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1
52
53 package freemarker.core;
54
55 import java.io.IOException  ;
56 import java.text.NumberFormat ;
57 import java.util.Locale ;
58 import freemarker.template.*;
59
60
64 final class NumericalOutput extends TemplateElement {
65
66 private final Expression expression;
67 private final boolean hasFormat;
68 private final int minFracDigits;
69 private final int maxFracDigits;
70 private volatile FormatHolder formatCache;
72 NumericalOutput(Expression expression) {
73 this.expression = expression;
74 hasFormat = false;
75 this.minFracDigits = 0;
76 this.maxFracDigits = 0;
77 }
78
79 NumericalOutput(Expression expression,
80 int minFracDigits,
81 int maxFracDigits)
82 {
83 this.expression = expression;
84 hasFormat = true;
85 this.minFracDigits = minFracDigits;
86 this.maxFracDigits = maxFracDigits;
87 }
88
89 void accept(Environment env) throws TemplateException, IOException
90 {
91 Number num = EvaluationUtil.getNumber(expression, env);
92
93 FormatHolder fmth = formatCache; if (fmth == null || !fmth.locale.equals(env.getLocale())) {
95 synchronized(this) {
96 fmth = formatCache;
97 if (fmth == null || !fmth.locale.equals(env.getLocale())) {
98 NumberFormat fmt = NumberFormat.getNumberInstance(env.getLocale());
99 if (hasFormat) {
100 fmt.setMinimumFractionDigits(minFracDigits);
101 fmt.setMaximumFractionDigits(maxFracDigits);
102 } else {
103 fmt.setMinimumFractionDigits(0);
104 fmt.setMaximumFractionDigits(50);
105 }
106 fmt.setGroupingUsed(false);
107 formatCache = new FormatHolder(fmt, env.getLocale());
108 fmth = formatCache;
109 }
110 }
111 }
112 env.getOut().write(fmth.format.format(num));
116 }
117
118 public String getCanonicalForm() {
119 StringBuffer buf = new StringBuffer ("#{");
120 buf.append(expression.getCanonicalForm());
121 if (hasFormat) {
122 buf.append(" ; ");
123 buf.append("m");
124 buf.append(minFracDigits);
125 buf.append("M");
126 buf.append(maxFracDigits);
127 }
128 buf.append("}");
129 return buf.toString();
130 }
131
132 public String getDescription() {
133 return getSource();
134 }
135
136 boolean heedsOpeningWhitespace() {
137 return true;
138 }
139
140 boolean heedsTrailingWhitespace() {
141 return true;
142 }
143
144 private class FormatHolder {
145 final NumberFormat format;
146 final Locale locale;
147
148 FormatHolder(NumberFormat format, Locale locale) {
149 this.format = format;
150 this.locale = locale;
151 }
152 }
153 }
154 |
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