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@wintercn
Last active May 3, 2020
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JS Factory demo
const categories = [
{id:'animals', parent:null},
{id:'mammals', parent:'animals'},
{id:'cats', parent:'mammals'},
{id:'dogs', parent:'mammals'},
{id:'chihuahua', parent:'dogs'},
{id:'labrador', parent:'dogs'},
{id:'persian', parent:'cats'},
{id:'siamese', parent:'cats'},
]
//经典Abstract Factory
class AbstractTreeNode {
constructor(data){
this.id = data.id;
this.children = [];
this.map = new Map();
this.map.set(this.id, this);
}
insert(factory, item){
const node = factory.create(item);
if(this.map.get(item.parent))
this.map.get(item.parent).append(node);
}
append(node){
node.parent = this;
this.children.push(node);
var current = this;
while(current) {
current.map.set(node.id, node);
current = current.parent;
}
}
}
AbstractTreeNode.fromItems = function fromItems(factory, items) {
let root = null;
for(let item of items) {
if(item.parent != null)
root.insert(factory, item);
else
root = factory.create(item);
}
return root;
}
class TreeNode1 extends AbstractTreeNode {
}
class AbstractTreeNodeFactory {
}
class TreeNode1Factory extends AbstractTreeNodeFactory{
create(item){
return new TreeNode1(item);
}
}
AbstractTreeNode.fromItems(new TreeNode1Factory, categories)
const categories = [
{id:'animals', parent:null},
{id:'mammals', parent:'animals'},
{id:'cats', parent:'mammals'},
{id:'dogs', parent:'mammals'},
{id:'chihuahua', parent:'dogs'},
{id:'labrador', parent:'dogs'},
{id:'persian', parent:'cats'},
{id:'siamese', parent:'cats'},
]
//经典Abstract Factory
const abstractTreeNodePrototype = {
init(data) {
this.id = data.id;
this.children = [];
this.map = new Map();
this.map.set(this.id, this);
},
insert(item){
const node = Object.create(this);
node.init(item);
if(this.map.get(item.parent))
this.map.get(item.parent).append(node);
},
append(node){
node.parent = this;
this.children.push(node);
var current = this;
while(current) {
current.map.set(node.id, node);
current = current.parent;
}
},
fromItems(items) {
let root = null;
for(let item of items) {
if(item.parent != null)
root.insert(item);
else {
root = Object.create(this);
root.init(item);
}
}
return root;
}
};
const tree1NodePrototype = Object.create(abstractTreeNodePrototype)
tree1NodePrototype.fromItems(categories)
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