Then build your table format around this intermediate object. This effectively caches your transform so downstream operations (filtering, sorting, etc...) won't result in re-calculation.

- K

----------------------- Original Message -----------------------

From: Endors endors84@...

To: users@...

Cc:

Date: Thu, 12 Nov 2009 03:17:10 -0800 (PST)

Subject: GlazedLists, JTable and sorting

Hello,

I have currently implemented glazed lists to use with JTable. It works
pretty good except for the sorting of columns. The problem is that i use the
java File object and my tableformat returns different variables from this
object. I have observed that when im sorting the table with GL the method
getColumnValue will run again for each element in the EventList. 2 of my
values getColumnValue returns take som time to process. Is it possible to
only sort on the current data in the JTable?

Some sample code:

@Override
   public Object getColumnValue(Object baseObject, int column) {
       File file = (File) baseObject;

       switch (column) {
           case 0:
               return file.getName();
           case 1:
               String date = FileTools.getLastModifiedDate(file);
               return date;
           case 2:
               String extension = !file.isDirectory() ?
FilenameUtils.getExtension(file.getName()) : "Folder";
               return extension;
           case 3:
               return FileTools.getFileSize(file.length(), fileSizeUnit);
           case 4:
               return file.getAbsolutePath();
           default:
               return null;
       }
   }

Thanks in advance!
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GlazedLists, JTable and sorting

2009-11-12T03:17:09Z

BasicEventList's ListEvent has no information

2009-11-03T09:37:19Z

I want to use glazedlists-1.8.0_java15 in my project and I wrote a little
unit test beforehand to play with the API and get to know how it works. In
the test, I'm using a BasicEventList and I register a mock listener. When I
add one element to the list, the listener is called but the resulting
ListEvent has no info. The test is failing in the first assert because
ListEvent.next() method is returning false. Could somebody tell me what I'm
doing wrong? Here is the test code:

package checklist;

import ca.odell.glazedlists.BasicEventList;
import ca.odell.glazedlists.EventList;
import ca.odell.glazedlists.event.ListEvent;
import ca.odell.glazedlists.event.ListEventListener;
import org.junit.Test;
import static org.junit.Assert.*;

public class BasicEventListTest {

@Test
public void addElement() {
EventList<String> eventList = new BasicEventList<String>();
MockListEventListener<String> listener = new
MockListEventListener<String>();
eventList.addListEventListener(listener);

eventList.add("hello");
assertEquals(1, listener.callCount);
assertTrue("true expected", listener.event.next());
assertEquals(ListEvent.INSERT, listener.event.getType());
assertEquals(0, listener.event.getIndex());
}

private static class MockListEventListener<E> implements
ListEventListener<E> {
int callCount;
ListEvent<E> event;

public void listChanged(ListEvent<E> listChanges) {
callCount++;
event = listChanges;
}
}
}

Many thanks,
--
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BasicEventList's ListEvent has no information

2009-11-03T09:36:30Z

I want to use glazedlists-1.8.0_java15 in my project and I wrote a little
unit test beforehand to play with the API and get to know how it works. In
the test, I'm using a BasicEventList and I register a mock listener. When I
add one element to the list, the listener is called but the resulting
ListEvent has no info. The test is failing in the first assert because
ListEvent.next() method is returning false. Could somebody tell me what I'm
doing wrong? Here is the test code:

package checklist;

import ca.odell.glazedlists.BasicEventList;
import ca.odell.glazedlists.EventList;
import ca.odell.glazedlists.event.ListEvent;
import ca.odell.glazedlists.event.ListEventListener;
import org.junit.Test;
import static org.junit.Assert.*;

public class BasicEventListTest {

@Test
public void addElement() {
EventList<String> eventList = new BasicEventList<String>();
MockListEventListener<String> listener = new
MockListEventListener<String>();
eventList.addListEventListener(listener);

eventList.add("hello");
assertEquals(1, listener.callCount);
assertTrue("true expected", listener.event.next());
assertEquals(ListEvent.INSERT, listener.event.getType());
assertEquals(0, listener.event.getIndex());
}

private static class MockListEventListener<E> implements
ListEventListener<E> {
int callCount;
ListEvent<E> event;

public void listChanged(ListEvent<E> listChanges) {
callCount++;
event = listChanges;
}
}
}

Many thanks,
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Re: Request for an SWT Glazedlists "gentil" tutorial

2009-11-03T07:44:07Z

Hi,
Thanks a lot for your valuable help.
I'm really happy to find this source code because it's useful for my work.
All my best regards and good luck.
God bless.

