code in blog.sheimi.me: 2012-06-20-software-architecture-review-4 (2)

Proxy.java

import java.util.*;

public class Proxy {
  public static void main(String[] args) {
  }
}

class ThreeD<T, V, W> {

  private T t;
  private V v;
  private W w;

  public ThreeD(T t, V v, W w) {
    this.t = t;
    this.v = v;
    this.w = w;
  }

  public T getA() { return t;}
  public V getB() { return v;}
  public W getC() { return w;}
}

interface IDataList<T, V, W> {
  public T getA(int i) throws Exception;
  public V getB(int i) throws Exception;
  public W getC(int i) throws Exception;
  public int size();
}

abstract class DataListProxy<T, V, W> implements IDataList<T, V, W> {
  protected IDataList<T, V, W> real;
  public DataListProxy(IDataList<T, V, W> real) {this.real = real;}
  public T getA(int i) throws Exception {throw new Exception(); }
  public V getB(int i) throws Exception {throw new Exception(); }
  public W getC(int i) throws Exception {throw new Exception(); }
  public int size() { return real.size(); }
}


class DataListProxyA<T, V, W> extends DataListProxy<T, V, W> {
  public DataListProxyA(IDataList<T, V, W> real) {super(real);}
  public T getA(int i) throws Exception {return real.getA(i); }
}

class DataListProxyB<T, V, W> extends DataListProxy<T, V, W> {
  public DataListProxyB(IDataList<T, V, W> real) {super(real);}
  public V getB(int i) throws Exception {return real.getB(i); }
}

class DataListProxyC<T, V, W> extends DataListProxy<T, V, W> {
  public DataListProxyC(IDataList<T, V, W> real) {super(real);}
  public W getC(int i) throws Exception {return real.getC(i); }
}

class DataList<T, V, W> implements IDataList<T, V, W> {

  private ArrayList<ThreeD<T, V, W>> list = new ArrayList<ThreeD<T, V, W>>();

  public void add(ThreeD<T, V, W> d) { list.add(d); }
  public ThreeD<T, V, W> get(int index) { return list.get(index); }
  public int size() {return list.size();}
  public T getA(int i) { return list.get(i).getA(); }
  public V getB(int i) { return list.get(i).getB(); }
  public W getC(int i) { return list.get(i).getC(); }
}