content: package org.apache.lucene.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.
   */
  
  /**
   * Interface for string distances.
   */
  public interface StringDistance {
  
    /**
     * 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.
     * @param s1 The first string.
     * @param s2 The second string.
     * @return a float between 0 and 1 based on how similar the specified strings are to one another.
     */
    public float getDistance(String s1,String s2);
    
  }
  