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110 lines
3.8 KiB
110 lines
3.8 KiB
// yFormatter.java
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// -----------------------
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// part of YACY
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// (C) by Michael Peter Christen; mc@yacy.net
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// first published on http://www.anomic.de
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// Frankfurt, Germany, 2004
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//
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// (C) 2007 Bjoern 'Fuchs' Krombholz; fox.box@gmail.com
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package de.anomic.tools;
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import java.text.DecimalFormat;
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import java.text.DecimalFormatSymbols;
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import java.text.NumberFormat;
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import java.util.Locale;
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/**
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* This class provides simple Formatters to unify YaCy's output
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* formattings.
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*
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* At the moment yFormatter can be used to format numbers according
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* to the locale set for YaCy.
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*/
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public final class yFormatter {
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// default formatter
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private static NumberFormat numForm = NumberFormat.getInstance(new Locale("en"));
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// generic formatter that can be used when no localized formatting is allowed
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private static final NumberFormat cleanNumForm =
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new DecimalFormat("####.##", new DecimalFormatSymbols(Locale.ENGLISH));
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static {
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// just initialize defaults on class load
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initDefaults();
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}
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/**
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* @param locale the {@link Locale} to set or <code>null</code> to set the special
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* empty locale to create unformatted numbers
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*/
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public static void setLocale(final Locale locale) {
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numForm = (locale == null ? cleanNumForm : NumberFormat.getInstance(locale));
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initDefaults();
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}
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/**
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* @param lang an ISO 639 language code which is used to generate a {@link Locale}
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*/
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public static void setLocale(final String lang) {
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final String l = (lang.equalsIgnoreCase("default") ? "en" : lang.toLowerCase());
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setLocale(l.equals("none") ? null : new Locale(l));
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}
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private static void initDefaults() {
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numForm.setGroupingUsed(true); // always group int digits
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numForm.setParseIntegerOnly(false); // allow int/double/float
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numForm.setMaximumFractionDigits(2); // 2 decimal digits for float/double
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}
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public static String number(final double d, final boolean localized) {
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return (localized ? number(d) : cleanNumForm.format(d));
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}
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public static String number(final double d) {
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return numForm.format(d);
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}
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public static String number(final long l, final boolean localized) {
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return (localized ? number(l) : cleanNumForm.format(l));
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}
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public static String number(final long l) {
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return numForm.format(l);
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}
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/**
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* Method formats String representation of numbers according to the formatting
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* rules for numbers defined by this class. This method is probably only useful
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* for "numbers" read from property files.
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* @param s string to parse into a number and reformat
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* @return the formatted number as a String or "-" in case of a parsing error
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*/
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public static String number(final String s) {
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String ret = null;
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try {
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if (s.indexOf('.') == -1) {
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ret = number(Long.parseLong(s));
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} else {
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ret = number(Double.parseDouble(s));
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}
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} catch (final NumberFormatException e) { /* empty */ }
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return (ret == null ? "-" : ret);
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}
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}
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