讀後感2

暑假在家待了8天,回來就不出意外的開始了我新的代碼生活,這個學期任務是文件管理和數據挖掘,據說挺有挑戰的哦,不過我喜歡,有難度才能學到更多東西嘛.

回家後基本上沒看什麼書,就在回家的火車上看了幾個設計模式以及設計模式沉思錄的第二章,參照着書上的內容,稍微寫了一點關於文件目錄管理的代碼,由於初學,就憑着這兩本書動手寫吧,自我感覺有點亂,以後再作調整吧.

package com.crazyj.Model;

import java.util.List;

public abstract class Node {
	
	private Node parent = null;
	
	private long size;
	private String name;
	
	public String getName() {
		return this.name;
	}

	public long getSize() {
		return size;
	}

	public void setSize(long size) {
		this.size = size;
	}

	public Node getParent() {
		return parent;
	}

	public void setParent(Node parent) {
		this.parent = parent;
	}
	
	public List<Node> getChild() {
		throw new UnsupportedOperationException("對象不支持此功能");
	}

	public abstract void printStruct(String preStr);
	
	public void addChild(Node child) {
		throw new UnsupportedOperationException("對象不支持此功能");
	}
	
	public void removeChild(Node child) {
		throw new UnsupportedOperationException("對象不支持此功能");
	}
	
	public Node getChild(int index) {
		throw new UnsupportedOperationException("對象不支持此功能");
	}
	
	public void Accept(Visitor v) {
		throw new UnsupportedOperationException("對象不支持此功能");
	}
	
	public static void destroy(Node node) {
		if (node.isWritable()) {
			//delete note;
		} else {
			System.err.println(node.getName() + " cannot be deleted.");
		}
	}
	
	protected boolean isWritable() {
		return false;
	}
	
	public void StreamOut() {
		
	}
}

package com.crazyj.Model;

public class File extends Node{
	
	private String name = "";
	
	public String getName() {
		return name;
	}
	
	public File(String name) {
		this.name = name;
	}
	
	public void printStruct(String preStr) {
		System.out.println(preStr + "-" + this.getName());
	}

	public void Accept(Visitor v) {
		v.visit(this);
	}
}

package com.crazyj.Model;

import java.util.ArrayList;
import java.util.List;

public class Directory extends Node {
	private List<Node> childNode = null;
	
	private String name = "";
	
	public String getName() {
		return name;
	}

	public Directory(String name) {
		this.name = name;
	}
	
	public long getSize() {
		
		long total = 0;
		Node child;
		
		for (int i = 0; getChild(i) != null; ++i) {
			child = getChild(i);
			total += child.getSize();
		}
		
		return total;
	}
	
	public void addChild(Node child) {
		if (childNode == null) {
			childNode = new ArrayList<Node>();
		}
		childNode.add(child);
		child.setParent(this);
	}
	
	public void removeChild(Node child) {
		if(childNode != null) {
			int idx = childNode.indexOf(child);
			
			if(idx != -1) {
				for(Node n : child.getChild()) {
					n.setParent(this);
					childNode.add(n);
				}
				
				childNode.remove(idx);
			}
		}
	}
	
	public List<Node> getChild() {
		return childNode;
	}
	
	public Node getChild(int index) {
		if (childNode != null) {
			if(index >=0 && index < childNode.size()) {
				return childNode.get(index);
			}
		}
		return null;
	}
	
	public void printStruct(String preStr) {
		System.out.println(preStr + "+" + this.getName());
		if(this.childNode != null) {
			preStr += " ";
			for(Node n : childNode) {
				n.printStruct(preStr);
			}
		}
	}
	
	public void Accept(Visitor v) {
		v.visit(this);
	}
}

package com.crazyj.Tools;

public class SubStr {
	
	public String SubPath(String path) {
		return path.substring(Head(path).length()+1);
		
	}
	
	public String Head(String path) {
		String[] names = path.split("/");
		return names[0];
	}
	
}

上一個工具類,用於mkdir的路徑的剪切

package com.crazyj.Model;

import com.crazyj.Tools.SubStr;

public class Client {
	
	SubStr ss = new SubStr();
	
	@SuppressWarnings("unused")
	public void mkdir(Directory current, String path) {
		String subPath = ss.SubPath(path);
		
		if (subPath.equals("")) {
			current.addChild(new Directory(path));
		} else {
			String name = ss.Head(path);
			
			Node node = Find(name, current);
			
			if (node != null) {
				Directory child =  (Directory) node;
				if(child != null) {
					mkdir(child, subPath);
				} else {
					System.err.println(child.getName() + " is not a directory.");
				}
			} else {
				System.err.println(name + " nonexistent.");
			}
		}
	}
	
	public Node Find(String name, Directory current) {
		for(Node child : current.getChild()) {
			if(name.equals(child.getName())) {
				return child;
			}
		}
		return null;
	}
	
	public void Ls(Node node) {
		SuffixPrinterVisitor spv = new SuffixPrinterVisitor();

		for(int i = 0; node.getChild(i) != null; ++i) {
			Node child = node.getChild(i);
			child.Accept(spv);
			System.out.println("");
		}
		
	}
	
	/*public void Cat (Node node) {
		Link l;
		
		if((File) node != null) {
			
		} else if ((Directory) node != null) {
			
		} else if (l == (Link) node) {
			Cat(l.getSubject());
		}
	}*/
}

package com.crazyj.Model;

public class Link extends Node{
	private Node subject;
	
	public Node getSubject() {
		return subject;
	}
	
	public Node getChild(int n) {
		return subject.getChild(n);
	}

	@Override
	public void printStruct(String preStr) {
		// TODO Auto-generated method stub
		System.out.println(preStr + "+" + this.getName());
	}
	
	public void Accept(Visitor v) {
		v.visit(this);
	}
	
}

package com.crazyj.Model;

public class Visitor {
	
	public void visit(File file) {
		
	}
	
	public void visit(Directory directory) {
		System.err.println("Can't cat a directory.");
	}
	
	public void visit(Link link) {
		link.getSubject().Accept(this);
	}
	
}

package com.crazyj.Model;

public class SuffixPrinterVisitor extends Visitor{
	
	public SuffixPrinterVisitor() {
		
	}
	
	public void visit(File file) {
		
	}
	
	public void visit(Directory directory) {
		System.out.println("/");
	}
	
	public void visit(Link link) {
		System.out.println("@");
	}
}

總體用到了composite,proxy,visitor,template method,由於現在只是先實現單用戶環境,singleton和mediator還沒有用上,漸漸完善漸漸學習吧,

由於streamIn和streamout兩個方法暫時沒有寫,老師讓我先看操作系統的文件管理和java的file類,這部分代碼先這樣吧,到時候再加上後續功能.如果有大神給我指點一二當然感激不盡.