com.liferay.util.RSSUtil.java Source code

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Here is the source code for com.liferay.util.RSSUtil.java

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/**
 * Copyright (c) 2000-2012 Liferay, Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 */

package com.liferay.util;

import com.liferay.portal.kernel.util.CharPool;
import com.liferay.portal.kernel.util.StringPool;

import com.sun.syndication.feed.synd.SyndContent;
import com.sun.syndication.feed.synd.SyndEntry;
import com.sun.syndication.feed.synd.SyndFeed;
import com.sun.syndication.io.FeedException;
import com.sun.syndication.io.SyndFeedOutput;

import java.util.List;

import org.jdom.IllegalDataException;

/**
 * @author Brian Wing Shun Chan
 */
public class RSSUtil {

    public static final String ATOM = "atom";

    public static final double[] ATOM_VERSIONS = new double[] { 0.3, 1.0 };

    public static final String DISPLAY_STYLE_ABSTRACT = "abstract";

    public static final String DISPLAY_STYLE_FULL_CONTENT = "full-content";

    public static final String DISPLAY_STYLE_TITLE = "title";

    public static final String ENTRY_TYPE_DEFAULT = "html";

    public static final String FEED_TYPE_DEFAULT = getFeedType(RSSUtil.TYPE_DEFAULT, RSSUtil.VERSION_DEFAULT);

    public static final String RSS = "rss";

    public static final double[] RSS_VERSIONS = new double[] { 0.9, 0.91, 0.93, 0.94, 1.0, 2.0 };

    public static final String TYPE_DEFAULT = ATOM;

    public static final double VERSION_DEFAULT = 1.0;

    public static String export(SyndFeed feed) throws FeedException {
        RSSThreadLocal.setExportRSS(true);

        feed.setEncoding(StringPool.UTF8);

        SyndFeedOutput output = new SyndFeedOutput();

        try {
            return output.outputString(feed);
        } catch (IllegalDataException ide) {

            // LEP-4450

            _regexpStrip(feed);

            return output.outputString(feed);
        }
    }

    public static String getFeedType(String type, double version) {
        return type + StringPool.UNDERLINE + version;
    }

    public static String getFormatType(String format) {
        if (format == null) {
            return TYPE_DEFAULT;
        }

        int x = format.indexOf(ATOM);

        if (x >= 0) {
            return ATOM;
        }

        int y = format.indexOf(RSS);

        if (y >= 0) {
            return RSS;
        }

        return TYPE_DEFAULT;
    }

    public static double getFormatVersion(String format) {
        if (format == null) {
            return VERSION_DEFAULT;
        }

        int x = format.indexOf("10");

        if (x >= 0) {
            return 1.0;
        }

        int y = format.indexOf("20");

        if (y >= 0) {
            return 2.0;
        }

        return VERSION_DEFAULT;
    }

    private static String _regexpStrip(String text) {
        text = Normalizer.normalizeToAscii(text);

        char[] array = text.toCharArray();

        for (int i = 0; i < array.length; i++) {
            String s = String.valueOf(array[i]);

            if (!s.matches(_REGEXP_STRIP)) {
                array[i] = CharPool.SPACE;
            }
        }

        return new String(array);
    }

    private static void _regexpStrip(SyndFeed syndFeed) {
        syndFeed.setTitle(_regexpStrip(syndFeed.getTitle()));
        syndFeed.setDescription(_regexpStrip(syndFeed.getDescription()));

        List<SyndEntry> syndEntries = syndFeed.getEntries();

        for (SyndEntry syndEntry : syndEntries) {
            syndEntry.setTitle(_regexpStrip(syndEntry.getTitle()));

            SyndContent syndContent = syndEntry.getDescription();

            syndContent.setValue(_regexpStrip(syndContent.getValue()));
        }
    }

    private static final String _REGEXP_STRIP = "[\\d\\w]";

}