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1
16
17 package org.apache.taglibs.standard.tag.common.fmt;
18
19 import java.io.IOException  ;
20 import java.lang.reflect.Method ;
21 import java.text.DecimalFormat ;
22 import java.text.DecimalFormatSymbols ;
23 import java.text.NumberFormat ;
24 import java.util.Locale ;
25
26 import javax.servlet.jsp.JspException ;
27 import javax.servlet.jsp.JspTagException ;
28 import javax.servlet.jsp.PageContext ;
29 import javax.servlet.jsp.tagext.BodyTagSupport ;
30
31 import org.apache.taglibs.standard.resources.Resources;
32 import org.apache.taglibs.standard.tag.common.core.Util;
33
34
40
41 public abstract class FormatNumberSupport extends BodyTagSupport {
42
43
46 private static final Class [] GET_INSTANCE_PARAM_TYPES =
47 new Class [] { String .class };
48 private static final String NUMBER = "number";
49 private static final String CURRENCY = "currency";
50 private static final String PERCENT = "percent";
51
52
53
56 protected Object value; protected boolean valueSpecified; protected String type; protected String pattern; protected String currencyCode; protected String currencySymbol; protected boolean isGroupingUsed; protected boolean groupingUsedSpecified;
64 protected int maxIntegerDigits; protected boolean maxIntegerDigitsSpecified;
66 protected int minIntegerDigits; protected boolean minIntegerDigitsSpecified;
68 protected int maxFractionDigits; protected boolean maxFractionDigitsSpecified;
70 protected int minFractionDigits; protected boolean minFractionDigitsSpecified;
72
73
74
77 private String var; private int scope; private static Class currencyClass;
80
81
82
85 static {
86 try {
87 currencyClass = Class.forName("java.util.Currency");
88 } catch (Exception cnfe) {
90 }
91 }
92
93 public FormatNumberSupport() {
94 super();
95 init();
96 }
97
98 private void init() {
99 value = type = null;
100 valueSpecified = false;
101 pattern = var = currencyCode = currencySymbol = null;
102 groupingUsedSpecified = false;
103 maxIntegerDigitsSpecified = minIntegerDigitsSpecified = false;
104 maxFractionDigitsSpecified = minFractionDigitsSpecified = false;
105 scope = PageContext.PAGE_SCOPE;
106 }
107
108
109
112 public void setVar(String var) {
113 this.var = var;
114 }
115
116 public void setScope(String scope) {
117 this.scope = Util.getScope(scope);
118 }
119
120
121
124 public int doEndTag() throws JspException {
125 String formatted = null;
126 Object input = null;
127
128 if (valueSpecified) {
130 input = value;
132 } else {
133 if (bodyContent != null && bodyContent.getString() != null)
135 input = bodyContent.getString().trim();
136 }
137
138 if ((input == null) || input.equals("")) {
139 if (var != null) {
143 pageContext.removeAttribute(var, scope);
144 }
145 return EVAL_PAGE;
146 }
147
148
152 if (input instanceof String ) {
153 try {
154 if (((String ) input).indexOf('.') != -1) {
155 input = Double.valueOf((String ) input);
156 } else {
157 input = Long.valueOf((String ) input);
158 }
159 } catch (NumberFormatException nfe) {
160 throw new JspException (
161 Resources.getMessage("FORMAT_NUMBER_PARSE_ERROR", input),
162 nfe);
163 }
164 }
165
166 Locale loc = SetLocaleSupport.getFormattingLocale(
168 pageContext,
169 this,
170 true,
171 NumberFormat.getAvailableLocales());
172
173 if (loc != null) {
174 NumberFormat formatter = null;
176 if ((pattern != null) && !pattern.equals("")) {
177 DecimalFormatSymbols symbols = new DecimalFormatSymbols (loc);
179 formatter = new DecimalFormat (pattern, symbols);
180 } else {
181 formatter = createFormatter(loc);
182 }
183 if (((pattern != null) && !pattern.equals(""))
184 || CURRENCY.equalsIgnoreCase(type)) {
185 try {
186 setCurrency(formatter);
187 } catch (Exception e) {
188 throw new JspException (
189 Resources.getMessage("FORMAT_NUMBER_CURRENCY_ERROR"),
190 e);
191 }
192 }
193 configureFormatter(formatter);
194 formatted = formatter.format(input);
195 } else {
196 formatted = input.toString();
198 }
199
200 if (var != null) {
201 pageContext.setAttribute(var, formatted, scope);
202 } else {
203 try {
204 pageContext.getOut().print(formatted);
205 } catch (IOException ioe) {
206 throw new JspTagException (ioe.toString(), ioe);
207 }
208 }
209
210 return EVAL_PAGE;
211 }
212
213 public void release() {
215 init();
216 }
217
218
219
222 private NumberFormat createFormatter(Locale loc) throws JspException {
223 NumberFormat formatter = null;
224
225 if ((type == null) || NUMBER.equalsIgnoreCase(type)) {
226 formatter = NumberFormat.getNumberInstance(loc);
227 } else if (CURRENCY.equalsIgnoreCase(type)) {
228 formatter = NumberFormat.getCurrencyInstance(loc);
229 } else if (PERCENT.equalsIgnoreCase(type)) {
230 formatter = NumberFormat.getPercentInstance(loc);
231 } else {
232 throw new JspException (
233 Resources.getMessage("FORMAT_NUMBER_INVALID_TYPE", type));
234 }
235
236 return formatter;
237 }
238
239
244 private void configureFormatter(NumberFormat formatter) {
245 if (groupingUsedSpecified)
246 formatter.setGroupingUsed(isGroupingUsed);
247 if (maxIntegerDigitsSpecified)
248 formatter.setMaximumIntegerDigits(maxIntegerDigits);
249 if (minIntegerDigitsSpecified)
250 formatter.setMinimumIntegerDigits(minIntegerDigits);
251 if (maxFractionDigitsSpecified)
252 formatter.setMaximumFractionDigits(maxFractionDigits);
253 if (minFractionDigitsSpecified)
254 formatter.setMinimumFractionDigits(minFractionDigits);
255 }
256
257
285 private void setCurrency(NumberFormat formatter) throws Exception {
286 String code = null;
287 String symbol = null;
288
289 if ((currencyCode == null) && (currencySymbol == null)) {
290 return;
291 }
292
293 if ((currencyCode != null) && (currencySymbol != null)) {
294 if (currencyClass != null)
295 code = currencyCode;
296 else
297 symbol = currencySymbol;
298 } else if (currencyCode == null) {
299 symbol = currencySymbol;
300 } else {
301 if (currencyClass != null)
302 code = currencyCode;
303 else
304 symbol = currencyCode;
305 }
306
307 if (code != null) {
308 Object [] methodArgs = new Object [1];
309
310
313 Method m = currencyClass.getMethod("getInstance",
314 GET_INSTANCE_PARAM_TYPES);
315 methodArgs[0] = code;
316 Object currency = m.invoke(null, methodArgs);
317
318
321 Class [] paramTypes = new Class [1];
322 paramTypes[0] = currencyClass;
323 Class numberFormatClass = Class.forName("java.text.NumberFormat");
324 m = numberFormatClass.getMethod("setCurrency", paramTypes);
325 methodArgs[0] = currency;
326 m.invoke(formatter, methodArgs);
327 } else {
328
332 DecimalFormat df = (DecimalFormat ) formatter;
333 DecimalFormatSymbols dfs = df.getDecimalFormatSymbols();
334 dfs.setCurrencySymbol(symbol);
335 df.setDecimalFormatSymbols(dfs);
336 }
337 }
338 }
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