oop - Best practice: A child node's knowledge about its parent -

-

i wanted idea of best practice how information child node in tree should know parent.

my current problem simple , straight-forward. have tree of information , wanted "full name" of leaf node (in case name of each node in tree leaf node separated dot). can either adding "getfullname" method leaf nodes traverses tree root , prepends each parent's name , returns final result require leaf nodes knowing class type of parent (leaf , non-leaf not same class). or can add utility function somewhere else same thing knows different class types.

i attempted search around question little broad useful hits on google.

thanks in advance.

you do have lot of options here, , yes question addresses common situation of trading off processing efficiency on 1 hand increased storage requirements , possible redundancy on other.

there no single best practice. space/time tradeoff depends on situation. if go redundant storage, keeping both child , parent links within nodes, need make sure data structure encapsulated , methods keep consistent.

since have use case traverse nodes top, parent links work fine , can compose full name via recursion or building string front. because use case situation, not bad idea.

another option store full name in node, adds redundancy in case move nodes.

in short, don't have worry violating best practices, should weigh choices in making choice right you.

now if making general-purpose tree data structure, such java's treenode, create interface , allow people implement things see fit, providing suitable general implementation (defaultmutabletreenode) has links -- parent, child, , sibling.


Comments

Post a Comment

Popular posts from this blog

c# - How to set Z index when using WPF DrawingContext? -

-
how set z-index drawing object when using drawingcontext.drawxxx() methods? the object drawn last have higher z index. can't change index of drawn objects. way draw in order. if using wpf (as placed tag), can use, example, canvas control. create shapes need like polyline obj = new polyline(); //... // ... set properties of obj and add them canvas uielementcollection: yourcanvasname.children.add(obj); //or yourcanvasname.children.insert(i, obj); first items of collection have higher z index. advantages in way: no need redraw on window changes, can anytime move objects , change order.
Read more

razor - Is this a bug in WebMatrix PageData? -

-
i think may have found bug in webmatrix's pagedata, not sure. concerns how pass data partial page calling page. in webmatrix documentation (tutorials, e.g. " 3 - creating consistent look ", , example code), pagedata recommended mechanism pass data between pages (e.g. content page layout page, or partial page). however have found not work other way, pass data partial page calling page. modifying or adding entries in pagedata in partial page, not seem calling page. cutting right down simplest possible example, in test page may have this: @{ pagedata["test"] = "initial entry"; } <p>before calling partial page, test value @pagedata["test"]</p> @renderpage("_testpartial.cshtml") <p>after returning calling page, test value @pagedata["test"]</p> and in _testpartial.cshtml page might have this: @{ pagedata["test"] = "modified entry"; } <p>in partial page...
Read more

visual c++ - Using relative values in array sorting ( asm ) -

-
i need sort through array , sort each individual row in array in ascending order. doesn't seem going (surprise!) keep getting hit 2 errors: a2101: cannot add 2 relocatable labels , a2026: constant expected here's sort, makes sense me, think i'm still trying implement high-lvl language techniqes assembly. there way around not being able use relative values? (the array 7 rows 9 columns, btw). mov cx, 7; cx = number of rows outer: ; outer loop walk through rows push cx mov cx, 9 mov row, cx ;rows middle: ; middle-loop walk through columns push cx sub cx, 1 ;cx = cx-1 mov column, cx ;columns inner: ;inner loop - compare , exchange column values cmp marray[row*9 + column], marray[row*9 + column+1] xchg marray[row*9 + column+1], marray[row*9 + column] ; compare , exchange values marray table inc column loop inner pop cx loop mid...
Read more