001/* 002 * Copyright 2002-2017 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.theme; 018 019import javax.servlet.http.HttpServletRequest; 020import javax.servlet.http.HttpServletResponse; 021 022import org.springframework.lang.Nullable; 023 024/** 025 * {@link org.springframework.web.servlet.ThemeResolver} implementation 026 * that simply uses a fixed theme. The fixed name can be defined via 027 * the "defaultThemeName" property; out of the box, it is "theme". 028 * 029 * <p>Note: Does not support {@code setThemeName}, as the fixed theme 030 * cannot be changed. 031 * 032 * @author Jean-Pierre Pawlak 033 * @author Juergen Hoeller 034 * @since 17.06.2003 035 * @see #setDefaultThemeName 036 */ 037public class FixedThemeResolver extends AbstractThemeResolver { 038 039 @Override 040 public String resolveThemeName(HttpServletRequest request) { 041 return getDefaultThemeName(); 042 } 043 044 @Override 045 public void setThemeName( 046 HttpServletRequest request, @Nullable HttpServletResponse response, @Nullable String themeName) { 047 048 throw new UnsupportedOperationException("Cannot change theme - use a different theme resolution strategy"); 049 } 050 051}