/*
* 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.
*/
package org.apache.jackrabbit.core.util;
/**
* A persistent two-way mapping between strings and index integers. The
* index may or may not be sequential.
*/
public interface StringIndex {
/**
* Returns the index for a given string. If the given string is not
* already indexed, the implementation can either automatically index
* it or throw an exception.
*
* @param string the indexed (or to be indexed) string
* @return index of the string
* @throws IllegalArgumentException if the string is not
* (and can not be) indexed
*/
int stringToIndex(String string) throws IllegalArgumentException;
/**
* Returns the string for a given index.
*
* @param idx index of a string
* @return the indexed string
* @throws IllegalArgumentException if the indexed string does not exist
*/
String indexToString(int idx) throws IllegalArgumentException;
}