CSharp: Iterator Pattern
/// <summary>
/// A simple file handlng class
/// Iterator Patterns 迭代器模式
/// 20220918
/// geovindu,Geovin Du,涂聚文
/// </summary>
public class csFile
{
/// <summary>
///
/// </summary>
private string fileName;
/// <summary>
///
/// </summary>
StreamReader ts;
/// <summary>
///
/// </summary>
StreamWriter ws;
/// <summary>
///
/// </summary>
private bool opened, writeOpened;
/// <summary>
///
/// </summary>
public csFile()
{
init();
}
/// <summary>
///
/// </summary>
private void init()
{
opened = false;
writeOpened = false;
}
/// <summary>
///
/// </summary>
/// <param name="file_name"></param>
public csFile(string file_name)
{
fileName = file_name;
init();
}
/// <summary>
///
/// </summary>
/// <param name="file_name"></param>
/// <returns></returns>
public bool OpenForRead(string file_name)
{
fileName = file_name;
try
{
ts = new StreamReader(fileName);
opened = true;
}
catch (FileNotFoundException)
{
return false;
}
return true;
}
/// <summary>
///
/// </summary>
/// <returns></returns>
public bool OpenForRead()
{
return OpenForRead(fileName);
}
/// <summary>
///
/// </summary>
/// <returns></returns>
public string readLine()
{
return ts.ReadLine();
}
/// <summary>
///
/// </summary>
/// <param name="s"></param>
public void writeLine(string s)
{
ws.WriteLine(s);
}
/// <summary>
///
/// </summary>
public void close()
{
if (opened)
ts.Close();
if (writeOpened)
ws.Close();
}
/// <summary>
///
/// </summary>
/// <returns></returns>
public bool OpenForWrite()
{
return OpenForWrite(fileName);
}
/// <summary>
///
/// </summary>
/// <param name="file_name"></param>
/// <returns></returns>
public bool OpenForWrite(string file_name)
{
try
{
ws = new StreamWriter(file_name);
fileName = file_name;
writeOpened = true;
return true;
}
catch (FileNotFoundException)
{
return false;
}
}
}
/// <summary>
/// String Tokenizer class
/// Iterator Patterns 迭代器模式
/// 20220918
/// geovindu,Geovin Du,涂聚文
/// </summary>
public class StringTokenizer
{
/// <summary>
///
/// </summary>
private string data, delimiter;
/// <summary>
///
/// </summary>
private string[] tokens;
/// <summary>
///
/// </summary>
private int index;
/// <summary>
///
/// </summary>
/// <param name="dataLine"></param>
public StringTokenizer(string dataLine)
{
init(dataLine, " ");
}
/// <summary>
///
/// </summary>
/// <param name="dataLine"></param>
/// <param name="delim"></param>
private void init(String dataLine, string delim)
{
delimiter = delim;
data = dataLine;
tokens = data.Split(delimiter.ToCharArray());
index = 0;
}
/// <summary>
///
/// </summary>
/// <param name="dataLine"></param>
/// <param name="delim"></param>
public StringTokenizer(string dataLine, string delim)
{
init(dataLine, delim);
}
/// <summary>
///
/// </summary>
/// <returns></returns>
public bool hasMoreElements()
{
return (index < (tokens.Length));
}
/// <summary>
///
/// </summary>
/// <returns></returns>
public string nextToken()
{
return nextElement();
}
/// <summary>
///
/// </summary>
/// <returns></returns>
public string nextElement()
{
string s = tokens[index++];
while ((s.Length <= 0) && (index < tokens.Length))
s = tokens[index++];
return s;
}
}
/// <summary>
/// Summary description for KidIterator.
