Sorting a List object
Hi!
I have a List object or component (java.awt.List) in my app.
I try to order it using Collections.sort(my_list) but I recieve this message which I dont understand:
The method sort(List<T>) in the type Collections is not applicable for the arguments (List)
By the way, I would like to order it using a numeric order, not an ascii order, so I guess I have to use "implements Comparable", but how can I use that if my List contains Strings?
I mean, my List has:
20 bla bla
9 bla bla
and I want this:
9 bla bla
20 bla bla bla
Any advice?
Thanks a lot for your time.
Edited by: Ricardo_Ruiz_Lopez on Dec 26, 2007 9:27 AM
You are mixing up two different kinds of Lists. One is the AWT List (java.awt.List) which is what you are using and can be thought of more as a visual component.
http://java.sun.com/javase/6/docs/api/java/awt/List.html
The other is the utility Collections List (java.util.List) which is purely a data construct.
http://java.sun.com/javase/6/docs/api/java/util/List.html
So, bottom line is, the Collections.sort( ) won't work with the AWT list. You'll have to extract your data model which I think may be a String[] and sort that, then possibly re-insert with add(String item, int index) (I'm not sure on this part).
Edited by: Encephalopathic on Dec 26, 2007 9:44 AM
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Implode wrote:
I have to hand in an assignment by Friday, and all I have to do still is write a method to sort the array list. Okay, if you have to write your own sort method, then the links I provided may not be that useful. They show you how to use the sort methods provided by the core API. You COULD still implement Comparable or Comparator. It would just be your sort routine calling it rather than the built-in ones.
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I would like to write method for sorting table of objects. Sorting will be according selected attribute of object.
My problem is that when I have dynamic data, I'm not able to access attributes of object. Here is example in code. Problematic lines are commented.
If you have any idea how to solve it, I will be very happy.
CLASS lcl_reflection DEFINITION CREATE PUBLIC.
PUBLIC SECTION.
CLASS-METHODS: sort_object_table_by_field IMPORTING field_name TYPE char72
direction TYPE c DEFAULT 'A'
CHANGING object_table TYPE table.
ENDCLASS. "lcl_reflection DEFINITION
CLASS lcl_reflection IMPLEMENTATION.
METHOD sort_object_table_by_field.
DATA: obj_type_desc TYPE REF TO cl_abap_refdescr,
cls_type_desc TYPE REF TO cl_abap_classdescr,
tab_type_desc TYPE REF TO cl_abap_tabledescr,
elm_type_desc TYPE REF TO cl_abap_elemdescr,
struc_type_desc TYPE REF TO cl_abap_structdescr,
line TYPE REF TO data,
tab TYPE REF TO data,
object TYPE REF TO data,
lt_component TYPE cl_abap_structdescr=>component_table,
ls_component LIKE LINE OF lt_component.
FIELD-SYMBOLS: <object> TYPE any,
<tab> TYPE table,
<line> TYPE any,
<value> TYPE any.
READ TABLE object_table INDEX 1 ASSIGNING <object>.
cls_type_desc ?= cl_abap_classdescr=>describe_by_object_ref( <object> ).
elm_type_desc ?= cls_type_desc->get_attribute_type( field_name ).
obj_type_desc ?= cl_abap_refdescr=>create( cls_type_desc ).
UNASSIGN <object>.
ls_component-name = 'key'.
ls_component-type = elm_type_desc.
APPEND ls_component TO lt_component.
ls_component-name = 'object'.
ls_component-type ?= obj_type_desc.
APPEND ls_component TO lt_component.
struc_type_desc ?= cl_abap_structdescr=>create( lt_component ).
tab_type_desc ?= cl_abap_tabledescr=>create( p_line_type = struc_type_desc
p_table_kind = cl_abap_tabledescr=>tablekind_std
p_unique = abap_false ).
REFRESH lt_component.
CLEAR ls_component.
CREATE DATA line TYPE HANDLE struc_type_desc.
CREATE DATA tab TYPE HANDLE tab_type_desc.
CREATE DATA object TYPE HANDLE obj_type_desc.
ASSIGN tab->* TO <tab>.
ASSIGN line->* TO <line>.