Ok, here's a running example.

http://github.com/fab1an/gl-addons/blob/master/src/at/busta/glazedlists/test/swt/EventTableViewerDemo.java

you can checkout the whole repo or just this file to build it.

It shows:
* population of Table via a background thread
* locking which is needed in this case
* "filtering via Buttons"
* filtering by a Text-input
* sorting of the table
* selection

HTH
fabian

Hi,
Thank you for the replay, but the example is still incomplete (for me as a beginner in the GlazedList API).
All that I need is a clear snippet where an SWT table is created and populated and then the sort and filter feature is added.
Thanks in advance and good luck.

fab|an wrote:

Hi,

here's something I quickly copy'n'pasted together: http://gist.github.com/224365

HTH
fabian

Oceanys wrote:

Hi, I'm new to the good GlazedLists API and I'm using SWT tables.

I was happy when I found the GlazedLists API. I have a problem with SWT GlazedLists integration because the majority of the available tutorials are written for Swing or for other SWT widgets (I mean the pixel example in the link
http://hexapixel.com/2009/01/02/glazed-lists-swt-tables-true).

Is anyone have a simple source code or snippet to start with a simple SWT table and Glazed lists in order to show how we can sort and filter it.
Thanks in advance and cordially.

Re: Request for an SWT Glazedlists "gentil" tutorial

2009-11-03T07:41:49Z

fab|an wrote:

Hi,

here's something I quickly copy'n'pasted together: http://gist.github.com/224365

HTH
fabian

Oceanys wrote:

Hi, I'm new to the good GlazedLists API and I'm using SWT tables.

I was happy when I found the GlazedLists API. I have a problem with SWT GlazedLists integration because the majority of the available tutorials are written for Swing or for other SWT widgets (I mean the pixel example in the link
http://hexapixel.com/2009/01/02/glazed-lists-swt-tables-true).

Is anyone have a simple source code or snippet to start with a simple SWT table and Glazed lists in order to show how we can sort and filter it.
Thanks in advance and cordially.

Re: Request for an SWT Glazedlists "gentil" tutorial

2009-11-03T06:13:37Z

Ok, here's a running example.

http://github.com/fab1an/gl-addons/blob/master/src/at/busta/glazedlists/test/swt/EventTableViewerDemo.java

you can checkout the whole repo or just this file to build it.

It shows:
* population of Table via a background thread
* locking which is needed in this case
* "filtering via Buttons"
* filtering by a Text-input
* sorting of the table
* selection

HTH
fabian

Hi,
Thank you for the replay, but the example is still incomplete (for me as a beginner in the GlazedList API).
All that I need is a clear snippet where an SWT table is created and populated and then the sort and filter feature is added.
Thanks in advance and good luck.

fab|an wrote:

Hi,

here's something I quickly copy'n'pasted together: http://gist.github.com/224365

HTH
fabian

Oceanys wrote:

Hi, I'm new to the good GlazedLists API and I'm using SWT tables.

I was happy when I found the GlazedLists API. I have a problem with SWT GlazedLists integration because the majority of the available tutorials are written for Swing or for other SWT widgets (I mean the pixel example in the link
http://hexapixel.com/2009/01/02/glazed-lists-swt-tables-true).

Is anyone have a simple source code or snippet to start with a simple SWT table and Glazed lists in order to show how we can sort and filter it.
Thanks in advance and cordially.

Re: Request for an SWT Glazedlists "gentil" tutorial

2009-11-03T00:13:37Z

Hi,
Thank you for the replay, but the example is still incomplete (for me as a beginner in the GlazedList API).
All that I need is a clear snippet where an SWT table is created and populated and then the sort and filter feature is added.
Thanks in advance and good luck.

