package org.geotools.filter.function;
/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.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.
*/
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import org.geotools.filter.FunctionExpressionImpl;
/**
* Formats a date into a string given a certain pattern (specified in the format accepted
* by {@link SimpleDateFormat}}
* @see SimpleDateFormat
* @author Andrea Aime - TOPP
*
*
* @source $URL$
*/
public class FilterFunction_dateFormat extends FunctionExpressionImpl {
public FilterFunction_dateFormat() {
super("dateFormat");
}
@Override
public int getArgCount() {
return 2;
}
public Object evaluate(Object feature) {
String format;
Date date;
try {
// attempt to get value and perform conversion
format = getExpression(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 = getExpression(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);
}
}