/// Iterator Patterns 迭代器模式
/// 20220918
/// geovindu,Geovin Du,涂聚文
/// </summary>
public class FilteredIterator : IEnumerator
{
private ArrayList kids;
private int index;
private string club;
/// <summary>
///
/// </summary>
/// <param name="kidz"></param>
/// <param name="club"></param>
public FilteredIterator(ArrayList kidz, string club)
{
kids = kidz;
index = 0;
this.club = club;
}
/// <summary>
///
/// </summary>
/// <returns></returns>
public bool MoveNext()
{
bool more = index < kids.Count - 1;
if (more)
{
Kid kd = (Kid)kids[++index];
more = index < kids.Count;
while (more && !kd.getClub().Equals(club))
{
kd = (Kid)kids[index++];
more = index < kids.Count;
}
}
return more;
}
/// <summary>
///
/// </summary>
public object Current
{
get
{
return kids[index];
}
}
/// <summary>
///
/// </summary>
public void Reset()
{
index = 0;
}
}
/// <summary>
/// Summary description for Kid.
/// Iterator Patterns 迭代器模式
/// 20220918
/// geovindu,Geovin Du,涂聚文
/// </summary>
public class Kid
{
private string frname, lname, club;
private int age;
private float time;
private Hashtable hash;
/// <summary>
///
/// </summary>
/// <param name="line"></param>
public Kid(string line) {
hash = new Hashtable ();
StringTokenizer tok = new StringTokenizer (line);
string lnum = tok.nextToken ();
frname = tok.nextToken ();
//hash.Add (ParseVar.FRNAME , frname);
lname = tok.nextToken ();
//hash.Add (ParseVar.LNAME , lname);
age = Convert.ToInt32 ( tok.nextToken ());
//hash.Add (ParseVar.AGE , age);
club = tok.nextToken ();
//hash.Add (ParseVar.CLUB , club);
time = Convert.ToSingle (tok.nextToken ());
//hash.Add (ParseVar.TIME , time);
}
/// <summary>
///
/// </summary>
/// <param name="key"></param>
/// <returns></returns>
public object getData(int key) {
return hash[key];
}
/// <summary>
///
/// </summary>
/// <param name="kd"></param>
/// <param name="key"></param>
/// <returns></returns>
public bool compare(Kid kd, int key) {
return compareTo(getData(key) , kd.getData (key));
}
/// <summary>
///
/// </summary>
/// <param name="o1"></param>
/// <param name="o2"></param>
/// <returns></returns>
private bool compareTo(object o1, object o2) {
if (o1.GetType().Name.Equals ("String") )
return compare_To((string)o1, (string) o2);
else
return compare_To((float)o1, (float)o2);
}
/// <summary>
///
/// </summary>
/// <param name="s1"></param>
/// <param name="s2"></param>
/// <returns></returns>
private bool compare_To(String s1, String s2) {
return s1.CompareTo (s2) >0;
}
/// <summary>
///
/// </summary>
/// <param name="k1"></param>
/// <param name="k2"></param>
/// <returns></returns>
private bool compare_To(int k1, int k2){
return k1 > k2;
}
/// <summary>
/// /
/// </summary>
/// <param name="f1"></param>
/// <param name="f2"></param>
/// <returns></returns>
private bool compare_To(float f1, float f2) {
return f1 > f2;
}
/// <summary>
/// /
/// </summary>
/// <returns></returns>
public string getFrname() {
return frname;
}
/// <summary>
/// /
/// </summary>
/// <returns></returns>
public string getLname() {
return lname;
}
/// <summary>
///
/// </summary>
/// <returns></returns>
public int getAge() {
return age;
}
/// <summary>
///
/// </summary>
/// <returns></returns>
public string getClub() {
return club;
}
}
/// <summary>
/// Summary description for KidData.
