org.iish.visualmets.util.LocaleChangeInterceptor.java Source code

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Here is the source code for org.iish.visualmets.util.LocaleChangeInterceptor.java

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/*
 * Copyright 2010 International Institute for Social History, The Netherlands.
 *
 * 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
 *
 * http://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.iish.visualmets.util;

import org.springframework.beans.propertyeditors.LocaleEditor;
import org.springframework.web.servlet.LocaleResolver;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;
import org.springframework.web.servlet.support.RequestContextUtils;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Locale;

/**
 * If a language preference was set in the request URL,
 * we use that language to override the client's (browser) locale.
 *
 * Canabalised and simplified for it's inherent qualities from:
 * eu.europeana.core.util.web
 *
 * Created by IntelliJ IDEA.
 * Date: 16-okt-2010
 * Time: 12:58:05
 *
 * @author: Lucien van Wouw <lwo@iisg.nl>
 */
public class LocaleChangeInterceptor extends HandlerInterceptorAdapter {

    public static final String DEFAULT_PARAM_NAME = "locale";

    private String paramName = DEFAULT_PARAM_NAME;

    public void setParamName(String paramName) {
        this.paramName = paramName;
    }

    public String getParamName() {
        return this.paramName;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws ServletException {

        String newLocale = request.getParameter(this.paramName);
        if (newLocale != null) {
            LocaleResolver localeResolver = RequestContextUtils.getLocaleResolver(request);
            if (localeResolver == null) {
                throw new IllegalStateException("No LocaleResolver found: not in a DispatcherServlet request?");
            }
            LocaleEditor localeEditor = new LocaleEditor();
            localeEditor.setAsText(newLocale);
            localeResolver.setLocale(request, response, (Locale) localeEditor.getValue());
        }

        return true;
    }
}