/*
 * Copyright Red Hat, Inc. and/or its affiliates
 * and other contributors as indicated by the @author tags and
 * the COPYRIGHT.txt file distributed with this work.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

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;
    }
    
}