path.java

NAS文件器的模拟

package file;

public class Path {
	private String name;
	private Path tail;
	
	public Path (String n) {
		name = n;
		tail = null;
	}
	
	public Path (String n, Path t) {
		name = n;
		tail = t;
	}
	
	public String getName() {
		return name;
	}
	
	public Path getTail() {
		return tail;
	}
	
	public Path addPath (String n) {
		this.do_addPath(n);
		return this;
	}
	
	private void do_addPath(String n){
		if (this.tail == null) {
			this.tail = new Path(n);
		}
		else {
			this.tail.addPath(n);
		}
	}
	
	public Path upperPath() {
		this.do_upperPath();
		return this;
	}
	
	private void do_upperPath (){
		if (this.tail.tail == null) {
			this.tail = null;
		}
		else {
			this.tail.upperPath();
		}
	}
	
	public String getLastName () {
		if (this.tail == null) {
			return this.name;
		}
		else {
			return this.tail.getLastName();
		}
	}
	
	public String toString () {
		String pathName = "/";
		for (Path p = this; p!= null; p = p.tail) {
			pathName = pathName.concat(p.name);
			pathName = pathName.concat("/");
		}
		return pathName;
	}
}