ASSIGN object->* TO <object>.
LOOP AT object_table REFERENCE INTO object.
APPEND INITIAL LINE TO <tab> REFERENCE INTO line.
ASSIGN object->* TO <value>.
ASSIGN line->* TO <line>.
* <line>-key = <value>->(field_name).
* <line>-object = object.
ENDLOOP.
* SORT <tab> BY key.
* LOOP AT <tab> REFERENCE INTO line.
* APPEND INITIAL LINE TO object_table REFERENCE INTO object.
* object = line-object.
* ENDLOOP.
ENDMETHOD. "sort_object_table_by_field
ENDCLASS. "lcl_reflection IMPLEMENTATIONOk guys, it's solved. It was little bit more complicated then I expected. Thanks for you help.
METHOD sort_object_table_by_field.
TYPES: t_object TYPE REF TO object.
DATA: obj_type_desc TYPE REF TO cl_abap_refdescr,
cls_type_desc TYPE REF TO cl_abap_classdescr,
tab_type_desc TYPE REF TO cl_abap_tabledescr,
elm_type_desc TYPE REF TO cl_abap_elemdescr,
struc_type_desc TYPE REF TO cl_abap_structdescr,
r_line TYPE REF TO data,
r_tab TYPE REF TO data,
r_object TYPE REF TO data,
r_obj TYPE REF TO data,
lt_component TYPE cl_abap_structdescr=>component_table,
ls_component LIKE LINE OF lt_component.
FIELD-SYMBOLS: <object> TYPE any,
<obj> TYPE REF TO object,
<tab> TYPE table,
<line> TYPE any,
<key> TYPE any,
<fs_key> TYPE any,
<fs_object> TYPE any.
READ TABLE object_table INDEX 1 ASSIGNING <object>.
cls_type_desc ?= cl_abap_classdescr=>describe_by_object_ref( <object> ).
elm_type_desc ?= cls_type_desc->get_attribute_type( field_name ).
obj_type_desc ?= cl_abap_refdescr=>create( cls_type_desc ).
UNASSIGN <object>.
ls_component-name = 'key'.
ls_component-type = elm_type_desc.
APPEND ls_component TO lt_component.
ls_component-name = 'object'.
ls_component-type ?= obj_type_desc.
APPEND ls_component TO lt_component.
struc_type_desc ?= cl_abap_structdescr=>create( lt_component ).
tab_type_desc ?= cl_abap_tabledescr=>create( p_line_type = struc_type_desc
p_table_kind = cl_abap_tabledescr=>tablekind_std
p_unique = abap_false ).
REFRESH lt_component.
CLEAR ls_component.
CREATE DATA r_line TYPE HANDLE struc_type_desc.
CREATE DATA r_tab TYPE HANDLE tab_type_desc.
CREATE DATA r_object TYPE HANDLE obj_type_desc.
CREATE DATA r_obj TYPE REF TO object.
ASSIGN r_tab->* TO <tab>.
LOOP AT object_table REFERENCE INTO r_object.
APPEND INITIAL LINE TO <tab> REFERENCE INTO r_line.
ASSIGN r_object->* TO <object>.
ASSIGN r_obj->* TO <obj>.
MOVE <object> TO <obj>.
ASSIGN <obj>->(field_name) TO <key>.
ASSIGN r_line->* TO <line>.
ASSIGN COMPONENT 'KEY' OF STRUCTURE <line> TO <fs_key>.
ASSIGN COMPONENT 'OBJECT' OF STRUCTURE <line> TO <fs_object>.
<fs_object> = <object>.
<fs_key> = <key>.
ENDLOOP.
DATA: sort_field TYPE fieldname.
sort_field = 'KEY'.
SORT <tab> BY (sort_field).
REFRESH object_table.
LOOP AT <tab> REFERENCE INTO r_line.
APPEND INITIAL LINE TO object_table REFERENCE INTO r_object.
ASSIGN r_line->* TO <line>.
ASSIGN r_object->* TO <object>.
ASSIGN COMPONENT 'OBJECT' OF STRUCTURE <line> TO <fs_object>.
<object> = <fs_object>.
ENDLOOP.
ENDMETHOD.
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