001/*
002 * Copyright 2002-2018 the original author or authors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *      https://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.springframework.web.servlet.mvc.condition;
018
019import org.springframework.lang.Nullable;
020import org.springframework.web.bind.annotation.RequestMapping;
021
022/**
023 * A contract for {@code "name!=value"} style expression used to specify request
024 * parameters and request header conditions in {@code @RequestMapping}.
025 *
026 * @author Rossen Stoyanchev
027 * @since 3.1
028 * @param <T> the value type
029 * @see RequestMapping#params()
030 * @see RequestMapping#headers()
031 */
032public interface NameValueExpression<T> {
033
034        String getName();
035
036        @Nullable
037        T getValue();
038
039        boolean isNegated();
040
041}