How to setItems in vaadin grid when items are in a map

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I am trying to load use this query and the values into a map

LinkedHashMap<SCRegionPriority, String> hash = new LinkedHashMap<>();

pstmt=("SELECT a.Id,a.RegionName,ISNULL(b.Priority,0) as priority 

      FROM dbo.region a left join dbo.SCMap b on a.Id = b.RegionId 

      and a.CountryId = b.CountryId and b.SCId=1 where a.CountryId ='1'")

ResultSet rs = pstmt.executeQuery();

con.commit();

    while (rs.next()) {

            SCPri c = new SCPri();

            c.setRegionid(rs.getInt(1));

            c.setRegionname(rs.getString(2));

            c.setPriority(rs.getInt(3));

            hash.put(c, String.valueOf(rs.getInt(3)));

        }

the query gives me the following values:

1,0|2,1|3,1|4,2|...

And then I am trying to load this into the vaadin grid like the following:

     List<HashMap<SCPri, String>> rows = new ArrayList<>();

     LinkedHashMap<SCPri, String> fakeBean1 = subdao1.getSCMap(subcontractor.getId(),subcontractor.getCountryId());

     rows.add(fakeBean1);

     Grid<HashMap<SCPri, String>> grid2 = new Grid<>();

     grid2.setItems(rows);



     for (Map.Entry<SCPri, String> entry : s.entrySet()) {

         grid2.addColumn(h -> h.get(entry.getKey().getRegionname())).setCaption(entry.getKey().getRegionname());

     }

     addComponents(grid2);

I am not able to load the grid with the columns dynamically generated and one editable row of with values underneath those columns.
I am trying to make the grid look like the following:

r1|r2|r3|r4

0 |1 |1 |2

I tried to follow the following two links but failed to get it working:

How to fill Vaadin Grid with Map items type

https://vaadin.com/forum/thread/16038356/grid-8-without-bean-class

How can I achieve this?

edited Nov 22 '18 at 17:06

James Z

11.2k71936

asked Nov 22 '18 at 15:28

gopi

You say that your attempt doesn't work, but you don't mention in what way. Are there compilation errors, and in that case from what part? Are there runtime exceptions, and in that case what are the exception details? Does the wrong thing show up on the screen, and in that case what does it show?

– Leif Åstrand
Nov 23 '18 at 7:51

I am getting only the column names like r1,r2,r3,r4 with one empty row and no values. I dont see any exception or anything as such.

– gopi
Nov 23 '18 at 8:23

add a comment |

I am trying to load use this query and the values into a map

LinkedHashMap<SCRegionPriority, String> hash = new LinkedHashMap<>();

pstmt=("SELECT a.Id,a.RegionName,ISNULL(b.Priority,0) as priority 

      FROM dbo.region a left join dbo.SCMap b on a.Id = b.RegionId 

      and a.CountryId = b.CountryId and b.SCId=1 where a.CountryId ='1'")

ResultSet rs = pstmt.executeQuery();

con.commit();

    while (rs.next()) {

            SCPri c = new SCPri();

            c.setRegionid(rs.getInt(1));

            c.setRegionname(rs.getString(2));

            c.setPriority(rs.getInt(3));

            hash.put(c, String.valueOf(rs.getInt(3)));

        }

the query gives me the following values:

1,0|2,1|3,1|4,2|...

And then I am trying to load this into the vaadin grid like the following:

     List<HashMap<SCPri, String>> rows = new ArrayList<>();

     LinkedHashMap<SCPri, String> fakeBean1 = subdao1.getSCMap(subcontractor.getId(),subcontractor.getCountryId());

     rows.add(fakeBean1);

     Grid<HashMap<SCPri, String>> grid2 = new Grid<>();

     grid2.setItems(rows);



     for (Map.Entry<SCPri, String> entry : s.entrySet()) {

         grid2.addColumn(h -> h.get(entry.getKey().getRegionname())).setCaption(entry.getKey().getRegionname());

     }

     addComponents(grid2);

I am not able to load the grid with the columns dynamically generated and one editable row of with values underneath those columns.
I am trying to make the grid look like the following:

r1|r2|r3|r4

0 |1 |1 |2

I tried to follow the following two links but failed to get it working:

How to fill Vaadin Grid with Map items type

https://vaadin.com/forum/thread/16038356/grid-8-without-bean-class

How can I achieve this?

edited Nov 22 '18 at 17:06

James Z

11.2k71936

asked Nov 22 '18 at 15:28

gopi

You say that your attempt doesn't work, but you don't mention in what way. Are there compilation errors, and in that case from what part? Are there runtime exceptions, and in that case what are the exception details? Does the wrong thing show up on the screen, and in that case what does it show?

