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1
7
8 package org.jdesktop.swing.data;
9
10 import org.jdesktop.swing.data.MetaData;
11 import org.jdesktop.swing.data.Validator;
12
13 import java.util.ArrayList  ;
14 import java.util.HashMap ;
15 import java.util.List ;
16
17
26 public abstract class AbstractDataModel implements DataModel {
27
28 protected ArrayList validators;
29 private ArrayList valueChangeListeners;
30 private HashMap valueChangeEvents;
31
32 public abstract String [] getFieldNames();
33
34 public MetaData[] getMetaData() {
35 String fieldNames[] = getFieldNames();
36 MetaData metaData[] = new MetaData[fieldNames.length];
37 for(int i = 0; i < fieldNames.length; i++) {
38 metaData[i] = getMetaData(fieldNames[i]);
39 }
40 return metaData;
41 }
42
43 public abstract MetaData getMetaData(String fieldName);
44
45 public abstract Object getValue(String fieldName);
46
47 public void setValue(String fieldName, Object value) {
48 Object oldValue = getValue(fieldName);
49 setValueImpl(fieldName, value);
50 if ((oldValue != null && !oldValue.equals(value)) ||
51 (oldValue == null && value != null)) {
52 fireValueChanged(fieldName);
53 }
54 }
55
56 protected abstract void setValueImpl(String fieldName, Object value);
57
58 public void addValidator(Validator validator) {
59 if (validators == null) {
60 validators = new ArrayList ();
61 }
62 validators.add(validator);
63
64 }
65 public void removeValidator(Validator validator) {
66 if (validators != null) {
67 validators.remove(validator);
68 }
69 }
70 public Validator[] getValidators() {
71 if (validators != null) {
72 return (Validator[]) validators.toArray(new Validator[validators.size()]);
73 }
74 return new Validator[0];
75 }
76
77 public void addValueChangeListener(ValueChangeListener l) {
78 if (valueChangeListeners == null) {
79 valueChangeListeners = new ArrayList ();
80 }
81 valueChangeListeners.add(l);
82 }
83
84 public void removeValueChangeListener(ValueChangeListener l) {
85 if (valueChangeListeners != null){
86 valueChangeListeners.remove(l);
87 }
88 }
89
90 public ValueChangeListener[] getValueChangeListeners() {
91 if (valueChangeListeners != null) {
92 return (ValueChangeListener[])valueChangeListeners.toArray(new ValueChangeListener[1]);
93 }
94 return new ValueChangeListener[0];
95 }
96
97 protected void fireValueChanged(String fieldName) {
98 ValueChangeListener[] formListeners = getValueChangeListeners();
99 ValueChangeEvent e = getCachedEvent(fieldName);
100 if (valueChangeListeners != null) {
101 for (int i = 0; i < valueChangeListeners.size(); i++) {
102 ValueChangeListener vcl = (ValueChangeListener)
103 valueChangeListeners.get(i);
104 vcl.valueChanged(e);
105 }
106 }
107 }
108
109 private ValueChangeEvent getCachedEvent(String fieldName) {
110 if (valueChangeEvents == null) {
111 valueChangeEvents = new HashMap ();
112 }
113 ValueChangeEvent event = (ValueChangeEvent)valueChangeEvents.get(fieldName);
114 if (event == null) {
115 event = new ValueChangeEvent(this, fieldName);
116 valueChangeEvents.put(fieldName, event);
117 }
118 return event;
119 }
120
121
122 }
123 |
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