PageStateManager


1   package com.tonbeller.jpivot.tags;
2   
3   import java.util.HashMap  ;
4   import java.util.Iterator  ;
5   import java.util.Map  ;
6   
7   /**
8    * @author av
9    * @since 15.02.2005
10   */
11  public class PageStateManager implements StateManager {
12    Map   map = new HashMap  ();
13    State current;
14    StateLogger logger = new Log4jStateLogger();
15  
16    void showCurrent() throws Exception   {
17      if (current != null) {
18        logger.show(current);
19        current.show();
20      }
21    }
22    
23    void hideCurrent() throws Exception   {
24      if (current != null) {
25        logger.hide(current);
26        current.hide();
27      }
28    }
29    
30    public void initializeAndShow(State next) throws Exception   {
31      hideCurrent();
32      
33      // remove state with same name from map
34      State prev = (State) map.get(next.getName());
35      if (prev != null) {
36        logger.destroy(prev);
37        prev.destroy();
38      }
39  
40      map.put(next.getName(), next);
41      logger.initialize(next);
42      next.initialize();
43      current = next;
44      showCurrent();
45    }
46  
47    /**
48     * makes the named state the visible one
49     */
50    public void showByName(String   name) throws Exception   {
51      State s = (State) map.get(name);
52      if (s == null) {
53        logger.error("could not find state for " + name);
54        return;
55      }
56      if (current != s) {
57        hideCurrent();
58        current = s;
59        showCurrent();
60      }
61    }
62  
63    /**
64     * removes and destroys all states
65     */
66    public void destroyAll() throws Exception   {
67      hideCurrent();
68      current = null;
69      for (Iterator   it = map.values().iterator(); it.hasNext();) {
70        State s = (State) it.next();
71        logger.destroy(s);
72        s.destroy();
73      }
74      map.clear();
75    }
76  
77    /**
78     * removes and destroys the named state
79     */
80    public void destroyByName(String   name) throws Exception   {
81      State s = (State) map.get(name);
82      if (s == null) {
83        logger.error("query " + name + " not found");
84        return;
85      }
86      if (s == current) {
87        hideCurrent();
88        current = null;
89      }
90      logger.destroy(s);
91      s.destroy();
92      map.remove(name);
93    }
94  
95    public StateLogger getLogger() {
96      return logger;
97    }
98  
99    public void setLogger(StateLogger logger) {
100     this.logger = logger;
101   }
102 
103 }
104
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