Hi,

here's something I quickly copy'n'pasted together: http://gist.github.com/224365

HTH
fabian

Oceanys wrote:

Hi, I'm new to the good GlazedLists API and I'm using SWT tables.

I was happy when I found the GlazedLists API. I have a problem with SWT GlazedLists integration because the majority of the available tutorials are written for Swing or for other SWT widgets (I mean the pixel example in the link
http://hexapixel.com/2009/01/02/glazed-lists-swt-tables-true).

Is anyone have a simple source code or snippet to start with a simple SWT table and Glazed lists in order to show how we can sort and filter it.
Thanks in advance and cordially.

Re: Request for an SWT Glazedlists "gentil" tutorial

2009-11-03T00:08:03Z

Oceanys wrote:

Hi, I'm new to the good GlazedLists API and I'm using SWT tables.

I was happy when I found the GlazedLists API. I have a problem with SWT GlazedLists integration because the majority of the available tutorials are written for Swing or for other SWT widgets (I mean the pixel example in the link
http://hexapixel.com/2009/01/02/glazed-lists-swt-tables-true).

Is anyone have a simple source code or snippet to start with a simple SWT table and Glazed lists in order to show how we can sort and filter it.
Thanks in advance and cordially.

Re: Request for an SWT Glazedlists "gentil" tutorial

2009-11-02T11:21:04Z

Hi,

here's something I quickly copy'n'pasted together: http://gist.github.com/224365

HTH
fabian

Oceanys wrote:

Hi, I'm new to the good GlazedLists API and I'm using SWT tables.

I was happy when I found the GlazedLists API. I have a problem with SWT GlazedLists integration because the majority of the available tutorials are written for Swing or for other SWT widgets (I mean the pixel example in the link
http://hexapixel.com/2009/01/02/glazed-lists-swt-tables-true).

Is anyone have a simple source code or snippet to start with a simple SWT table and Glazed lists in order to show how we can sort and filter it.
Thanks in advance and cordially.

Request for an SWT Glazedlists "gentil" tutorial

2009-11-02T10:54:33Z

Hi, I'm new to the good GlazedLists API and I'm using SWT tables.

I was happy when I found the GlazedLists API. I have a problem with SWT GlazedLists integration because the majority of the available tutorials are written for Swing or for other SWT widgets (I mean the pixel example in the link
http://hexapixel.com/2009/01/02/glazed-lists-swt-tables-true).

Is anyone have a simple source code or snippet to start with a simple SWT table and Glazed lists in order to show how we can sort and filter it.
Thanks in advance and cordially.

GoogleWave invitation

2009-10-30T11:19:27Z

Hi,

sorry if you consider this mail spam, but has anyone access to GW yet? I'm interested but didn't get an invitation.

fabian

re[3]: SequenceList

2009-10-18T20:46:43Z

The use case here is fairly common (we do something similar frequently) - but I think the suggested solution is sufficient for the bulk of cases. It would be *much* more useful to have access to the deleted element in delete events (this would allow effective caching of computed values).

- K

----------------------- Original Message -----------------------

From: cocoa cocoa@...

To: users@...

Cc:

Date: Mon, 12 Oct 2009 13:47:10 -0700 (PDT)

Subject: Re: re: SequenceList

> The SequenceList problem you mention is a legit bug in my opinion. Would
> you mind filing a bug in our bugtracker?
>

I've filed a bug, see
https://glazedlists.dev.java.net/issues/show_bug.cgi?id=482
https://glazedlists.dev.java.net/issues/show_bug.cgi?id=482 . A bug
attachment contains a failing unit test.

> As for the approach to your problem (inserting sequence placeholders into
> a list), that's something that isn't trivial to do with our existing
> transformations. If I was in your shoes, I'd consider extending
> TransformedList and implementing that transformation myself from the
> ground up. It actually shouldn't be that hard to implement, overall.
>

Implementing my own TransformedList seems daunting :S. I've had a quick look
at some TransformedList implementations. The current solution with the
CompositeList seems to work so far. As long as it works I abstain from
implementing any TransformedList ;). Unless somebody is willing to help me
get up to speed with all those internal details of glazed lists.

