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1 package jimm.datavision.field;
2 import jimm.util.StringUtils;
3 import java.awt.FontMetrics  ;
4 import java.util.*;
5 import java.text.SimpleDateFormat ;
6 import java.text.DecimalFormat ;
7 import javax.swing.JLabel ;
8
9
17 class FormattedValueCache implements Observer {
18
19 protected static final double LINE_SIZE_FUDGE_FACTOR = 1.2;
20 protected static final HashMap decimalFormatters = new HashMap();
21 protected static final HashMap dateFormatters = new HashMap();
22 protected static JLabel wrappingCalculationsLabel;
23
24 protected Field field;
25 protected Object value;
26 protected String formatted;
27 protected double height;
28
29 FormattedValueCache(Field f) {
30 field = f;
31 if (field != null) {
32 field.addObserver(this);
33 if (field.getFormat() != null)
34 field.getFormat().addObserver(this);
35 }
36 }
37
38 protected void finalize() throws Throwable {
39 if (field != null) {
40 field.deleteObserver(this);
41 if (field.getFormat() != null)
42 field.getFormat().deleteObserver(this);
43 }
44 }
45
46
47 public void update(Observable o, Object arg) {
48 if (field != null && field.getFormat() != null)
49 value = null;
50 }
51
52 String getFormattedString(Object val) {
53 if (notSameAs(val)) {
54 value = val;
55 calcValues();
56 }
57 return formatted;
58 }
59
60 double getOutputHeight(Object val) {
61 if (notSameAs(val)) {
62 value = val;
63 calcValues();
64 }
65 return height;
66 }
67
68 protected boolean notSameAs(Object otherValue) {
69 if (value == null)
70 return otherValue != null;
71 else
72 return !value.equals(otherValue);
73 }
74
75
78 void calcValues() {
79 if (value == null) {
80 formatted = null;
81 height = 0;
82 return;
83 }
84
85 Format format = field.getFormat();
86 String fmtStr = format.getFormat();
87
88 if (value instanceof Number ) {
89 if (fmtStr == null) formatted = value.toString();
90 else formatted = getNumberFormatterFor(fmtStr).format((Number )value);
91 }
92 else if (value instanceof Date) {
93 if (fmtStr == null) formatted = value.toString();
94 else formatted = getDateFormatterFor(fmtStr).format((Date)value);
95 }
96 else {
97 formatted = value.toString();
98 if (format.isWrap()) {
99 FontMetrics fm =
100 getWrappingCalcsLabel().getFontMetrics(format.getFont());
101 formatted =
102 StringUtils.join(StringUtils.wrap(formatted, fm,
103 (int)field.getBounds().width),
104 "\n");
105 }
106 }
107
108 height = field.bounds.height;
110 if (formatted.length() != 0) {
111 List lines = StringUtils.splitIntoLines(formatted);
112 double h = lines.size() * format.getSize() * LINE_SIZE_FUDGE_FACTOR;
113 if (h > height)
114 height = h;
115 }
116 }
117
118 protected DecimalFormat getNumberFormatterFor(String formatString) {
119 DecimalFormat formatter =
120 (DecimalFormat )decimalFormatters.get(formatString);
121 if (formatter == null) {
122 formatter = new DecimalFormat (formatString);
123 decimalFormatters.put(formatString, formatter);
124 }
125 return formatter;
126 }
127
128 protected SimpleDateFormat getDateFormatterFor(String formatString) {
129 SimpleDateFormat formatter =
130 (SimpleDateFormat )dateFormatters.get(formatString);
131 if (formatter == null) {
132 formatter = new SimpleDateFormat (formatString);
133 dateFormatters.put(formatString, formatter);
134 }
135 return formatter;
136 }
137
138 protected static JLabel getWrappingCalcsLabel() {
139 if (wrappingCalculationsLabel == null) wrappingCalculationsLabel = new JLabel ();
141 return wrappingCalculationsLabel;
142 }
143 }
144 |
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