WikiProvider.java

/*
    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.wiki;

import java.util.Properties;
import java.io.IOException;

import org.apache.wiki.api.exceptions.NoRequiredPropertyException;

/**
 *  A generic Wiki provider for all sorts of things that the Wiki can
 *  store.
 *
 *  @since 2.0
 */
public interface WikiProvider
{
    /**
     *  Passing this to any method should get the latest version
     */
    int LATEST_VERSION = -1;

    /**
     *  Initializes the page provider.
     *  
     *  @param engine WikiEngine to own this provider
     *  @param properties A set of properties used to initialize this provider
     *  @throws NoRequiredPropertyException If the provider needs a property which is not found in the property set
     *  @throws IOException If there is an IO problem
     */
    void initialize( WikiEngine engine, Properties properties )
        throws NoRequiredPropertyException,
               IOException;

    /**
     *  Return a valid HTML string for information.  May
     *  be anything.
     *  @since 1.6.4
     *  @return A string describing the provider.
     */

    String getProviderInfo();
}