> We probably could dream up some type of transformation in the core that,
> given two adjacent items in the source EventList, delegated to a Sequencer
> type of object that filled in the gaps... I'm unsure of how useful that is
> to our general audience.
>

My use case is to generate a report that shows the total time (or distance)
of activities grouped by a time period (e.g. week, month, ...). Obviously,
it is possible that some period does not contain any activity. So, the
bucket is missing in the GroupingList, which is not acceptable. The missing
bucket is important information by itself (i.e. the user did not perform any
sport activity).
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TreeList help

2009-10-13T02:49:13Z

Hi to all,

I'm using TreeList with JTree.

Its seems like there is no support for ExpansionModel in JTree.

my questions are

1) Am i right?

2) What UI componet has a support for this feature? (maybe TreeTable)

thanks,

Gal.

Re: re: SequenceList

2009-10-12T13:47:08Z

The SequenceList problem you mention is a legit bug in my opinion. Would you mind filing a bug in our bugtracker?

I've filed a bug, see https://glazedlists.dev.java.net/issues/show_bug.cgi?id=482. A bug attachment contains a failing unit test.

As for the approach to your problem (inserting sequence placeholders into a list), that's something that isn't trivial to do with our existing transformations. If I was in your shoes, I'd consider extending TransformedList and implementing that transformation myself from the ground up. It actually shouldn't be that hard to implement, overall.

Implementing my own TransformedList seems daunting :S. I've had a quick look at some TransformedList implementations. The current solution with the CompositeList seems to work so far. As long as it works I abstain from implementing any TransformedList ;). Unless somebody is willing to help me get up to speed with all those internal details of glazed lists.

We probably could dream up some type of transformation in the core that, given two adjacent items in the source EventList, delegated to a Sequencer type of object that filled in the gaps... I'm unsure of how useful that is to our general audience.

My use case is to generate a report that shows the total time (or distance) of activities grouped by a time period (e.g. week, month, ...). Obviously, it is possible that some period does not contain any activity. So, the bucket is missing in the GroupingList, which is not acceptable. The missing bucket is important information by itself (i.e. the user did not perform any sport activity).

Re: re: SequenceList

2009-10-12T09:29:28Z

Simon,

The SequenceList problem you mention is a legit bug in my opinion. Would you mind filing a bug in our bugtracker?

As for the approach to your problem (inserting sequence placeholders into a list), that's something that isn't trivial to do with our existing transformations. If I was in your shoes, I'd consider extending TransformedList and implementing that transformation myself from the ground up. It actually shouldn't be that hard to implement, overall.

We probably could dream up some type of transformation in the core that, given two adjacent items in the source EventList, delegated to a Sequencer type of object that filled in the gaps... I'm unsure of how useful that is to our general audience.

Good Luck,

James

On Sun, Oct 11, 2009 at 3:02 PM, cocoa <cocoa@...> wrote:

I soon saw that my initial approach does not work. The map, as you mentioned,
is not updated so the approach is broken. Next I've tried the proposed
approach using a CompositeList.

The first list is a SequenceList that produces PlaceholderActivity objects
with a Sequencer. However, I've run into an issue with the SequenceList. It
adds the source Activity objects to the SequenceList (not the placeholder
activity objects). This results in incorrect duration totals (i.e. the first
one is twice as large as it should be). So I've added a
FunctionList<Activity, PlaceholderActivity> to the source list. That way, I
get the expected sequence lists consisting only of PlaceholderActivity.

The CompositeList stuff works as advertised. I get the missing buckets with
a 0 total duration.

Simon

PS: I'm not groking why the first value of the SequenceList is duplicated.
It does not hurt in my case, because placeholder activities are not used for
the calculations. Below is a simple snipped that shows what I mean:

EventList<Integer> src = new BasicEventList<Integer>();
src.add(1);
src.add(3);

SequenceList<Integer> integers = new SequenceList<Integer>(src, new
Sequencer<Integer>() {
public Integer next(Integer value) {
return value + 1;
}
public Integer previous(Integer value) {
return value - 1;
}
});

for (Integer value : integers) {
System.out.println(value);
}

Output is :
1
1
2
3

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Re: re: SequenceList

2009-10-11T15:01:59Z

I soon saw that my initial approach does not work. The map, as you mentioned, is not updated so the approach is broken. Next I've tried the proposed approach using a CompositeList.

