composite pattern

README.md

@@ -26,7 +26,7 @@ A curated collection of idiomatic design & application patterns for Go language.
 | Pattern | Description | Status |
 |:-------:|:----------- |:------:|
 | [Bridge](/structural/bridge/main.go) | Decouples an interface from its implementation so that the two can vary independently | ✔ |
-| [Composite](/structural/composite.md) | Encapsulates and provides access to a number of different objects | ✘ |
+| [Composite](/structural/composite/main.go) | Encapsulates and provides access to a number of different objects | ✔ |
 | [Decorator](/structural/decorator.md) | Adds behavior to an object, statically or dynamically | ✔ |
 | [Facade](/structural/facade.md) | Uses one type as an API to a number of others | ✘ |
 | [Flyweight](/structural/flyweight.md) | Reuses existing instances of objects with similar/identical state to minimize resource usage | ✘ |

structural/composite/main.go

@@ -0,0 +1,68 @@
+// 组合模式 composite pattern.
+// 用于表示树形的结构，这里以一个web静态目录为例
+package main
+
+type File struct {
+	IsDir bool
+	Name string
+	ChildFile []*File
+}
+
+func (f *File)AddChild(file ...*File){
+	f.ChildFile = append(f.ChildFile ,file...)
+}
+
+func checkFile(file *File) {
+	println("into dir ->" ,file.Name)
+	for _ ,v := range file.ChildFile{
+		if v.IsDir{
+			checkFile(v)
+		}else{
+			println("dir ->" ,file.Name ,".fileName ->" ,v.Name)
+		}
+	}
+}
+
+func main(){
+	/*
+	static|
+		-js|
+			-jquery.js
+			-main|
+				-index.js
+				-login.js
+		-css|
+			-bootstrap.css
+	 */
+	static := &File{true ,"static" ,make([]*File ,0)}
+	js := &File{true ,"js" ,make([]*File ,0)}
+	css := &File{true ,"css" ,make([]*File ,0)}
+	static.AddChild(js ,css)
+
+	jquery := &File{false ,"jquery.js" ,nil}
+	mjs := &File{true ,"main" ,make([]*File ,0)}
+	js.AddChild(jquery ,mjs)
+
+	injs := &File{false ,"index.js" ,nil}
+	lojs := &File{false ,"login.js" ,nil}
+	mjs.AddChild(injs ,lojs)
+
+
+	btstrap := &File{false ,"bootstrap.css" ,nil}
+	css.AddChild(btstrap)
+
+	checkFile(static)
+	/*
+	output:
+	into dir -> static
+	into dir -> js
+	dir -> js .fileName -> jquery.js
+	into dir -> main
+	dir -> main .fileName -> index.js
+	dir -> main .fileName -> login.js
+	into dir -> css
+	dir -> css .fileName -> bootstrap.css
+	 */
+}
+
+