General tree structure

Is there still no general tree structure in Java? I'd like something along the likes of TreeSet or TreeMap, but without the compare part, and where each node can hold 0..n children.
I know this is easy to implement, having done quite a few during my student years, but if any of the API classes are able to handle it directly, I'd sure like to know.
Does anyone know of any fitting classes?

Maybe you can use DefaultMutableTreeNode. It's a general tree class of Swing.
Or why not encode the tree structure in a key. Say you have up to 10 mother companies each having up to 10 daugthers. You can code these 100 companies as numbers between 0 and 99. For example 52 would be the second daughter of the fifth mother, etcetera. Then you just keep the objects sorted on key in an ArrayList or maybe use a HashMap depending on your searching needs.

Similar Messages

Tree Structure Implementation in Java.

1>
How should i implement a "Tree Structure" in Java Based application.?How would i map the entries to the database table?how many tables will i require for this implementation.?
List records<String> = new ArrayList<String>();
records.add("null");
records.add("Product");
records.add("Category");
records.add("P1");
records.add("P2");
records.add("P3");
records.add("C1");
records.add("C2");
records.add("C3");
so how should i implement a Tree Structure for the above record set.
//P1,P2,P3 belong to Parent {Product}
//C1,C2,C3 belong to Parent {Category}
Sample code provided will be helpful

How should i implement a "Tree Structure" in Java Based application.?The quotes suggest you don't know what a tree structure is, regardless of the development language. Fix that first (your understanding of what a tree structure is). [url http://en.wikipedia.org/wiki/Tree_structure]Here is probably a good start.
How would i map the entries to the database table?how many tables will i require for this implementation.?It depends on what your tree structure represents, in particular it depends on whether the leaves and intermediate nodes of the trees have are homogeneous (e.g. have a common interface). There is no general rule.
I suggest you start by looking in the Java API at all the classes whose names start with 'Tree' (TreeSet and TreeMap are probably the best ones to start with) and read the documentation carefully. Then try to write some code that uses one and come back if/when you have any problems.(sorry Winston) I think this is a very bad advice.
These classes are particular implementations, respectively of a set (in the mathematical sense) and of a map (associative table), which happen to use a "tree structure" for their internal business. Their API doesn't help building a custom "tree structure" (they may be used that way, but it's certainly not the easiest nor even a particular handy way to build tree structures).
Maybe their implementation may be a good example of how to build a Tree structure, but they use a particular type of tree (+red-black tree), not a general one. This may or may not be the OP's case, I wouldn't bet on it.
OP you're welcome to come back with more specific questions and details. Good luck with Java.
Edited by: jduprez on Oct 16, 2010 2:45 PM
Edited by: jduprez on Oct 16, 2010 2:49 PM
After checking the Javadoc: indeed TreeSet only uses a TreeMap for its implementation, so the only one out of the two which does directly uses a tree structure in its implementation is TreeMap.
Edited by: jduprez on Oct 16, 2010 2:51 PM
And, to reiterate, I stand by my claim that TreeMap is not a good example of a general Tree structure: in particular it uses a tree to map keys to values, its main business is the "mapping" part, not the tree as a storage medium. Neither the keys nor the values know anything about their "children".

Finding elements in a general tree

I am writing a method to find elements in a general tree structure. The structure has a root and each parent node has 0-10 children, whose nodes are stored in an array linked to the parent node. The node class for the tree has a variable info that stores Comparable information. It has a variable numbChildren for the number of children that node has. It also has an array of size 10 containing links to up to 10 child tree nodes. Methods in the node class are getter and setters for child nodes. For example, if a parent node has 5 children, you can access the 3 child of that parent by doing parent.getChild(3-1); There are also getters and setters for the info of the node.
My problem is I have a general tree structure made of the nodes described above, and I need to search that tree to find a given element and return a reference to the node containing the element if it is found. Can someone help give me ideas about how I can search the tree? Just to clarify, a general tree structure is a structure where parent nodes can have any number of children (but in this case there are a max of 10 children allowed.
thanks for any help

For any given node, you check to see if the given node contains the item you're searching for. If not, you check the appropriate child node (since the child nodes are ordered, you should only have to check one). This is called recursion, and your class probably covered it if they gave you this assignment. Start at the root.