– Leif Åstrand
Nov 23 '18 at 7:51

I am getting only the column names like r1,r2,r3,r4 with one empty row and no values. I dont see any exception or anything as such.

– gopi
Nov 23 '18 at 8:23

add a comment |

I am trying to load use this query and the values into a map

LinkedHashMap<SCRegionPriority, String> hash = new LinkedHashMap<>();

pstmt=("SELECT a.Id,a.RegionName,ISNULL(b.Priority,0) as priority 

      FROM dbo.region a left join dbo.SCMap b on a.Id = b.RegionId 

      and a.CountryId = b.CountryId and b.SCId=1 where a.CountryId ='1'")

ResultSet rs = pstmt.executeQuery();

con.commit();

    while (rs.next()) {

            SCPri c = new SCPri();

            c.setRegionid(rs.getInt(1));

            c.setRegionname(rs.getString(2));

            c.setPriority(rs.getInt(3));

            hash.put(c, String.valueOf(rs.getInt(3)));

        }

the query gives me the following values:

1,0|2,1|3,1|4,2|...

And then I am trying to load this into the vaadin grid like the following:

     List<HashMap<SCPri, String>> rows = new ArrayList<>();

     LinkedHashMap<SCPri, String> fakeBean1 = subdao1.getSCMap(subcontractor.getId(),subcontractor.getCountryId());

     rows.add(fakeBean1);

     Grid<HashMap<SCPri, String>> grid2 = new Grid<>();

     grid2.setItems(rows);



     for (Map.Entry<SCPri, String> entry : s.entrySet()) {

         grid2.addColumn(h -> h.get(entry.getKey().getRegionname())).setCaption(entry.getKey().getRegionname());

     }

     addComponents(grid2);

I am not able to load the grid with the columns dynamically generated and one editable row of with values underneath those columns.
I am trying to make the grid look like the following:

r1|r2|r3|r4

0 |1 |1 |2

I tried to follow the following two links but failed to get it working:

How to fill Vaadin Grid with Map items type

https://vaadin.com/forum/thread/16038356/grid-8-without-bean-class

How can I achieve this?

edited Nov 22 '18 at 17:06

James Z

11.2k71936

asked Nov 22 '18 at 15:28

gopi

I am trying to load use this query and the values into a map

LinkedHashMap<SCRegionPriority, String> hash = new LinkedHashMap<>();

pstmt=("SELECT a.Id,a.RegionName,ISNULL(b.Priority,0) as priority 

      FROM dbo.region a left join dbo.SCMap b on a.Id = b.RegionId 

      and a.CountryId = b.CountryId and b.SCId=1 where a.CountryId ='1'")

ResultSet rs = pstmt.executeQuery();

con.commit();

    while (rs.next()) {

            SCPri c = new SCPri();

            c.setRegionid(rs.getInt(1));

            c.setRegionname(rs.getString(2));

            c.setPriority(rs.getInt(3));

            hash.put(c, String.valueOf(rs.getInt(3)));

        }

the query gives me the following values:

1,0|2,1|3,1|4,2|...

