001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.wicket.validation;
018
019import java.util.Map;
020
021/**
022 * Interface representing a message source that stores messages by key and can perform variable
023 * substitution.
024 * 
025 * @author Igor Vaynberg (ivaynberg)
026 * @since 1.2.6
027 */
028public interface IErrorMessageSource
029{
030        /**
031         * Retrieves a message with the given <code>key</code>.
032         * 
033         * @param key
034         *            a message key
035         * @param vars
036         *            variables to substitute
037         * @return message or null if not found
038         */
039        String getMessage(String key, Map<String, Object> vars);
040}