/*
* Geotoolkit - An Open Source Java GIS Toolkit
* http://www.geotoolkit.org
*
* (C) 2005-2008, Open Source Geospatial Foundation (OSGeo)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License.
*
* This library 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.
*/
package org.geotoolkit.filter.function.other;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import org.geotoolkit.filter.function.AbstractFunction;
import org.opengis.filter.expression.Expression;
/**
* Formats a date into a string given a certain pattern (specified in the format accepted
* by {@link SimpleDateFormat}}
* @see SimpleDateFormat
* @author Andrea Aime - TOPP
* @module
*/
public class DateFormatFunction extends AbstractFunction {
public DateFormatFunction(final Expression expr1, final Expression expr2) {
super(OtherFunctionFactory.DATE_FORMAT, new Expression[]{expr1,expr2}, null);
}
@Override
public Object evaluate(final Object feature) {
String format;
Date date;
try {
// attempt to get value and perform conversion
format = parameters.get(0).evaluate(feature, String.class);
} catch (Exception e) // probably a type error
{
throw new IllegalArgumentException(
"Filter Function problem for function dateFormat argument #0 - expected type String");
}
try { // attempt to get value and perform conversion
date = parameters.get(1).evaluate(feature, Date.class);
} catch (Exception e) // probably a type error
{
throw new IllegalArgumentException(
"Filter Function problem for function dateFormat argument #1 - expected type java.util.Date");
}
DateFormat dateFormat = new SimpleDateFormat(format);
return dateFormat.format(date);
}
}