/libformula-1.1.3/source/org/pentaho/reporting/libraries/formula/function/datetime/MinuteFunction.java
Java | 80 lines | 45 code | 11 blank | 24 comment | 4 complexity | 4a5dd152e18565acca5a04de1e947838 MD5 | raw file
Possible License(s): LGPL-2.1
- /*
- * This program is free software; you can redistribute it and/or modify it under the
- * terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
- * Foundation.
- *
- * You should have received a copy of the GNU Lesser General Public License along with this
- * program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
- * or from the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
- * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
- * See the GNU Lesser General Public License for more details.
- *
- * Copyright (c) 2006 - 2009 Pentaho Corporation and Contributors. All rights reserved.
- */
- package org.pentaho.reporting.libraries.formula.function.datetime;
- import java.math.BigDecimal;
- import org.pentaho.reporting.libraries.formula.EvaluationException;
- import org.pentaho.reporting.libraries.formula.FormulaContext;
- import org.pentaho.reporting.libraries.formula.LibFormulaErrorValue;
- import org.pentaho.reporting.libraries.formula.function.Function;
- import org.pentaho.reporting.libraries.formula.function.ParameterCallback;
- import org.pentaho.reporting.libraries.formula.lvalues.TypeValuePair;
- import org.pentaho.reporting.libraries.formula.typing.TypeRegistry;
- import org.pentaho.reporting.libraries.formula.typing.coretypes.NumberType;
- import org.pentaho.reporting.libraries.formula.util.NumberUtil;
- /**
- * This function extracts the minute (0 through 59) from a time.
- *
- * @author Cedric Pronzato
- */
- public class MinuteFunction implements Function
- {
- private static final BigDecimal MINUTES_PER_DAY = new BigDecimal(24.0 * 60);
- private static final BigDecimal MINUTES = new BigDecimal(60.0);
- private static final BigDecimal HOURS = new BigDecimal(24.0);
-
- public MinuteFunction()
- {
- }
- public String getCanonicalName()
- {
- return "MINUTE";
- }
- public TypeValuePair evaluate(final FormulaContext context,
- final ParameterCallback parameters) throws EvaluationException
- {
- if (parameters.getParameterCount() != 1)
- {
- throw EvaluationException.getInstance(LibFormulaErrorValue.ERROR_ARGUMENTS_VALUE);
- }
- final TypeRegistry typeRegistry = context.getTypeRegistry();
- final Number n = typeRegistry.convertToNumber(parameters.getType(0), parameters.getValue(0));
- if (n == null)
- {
- throw EvaluationException.getInstance(LibFormulaErrorValue.ERROR_INVALID_ARGUMENT_VALUE);
- }
- // calculation is as follows
- // time * 24 so that we get the full hours (which we remove later)
- final BigDecimal bd = NumberUtil.getAsBigDecimal(n);
- final BigDecimal hours = bd.multiply(HOURS);
- final BigDecimal dayAndHoursAsInt = new BigDecimal(NumberUtil.performIntRounding(hours).intValue());
- final BigDecimal minutesFraction = hours.subtract(dayAndHoursAsInt);
-
- // Multiply the minutes with 60 to get the minutes as ints
- final BigDecimal minutes = minutesFraction.multiply(MINUTES);
- final BigDecimal minutesAsInt = minutes.setScale(0, BigDecimal.ROUND_HALF_UP);
- return new TypeValuePair(NumberType.GENERIC_NUMBER, minutesAsInt);
- }
- }