/libformula-1.1.3/source/org/pentaho/reporting/libraries/formula/function/datetime/DateDifFunction.java
Java | 181 lines | 116 code | 24 blank | 41 comment | 19 complexity | 76bb9e7549cc13473dabab5a9ab28093 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.util.Calendar;
- import java.util.Date;
- import java.util.GregorianCalendar;
- import java.util.Locale;
- import java.util.TimeZone;
- 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.LocalizationContext;
- import org.pentaho.reporting.libraries.formula.util.NumberUtil;
- 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;
- /**
- * This function returns the number of years, months, or days between two date
- * numbers.<br/>
- * <p/>
- * The Format is a code from the following table, entered as text, that
- * specifies the format you want: <TABLE> <TR> <TH>format</TH> <TH>Returns the
- * number of</TH> </TR> <TR> <TD>y</TD> <TD>Years</TD> </TR> <TR> <TD>m</TD>
- * <TD>Months. If there is not a complete month between the dates, 0 will be
- * returned.</TD> </TR> <TR> <TD>d</TD> <TD>Days</TD> </TR> <TR> <TD>md</TD>
- * <TD>Days, ignoring months and years</TD> </TR> <TR> <TD>ym</TD> <TD>Months,
- * ignoring years</TD> </TR> <TR> <TD>yd</TD> <TD>Days, ignoring years</TD>
- * </TR> <TR> <TD></TD> <TD></TD> </TR> </TABLE>
- *
- * @author Cedric Pronzato
- */
- public class DateDifFunction implements Function
- {
- public static final String YEARS_CODE = "y";
- public static final String MONTHS_CODE = "m";
- public static final String DAYS_CODE = "d";
- public static final String DAYS_IGNORING_YEARS = "yd";
- public static final String MONTHS_IGNORING_YEARS = "ym";
- public static final String DAYS_IGNORING_MONTHS_YEARS = "md";
- private static final long serialVersionUID = 81013707499607068L;
- public DateDifFunction()
- {
- }
- public String getCanonicalName()
- {
- return "DATEDIF";
- }
- public TypeValuePair evaluate(final FormulaContext context,
- final ParameterCallback parameters)
- throws EvaluationException
- {
- if (parameters.getParameterCount() != 3)
- {
- throw EvaluationException.getInstance(LibFormulaErrorValue.ERROR_ARGUMENTS_VALUE);
- }
- final TypeRegistry typeRegistry = context.getTypeRegistry();
- final String formatCode = typeRegistry.convertToText
- (parameters.getType(2), parameters.getValue(2));
- if (formatCode == null || "".equals(formatCode))
- {
- throw EvaluationException.getInstance(
- LibFormulaErrorValue.ERROR_INVALID_ARGUMENT_VALUE);
- }
- if (DateDifFunction.DAYS_CODE.equals(formatCode))
- {
- final Number date1 = typeRegistry.convertToNumber
- (parameters.getType(0), parameters.getValue(0));
- final Number date2 = typeRegistry.convertToNumber
- (parameters.getType(1), parameters.getValue(1));
- final BigDecimal dn1 = NumberUtil.performIntRounding(NumberUtil.getAsBigDecimal(date1));
- final BigDecimal dn2 = NumberUtil.performIntRounding(NumberUtil.getAsBigDecimal(date2));
- //noinspection UnpredictableBigDecimalConstructorCall
- return new TypeValuePair(NumberType.GENERIC_NUMBER, new BigDecimal(dn2.longValue() - dn1.longValue()));
- }
- final Date date1 = typeRegistry.convertToDate
- (parameters.getType(0), parameters.getValue(0));
- final Date date2 = typeRegistry.convertToDate
- (parameters.getType(1), parameters.getValue(1));
- if (date1 == null || date2 == null)
- {
- throw EvaluationException.getInstance(LibFormulaErrorValue.ERROR_INVALID_ARGUMENT_VALUE);
- }
- final LocalizationContext localizationContext = context.getLocalizationContext();
- final TimeZone timeZone = localizationContext.getTimeZone();
- final Locale locale = localizationContext.getLocale();
- final GregorianCalendar calandar1 =
- new GregorianCalendar(timeZone, locale);
- calandar1.setTime(date1);
- final GregorianCalendar calandar2 =
- new GregorianCalendar(timeZone, locale);
- calandar2.setTime(date2);
- final int res;
- if (DateDifFunction.YEARS_CODE.equals(formatCode))
- {
- res = Math.abs(calandar2.get(Calendar.YEAR) - calandar1.get(Calendar.YEAR));
- }
- else if (DateDifFunction.MONTHS_CODE.equals(formatCode))
- {
- final int month1 = calandar1.get(Calendar.MONTH);
- final int month2 = calandar2.get(Calendar.MONTH);
- final int year1 = calandar1.get(Calendar.YEAR);
- final int year2 = calandar2.get(Calendar.YEAR);
- res = Math.abs(year2 - year1) * 12 + Math.abs(month2 - month1);
- }
- else if (DateDifFunction.DAYS_IGNORING_MONTHS_YEARS.equals(formatCode))
- {
- // The number of days between Date1 and Date2, as if Date1 and
- // Date2 were in the same month and the same year.
- // Not sure what happens to leap years, so this solution may be invalid.
- calandar1.set(Calendar.YEAR, calandar2.get(Calendar.YEAR));
- calandar1.set(Calendar.MONTH, calandar2.get(Calendar.MONTH));
- res = Math.abs(calandar2.get(Calendar.DAY_OF_MONTH) -
- calandar1.get(Calendar.DAY_OF_MONTH));
- }
- else if (DateDifFunction.MONTHS_IGNORING_YEARS.equals(formatCode))
- {
- final int month1 = calandar1.get(Calendar.MONTH);
- final int month2 = calandar2.get(Calendar.MONTH);
- res = Math.abs(month2 - month1);
- }
- else if (DateDifFunction.DAYS_IGNORING_YEARS.equals(formatCode))
- {
- //Isn't that a stupid case? How could we count the days while ignoring
- //how much days there are in each months without using the year?
- // The number of days between Date1 and Date2, as if Date1 and Date2
- // were in the same year.
- // Not sure what happens to leap years, so this solution may be invalid.
- calandar1.set(Calendar.YEAR, calandar2.get(Calendar.YEAR));
- final int dayOne = calandar1.get(Calendar.DAY_OF_YEAR);
- final int dayTwo = calandar2.get(Calendar.DAY_OF_YEAR);
- res = Math.abs(dayOne - dayTwo);
- }
- else
- {
- throw EvaluationException.getInstance(LibFormulaErrorValue.ERROR_INVALID_ARGUMENT_VALUE);
- }
- //noinspection UnpredictableBigDecimalConstructorCall
- return new TypeValuePair(NumberType.GENERIC_NUMBER, new BigDecimal((double) res));
- }
- }