t2olist.java

一套MMORPG手机网络游戏的服务端

package com.swing.game.crystal.utils;

import java.util.*;

/**
 *
 * <p>Title: Two key to one value mapping list</p>
 * <p>Description: If you want to map one value to two key, you should use this list,
 *                 you can not insert triple of which one of its key has already been
 *                 in this list.
 * </p>
 * <p>Copyright: Copyright (c) 2004</p>
 * <p>Company: </p>
 * @author vampire
 * @version 1.0
 */
public class T2OList {

  private Map data = new HashMap();
  private Map keyMapping = new HashMap();

  public T2OList() {
  }

  public boolean put(Object key1, Object key2, Object o) {

    if (this.keyMapping.containsKey(key1)) {
      String value = (String)this.keyMapping.get(key1);
      // there has been the two key mapping to a value in list, just replace the value with the new value
      if (value.equals(key2)) {
        this.data.put(key1, o);
        return true;
      }
      else
        return false;
    }
    else if (this.keyMapping.containsKey(key2)) {
      String value = (String)this.keyMapping.get(key2);
      // there has been the two key mapping to a value in list, just replace the value with the new value
      if (value.equals(key1)) {
        this.data.put(key1, o);
        return true;
      }
      return false;
    }
    else {
      this.data.put(key1, o);
      this.keyMapping.put(key1, key2);
      return true;
    }
  }

  public Object get(Object key) {
    Object o = null;
    if (this.data.containsKey(key))
      o = this.data.get(key);
    else {
      Object k = null;
      if (this.keyMapping.containsKey(key)) {
        k = this.keyMapping.get(key);
        if (this.data.containsKey(k))
          o = this.data.get(k);
      }
      else if (this.keyMapping.containsValue(key)) {
        for (Iterator iter = this.keyMapping.keySet().iterator(); iter.hasNext(); ) {
          k = iter.next();
          if (this.keyMapping.get(k).equals(key))
            break;
        }
        o = this.data.get(k);
      }
    }
    return o;
  }

  public Object remove(Object key) {
    Object o = null;
    if (this.data.containsKey(key))
      o = this.data.remove(key);
    else {
      Object k = null;
      if (this.keyMapping.containsKey(key)) {
        k = this.keyMapping.get(key);
        if (this.data.containsKey(k))
          o = this.data.remove(k);
      }
      else if (this.keyMapping.containsValue(key)) {
        for (Iterator iter = this.keyMapping.keySet().iterator(); iter.hasNext(); ) {
          k = iter.next();
          if (this.keyMapping.get(k).equals(key))
            break;
        }
        o = this.data.remove(k);
      }
    }
    return o;
  }

  public boolean containsKey(Object key) {
    if (this.keyMapping.containsKey(key))
      return true;
    else if (this.keyMapping.containsValue(key))
      return true;
    else
      return false;
  }

  public boolean containsValue(Object value) {
    if (this.data.containsValue(value))
      return true;
    else
      return false;
  }

  public int size() {
    return this.data.size();
  }

  public Iterator values() {
    return this.data.values().iterator();
  }

  public Iterator keys() {
    List l = new ArrayList();
    Object key = null;
    for (Iterator iter = this.keyMapping.keySet().iterator(); iter.hasNext(); ) {
      key = iter.next();
      l.add(key);
      l.add(this.keyMapping.get(key));
    }
    return l.iterator();
  }

}