js39---组合模式，查找遍历树

Posted 2020-09-19 672530440

/**
 *有这样一个需求
 *有一个学校有2个班(一班,二班)
 *每个班级分2个小组(一班一组,一班二组,二班一组,二班二组)
 *学校计算机教室有限,每一个小组分着来上课.
 *考试的时候大家一起考
 *请用程序来模拟这个需求
 */
(function(){
    //不用组合模式
    //学校类
    var school = function(name){
        this.name = name;
        //班级
        var classes = new Array();
        this.addClasses = function(cla){
            classes.push(cla);
            return this;
        }
        this.getClasses = function(){
            return classes;
        }
    }
    //班级类
    var classes = function(name){
        this.name = name;
        var groups = new Array();
        this.getGroup = function(){
            return groups;
        }
        this.addGroup = function(group){
            groups.push(group);
            return this;
        }
    }
    //组
    var group  = function(name){
        this.name = name;
        var students = new Array();
        this.getStudent = function(){
            return students;
        }
        this.addStudent = function(stu){
            students.push(stu);
            return this;
        }
    }    
    //学生类
    var student  = function(name){
        this.name = name;
        this.goToClass = function(){
            document.write(this.name+" 去上课");
        }
        this.finishClass = function(){
            document.write(this.name+" 下课");
        }
    }
    
    //测试
    var a = new student("a");
    var b = new student("b");
    var c = new student("c");
    var d = new student("d");
    var e = new student("e");
    var f = new student("f");
    var g = new student("g");
    var h = new student("h");
    var i = new student("i");
    var one = new classes("一班");
        var oneOne = new group("一班一组");
            oneOne.addStudent(a).addStudent(b);
        var oneTwo = new group("一班二组");
            oneTwo.addStudent(c).addStudent(d);
        
        one.addGroup(oneOne).addGroup(oneTwo);
    var two = new classes("二班"); 
        var twoOne = new group("二班一组"); 
            twoOne.addStudent(e).addStudent(f);
        var twoTwo = new group("二班二组");
            twoTwo.addStudent(g).addStudent(h).addStudent(i)
        two.addGroup(twoOne).addGroup(twoTwo);
    var usPcat = new school("波斯卡特计算机培训学校");
    usPcat.addClasses(one).addClasses(two);
    
    //调用  就写一个 一班一组去上课
    var classes= usPcat.getClasses();
    for (var i = 0; i < classes.length; i++) {
        if(classes[i].name == "一班"){
            for (var j = 0; j < classes[i].getGroup().length; j++) {
//                document.write(classes[i].getGroup()[j])
                if(classes[i].getGroup()[j].name == "一班一组"){
                    var s = classes[i].getGroup()[j].getStudent();
                    for (var k = 0; k < s.length; k++) {
                        s[k].goToClass();
                    }
                }
            }
            
        }
    }
    //我快些吐了
    //这种方法一定不是和业务的扩展
})()

/**
 * 组合模式
 */
(function(){
    //统一接口
    var composite = new Interface("composite",["getChildByName","add"]);
    var student= new Interface("composite",["goToClass","finishClass"]);
    
    //定义组合类
    var compositeObj = function(name){
        this.name = name;
        this.type = "com";//默认是组合类
        var childs = new Array();
        //得到相关的所有孩子节点
        this.getChildByName = function(name){
            //涉及到递归
            var toChilds = new Array();
            if(!name){//没有传名字，左根遍历树
                for (var i = 0; i < childs.length; i++) {
                    if(childs[i].type == "com"){
                        toChilds = toChilds.concat(childs[i].getChildByName());
                    }else{
                        toChilds.push(childs[i]);
                    }
                }
            }else{//左先根查找树
                for (var i = 0; i < childs.length; i++) {
                    if(childs[i].name == name){
                        if(childs[i].type == "com"){
                            toChilds =     toChilds.concat(childs[i].getChildByName());
                            break;
                        }else{
                            toChilds.push(childs[i]);
                            break;
                        }
                    }else{
                        if(childs[i].type == "com"){
                            toChilds =     toChilds.concat(childs[i].getChildByName(name)); 
                        }
                    }
                }
            }
            return toChilds; 
        }
        //增加子节点
        this.add = function(child){
            childs.push(child);
            return this;
        }
        //去上课
        this.goToClass = function(name){
            var toChilds = this.getChildByName(name);
            for (var i = 0; i < toChilds.length; i++) {
                toChilds[i].goToClass();
            }
        }
        //下课
        this.finishClass = function(name){
            var toChilds = this.getChildByName(name);
            for (var i = 0; i < toChilds.length; i++) {
                toChilds[i].finishClass();
            }            
        }
        Interface.ensureImplements(this,composite,student)
    }
    
    //定义叶子类
    var studentObj = function(name){
        this.name = name;
        this.type = "stu";//默认是叶子    
        //得到相关的所有孩子节点
        this.getChildByName = function(name){
            if(this.name == name){
                return this;
            }else{
                return null;
            }
        }
        //增加子节点
        this.add = function(child){
            throw new Error("add 不成被初始化(在叶子了中)");
        }
        //去上课
        this.goToClass = function(name){
            document.write(this.name +" 去上课<br>");
        }
        //下课
        this.finishClass = function(name){
            document.write(this.name +" 下课<br>");
        }    
        Interface.ensureImplements(this,composite,student)        
    }
    
    //测试
    var a = new studentObj("a");
    var b = new studentObj("b");
    var c = new studentObj("c");
    var d = new studentObj("d");
    var e = new studentObj("e");
    var f = new studentObj("f");
    var g = new studentObj("g");
    var h = new studentObj("h");
    var i = new studentObj("i");
    var one = new compositeObj("一班");
        var oneOne = new compositeObj("一班一组");
            oneOne.add(a).add(b);
        var oneTwo = new compositeObj("一班二组");
            oneTwo.add(c).add(d);
        
        one.add(oneOne).add(oneTwo);
    var two = new compositeObj("二班"); 
        var twoOne = new compositeObj("二班一组"); 
            twoOne.add(e).add(f);
        var twoTwo = new compositeObj("二班二组");
            twoTwo.add(g).add(h).add(i)
        two.add(twoOne).add(twoTwo);
    var usPcat = new compositeObj("波斯卡特计算机培训学校");
    usPcat.add(one).add(two);
    //客户端调用API
    usPcat.goToClass();
    document.write("-------------------------<br>");
    usPcat.goToClass("一班");
    document.write("-------------------------<br>");
    usPcat.goToClass("二班一组");
    document.write("-------------------------<br>");
    usPcat.goToClass("a");    
})()