001    package ezvcard.util;
002    
003    import java.text.DecimalFormat;
004    import java.text.DecimalFormatSymbols;
005    
006    /*
007     Copyright (c) 2013, Michael Angstadt
008     All rights reserved.
009    
010     Redistribution and use in source and binary forms, with or without
011     modification, are permitted provided that the following conditions are met: 
012    
013     1. Redistributions of source code must retain the above copyright notice, this
014     list of conditions and the following disclaimer. 
015     2. Redistributions in binary form must reproduce the above copyright notice,
016     this list of conditions and the following disclaimer in the documentation
017     and/or other materials provided with the distribution. 
018    
019     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
020     ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
021     WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
022     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
023     ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
024     (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
025     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
026     ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
027     (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
028     SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
029     */
030    
031    /**
032     * Formats floating-point values for vCards. Notably, this ensures that a "." is
033     * used as decimal separator, no matter the locale.
034     * @author Michael Angstadt
035     */
036    @SuppressWarnings("serial")
037    public class VCardFloatFormatter extends DecimalFormat {
038            /**
039             * Creates a new formatter with a max of 6 decimals.
040             */
041            public VCardFloatFormatter() {
042                    this(6);
043            }
044    
045            /**
046             * Creates a new formatter.
047             * @param decimals the max number of decimal places
048             */
049            public VCardFloatFormatter(int decimals) {
050                    setMaximumFractionDigits(decimals);
051                    if (decimals > 0) {
052                            setMinimumFractionDigits(1);
053                    }
054    
055                    //decimal separator differs by locale (e.g. Germany uses ",")
056                    DecimalFormatSymbols symbols = new DecimalFormatSymbols();
057                    symbols.setDecimalSeparator('.');
058                    symbols.setMinusSign('-');
059                    setDecimalFormatSymbols(symbols);
060            }
061    }