/*
 * JBoss, Home of Professional Open Source.
 * See the COPYRIGHT.txt file distributed with this work for information
 * regarding copyright ownership.  Some portions may be licensed
 * to Red Hat, Inc. under one or more contributor license agreements.
 * 
 * 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; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * 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.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301 USA.
 */

package org.teiid.translator.jdbc.sybase;

import java.util.Arrays;
import java.util.List;

import org.teiid.language.Expression;
import org.teiid.language.Function;
import org.teiid.language.LanguageFactory;
import org.teiid.translator.SourceSystemFunctions;
import org.teiid.translator.TypeFacility;
import org.teiid.translator.jdbc.FunctionModifier;


/**
 * Common logic for Substring modifiers requiring 3 parameters
 */
public class SubstringFunctionModifier extends FunctionModifier {

    private LanguageFactory languageFactory;
    
    public SubstringFunctionModifier(LanguageFactory languageFactory) {
    	this.languageFactory = languageFactory; 
    }

    @Override
    public List<?> translate(Function function) {
        List<Expression> args = function.getParameters();
        
        if(args.size() == 2) {
            args.add(languageFactory.createFunction(SourceSystemFunctions.LENGTH, Arrays.asList(args.get(0)), TypeFacility.RUNTIME_TYPES.INTEGER)); 
        } 
    	return null;
    }
    
}