/* * To change this template, choose Tools | Templates * and open the template in the editor. */package biz.tbuy.huliqing.jloading.downloader;/** * * @author huliqing */public class Piece {    private long start;  // 起始點的指針位置    private long pos;    // 當前完成度所在的指針位置    private long end;    // 終結點的指針位置        public Piece(long start, long pos, long end) {        this.start = start;        this.pos = pos;        this.end = end;    }    public synchronized long getEnd() {        return end;    }    public synchronized void setEnd(long end) {        this.end = end;    }    public synchronized long getPos() {        return pos;    }    public synchronized void setPos(long pos) {        this.pos = pos;    }    public synchronized long getStart() {        return start;    }    public synchronized void setStart(long start) {        this.start = start;    }        /**     * 切割出一塊新的區域     * @return     */    public synchronized Piece cutPiece() {        // 如果當前區塊還有大于xK的數據未下載完，則允許切割出分塊        long toCut = end - pos;        if (toCut > (1024 * 10)) {            long s; // 起點            long e; // 終點            s = (long) (pos + Math.ceil(toCut / 2));            e = end;            end = s - 1;            Piece piece = new Piece(s, s, e);            return piece;        }        return null;    }}