de.micromata.genome.gwiki.page.impl.i18n.GWikiI18NServletFilter.java Source code

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Here is the source code for de.micromata.genome.gwiki.page.impl.i18n.GWikiI18NServletFilter.java

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//
// Copyright (C) 2010-2016 Roger Rene Kommer & Micromata GmbH
//
// 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 de.micromata.genome.gwiki.page.impl.i18n;

import java.io.IOException;
import java.util.List;
import java.util.Locale;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.jsp.jstl.core.Config;
import javax.servlet.jsp.jstl.fmt.LocalizationContext;

import org.apache.commons.lang3.StringUtils;

import de.micromata.genome.gwiki.model.GWikiWeb;
import de.micromata.genome.gwiki.web.GWikiServlet;
import de.micromata.genome.util.types.Converter;
import de.micromata.genome.util.types.Pair;

/**
 * Servlet Filter for using GWiki I18N Modules.
 * 
 * @author Roger Rene Kommer (r.kommer@micromata.de)
 * 
 */
public class GWikiI18NServletFilter implements Filter {
    public static ThreadLocal<Pair<HttpServletRequest, HttpServletResponse>> HTTPCTX = new ThreadLocal<Pair<HttpServletRequest, HttpServletResponse>>();

    private List<String> modules;

    public static final String REQUEST_SCOPE_SUFFIX = ".request";

    public static final String LOCALIZATION_KEY = Config.FMT_LOCALIZATION_CONTEXT + REQUEST_SCOPE_SUFFIX;

    public static final String LOC_KEY = Config.FMT_LOCALE + REQUEST_SCOPE_SUFFIX;

    public void initWiki(HttpServletRequest req, HttpServletResponse resp) {
        if (GWikiServlet.INSTANCE == null) {
            throw new RuntimeException(
                    "Cannot initialize GWikiSnippets because no GWikiServlet.INSTANCE can be found");
        }
        GWikiWeb wikiWeb = GWikiWeb.get();

        if (wikiWeb == null) {
            GWikiServlet.INSTANCE.initWiki(req, resp);
            wikiWeb = GWikiWeb.get();
        }
    }

    /*
     * (non-Javadoc)
     * 
     * @see javax.servlet.Filter#doFilter(javax.servlet.ServletRequest, javax.servlet.ServletResponse, javax.servlet.FilterChain)
     */
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        HttpServletRequest hreq = (HttpServletRequest) request;
        HttpServletResponse hresp = (HttpServletResponse) response;
        HTTPCTX.set(Pair.make(hreq, hresp));
        initWiki(hreq, hresp);
        Locale loc = hreq.getLocale();
        Object ploc = request.getAttribute(LOC_KEY);
        if (ploc instanceof Locale) {
            loc = (Locale) ploc;
        }
        LocalizationContext prevLocContext = null;
        Object plc = hreq.getAttribute(LOCALIZATION_KEY);
        if (plc instanceof LocalizationContext) {
            prevLocContext = (LocalizationContext) plc;
        }

        Object prevfml = hreq.getAttribute(LOC_KEY);
        Object prevlocaiz = hreq.getAttribute(LOCALIZATION_KEY);
        try {
            hreq.setAttribute(LOC_KEY, loc);
            hreq.setAttribute(LOCALIZATION_KEY, new LocalizationContext(
                    new GWikiI18NCombinedResourceBundle(loc, prevLocContext, modules), loc));

            chain.doFilter(request, response);
        } finally {
            hreq.setAttribute(LOC_KEY, prevfml);
            hreq.setAttribute(LOCALIZATION_KEY, prevlocaiz);
            HTTPCTX.set(null);
        }
    }

    /*
     * (non-Javadoc)
     * 
     * @see javax.servlet.Filter#init(javax.servlet.FilterConfig)
     */
    public void init(FilterConfig filterConfig) throws ServletException {

        String moduless = filterConfig.getInitParameter("I18NModules");
        if (StringUtils.isEmpty(moduless) == true) {
            throw new ServletException("Filter needs init parameter I18NModules");
        }
        modules = Converter.parseStringTokens(moduless, ", ", false);
        if (modules.isEmpty() == true) {
            throw new ServletException("Filter needs init parameter I18NModules with at least one module");
        }
    }

    /*
     * (non-Javadoc)
     * 
     * @see javax.servlet.Filter#destroy()
     */
    public void destroy() {

    }

}