/*
* 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.string;
import org.geotoolkit.filter.function.AbstractFunction;
import org.opengis.filter.expression.Expression;
public class LengthFunction extends AbstractFunction {
public LengthFunction(final Expression expression) {
super(StringFunctionFactory.LENGTH, new Expression[]{expression}, null);
}
@Override
public Object evaluate(final Object feature) {
String arg0;
if(feature instanceof CharSequence){
return ((CharSequence)feature).length();
}
try { // attempt to get value and perform conversion
arg0 = parameters.get(0).evaluate(feature, String.class);
} catch (Exception e) { // probably a type error
throw new IllegalArgumentException(
"Filter Function problem for function strLength argument #0 - expected type String");
}
return arg0==null ? 0 : arg0.length();
}
}