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1
13 package com.tonbeller.wcf.selection;
14
15 import java.util.Collection  ;
16 import java.util.Iterator ;
17 import java.util.Set ;
18
19 import com.tonbeller.wcf.controller.RequestContext;
20
21
26 public abstract class AbstractSelectionModel implements SelectionModel {
27 private int mode;
28 private SelectionChangeSupport changeSupport;
29
30 public abstract Set getSelection();
31 public abstract void add(Object obj);
32 public abstract void remove(Object obj);
33 public abstract void clear();
34
35 protected AbstractSelectionModel(int mode) {
36 this.mode = mode;
37 changeSupport = new SelectionChangeSupport(this);
38 }
39
40 public int getMode() {
41 return mode;
42 }
43
44 public void setMode(int mode) {
45 this.mode = mode;
46 }
47
48
49 public void addAll(Collection c) {
50 for (Iterator it = c.iterator(); it.hasNext();)
51 add(it.next());
52 }
53
54 public boolean contains(Object obj) {
55 return getSelection().contains(obj);
56 }
57
58 public Object getSingleSelection() {
59 Set selection = getSelection();
60 if (selection.size() == 0)
61 return null;
62 if (selection.size() == 1)
63 return selection.iterator().next();
64 throw new IllegalStateException ("single selection contains " + selection.size() + " elements");
65 }
66
67 public void setSingleSelection(Object obj) {
68 clear();
69 add(obj);
70 }
71
72 public boolean isEmpty() {
73 return getSelection().isEmpty();
74 }
75
76
80 public boolean isSelectable(Object item) {
81 if (item instanceof Unselectable)
82 return false;
83 return true;
84 }
85
86 public void fireSelectionChanged(RequestContext context) {
87 changeSupport.fireSelectionChanged(context);
88 }
89
90 public void addSelectionListener(SelectionChangeListener l) {
91 changeSupport.addSelectionListener(l);
92 }
93
94 public void removeSelectionListener(SelectionChangeListener l) {
95 changeSupport.removeSelectionListener(l);
96 }
97
98 }
99 |
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