/**
 * Copyright 2014
 *
 * 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 edu.tuberlin.dima.nerdle.stringmetric;

import scala.Option;

import com.rockymadden.stringmetric.similarity.LevenshteinMetric;

/**
 * Extends StringDistance 
 * @author jasir
 *
 */
public class LevenshteinDistance implements StringDistance {

	/**
	 * Compares two values with the Levenshtein distance metric
	 */
	@Override
	public double getDistance(String a, String b) {
		Option<Object> value = LevenshteinMetric.apply().compare(a, b, null);
		String valueString = value.toString().replace("Some(", "")
				.replace(")", "");
		if (!valueString.equals("None")) {
			double comparedValue = Double.parseDouble(valueString);
			return comparedValue;
		}else{
			return 0.0D;
		}
		
	}

}
