/*
* 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.catalina.valves.rewrite;
import org.apache.tomcat.util.res.StringManager;
/**
* Interface for user defined lookup/replacement logic that can be defined in a {@code rewrite.config} file by a
* {@code RewriteMap} directive. Such a map can then be used by a {@code RewriteRule} defined in the same file.
* <p>
* An example {@code rewrite.config} file could look like:
*
* <pre>
* RewriteMap uc example.UpperCaseMap
*
* RewriteRule ^/(.*)$ ${uc:$1}
* </pre>
*
* One parameter can be optionally appended to the {@code RewriteMap} directive. This could be used – for example
* – to specify a name of a file, that contains a lookup table used by the implementation of the map.
*/
public interface RewriteMap {
/**
* Optional parameter that can be defined through the {@code RewriteMap} directive in the {@code rewrite.config}
* file.
*
* @param params the optional parameter
*
* @return value is currently ignored
*/
String setParameters(String params);
/**
* Optional parameters that can be defined through the {@code RewriteMap} directive in the {@code rewrite.config}
* file.
* <p>
* This method will be called, if there is more than one parameter defined.
*
* @param params the optional parameters
*/
default void setParameters(String... params) {
if (params == null) {
return;
}
if (params.length > 1) {
throw new IllegalArgumentException(
StringManager.getManager(RewriteMap.class).getString("rewriteMap.tooManyParameters"));
}
setParameters(params[0]);
}
/**
* Maps a key to a replacement value.<br>
* The method is free to return {@code null} to indicate, that the default value from the {@code RewriteRule}
* directive should be used.
*
* @param key used by the actual implementation to generate a mapped value
*
* @return mapped value or {@code null}
*/
String lookup(String key);
}