MSS ECM new column in Organization unit Tree structure

Hi All
Requirement is to add aditional column in in Selection Screen of ECM, when user selects dropdown value "Employee Selection by Organization Unit".
Currently i get only Tree Structure of org unit. Need to add Custom (or columns if provided by SAP ) in Org unit level.
Thanks in advance.
Regards,
Chinmaya

Employee search this is possible but not in Team calendar
In MSS 1.0 under employee information we have three pages:General
Information, Compensation Information and Personnel Development .
All these pages have different employee search iview.
Basically employee search iview(properties) is responsible for display
of Organization Hierarchy as table or tree.
In employee search iview we have iview property "Organizational struct-
ure with list display in navigation area" Sap.xss.tmv.navlistorgviews.
This property enables you to define the navigation objects for an
organizational structure view are to be displayed in a
table as opposed to a tree hierarchy. In the standard system, navigation
objects are displayed in a tree structure.
You can enter the following organizational structure views:
- Organizational structure views with a navigation area that belong to
the organizational structure view group you defined with the property
sap.xss.tmv.orgviewgroup. (Group of Organizational structure views)
- Organizational structure view you define with the property sap.xss.tmv
.orgview(Individual organizational structure view) provided it has
navigation area.
For e.g.,
Let say, you would like to display maintain position requirements,
navigation objects as table.
Let say in backend you had defined following Organization structure
views:
MSS_TMV_EE_ORG1#Employees from Organizational Units
MSS_TMV_EE_ORG2#Employees from Organizational Structure
From Content administration ->Portal content ->#. Choose
Employee Search iview (for compensation information).
Now in the iview property "Organizational structure views with list
display in navigation area" maintain MSS_TMV_EE_ORG1,MSS_TMV_EE_ORG2
Now for all cases you will get navigation objects as table display.

How to create a tree structure using forms.

Hi,
How do i create a tree structure using oracle forms,i have a table named Functions and a specific column 'Function Name' should be displayed in the tree nodes.Can anyone help me out on how to create a tree structure and populating the nodes??
thanks in advance
Regards
Karthik

The FTree package provides functions to populate the tree - look for the topic "Manipulating a hierarchical tree at runtime
" in the online help this point to all the functions and triggers

How to show alv report in tree structure

hi all,
how to show data or create a alv report in tree structure.
thanks in advance.
Harsha

Hi Harsha,
Its done using FM 'RS_TREE_CONSTRUCT'
and FM for displaying the tree: 'RS_TREE_LIST_DISPLAY'
Thanks
Shrila