And then I am trying to load this into the vaadin grid like the following:

     List<HashMap<SCPri, String>> rows = new ArrayList<>();

     LinkedHashMap<SCPri, String> fakeBean1 = subdao1.getSCMap(subcontractor.getId(),subcontractor.getCountryId());

     rows.add(fakeBean1);

     Grid<HashMap<SCPri, String>> grid2 = new Grid<>();

     grid2.setItems(rows);



     for (Map.Entry<SCPri, String> entry : s.entrySet()) {

         grid2.addColumn(h -> h.get(entry.getKey().getRegionname())).setCaption(entry.getKey().getRegionname());

     }

     addComponents(grid2);

I am not able to load the grid with the columns dynamically generated and one editable row of with values underneath those columns.
I am trying to make the grid look like the following:

r1|r2|r3|r4

0 |1 |1 |2

I tried to follow the following two links but failed to get it working:

How to fill Vaadin Grid with Map items type

https://vaadin.com/forum/thread/16038356/grid-8-without-bean-class

How can I achieve this?

java vaadin vaadin8 vaadin-grid

edited Nov 22 '18 at 17:06

James Z

11.2k71936

asked Nov 22 '18 at 15:28

gopi

edited Nov 22 '18 at 17:06

James Z

11.2k71936

asked Nov 22 '18 at 15:28

gopi

edited Nov 22 '18 at 17:06

James Z

11.2k71936

edited Nov 22 '18 at 17:06

James Z

11.2k71936

edited Nov 22 '18 at 17:06

James Z

11.2k71936

asked Nov 22 '18 at 15:28

gopi

asked Nov 22 '18 at 15:28

gopi

asked Nov 22 '18 at 15:28

gopi

You say that your attempt doesn't work, but you don't mention in what way. Are there compilation errors, and in that case from what part? Are there runtime exceptions, and in that case what are the exception details? Does the wrong thing show up on the screen, and in that case what does it show?

– Leif Åstrand
Nov 23 '18 at 7:51

I am getting only the column names like r1,r2,r3,r4 with one empty row and no values. I dont see any exception or anything as such.

– gopi
Nov 23 '18 at 8:23

add a comment |

You say that your attempt doesn't work, but you don't mention in what way. Are there compilation errors, and in that case from what part? Are there runtime exceptions, and in that case what are the exception details? Does the wrong thing show up on the screen, and in that case what does it show?

– Leif Åstrand
Nov 23 '18 at 7:51

I am getting only the column names like r1,r2,r3,r4 with one empty row and no values. I dont see any exception or anything as such.

– gopi
Nov 23 '18 at 8:23

You say that your attempt doesn't work, but you don't mention in what way. Are there compilation errors, and in that case from what part? Are there runtime exceptions, and in that case what are the exception details? Does the wrong thing show up on the screen, and in that case what does it show?

– Leif Åstrand
Nov 23 '18 at 7:51

I am getting only the column names like r1,r2,r3,r4 with one empty row and no values. I dont see any exception or anything as such.

– gopi
Nov 23 '18 at 8:23

add a comment |

1 Answer
1

active

oldest

votes

A single row with empty cells implies that the value provider callback for each cell returns null (or "").

In your case, the value provider callback is h -> h.get(entry.getKey().getRegionname()). Here, h represents the row object, i.e. your single HashMap<SCPri, String> instance. I'm assuming getRegionname() returns something like a String, which would surely cause null results from h.get() since h uses SCPri instances as they key. Changing the callback to h -> h.get(entry.getKey()) instead might do the trick.

It is an unfortunate leftover from the pre-generics times that Map::get accepts any Object without compilation errors instead of requiring you to pass an instance of the actual key type of the map.

answered Nov 23 '18 at 8:55

Leif Åstrand

2,050510

Oh yes, entry.getKey() worked and i got the values. . I just have one more doubt regarding this. How can I set inline editor for this row as I am getting an error saying I cannot do it this way and need to add the mapping if I try to set using this line grid.addColumn(h -> h.get(entry.getKey())).setEditable(true).setEditorComponent(tf,h -> h.get(entry.getKey())).setCaption(entry.getKey().getRegionname()); Please suggest

– gopi
Nov 23 '18 at 10:50

Second parameter of setEditorComponent is a setter, not a getter. You could try something like (h, value) -> h.put(entry.getKey(), value))

– Leif Åstrand
Nov 23 '18 at 12:41

add a comment |

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1 Answer
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A single row with empty cells implies that the value provider callback for each cell returns null (or "").

