namespace Lucene.Net.Search.Spell
{
    /*
     * Licensed to the Apache Software Foundation (ASF) under one or more
     * contributor license agreements.  See the NOTICE file distributed with
     * this work for additional information regarding copyright ownership.
     * The ASF licenses this file to You 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.
     */

    /// <summary>
    /// Interface for string distances.
    /// </summary>
    public interface IStringDistance
    {

        /// <summary>
        /// Returns a float between 0 and 1 based on how similar the specified strings are to one another.  
        /// Returning a value of 1 means the specified strings are identical and 0 means the
        /// string are maximally different. </summary>
        /// <param name="s1"> The first string. </param>
        /// <param name="s2"> The second string. </param>
        /// <returns> a float between 0 and 1 based on how similar the specified strings are to one another. </returns>
        float GetDistance(string s1, string s2);
    }
}