How to get Text for nodes in Tree Structure

Hi Friends,
How to get Text for nodes in Tree Structure
REPORT YFIIN_REP_TREE_STRUCTURE no standard page heading.
                   I N I T I A L I Z A T I O N
INITIALIZATION.
AUTHORITY-CHECK OBJECT 'ZPRCHK_NEW' :
                  ID 'YFIINICD' FIELD SY-TCODE.
IF SY-SUBRC NE 0.
    MESSAGE I000(yFI02) with SY-TCODE .
    LEAVE PROGRAM.
ENDIF.
class screen_init definition create private.
Public section
public section.
    class-methods init_screen.
    methods constructor.
Private section
private section.
    data: container1 type ref to cl_gui_custom_container,
          container2 type ref to cl_gui_custom_container,
          tree type ref to cl_gui_simple_tree.
    methods: fill_tree.
endclass.
Class for Handling Events
class screen_handler definition.
Public section
public section.
    methods: constructor importing container
               type ref to cl_gui_custom_container,
             handle_node_double_click
               for event node_double_click
               of cl_gui_simple_tree
               importing node_key .
Private section
private section.
endclass.
*&                        Classes implementation
class screen_init implementation.
*&                        Method INIT_SCREEN
method init_screen.
    data screen type ref to screen_init.
    create object screen.
endmethod.
*&                        Method CONSTRUCTOR
method constructor.
    data: events type cntl_simple_events,
          event like line of events,
          event_handler type ref to screen_handler.
    create object: container1 exporting container_name = 'CUSTOM_1',
                   tree exporting parent = container1
                     node_selection_mode =
            cl_gui_simple_tree=>node_sel_mode_multiple.
    create object: container2 exporting container_name = 'CUSTOM_2',
    event_handler exporting container = container2.
event-eventid = cl_gui_simple_tree=>eventid_node_double_click.
    event-appl_event = ' '.   "system event, does not trigger PAI
    append event to events.
    call method tree->set_registered_events
         exporting events = events.
    set handler event_handler->handle_node_double_click for tree.
     call method: me->fill_tree.
endmethod.
*&                        Method FILL_TREE
method fill_tree.
    data: node_table type table of abdemonode,
          node type abdemonode.
types:    begin of tree_node,
          folder(50) type c,
          tcode(60) type c,
          tcode1(60) type c,
          tcode2(60) type c,
          text(60) type c,
          text1(60) type c,
          text2(60) type c,
          end of tree_node.
data: wa_tree_node type tree_node,
            t_tree_node type table of tree_node.
wa_tree_node-folder = text-001.
wa_tree_node-tcode = text-002.
wa_tree_node-text = 'Creditors ageing'.
wa_tree_node-tcode1 = text-003.
wa_tree_node-text1 = 'GR/IR aging'.
wa_tree_node-tcode2 = text-004.
wa_tree_node-text2 = 'Bank Balance'.
append wa_tree_node to t_tree_node.
clear wa_tree_node .
wa_tree_node-folder = text-005.
wa_tree_node-tcode = text-006.
wa_tree_node-text = 'Creditors ageing'.
wa_tree_node-tcode1 = text-007.
wa_tree_node-text1 = 'Creditors ageing'.
wa_tree_node-tcode2 = text-008.
wa_tree_node-text2 = 'Creditors ageing'.
append wa_tree_node to t_tree_node.
clear wa_tree_node .
wa_tree_node-folder = text-009.
wa_tree_node-tcode = text-010.
wa_tree_node-text = 'Creditors ageing'.
wa_tree_node-tcode1 = text-011.
wa_tree_node-text1 = 'Creditors ageing'.
wa_tree_node-tcode2 = text-012.
wa_tree_node-text2 = 'Creditors ageing'.
append wa_tree_node to t_tree_node.
clear wa_tree_node .
node-hidden = ' '.                 " All nodes are visible,
    node-disabled = ' '.               " selectable,
    node-isfolder = 'X'.                                    " a folder,
    node-expander = ' '.               " have no '+' sign forexpansion.
    loop at t_tree_node into wa_tree_node.
      at new folder.
        node-isfolder = 'X'.                      " a folder,
        node-node_key = wa_tree_node-folder.
               clear node-relatkey.
        clear node-relatship.
        node-text = wa_tree_node-folder.
        node-n_image =   ' '.
        node-exp_image = ' '.
        append node to node_table.
      endat.
     at new tcode .
        node-isfolder = ' '.                          " a folder,
        node-n_image =   '@CS@'.       "AV is the internal code
        node-exp_image = '@CS@'.       "for an airplane icon
        node-node_key = wa_tree_node-tcode.
         node-text = wa_tree_node-text .
                 node-relatkey = wa_tree_node-folder.
        node-relatship = cl_gui_simple_tree=>relat_last_child.
      endat.
      append node to node_table.
    at new tcode1 .
        node-isfolder = ' '.                          " a folder,
        node-n_image =   '@CS@'.       "AV is the internal code
        node-exp_image = '@CS@'.       "for an airplane icon
        node-node_key = wa_tree_node-tcode1.
                 node-relatkey = wa_tree_node-folder.
        node-relatship = cl_gui_simple_tree=>relat_last_child.
          node-text = wa_tree_node-text1.
     endat.
      append node to node_table.
       at new tcode2 .
        node-isfolder = ' '.                          " a folder,
        node-n_image =   '@CS@'.       "AV is the internal code
        node-exp_image = '@CS@'.       "for an airplane icon
        node-node_key = wa_tree_node-tcode2.
                 node-relatkey = wa_tree_node-folder.
        node-relatship = cl_gui_simple_tree=>relat_last_child.
        node-text = wa_tree_node-text2.
     endat.
      append node to node_table.
    endloop.
    call method tree->add_nodes
         exporting table_structure_name = 'ABDEMONODE'
                   node_table = node_table.
endmethod.
endclass.
*&                        Class implementation
class screen_handler implementation.
*&                        Method CONSTRUCTOR
method constructor.
   create object: HTML_VIEWER exporting PARENT = CONTAINER,
                  LIST_VIEWER exporting I_PARENT = CONTAINER.
endmethod.
*&                 Method HANDLE_NODE_DOUBLE_CLICK
method handle_node_double_click.
case node_key(12).
when 'Creditors'.
submit YFIIN_REP_CREADITORS_AGING via selection-screen and return.
when 'Vendor'.
submit YFIIN_REP_VENDOR_OUTSTANDING via selection-screen and return.
when 'Customer'.
submit YFIIN_REP_CUSTOMER_OUTSTANDING via selection-screen and
return.
when 'GR/IR'.
submit YFIIN_REP_GRIR_AGING via selection-screen and return.
when 'Acc_Doc_List'.
submit YFIIN_REP_ACCOUNTINGDOCLIST via selection-screen and return.
when 'Bank Bal'.
submit YFIIN_REP_BANKBALANCE via selection-screen and return.
when 'Ven_Cus_Dtl'.
submit YFIIN_REP_VENDORCUST_DETAIL via selection-screen and return.
when 'G/L_Open_Bal'.
submit YFIIN_REP_OPENINGBALANCE via selection-screen and return.
when 'Usr_Authn'.
submit YFIIN_REP_USERAUTHRIZATION via selection-screen and return.
endcase.
endmethod.
endclass.
Program execution ************************************************
load-of-program.
call screen 9001.
at selection-screen.
Dialog Modules PBO
*&      Module STATUS_9001 OUTPUT
      text
module status_9001 output.
set pf-status 'SCREEN_9001'.
set titlebar 'TIT_9001'.
call method screen_init=>init_screen.
endmodule.                 " STATUS_9001 OUTPUT
Dialog Modules PAI
*&      Module USER_COMMAND_9001 INPUT
      text
module user_command_9001 input.
endmodule.                 " USER_COMMAND_9001 INPUT
*&      Module exit_9001 INPUT
      text
module exit_9001 input.
case sy-ucomm.
when 'EXIT'.
set screen 0.
endcase.
endmodule.
        exit_9001 INPUT

