/*
* 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 org.geotoolkit.filter.function.AbstractFunction;
import org.opengis.filter.expression.Expression;
public class IfThenElseFunction extends AbstractFunction {
public IfThenElseFunction(final Expression expr1, final Expression expr2, final Expression expr3) {
super(OtherFunctionFactory.IF_THEN_ELSE, new Expression[]{expr1,expr2,expr3}, null);
}
@Override
public Object evaluate(final Object feature) {
boolean arg0;
Object arg1;
Object arg2;
try { // attempt to get value and perform conversion
arg0 = ((Boolean) parameters.get(0).evaluate(feature))
.booleanValue();
} catch (Exception e) // probably a type error
{
throw new IllegalArgumentException(
"Filter Function problem for function if_then_else argument #0 - expected type boolean");
}
if( arg0 ){
try { // attempt to get value and perform conversion
arg1 = (Object) parameters.get(1).evaluate(feature);
return arg1;
} catch (Exception e) // probably a type error
{
throw new IllegalArgumentException(
"Filter Function problem for function if_then_else argument #1 - expected type Object");
}
}
else {
try { // attempt to get value and perform conversion
arg2 = (Object) parameters.get(2).evaluate(feature);
return arg2;
} catch (Exception e) // probably a type error
{
throw new IllegalArgumentException(
"Filter Function problem for function if_then_else argument #2 - expected type Object");
}
}
}
}