The first list is a SequenceList that produces PlaceholderActivity objects with a Sequencer. However, I've run into an issue with the SequenceList. It adds the source Activity objects to the SequenceList (not the placeholder activity objects). This results in incorrect duration totals (i.e. the first one is twice as large as it should be). So I've added a FunctionList<Activity, PlaceholderActivity> to the source list. That way, I get the expected sequence lists consisting only of PlaceholderActivity.

The CompositeList stuff works as advertised. I get the missing buckets with a 0 total duration.

Simon

PS: I'm not groking why the first value of the SequenceList is duplicated. It does not hurt in my case, because placeholder activities are not used for the calculations. Below is a simple snipped that shows what I mean:

EventList<Integer> src = new BasicEventList<Integer>();
src.add(1);
src.add(3);

SequenceList<Integer> integers = new SequenceList<Integer>(src, new Sequencer<Integer>() {
public Integer next(Integer value) {
return value + 1;
}
public Integer previous(Integer value) {
return value - 1;
}
});

for (Integer value : integers) {
System.out.println(value);
}

Output is :
1
1
2
3

re: SequenceList

2009-10-10T21:08:50Z

I think you may run into some problems with this approach - the map is not a live map. Be sure to test the following scenario:

1. Initial condition is a setup that is missing data in week3

2. Add an element for week 3 - did the summary get re-constructed?

Repeat, but instead of adding an element for week 3, change an existing element so that it now resides in week 3. Same test.

There is a lot of nastiness with event publication and dependant listeners that you have to deal with when you introduce a map that is driving another list's behavior. It *can* be done, but the opportunity for error and odd little corner cases (that are really hard to debug) is very high.

Another approach to this problem that doesn't use maps would be to construct a list of dummy PlaceHolderActivity objects - these will not get added to your totals if they appear in a list that a summary operates against. Create one PlaceHolderActivity for each bucket you want to appear in the output (so if you are doing 52 weeks, you'd have 52). Now, composite this list with the source list using CompositeList, then pipe it into your grouping list.

Also, it will simplify things if you make the EventList<PlaceHolderActivity> be a SequenceList built from the source list. Cool, eh?

placeHolders = new SequenceList<Activity>(source, sequencer); // sequencer returns a sub-class of Activity - PlaceHolderActivity

composite = new CompositeList<Activity>(source.getPubliser(), source.getReadWriteLock());

composite.addMemberList(source);

composite.addMemberList(placeHolders);

grouped = new GroupingList<Activity>(composite);

// then comes a function list whose function calculates the summaries
FunctionList<List<Activity>, SummaryRecord> summaries = ...; // function ignores list entries that are PlaceHolderActivities

summaries now contains the list that you want, including the 'missing' buckets, and you don't have the messy event publisher stuff from the map to deal with.

- K

----------------------- Original Message -----------------------

From: cocoa cocoa@...

To: users@...

Cc:

Date: Sat, 10 Oct 2009 15:51:53 -0700 (PDT)

Subject: SequenceList

In my application a list of sport activities can be tracked and analyzed. I
want to provide a summary view that shows the total time or distance of all
activities within a certain time period (e.g. week) over some time (e.g. the
last year). Below is the basic list setup I use.

// list of activities
EventList<Activity> source = ...;

// observe property change events
EventList<Activity> observed = new ObservableElementList(source, ...);

// group the activities by time period, e.g. per week
GroupingList<Activity> grouped = new
GroupingList<Activity>(observedElementList, ...);

// then comes a function list whose function calculates the summaries
FunctionList<List<Activity>, SummaryRecord> summaries = ...;

As GroupingList does not return any empty groups, it happens that the
summaries contains gaps, i.e. time periods for which no group exists. Then I
stumbled upon the SequenceList, which I thought might be of some help. First
I had some problems with the sequencer implementation (the summaries after
the first element where lost). But here is with what I came up with.

