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Grace Framework : Grace Plugin I18n
There is a newer version: 2023.2.0-M1
/*
 * Copyright 2004-2022 the original author or authors.
 *
 * Licensed 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
 *
 *      https://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.grails.plugins.i18n;

import org.springframework.boot.autoconfigure.AutoConfigureOrder;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.Ordered;
import org.springframework.web.servlet.DispatcherServlet;
import org.springframework.web.servlet.LocaleResolver;
import org.springframework.web.servlet.i18n.AcceptHeaderLocaleResolver;
import org.springframework.web.servlet.i18n.CookieLocaleResolver;
import org.springframework.web.servlet.i18n.FixedLocaleResolver;
import org.springframework.web.servlet.i18n.LocaleChangeInterceptor;
import org.springframework.web.servlet.i18n.SessionLocaleResolver;

import org.grails.web.i18n.ParamsAwareLocaleChangeInterceptor;

/**
 * Grails locale configuration.
 *
 * @author Michael Yan
 * @since 2022.0.0
 */
@Configuration(proxyBeanMethods = false)
@AutoConfigureOrder(Ordered.HIGHEST_PRECEDENCE + 8)
@ConditionalOnWebApplication(type = ConditionalOnWebApplication.Type.SERVLET)
@ConditionalOnClass(ParamsAwareLocaleChangeInterceptor.class)
@EnableConfigurationProperties(WebLocaleProperties.class)
public class GrailsI18nPluginConfiguration {

    private final WebLocaleProperties webProperties;

    public GrailsI18nPluginConfiguration(WebLocaleProperties webProperties) {
        this.webProperties = webProperties;
    }

    @Bean
    @ConditionalOnMissingBean
    public LocaleChangeInterceptor localeChangeInterceptor() {
        ParamsAwareLocaleChangeInterceptor localeChangeInterceptor = new ParamsAwareLocaleChangeInterceptor();
        localeChangeInterceptor.setParamName(this.webProperties.getParamName());
        return localeChangeInterceptor;
    }

    @Bean
    @ConditionalOnMissingBean(name = DispatcherServlet.LOCALE_RESOLVER_BEAN_NAME)
    public LocaleResolver localeResolver() {
        if (this.webProperties.getLocaleResolver() == WebLocaleProperties.LocaleResolver.FIXED) {
            return new FixedLocaleResolver(this.webProperties.getLocale());
        }
        else if (this.webProperties.getLocaleResolver() == WebLocaleProperties.LocaleResolver.ACCEPT_HEADER) {
            AcceptHeaderLocaleResolver localeResolver = new AcceptHeaderLocaleResolver();
            localeResolver.setDefaultLocale(this.webProperties.getLocale());
            return localeResolver;
        }
        else if (this.webProperties.getLocaleResolver() == WebLocaleProperties.LocaleResolver.COOKIE) {
            CookieLocaleResolver localeResolver = new CookieLocaleResolver();
            return localeResolver;
        }
        return new SessionLocaleResolver();
    }

}