org.supercsv.cellprocessor.ParseDate Maven / Gradle / Ivy
/*
* Copyright 2007 Kasper B. Graversen
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.supercsv.cellprocessor;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import org.supercsv.cellprocessor.ift.DateCellProcessor;
import org.supercsv.cellprocessor.ift.StringCellProcessor;
import org.supercsv.exception.SuperCsvCellProcessorException;
import org.supercsv.util.CsvContext;
/**
* Converts a String to a Date using the {@link SimpleDateFormat} class. If you want to convert from a Date to a String,
* use the {@link FmtDate} processor.
*
* Some example date formats you can use are:
* "dd/MM/yyyy" (parses a date formatted as "25/12/2011")
* "dd-MMM-yy" (parses a date formatted as "25-Dec-11")
* "yyyy.MM.dd.HH.mm.ss" (parses a date formatted as "2011.12.25.08.36.33"
* "E, dd MMM yyyy HH:mm:ss Z" (parses a date formatted as "Tue, 25 Dec 2011 08:36:33 -0500")
*
* This processor caters for lenient or non-lenient date interpretations (the default is false for constructors without
* a 'lenient' parameter). See {@link SimpleDateFormat#setLenient(boolean)} for more information.
*
* If you don't wish to use the default Locale when parsing Dates (your data is formatted for a different Locale), then
* use the constructor that accepts a Locale.
*
* @author Kasper B. Graversen
* @author James Bassett
*/
public class ParseDate extends CellProcessorAdaptor implements StringCellProcessor {
private final String dateFormat;
private final boolean lenient;
private final Locale locale;
/**
* Constructs a new ParseDate processor which converts a String to a Date using the supplied date format.
* This constructor uses non-lenient Date interpretation.
*
* @param dateFormat
* the date format to use
* @throws NullPointerException
* if dateFormat is null
*/
public ParseDate(final String dateFormat) {
this(dateFormat, false);
}
/**
* Constructs a new ParseDate processor which converts a String to a Date using the supplied date format.
*
* @param dateFormat
* the date format to use
* @param lenient
* whether date interpretation is lenient
* @throws NullPointerException
* if dateFormat is null
*/
public ParseDate(final String dateFormat, final boolean lenient) {
super();
checkPreconditions(dateFormat);
this.dateFormat = dateFormat;
this.lenient = lenient;
this.locale = null;
}
/**
* Constructs a new ParseDate processor which converts a String to a Date using the supplied date format
* and Locale.
*
* @param dateFormat
* the date format to use
* @param lenient
* whether date interpretation is lenient
* @param locale
* the Locale used to parse the date
* @throws NullPointerException
* if dateFormat or locale is null
*/
public ParseDate(final String dateFormat, final boolean lenient, final Locale locale) {
super();
checkPreconditions(dateFormat, locale);
this.dateFormat = dateFormat;
this.lenient = lenient;
this.locale = locale;
}
/**
* Constructs a new ParseDate processor which converts a String to a Date using the supplied date format,
* then calls the next processor in the chain. This constructor uses non-lenient Date interpretation.
*
* @param dateFormat
* the date format to use
* @param next
* the next processor in the chain
* @throws NullPointerException
* if dateFormat or next is null
*/
public ParseDate(final String dateFormat, final DateCellProcessor next) {
this(dateFormat, false, next);
}
/**
* Constructs a new ParseDate processor which converts a String to a Date using the supplied date format,
* then calls the next processor in the chain.
*
* @param dateFormat
* the date format to use
* @param lenient
* whether date interpretation is lenient
* @param next
* the next processor in the chain
* @throws NullPointerException
* if dateFormat or next is null
*/
public ParseDate(final String dateFormat, final boolean lenient, final DateCellProcessor next) {
super(next);
checkPreconditions(dateFormat);
this.dateFormat = dateFormat;
this.lenient = lenient;
this.locale = null;
}
/**
* Constructs a new ParseDate processor which converts a String to a Date using the supplied date format
* and Locale, then calls the next processor in the chain.
*
* @param dateFormat
* the date format to use
* @param lenient
* whether date interpretation is lenient
* @param locale
* the Locale used to parse the date
* @param next
* the next processor in the chain
* @throws NullPointerException
* if dateFormat, locale, or next is null
*/
public ParseDate(final String dateFormat, final boolean lenient, final Locale locale, final DateCellProcessor next) {
super(next);
checkPreconditions(dateFormat, locale);
this.dateFormat = dateFormat;
this.lenient = lenient;
this.locale = locale;
}
/**
* Checks the preconditions for creating a new ParseDate processor with a date format.
*
* @param dateFormat
* the date format to use
* @throws NullPointerException
* if dateFormat is null
*/
private static void checkPreconditions(final String dateFormat) {
if( dateFormat == null ) {
throw new NullPointerException("dateFormat should not be null");
}
}
/**
* Checks the preconditions for creating a new ParseDate processor with date format and locale.
*
* @param dateFormat
* the date format to use
* @param locale
* the Locale used to parse the date
* @throws NullPointerException
* if dateFormat or locale is null
*/
private static void checkPreconditions(final String dateFormat, final Locale locale) {
if( dateFormat == null ) {
throw new NullPointerException("dateFormat should not be null");
} else if( locale == null ) {
throw new NullPointerException("locale should not be null");
}
}
/**
* {@inheritDoc}
*
* @throws SuperCsvCellProcessorException
* if value is null, isn't a String, or can't be parsed to a Date
*/
public Object execute(final Object value, final CsvContext context) {
validateInputNotNull(value, context);
if( !(value instanceof String) ) {
throw new SuperCsvCellProcessorException(String.class, value, context, this);
}
try {
final SimpleDateFormat formatter;
if( locale == null ) {
formatter = new SimpleDateFormat(dateFormat);
} else {
formatter = new SimpleDateFormat(dateFormat, locale);
}
formatter.setLenient(lenient);
final Date result = formatter.parse((String) value);
return next.execute(result, context);
}
catch(final ParseException e) {
throw new SuperCsvCellProcessorException(String.format("'%s' could not be parsed as a Date", value),
context, this, e);
}
}
}