answered Nov 23 '18 at 8:55

Leif Åstrand

2,050510

Oh yes, entry.getKey() worked and i got the values. . I just have one more doubt regarding this. How can I set inline editor for this row as I am getting an error saying I cannot do it this way and need to add the mapping if I try to set using this line grid.addColumn(h -> h.get(entry.getKey())).setEditable(true).setEditorComponent(tf,h -> h.get(entry.getKey())).setCaption(entry.getKey().getRegionname()); Please suggest

– gopi
Nov 23 '18 at 10:50

Second parameter of setEditorComponent is a setter, not a getter. You could try something like (h, value) -> h.put(entry.getKey(), value))

– Leif Åstrand
Nov 23 '18 at 12:41

add a comment |

A single row with empty cells implies that the value provider callback for each cell returns null (or "").

answered Nov 23 '18 at 8:55

Leif Åstrand

2,050510

Oh yes, entry.getKey() worked and i got the values. . I just have one more doubt regarding this. How can I set inline editor for this row as I am getting an error saying I cannot do it this way and need to add the mapping if I try to set using this line grid.addColumn(h -> h.get(entry.getKey())).setEditable(true).setEditorComponent(tf,h -> h.get(entry.getKey())).setCaption(entry.getKey().getRegionname()); Please suggest

– gopi
Nov 23 '18 at 10:50

Second parameter of setEditorComponent is a setter, not a getter. You could try something like (h, value) -> h.put(entry.getKey(), value))

– Leif Åstrand
Nov 23 '18 at 12:41

add a comment |

A single row with empty cells implies that the value provider callback for each cell returns null (or "").

answered Nov 23 '18 at 8:55

Leif Åstrand

2,050510

A single row with empty cells implies that the value provider callback for each cell returns null (or "").

answered Nov 23 '18 at 8:55

Leif Åstrand

2,050510

answered Nov 23 '18 at 8:55

Leif Åstrand

2,050510

answered Nov 23 '18 at 8:55

Leif Åstrand

2,050510

answered Nov 23 '18 at 8:55

Leif Åstrand

2,050510

Oh yes, entry.getKey() worked and i got the values. . I just have one more doubt regarding this. How can I set inline editor for this row as I am getting an error saying I cannot do it this way and need to add the mapping if I try to set using this line grid.addColumn(h -> h.get(entry.getKey())).setEditable(true).setEditorComponent(tf,h -> h.get(entry.getKey())).setCaption(entry.getKey().getRegionname()); Please suggest

– gopi
Nov 23 '18 at 10:50

Second parameter of setEditorComponent is a setter, not a getter. You could try something like (h, value) -> h.put(entry.getKey(), value))

– Leif Åstrand
Nov 23 '18 at 12:41

add a comment |

Oh yes, entry.getKey() worked and i got the values. . I just have one more doubt regarding this. How can I set inline editor for this row as I am getting an error saying I cannot do it this way and need to add the mapping if I try to set using this line grid.addColumn(h -> h.get(entry.getKey())).setEditable(true).setEditorComponent(tf,h -> h.get(entry.getKey())).setCaption(entry.getKey().getRegionname()); Please suggest

– gopi
Nov 23 '18 at 10:50

Second parameter of setEditorComponent is a setter, not a getter. You could try something like (h, value) -> h.put(entry.getKey(), value))

– Leif Åstrand
Nov 23 '18 at 12:41

Oh yes, entry.getKey() worked and i got the values. . I just have one more doubt regarding this. How can I set inline editor for this row as I am getting an error saying I cannot do it this way and need to add the mapping if I try to set using this line

grid.addColumn(h -> h.get(entry.getKey())).setEditable(true).setEditorComponent(tf,h -> h.get(entry.getKey())).setCaption(entry.getKey().getRegionname());

Please suggest

– gopi
Nov 23 '18 at 10:50

grid.addColumn(h -> h.get(entry.getKey())).setEditable(true).setEditorComponent(tf,h -> h.get(entry.getKey())).setCaption(entry.getKey().getRegionname());

Please suggest

– gopi
Nov 23 '18 at 10:50

Second parameter of setEditorComponent is a setter, not a getter. You could try something like (h, value) -> h.put(entry.getKey(), value))

– Leif Åstrand
Nov 23 '18 at 12:41

add a comment |

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