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/** |
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$Id $ |
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|
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Copyright (C) 2013 Nicklas Nordborg |
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This file is part of BASE - BioArray Software Environment. |
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Available at http://base.thep.lu.se/ |
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|
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BASE is free software; you can redistribute it and/or |
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modify it under the terms of the GNU General Public License |
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as published by the Free Software Foundation; either version 3 |
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of the License, or (at your option) any later version. |
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|
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BASE 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 BASE. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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package net.sf.basedb.util.formatter; |
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|
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import net.sf.basedb.util.Values; |
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import net.sf.basedb.util.excel.ExcelValue; |
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|
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/** |
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Formats a number for output on a web page adapting thwe number of |
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decimals depending on the order of magnitude of the value. The precision |
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value is defined to be the number of decimals to use for values |
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between 1 and 10 (not inclusive). The number of decimals are then |
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increase or decreased for each order of magnitude that the value |
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get smaller or larger. |
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|
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@author nicklas |
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@since 3.2.2 |
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@base.modified $Date$ |
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*/ |
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public class AdaptiveNumberFormatter |
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extends NumberFormatter |
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{ |
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|
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private final int precision; |
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/** |
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Create a new number formatter. |
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@param precision The number of decimals to display for values |
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between 1 and 10 (for lower and higher values the number of decimals is |
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adjusted), or a negative value to display all decimals |
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@param doubleValues If the {@link #parseString(String)} should return double |
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or float values |
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@see Values#formatNumber(Float, int) |
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*/ |
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public AdaptiveNumberFormatter(int precision, boolean doubleValues) |
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{ |
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super(precision, doubleValues); |
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this.precision = precision; |
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} |
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|
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/* |
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From the Formatter interface |
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------------------------------------------- |
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*/ |
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@Override |
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public String format(Number value) |
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{ |
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if (value == null) return ""; |
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return Values.formatNumber(value.floatValue(), getNumDecimals(value)); |
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} |
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// ------------------------------------------- |
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|
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/** |
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@since 3.15 |
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*/ |
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@Override |
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public ExcelValue<Number> toExcelValue(Number value) |
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{ |
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return ExcelValue.asNumber(value, getNumDecimals(value)); |
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} |
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|
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private int getNumDecimals(Number value) |
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{ |
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int numDecimals = precision; |
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if (precision >= 0 && value != null) |
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{ |
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int orderOfMagnitude = (int)Math.floor(Math.log10(Math.abs(value.doubleValue()))); // =0 for values between 1-10 |
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if (orderOfMagnitude < 0) orderOfMagnitude++; // One decimal less for value between 0 and 1 |
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numDecimals -= orderOfMagnitude; |
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if (numDecimals < 0) numDecimals = 0; |
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if (numDecimals > 7) numDecimals = 7; |
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} |
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return numDecimals; |
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} |
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} |