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Implementation of directory tree based on composoite pattern in the Typescript
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| //Composite Pattern | |
| //component | |
| interface Component{ | |
| add(child:Component):bool; | |
| remove(child:Component):bool; | |
| getChildren():Component[]; | |
| getName():string; | |
| isItem():bool; | |
| } | |
| //leaf | |
| class Item implements Component { | |
| constructor(private name: string){ | |
| } | |
| add(child:Component):bool{ | |
| throw new Error("this object is Item."); | |
| } | |
| remove(child:Component):bool{ | |
| throw new Error("this object is Item."); | |
| } | |
| getChildren():Component[]{ | |
| throw new Error("this object is Item."); | |
| } | |
| getName():string{ | |
| return this.name; | |
| } | |
| isItem():bool{ | |
| return true; | |
| } | |
| } | |
| //composite | |
| class Directory implements Component{ | |
| items:Component[]; | |
| constructor(private name: string){ | |
| this.items = new Array(); | |
| } | |
| add(child:Component):bool{ | |
| this.items.push(child); | |
| return true; | |
| } | |
| remove(child:Component):bool{ | |
| for (var i : number = this.items.length - 1; i >= 0; i--) { | |
| if(this.items[i].getName() === child.getName()){ | |
| this.items.splice(i, 1); | |
| i++; | |
| } | |
| } | |
| return true; | |
| } | |
| getChildren():Component[]{ | |
| return this.items; | |
| } | |
| getName():string{ | |
| return this.name; | |
| } | |
| isItem():bool{ | |
| return false; | |
| } | |
| } |
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| <html> | |
| <html> | |
| <head> | |
| <script type="text/javascript" src="composite_pattern.js"></script> | |
| <script type="text/javascript"> | |
| window.onload=function(){ | |
| var $ = function(id){return document.getElementById(id);} | |
| //init tree | |
| var tree = new Directory("root"); | |
| var sub_dir1 = new Directory("src"); | |
| var file_1 = new Item("Readme.txt"); | |
| var file_2 = new Item("build.xml"); | |
| var sub_dir2 = new Directory("libs"); | |
| var sub_dir3 = new Directory("bin"); | |
| tree.add(sub_dir1); | |
| tree.add(sub_dir2); | |
| tree.add(sub_dir3); | |
| tree.add(file_1); | |
| tree.add(file_2); | |
| sub_dir1.add(new Item("Main.java")); | |
| sub_dir1.add(new Item("Util.java")); | |
| sub_dir1.add(new Item("Log.java")); | |
| sub_dir2.add(new Item("library.jar")); | |
| sub_sub_dir1 = new Directory("ext"); | |
| sub_sub_dir1.add(new Item("support.jar")); | |
| sub_dir2.add(sub_sub_dir1); | |
| sub_dir3.add(new Item("Main.class")); | |
| //renderer | |
| function renderTree(tree, padding){ | |
| var div = document.createElement("div"); | |
| div.style.paddingLeft=padding+"px"; | |
| div.innerHTML = tree.getName(); | |
| $("area").appendChild(div); | |
| if(!tree.isItem()){ | |
| var children = tree.getChildren(); | |
| for(var i = children.length - 1; i >= 0; i--){ | |
| renderTree(children[i], padding+20); | |
| } | |
| } | |
| } | |
| renderTree(tree, 0); | |
| } | |
| </script> | |
| </head> | |
| <body> | |
| <h3>Composite Pattern</h3> | |
| <div id="area"> | |
| </div> | |
| </body> | |
| </html> |
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