public class Employee
{
private string name;
private string address;
public Employee(string name, string address)
{
this.name = name;
this.address = address;
}
public string getName()
{
return name;
}
public string getAddress()
{
return address;
}
}
public interface Aggregate
{
Iterator iterator();
}
public interface Iterator
{
bool hasNext();
object next();
}
public class IteratorOffice : Iterator
{
private Office office;
private int cursor;
public IteratorOffice(Office office)
{
this.office = office;
this.cursor = 0;
}
public Office Office
{
get
{
throw new System.NotImplementedException();
}
set
{
}
}
public bool hasNext()
{
if(cursor < office.size())
{
return true;
}
else
{
return false;
}
}
public object next()
{
object employee = office.get(cursor);
cursor++;
return employee;
}
}
public class Office : Aggregate
{
private List<object> employees;
public Office(int max)
{
employees = new List<object>(max);
}
public IteratorOffice IteratorOffice
{
get
{
throw new System.NotImplementedException();
}
set
{
}
}
public Employee Employee
{
get
{
throw new System.NotImplementedException();
}
set
{
}
}
public void add(object obj)
{
employees.Add(obj);
}
public object get(int index)
{
return employees[index];
}
public int size()
{
return employees.Count;
}
public Iterator iterator()
{
return new IteratorOffice(this);
}
}
interface I
{
void M();
}
abstract class C: I
{
public abstract void M();
}
(MSDNより）
のように書けば書籍と同じようになるのだろう。今回は却下。（めんどい）
話しを戻します。上記プログラムを使う場合は
Office office = new Office(3);
office.add(new Employee("山田", "神奈川"));
office.add(new Employee("土田", "香川"));
office.add(new Employee("木田", "東京"));
Iterator iter = office.iterator();
string temp = "";
while (iter.hasNext())
{
Employee employee = (Employee)iter.next();
temp += employee.getName() + " : " + employee.getAddress() + "\n";
}
MessageBox.Show(temp);
のようにする。このプログラムでは最後にメッセージボックスに名簿リストが表示されます。
それでこのパターンを適用するとどうなるかというと
①Iteratorオブジェからの取得方法統一化。内部構造を考えず、常に決まった取り出しが可能
②集約オブジェの変更があってもIteratorオブジェを仲介するので取得側コード変更不要。
③Iteratorクラスのサブクラスを定義することで、様々な走査方法を実現できる。（＊1）
というメリットがあるそうです。
public class FileFilter implements FilenameFilter{
private final String FILTER_KEYWORD = ".jpg";
private final String FILTER_KEYWORD2 = ".JPG";
public boolean accept(File dir, String name){
File file = new File(name);
if(file.isDirectory()){
return false;
}
return(name.endsWith(FILTER_KEYWORD)|| name.endsWith(FILTER_KEYWORD2));
}
}
String[] imageArray;
File dir;
dir = new File("C:\とか");
imageArray = dir.list(new FileFilter());
public class CourtScheduler
{
private static CourtScheduler courtScheduler = new CourtScheduler();
private string[] schedule;
public static int HOURS = 24;
private CourtScheduler()
{
initialize();
}
public static CourtScheduler getInstance()
{
return courtScheduler;
}
private void initialize()
{
schedule = new string[24];
for (int i = 0; i < HOURS; i++)
schedule[i] = "";
}
public string getSchedule(int hour)
{
return schedule[hour];
}
public void setSchedule(int hour, string person)
{
schedule[hour] = person;
}
}
//クイックソート
private string[] quickSort(string[] filename, DateTime[] days, int left, int right)
{
Stack<int> lstack = new Stack<int>(right - left + 1);
Stack<int> rstack = new Stack<int>(right - left + 1);
string work;
DateTime work_time;
int end = right;
lstack.Push(left);
rstack.Push(right);
while (lstack.Count != 0)
{
int pl = left = lstack.Pop();
int pr = right = rstack.Pop();
DateTime pivot = days[(left + right) / 2];
do
{
while (pl <= right && days[pl].CompareTo(pivot) < 0) {pl++;}
while (pr >= 0 && days[pr].CompareTo(pivot) > 0) {pr--;}
if (pl <= pr)
{
work_time = days[pl];
work = filename[pl];
days[pl] = days[pr];
filename[pl] = filename[pr];
days[pr] = work_time;
filename[pr] = work;
pl++; pr--;
}
} while (pl <= pr);
if (left < pr)
{
lstack.Push(left);
rstack.Push(pr);
}
if (pl < right)
{
lstack.Push(pl);
rstack.Push(right);
}
}
return filename;
}
private String getDirectoryName(String absolutepath)
{
File file = new File(absolutepath);
int index = file.getAbsolutePath().lastIndexOf("\\");
String dirName = "";
if(index > 0 && index <= file.getAbsolutePath().length() - 1)
{
dirName = file.getAbsolutePath().substring(0, index);
}
return dirName;
}
void MainWindow::fileReName()
{
if(ui->listView->model() != NULL &&
ui->listView->selectionModel()->isSelected(ui->listView->currentIndex()))
{
QItemSelectionModel *temp;
temp = ui->listView->selectionModel();
QModelIndexList qModelIndexList = temp->selectedIndexes();
QModelIndex qMIndex = qModelIndexList[0];
QFile::rename(dirName + "/" + qMIndex.data(0).toString(),
dirName + "/fuck.txt");
//...以下は不必要なので省略
}
}
private void folderOpenDialog(ActionEvent arg0)
{
JFileChooser fldlg = new JFileChooser();
fldlg.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
if(fldlg.showOpenDialog(this) == JFileChooser.APPROVE_OPTION)
{
File fl = fldlg.getSelectedFile();
File[] txtFiles = fl.listFiles(getFileExtensionFilter(".txt"));
table.setValueAt(txtFiles[0], 0, 0);//テーブルにセットしてみる。
}
}
private FilenameFilter getFileExtensionFilter(String extension)
{
final String _extension = extension;
return new FilenameFilter()
{
public boolean accept(File file, String name)
{
boolean ret = name.endsWith(_extension);
return ret;
}
};
}