// first create a map that maps a time period to the list of summaries
DisposableMap<Week, List<SummaryRecord>> map =
GlazedLists.syncEventListToMultiMap(summaries, keyMaker());

// then pass this map to the sequencer implementation
SequenceList<SummaryRecord> sequence = new
SequenceList<SummaryRecord>(summaries, new RecordSequencer(map));

The sequencer uses the map to implement next and previous so that if there
is already a SummaryRecord for a time period then that SummaryRecord is
returned (otherwise, an empty SummaryRecord). See the implementation of
next().

public Record next(SummaryRecord value) {
   Week week = value.week.next();
   List<SummaryRecord> existing = map.get(week);
   return existing != null ? existing.get(0) : new SummaryRecord(week, 0);
}

So far, this seems to work. I am just wondering whether there is a simpler
way to achieve the same thing. I'm sure others have done this kind of
reporting over a data set. There is also precious few documentation for
SequenceList, so I'm not sure that this is a supported way of using it
(especially the Sequencer implementation).

Any suggestions?
Simon

PS: SequenceList seems to have a bug if the earliest source value is a
sequence value. In that case, the earliest sequence value is duplicated in
the result list (can easily be shown with month sequencer).

PS: glazedlists is amazing :clap:
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SequenceList

2009-10-10T15:51:50Z

In my application a list of sport activities can be tracked and analyzed. I want to provide a summary view that shows the total time or distance of all activities within a certain time period (e.g. week) over some time (e.g. the last year). Below is the basic list setup I use.

// list of activities
EventList<Activity> source = ...;

// observe property change events
EventList<Activity> observed = new ObservableElementList(source, ...);

// group the activities by time period, e.g. per week
GroupingList<Activity> grouped = new GroupingList<Activity>(observedElementList, ...);

// then comes a function list whose function calculates the summaries
FunctionList<List<Activity>, SummaryRecord> summaries = ...;

As GroupingList does not return any empty groups, it happens that the summaries contains gaps, i.e. time periods for which no group exists. Then I stumbled upon the SequenceList, which I thought might be of some help. First I had some problems with the sequencer implementation (the summaries after the first element where lost). But here is with what I came up with.

// first create a map that maps a time period to the list of summaries
DisposableMap<Week, List<SummaryRecord>> map = GlazedLists.syncEventListToMultiMap(summaries, keyMaker());

// then pass this map to the sequencer implementation
SequenceList<SummaryRecord> sequence = new SequenceList<SummaryRecord>(summaries, new RecordSequencer(map));

The sequencer uses the map to implement next and previous so that if there is already a SummaryRecord for a time period then that SummaryRecord is returned (otherwise, an empty SummaryRecord). See the implementation of next().

public Record next(SummaryRecord value) {
Week week = value.week.next();
List<SummaryRecord> existing = map.get(week);
return existing != null ? existing.get(0) : new SummaryRecord(week, 0);
}

So far, this seems to work. I am just wondering whether there is a simpler way to achieve the same thing. I'm sure others have done this kind of reporting over a data set. There is also precious few documentation for SequenceList, so I'm not sure that this is a supported way of using it (especially the Sequencer implementation).

Any suggestions?
Simon

PS: SequenceList seems to have a bug if the earliest source value is a sequence value. In that case, the earliest sequence value is duplicated in the result list (can easily be shown with month sequencer).

PS: glazedlists is amazing

Re: gl-addons

2009-10-06T10:29:01Z

Forgot, the link: http://github.com/fab1an/gl-addons

fab|an wrote:

I have a nice little repository with stuff i wrote for glazedlists.
May it be of use for anyone.

EventTreeViewer
SWT Viewer for TreeList. Works for me, but lacks VIRTUAL support.
I need comments on http://www.nabble.com/2-TreeList-bugs--td24557579.html though...

Set/ClassSetMatcherEditor
MatcherEditor which tests an (function-)extracted enum property against a set of provided enums. I found that I could generalize much filter-scenarios this way.

Bug in ThresholdMatcherEditor

2009-10-05T14:44:18Z

Hi all

ThresholdMatcherEditor extends from AbstractMatcherEditor.
Both the classes have a variable named 'currentMatcher'.

ThresholdMatcherEditor sets its private variable 'currentMatcher' which is not propagated to super.
Also it does not override the getMatcher() method, hence the variable from AbstractMatcherEditor gets picked up. This is incorrect.

