001    /* 
002        Licensed to the Apache Software Foundation (ASF) under one
003        or more contributor license agreements.  See the NOTICE file
004        distributed with this work for additional information
005        regarding copyright ownership.  The ASF licenses this file
006        to you under the Apache License, Version 2.0 (the
007        "License"); you may not use this file except in compliance
008        with the License.  You may obtain a copy of the License at
009    
010           http://www.apache.org/licenses/LICENSE-2.0
011    
012        Unless required by applicable law or agreed to in writing,
013        software distributed under the License is distributed on an
014        "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015        KIND, either express or implied.  See the License for the
016        specific language governing permissions and limitations
017        under the License.  
018     */
019    package org.apache.wiki.providers;
020    
021    /**
022     *  This is a provider interface which providers can implement, if they
023     *  support fast checks of versions.
024     *  <p>
025     *  Note that this interface is pretty much a hack to support certain functionality
026     *  before a complete refactoring of the complete provider interface.  Please
027     *  don't bug me too much about it...
028     *  
029     *
030     *  @since 2.3.29
031     */
032    public interface VersioningProvider
033    {
034        /**
035         *  Return true, if page with a particular version exists.
036         *  
037         *  @param page The page name to check for
038         *  @param version The version to check
039         *  @return True, if page exists; false otherwise.
040         */
041        boolean pageExists( String page, int version );
042    }