org.myjerry.evenstar.web.feed.FeedController.java Source code

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Here is the source code for org.myjerry.evenstar.web.feed.FeedController.java

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/**
 * myJerry | Evenstar
 * Copyright (C) 2010 myJerry Development Team
 * http://www.myjerry.org
 * 
 * The file is licensed under the 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.myjerry.evenstar.web.feed;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.myjerry.evenstar.enums.FeedFormat;
import org.myjerry.evenstar.service.BlogService;
import org.myjerry.evenstar.service.FeedService;
import org.myjerry.util.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.multiaction.MultiActionController;

/**
 * Feeds are supported in the following format
 * 
 * http://domain/feeds/posts/default
 * http://domain/feeds/posts/postID/default
 * http://domain/feeds/posts/postID/comments
 * http://domain/feeds/comments/default
 * 
 * http://domain/feeds/alias/posts/default
 * http://domain/feeds/alias/posts/postID/default
 * http://domain/feeds/alias/posts/postID/comments
 * http://domain/feeds/alias/comments/default
 * 
 * @author sangupta
 *
 */
public class FeedController extends MultiActionController {

    @Autowired
    private BlogService blogService;

    @Autowired
    private FeedService feedService;

    public ModelAndView view(HttpServletRequest request, HttpServletResponse response) throws Exception {
        String uri = request.getRequestURI();
        FeedFormat feedFormat = null;

        // strip off the 'feeds/' from the URI
        uri = uri.substring(7);
        int extIndex = uri.lastIndexOf(".");
        if (extIndex != -1) {
            String extension = uri.substring(extIndex + 1);
            uri = uri.substring(0, extIndex);
            feedFormat = FeedFormat.getFeedFormat(extension);
        }

        if (feedFormat == null) {
            // bad request
            response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
            return null;
        }

        Long blogID = this.blogService.getBlogIDForServerName(request.getServerName());
        if (blogID == null) {
            // try and see if the URI contains the blog ID
            String alias = uri;
            int index = uri.indexOf("/");
            if (index != -1) {
                alias = uri.substring(0, index);
            }
            Long id = this.blogService.getBlogIDForAlias(alias);
            if (id != null) {
                blogID = id;
                uri = uri.substring(index + 1);
            } else {
                // just can't do anything now
                // no feed found
                response.setStatus(HttpServletResponse.SC_NOT_FOUND);
                return null;
            }
        }

        // decipher the type of feed
        if ("posts/default".equals(uri)) {
            return blogPostsFeed(feedFormat, blogID);
        } else if ("comments/default".equals(uri)) {
            return blogCommentsFeed(feedFormat, blogID);
        } else if (uri.startsWith("posts/")) {
            // try and get the post ID from this
            uri = uri.substring(6);
            int index = uri.indexOf("/");
            if (index != -1) {
                Long postID = StringUtils.getLong(uri.substring(0, index));
                if (postID != null) {
                    uri = uri.substring(index + 1);
                    if ("default".equals(uri)) {
                        return blogPostFeed(feedFormat, blogID, postID);
                    } else if ("comments".equals(uri)) {
                        return blogPostCommentFeed(feedFormat, blogID, postID);
                    }
                }
            }
        }

        response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
        return null;
    }

    private ModelAndView blogPostsFeed(FeedFormat feedFormat, Long blogID) {
        String feedContents = this.feedService.getPostsFeed(feedFormat, blogID);
        return getModelAndView("Blog All Posts Feed");
    }

    private ModelAndView blogCommentsFeed(FeedFormat feedFormat, Long blogID) {
        String feedContents = this.feedService.getCommentsFeed(feedFormat, blogID);
        return getModelAndView("Blog All Comments Feed");
    }

    private ModelAndView blogPostFeed(FeedFormat feedFormat, Long blogID, Long postID) {
        String feedContents = this.feedService.getPostFeed(feedFormat, blogID, postID);
        return getModelAndView("Blog Post Feed");
    }

    private ModelAndView blogPostCommentFeed(FeedFormat feedFormat, Long blogID, Long postID) {
        String feedContents = this.feedService.getPostCommentFeed(feedFormat, blogID, postID);
        return getModelAndView("Blog Comment Feed");
    }

    private ModelAndView getModelAndView(String feedContents) {
        ModelAndView mav = new ModelAndView();
        mav.addObject("contents", feedContents);
        mav.setViewName(".feed.output");
        return mav;
    }

    //---------------------------------------------
    // Usual accessor's follow
    //---------------------------------------------

    /**
     * @return the blogService
     */
    public BlogService getBlogService() {
        return blogService;
    }

    /**
     * @param blogService the blogService to set
     */
    public void setBlogService(BlogService blogService) {
        this.blogService = blogService;
    }

    /**
     * @return the feedService
     */
    public FeedService getFeedService() {
        return feedService;
    }

    /**
     * @param feedService the feedService to set
     */
    public void setFeedService(FeedService feedService) {
        this.feedService = feedService;
    }

}