you can read the table node_table with nody key value which imports when docubble click the the tree node (Double clifk event).
Regards,
Gopi .
Reward points if helpfull.

How to use ONE query to find out tree structure?

ID------------upperID----------Name------------------------isFolder
1------------ 0---------- Folder
1------------------------------------1
2------------ 1------------ Folder 1- Sub
Folder--------------------1
3------------ 2------------
Folder1-Item1-A--------------------------0
4------------ 1------------ Folder 1- Sub
Item-----------------------0
Hi all, if I have a table like above to demonstrate the
folders and item relationship. This structure allows the user to
create unlimited folders and items.
Now I would like to use one query to find out the tree
structure of this table, how could I do the query.
Any help on this will be highly appreciated!
Thanks,
ez

Also, see this thread:
http://www.adobe.com/cfusion/webforums/forum/messageview.cfm?forumid=1&catid=7&threadid=12 55788&enterthread=y

How to create a form on a tree structured table

Hi,
I have a table that is designed to do a tree structure like:
Table Name: test
Fields:
ID
ParentID
Description
I created a browser (IR) (page 1) that calls a form (page 2)
The form has the editing fields and at the bottom layer I have a reports region where I display the children records using a query like:
select * from test where ParentID = :P2_ID
I need at the region level to add a button to call a form to edit the child record (which is the same table) and when done, to return to the form again but to the parent record.
How can I do that successfully? Is there any example:?
Thank you

Maybe this can help:
http://apex.oracle.com/pls/otn/f?p=31517:157
using instead of trigger on a view.
Denes Kubicek
http://deneskubicek.blogspot.com/
http://www.opal-consulting.de/training
http://apex.oracle.com/pls/otn/f?p=31517:1
-------------------------------------------------------------------

How to create Tree structure in Visual Composer

Hi All,
I need to develop tree structure in my VC application. Can any one of you please suggest me the steps to do it.Its very urgent please can any one help me out in this.
Regards,
Lakshmi

Hi Nutan,
if you want to solve it with webdynpro it depends on your skills in java and abap. There are books available to start with webdynpro and there are examples for building tree structures with Webdynpro.
[Java Webdynpro|http://www.sappress.com/product.cfm?account=&product=H983]
[ABAP Webdynpro|http://www.sappress.com/product.cfm?account=&product=H1916]
If you want to do it in VC you have to write e.g. an ABAP rfc function module, which returns you the tree with the information about childnode, parentnode and so on, so that you can display it in the table. But if the users click on sort then the tree is "destroyed". You can also display only a few levels of your tree and when you select a certain node a drill down is done by calling a rfc which returns the child nodes of the corresponding node.
But I think the solution with VC is not the best. Use webdynpro for this requirements.
Best Regards,
Marcel

How to get Tree structure in JSP page?