/// Iterator Patterns 迭代器模式
/// 20220918
/// geovindu,Geovin Du,涂聚文
/// </summary>
public class KidData : IEnumerator
{
private ArrayList kids;
private int index;
private Hashtable clubs;
/// <summary>
///
/// </summary>
/// <param name="filename"></param>
public KidData(string filename)
{
kids = new ArrayList();
clubs = new Hashtable();
csFile fl = new csFile(filename);
fl.OpenForRead();
string line = fl.readLine();
while (line != null)
{
Kid kd = new Kid(line);
string club = kd.getClub();
if (!clubs.Contains(club))
{
clubs.Add(club, club);
}
kids.Add(kd);
line = fl.readLine();
}
fl.close();
index = 0;
}
/// <summary>
///
/// </summary>
/// <returns></returns>
public IDictionaryEnumerator getClubs()
{
return clubs.GetEnumerator();
}
/// <summary>
///
/// </summary>
/// <returns></returns>
public bool MoveNext()
{
index++;
return index < kids.Count;
}
/// <summary>
///
/// </summary>
public object Current
{
get
{
return kids[index];
}
}
/// <summary>
///
/// </summary>
public void Reset()
{
index = 0;
}
/// <summary>
///
/// </summary>
/// <returns></returns>
public Kid[] getData()
{
Kid[] kds = new Kid[kids.Count];
for (int i = 0; i < kids.Count; i++)
{
kds[i] = (Kid)kids[i];
}
return kds;
}
/// <summary>
///
/// </summary>
/// <returns></returns>
public int size()
{
return kids.Count;
}
/// <summary>
///
/// </summary>
/// <param name="i"></param>
/// <returns></returns>
public Kid getKid(int i)
{
if (i >= 0 && i < kids.Count)
return (Kid)kids[i];
else
return null;
}
/// <summary>
///
/// </summary>
/// <returns></returns>
public KidIterator getIterator()
{
return new KidIterator(kids);
}
/// <summary>
///
/// </summary>
/// <param name="club"></param>
/// <returns></returns>
public FilteredIterator getFilteredIterator(string club)
{
return new FilteredIterator(kids, club);
}
}
/// <summary>
/// Summary description for KidIterator.
/// Iterator Patterns 迭代器模式
/// 20220918
/// geovindu,Geovin Du,涂聚文
/// </summary>
public class KidIterator : IEnumerator
{
private ArrayList kids;
private int index;
/// <summary>
///
/// </summary>
/// <param name="kidz"></param>
public KidIterator(ArrayList kidz)
{
kids = kidz;
index = 0;
}
/// <summary>
///
/// </summary>
/// <returns></returns>
public bool MoveNext()
{
index++;
return index < kids.Count;
}
/// <summary>
///
/// </summary>
public object Current
{
get
{
return kids[index];
}
}
/// <summary>
///
/// </summary>
public void Reset()
{
index = 0;
}
}
调用：、
/// <summary>
/// Iterator Patterns 迭代器模式
/// 20220918
/// geovindu,Geovin Du,涂聚文
/// </summary>
public partial class IteratorPatternsForm : Form
{
/// <summary>
///
/// </summary>
private KidData kdata;
/// <summary>
///
/// </summary>
private void init()
{
kdata = new KidData("50free.txt");
KidIterator kiter = kdata.getIterator();
while (kiter.MoveNext())
{
Kid kd = (Kid)kiter.Current;
lsKids.Items.Add(kd.getFrname() + " " + kd.getLname());
}
IDictionaryEnumerator clubiter = kdata.getClubs();
while (clubiter.MoveNext())
{
cbClubs.Items.Add((string)clubiter.Value);
}
}
/// <summary>
///
/// </summary>
public IteratorPatternsForm()
{
InitializeComponent();
init();
}
/// <summary>
///
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void IteratorPatternsForm_Load(object sender, EventArgs e)
{
}
/// <summary>
///
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void lsClubKids_SelectedIndexChanged(object sender, EventArgs e)
{
}
/// <summary>
///
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void cbClubs_SelectedIndexChanged(object sender, EventArgs e)
{
string club = (String)cbClubs.SelectedItem;
FilteredIterator iter = kdata.getFilteredIterator(club);
lsClubKids.Items.Clear();
while (iter.MoveNext())
{
Kid kd = (Kid)iter.Current;
lsClubKids.Items.Add(kd.getFrname() + " " + kd.getLname());
}
}
输出：
哲学管理(学)人生, 文学艺术生活, 自动(计算机学)物理(学)工作, 生物(学)化学逆境, 历史(学)测绘(学)时间, 经济(学)数学金钱(理财), 心理(学)医学情绪, 诗词美容情感, 美学建筑(学)家园, 解构建构(分析)整合学习, 智商情商(IQ、EQ)运筹(学)生存.---Geovin Du(涂聚文）
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