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











up vote
0
down vote

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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?










share|improve this question
























  • 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 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 at 8:23















up vote
0
down vote

favorite












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?










share|improve this question
























  • 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 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 at 8:23













up vote
0
down vote

favorite









up vote
0
down vote

favorite











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?










share|improve this question















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






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 22 at 17:06









James Z

11.1k71735




11.1k71735










asked Nov 22 at 15:28









gopi

63




63












  • 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 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 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 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 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 at 7:51






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 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 at 8:23




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 at 8:23












1 Answer
1






active

oldest

votes

















up vote
0
down vote













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.






share|improve this answer





















  • 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 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 at 12:41











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up vote
0
down vote













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.






share|improve this answer





















  • 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 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 at 12:41















up vote
0
down vote













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.






share|improve this answer





















  • 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 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 at 12:41













up vote
0
down vote










up vote
0
down vote









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.






share|improve this answer












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.







share|improve this answer












share|improve this answer



share|improve this answer










answered Nov 23 at 8:55









Leif Åstrand

1,43059




1,43059












  • 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 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 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 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 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 at 10:50






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 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 at 12:41




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 at 12:41


















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