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128 lines
4.9 KiB
128 lines
4.9 KiB
// yFormatter.java
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// -----------------------
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// part of YACY
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// (C) by Michael Peter Christen; mc@anomic.de
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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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//
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// Using this software in any meaning (reading, learning, copying, compiling,
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// running) means that you agree that the Author(s) is (are) not responsible
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// for cost, loss of data or any harm that may be caused directly or indirectly
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// by usage of this softare or this documentation. The usage of this software
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// is on your own risk. The installation and usage (starting/running) of this
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// software may allow other people or application to access your computer and
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// any attached devices and is highly dependent on the configuration of the
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// software which must be done by the user of the software; the author(s) is
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// (are) also not responsible for proper configuration and usage of the
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// software, even if provoked by documentation provided together with
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// the software.
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//
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// Any changes to this file according to the GPL as documented in the file
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// gpl.txt aside this file in the shipment you received can be done to the
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// lines that follows this copyright notice here, but changes must not be
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// done inside the copyright notive above. A re-distribution must contain
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// the intact and unchanged copyright notice.
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// Contributions and changes to the program code must be marked as such.
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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(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(String lang) {
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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(double d, 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(double d) {
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return numForm.format(d);
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}
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public static String number(long l, 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(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(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 (NumberFormatException e) { /* empty */ }
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return (ret == null ? "-" : ret);
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}
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}
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