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}