/*
* 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.
*/
package org.geotools.filter.function;
import java.text.DecimalFormat;
import org.geotools.filter.FunctionExpressionImpl;
import org.geotools.filter.capability.FunctionNameImpl;
import org.opengis.filter.capability.FunctionName;
/**
* Formats a number into a string given a certain pattern (specified in the format accepted
* by {@link DecimalFormat}}
* @author Andrea Aime - OpenGeo
*
*
*
* @source $URL$
*/
public class FilterFunction_numberFormat extends FunctionExpressionImpl {
public static FunctionName NAME = new FunctionNameImpl("numberFormat","string","number");
public FilterFunction_numberFormat() {
super("numberFormat");
functionName = NAME;
}
@Override
public int getArgCount() {
return 2;
}
public Object evaluate(Object feature) {
String format;
Double number;
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
number = getExpression(1).evaluate(feature, Double.class);
} catch (Exception e) // probably a type error
{
throw new IllegalArgumentException(
"Filter Function problem for function dateFormat argument #1 - expected type java.util.Date");
}
DecimalFormat numberFormat = new DecimalFormat(format);
return numberFormat.format(number);
}
}