package org.geotools.filter.function.string;
/*
* 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.
*/
//this code is autogenerated - you shouldnt be modifying it!
import java.util.Arrays;
import java.util.List;
import org.geotools.filter.FunctionImpl;
import org.opengis.filter.capability.FunctionName;
import org.opengis.filter.expression.Expression;
import org.opengis.filter.expression.ExpressionVisitor;
/**
* The function concatenates strings.
* <p>
* It is used to create concatenated strings as arguments of functions.
* <p>
* Implementation of Concatenate as defined by SE1.1.
* <p>
*
* @author Jody Garnett (Refractions Research, Inc.)
*
* @source $URL$
*/
public class ConcatenateFunction extends FunctionImpl {
/**
* Make the instance of FunctionName available in
* a consistent spot.
*/
public static final FunctionName NAME = new Name();
/**
* Describe how this function works.
* (should be available via FactoryFinder lookup...)
*/
public static class Name implements FunctionName {
public int getArgumentCount() {
return 2; // indicating unbounded, 2 minimum
}
public List<String> getArgumentNames() {
return Arrays.asList(new String[]{
"text 1",
"text 2",
"text 3"
});
}
public String getName() {
return "Concatenate";
}
};
public ConcatenateFunction() {
}
@Override
public String getName() {
return NAME.getName();
}
public int getArgCount() {
return 2; // treat this as minimum argument count
}
public Object evaluate(Object feature) {
StringBuffer text = new StringBuffer();
for( Expression expression: (List<Expression>) getParameters() ){
try {
String str = (String) expression.evaluate(feature, String.class);
text.append( str );
}
catch( Exception couldNotCompute){
// log me please
}
}
return text.toString();
}
}