Small but caused my CompositeMatcher to behave erratically.

Baljeet

gl-addons

2009-10-05T12:35:20Z

I have a nice little repository with stuff i wrote for glazedlists.
May it be of use for anyone.

EventTreeViewer
SWT Viewer for TreeList. Works for me, but lacks VIRTUAL support.
I need comments on http://www.nabble.com/2-TreeList-bugs--td24557579.html though...

Set/ClassSetMatcherEditor
MatcherEditor which tests an (function-)extracted enum property against a set of provided enums. I found that I could generalize much filter-scenarios this way.

Re: Updates off the Swing EDT

2009-09-28T09:37:29Z

Richard,

   Your 3 points are all spot-on. If you can achieve immutability with your elements, I think that produces the sexiest result, but of course you'll need to consider code already written.

   One note of caution: ThreadSafeList is fine for single-method interactions with an EventList, but keep in mind that you must still manually lock and unlock the list for larger units of atomicity. For example:

Object firstElement = null;
if (!myEventList.isEmpty())
   firstElement = myEventList.get(0);

isn't concurrently correct, even if myEventList is a ThreadSafeList, since the lock of the list pipeline is unlocked between the calls to isEmpty() and get(). So, this should really be written as:

Object firstElement = null;
myEventList.getReadWriteLock().lock();
try {
if (!myEventList.isEmpty())
   firstElement = myEventList.get(0);
} finally {
myEventList.getReadWriteLock().unlock();
}

Keep on Glazin' in the free world,

James

On Mon, Sep 28, 2009 at 7:30 AM, Richard <numberoneskier@...> wrote:

Hi Gerrit,

thanks for your response, it does help because it made me aware of FunctionList
and confirmed my suspicion that 'something else' needs to be done.

Cloning is OK for most of my use cases, but i've got one case where i've got in
the order of 10-15 thousand items in the list and the user has multiple
views over those items... not sure if i want to clone all that multiple times!
Luckily in this case i control the entire code so i might make things immutable
so updates are really forced to be replacements which should make the race
conditions go away.

Anyway, putting aside specific cases, i'd like to confirm my general
understanding of the situation:

(1) if you have a mutable list (insertions/deletions) then wrapping it in
ThreadSafeList and using EventTableModel is enough to satisfy Swings EDT rules
even if the mutations to the list are happening OFF the EDT.

(2) if you have mutable items in the list and the items are being mutated ON
the EDT then you can contain them in an ObservableElementList, wrap that in a
ThreadSafeList and use EventTableModel, you will be safe (allows the list to be
changed off EDT, but items must be changed on EDT).

(3) if you have mutable items in the list and the items are being mutated OFF
the EDT then this will cause race conditions in JTable painting unless you do
'something else', such as cloning, or... actually i can't think of anything
else!?!

Would that be a fair synopsis?

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Re: Updates off the Swing EDT

2009-09-28T07:30:01Z

Hi Gerrit,

thanks for your response, it does help because it made me aware of FunctionList
and confirmed my suspicion that 'something else' needs to be done.

Cloning is OK for most of my use cases, but i've got one case where i've got in
the order of 10-15 thousand items in the list and the user has multiple
views over those items... not sure if i want to clone all that multiple times!
Luckily in this case i control the entire code so i might make things immutable
so updates are really forced to be replacements which should make the race
conditions go away.

Anyway, putting aside specific cases, i'd like to confirm my general
understanding of the situation:

(1) if you have a mutable list (insertions/deletions) then wrapping it in
ThreadSafeList and using EventTableModel is enough to satisfy Swings EDT rules
even if the mutations to the list are happening OFF the EDT.

(2) if you have mutable items in the list and the items are being mutated ON
the EDT then you can contain them in an ObservableElementList, wrap that in a
ThreadSafeList and use EventTableModel, you will be safe (allows the list to be
changed off EDT, but items must be changed on EDT).

(3) if you have mutable items in the list and the items are being mutated OFF
the EDT then this will cause race conditions in JTable painting unless you do
'something else', such as cloning, or... actually i can't think of anything
else!?!

Would that be a fair synopsis?

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