Hi,
I would like get data from the database and display the data in tree structure with the check boxes at each nodes on a jsp page with out using any third party tools. how can i do that? Do i require any new tags to fulfill this requirement?
can any one help me out by sending any example code?
thanks in advance.
Regards,
Reddy

Once you have the data in a list or something, can't you just use <c:forEach> and then output standard nested <ul> and <li> tags to give the tree structure.
<html>
     <style>
          li
               list-style-type:none;
     </style>
     <body>
          <form>
               <ul>
                    <li>
                         <input type="checkbox">Check 1</input>
                         <ul>
                              <li>
                                   <input type="checkbox">Check 1A</input>
                              </li>
                              <li>
                                   <input type="checkbox">Check 1B</input>
                              </li>
                         </ul>
                    </li>
                    <li>
                         <input type="checkbox">Check 2</input>
                         <ul>
                              <li>
                                   <input type="checkbox">Check 2A</input>
                              </li>
                         </ul>
                    </li>
                    <li>
                         <input type="checkbox">Check 3</input>
                    </li>
               </ul>
          </form>
     </body>
</html>

How can I create a Tree Structure in java ??

Hi,
I want to create a tree structure(objects hierarchy) using java language. Is there any API method for this ?
Can any one please give me a hint or suggestion how I can do this ??
Thanks for the help in advance.

Do you mean graphically?
You can use a TreeSet or TreeMap if you just want to use tree structures.
Kaj

How to get tree structure navigation in module pool program

please send me a sample code for getting tree structure navigation in a screen in module pool program.
ex.
masters
items

do a chain and endchain on the fields.Then insert the fields in to the required database.

How to get the folder name of selected subitem in tree structure?

Hi All,
           I created a tree structure like below.
         ->Folder1-- 1
                          2
                          3
        ->Folder2-----1
                           2
                           3
                i.e i have two folders & each folder having the values like above.Now i want to perform some action by clicking on the any of the values.Suppose if i click value 2,i want to do some action.the actions need to perform is varies from floder to to folder.
        So How can i get the folder name of clicked Value?
Regards,
Ravi

Hi Kumar ,
the below code should help you.
Register the below action for the leaf node for which u need the subfolder's name above it.
Worked fine in my system ...hope it does in ur scenario too
method ONACTIONGET_PATH .
data : lr_element TYPE REF TO if_wd_context_element,
         lr_node TYPE REF TO if_wd_context_node,
         ls_path type string,
         ls_path_node TYPE string,
         lt_string type TABLE OF string,
         l_lines type i,
         l_lines_1 TYPE i.
lr_element = wdevent->get_context_element( 'CONTEXT_ELEMENT' ).
**-> getting the path of the node/leaf
*which u had clicked and from that getting the node above it
ls_path = lr_element->get_path( ).
SPLIT ls_path at '.' into table lt_string.
-> remove the first 2 entries as they will contain the view name
DELETE lt_string FROM 1 to 2.
l_lines = LINES( lt_String ).
l_lines_1 = l_lines - 1.
-> remove the last 2 entries as they will contain the element in the path
DELETE lt_string from l_lines_1 to l_lines.
LOOP AT lt_string into ls_path.
    CONCATENATE LINES OF LT_STRING into ls_path_node SEPARATED BY '.'.
ENDLOOP.
**-> getting access to the node above the leaf element
LR_NODE = WD_CONTEXT->PATH_GET_NODE( path = ls_path_node ).
lr_element = lr_node->get_element( ).
**-> Getting the name of the folder...
*here path is the attribute in my context which stores the name of the folder
lr_element->get_attribute( EXPORTING name = 'PATH' IMPORTING value = ls_path ).
endmethod.

How to create a PortalSite map in a tree structure

Hi,
We are trying to reuse SAP Portal EP 7.3 standard functionalities related to create a Portal Site Map.
I've seen the procedure to create a Workset map iview (http://help.sap.com/saphelp_nw73/helpdata/en/49/32a7a9e8c45aaae10000000a42189d/frameset.htm), but we are interested in generate this map contained in a tree structure, because currently the SAP EP 7.1 brings the menu and option format.
I would like to know if this is possible using the standard functionalities or it is required to develop any application?
Please if you could help me it would be really useful.
Thanks in advance,

Thanks for your help Srinivas,
I was trying to know if it was possible to assign a style or layout to the site map iview created using the standard map iview delivered by SAP EP 7.3. I was looking for documentation but it is not enough at all and in my project we are still working with SAP EP 7.0
Please, if anyone could know about the map site iview standard and the available styles or maybe it is not changeable.
In that case, the only way it would be a development to get the tree structure.
Thanks!!!!

General tree structure

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