16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package java.util;
27
28 import java.io.*;
29 import java.math.*;
30 import java.nio.*;
31 import java.nio.channels.*;
32 import java.nio.charset.*;
33 import java.nio.file.Path;
34 import java.nio.file.Files;
35 import java.text.*;
36 import java.util.function.Consumer;
37 import java.util.regex.*;
38 import java.util.stream.Stream;
39 import java.util.stream.StreamSupport;
40
41 /**
42 * A simple text scanner which can parse primitive types and strings using
43 * regular expressions.
44 *
45 * <p>A {@code Scanner} breaks its input into tokens using a
46 * delimiter pattern, which by default matches whitespace. The resulting
47 * tokens may then be converted into values of different types using the
48 * various {@code next} methods.
49 *
50 * <p>For example, this code allows a user to read a number from
51 * {@code System.in}:
52 * <blockquote><pre>{@code
53 * Scanner sc = new Scanner(System.in);
54 * int i = sc.nextInt();
55 * }</pre></blockquote>
56 *
57 * <p>As another example, this code allows {@code long} types to be
58 * assigned from entries in a file {@code myNumbers}:
59 * <blockquote><pre>{@code
1169
1170 /**
1171 * Sets this scanner's locale to the specified locale.
1172 *
1173 * <p>A scanner's locale affects many elements of its default
1174 * primitive matching regular expressions; see
1175 * <a href= "#localized-numbers">localized numbers</a> above.
1176 *
1177 * <p>Invoking the {@link #reset} method will set the scanner's locale to
1178 * the <a href= "#initial-locale">initial locale</a>.
1179 *
1180 * @param locale A string specifying the locale to use
1181 * @return this scanner
1182 */
1183 public Scanner useLocale(Locale locale) {
1184 if (locale.equals(this.locale))
1185 return this;
1186
1187 modCount++;
1188 this.locale = locale;
1189 DecimalFormat df =
1190 (DecimalFormat)NumberFormat.getNumberInstance(locale);
1191 DecimalFormatSymbols dfs = DecimalFormatSymbols.getInstance(locale);
1192
1193 // These must be literalized to avoid collision with regex
1194 // metacharacters such as dot or parenthesis
1195 groupSeparator = "\\" + dfs.getGroupingSeparator();
1196 decimalSeparator = "\\" + dfs.getDecimalSeparator();
1197
1198 // Quoting the nonzero length locale-specific things
1199 // to avoid potential conflict with metacharacters
1200 nanString = "\\Q" + dfs.getNaN() + "\\E";
1201 infinityString = "\\Q" + dfs.getInfinity() + "\\E";
1202 positivePrefix = df.getPositivePrefix();
1203 if (positivePrefix.length() > 0)
1204 positivePrefix = "\\Q" + positivePrefix + "\\E";
1205 negativePrefix = df.getNegativePrefix();
1206 if (negativePrefix.length() > 0)
1207 negativePrefix = "\\Q" + negativePrefix + "\\E";
1208 positiveSuffix = df.getPositiveSuffix();
1209 if (positiveSuffix.length() > 0)
1210 positiveSuffix = "\\Q" + positiveSuffix + "\\E";
1211 negativeSuffix = df.getNegativeSuffix();
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16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package java.util;
27
28 import java.io.*;
29 import java.math.*;
30 import java.nio.*;
31 import java.nio.channels.*;
32 import java.nio.charset.*;
33 import java.nio.file.Path;
34 import java.nio.file.Files;
35 import java.text.*;
36 import java.text.spi.NumberFormatProvider;
37 import java.util.function.Consumer;
38 import java.util.regex.*;
39 import java.util.stream.Stream;
40 import java.util.stream.StreamSupport;
41 import sun.util.locale.provider.LocaleProviderAdapter;
42 import sun.util.locale.provider.ResourceBundleBasedAdapter;
43
44 /**
45 * A simple text scanner which can parse primitive types and strings using
46 * regular expressions.
47 *
48 * <p>A {@code Scanner} breaks its input into tokens using a
49 * delimiter pattern, which by default matches whitespace. The resulting
50 * tokens may then be converted into values of different types using the
51 * various {@code next} methods.
52 *
53 * <p>For example, this code allows a user to read a number from
54 * {@code System.in}:
55 * <blockquote><pre>{@code
56 * Scanner sc = new Scanner(System.in);
57 * int i = sc.nextInt();
58 * }</pre></blockquote>
59 *
60 * <p>As another example, this code allows {@code long} types to be
61 * assigned from entries in a file {@code myNumbers}:
62 * <blockquote><pre>{@code
1172
1173 /**
1174 * Sets this scanner's locale to the specified locale.
1175 *
1176 * <p>A scanner's locale affects many elements of its default
1177 * primitive matching regular expressions; see
1178 * <a href= "#localized-numbers">localized numbers</a> above.
1179 *
1180 * <p>Invoking the {@link #reset} method will set the scanner's locale to
1181 * the <a href= "#initial-locale">initial locale</a>.
1182 *
1183 * @param locale A string specifying the locale to use
1184 * @return this scanner
1185 */
1186 public Scanner useLocale(Locale locale) {
1187 if (locale.equals(this.locale))
1188 return this;
1189
1190 modCount++;
1191 this.locale = locale;
1192
1193 DecimalFormat df = null;
1194 NumberFormat nf = NumberFormat.getNumberInstance(locale);
1195 DecimalFormatSymbols dfs = DecimalFormatSymbols.getInstance(locale);
1196 if (nf instanceof DecimalFormat) {
1197 df = (DecimalFormat) nf;
1198 } else {
1199
1200 // In case where NumberFormat.getNumberInstance() returns
1201 // other instance (non DecimalFormat) based on the provider
1202 // used and java.text.spi.NumberFormatProvider implementations,
1203 // DecimalFormat constructor is used to obtain the instance
1204 LocaleProviderAdapter adapter = LocaleProviderAdapter
1205 .getAdapter(NumberFormatProvider.class, locale);
1206 if (!(adapter instanceof ResourceBundleBasedAdapter)) {
1207 adapter = LocaleProviderAdapter.getResourceBundleBased();
1208 }
1209 String[] all = adapter.getLocaleResources(locale)
1210 .getNumberPatterns();
1211 df = new DecimalFormat(all[0], dfs);
1212 }
1213
1214 // These must be literalized to avoid collision with regex
1215 // metacharacters such as dot or parenthesis
1216 groupSeparator = "\\" + dfs.getGroupingSeparator();
1217 decimalSeparator = "\\" + dfs.getDecimalSeparator();
1218
1219 // Quoting the nonzero length locale-specific things
1220 // to avoid potential conflict with metacharacters
1221 nanString = "\\Q" + dfs.getNaN() + "\\E";
1222 infinityString = "\\Q" + dfs.getInfinity() + "\\E";
1223 positivePrefix = df.getPositivePrefix();
1224 if (positivePrefix.length() > 0)
1225 positivePrefix = "\\Q" + positivePrefix + "\\E";
1226 negativePrefix = df.getNegativePrefix();
1227 if (negativePrefix.length() > 0)
1228 negativePrefix = "\\Q" + negativePrefix + "\\E";
1229 positiveSuffix = df.getPositiveSuffix();
1230 if (positiveSuffix.length() > 0)
1231 positiveSuffix = "\\Q" + positiveSuffix + "\\E";
1232 negativeSuffix = df.getNegativeSuffix();
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