com.entertailion.android.slideshow.rss.RssHandler.java Source code

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Here is the source code for com.entertailion.android.slideshow.rss.RssHandler.java

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/*
 * Copyright (C) 2013 ENTERTAILION LLC
 *
 * 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 com.entertailion.android.slideshow.rss;

import java.io.StringReader;
import java.text.SimpleDateFormat;
import java.util.Locale;

import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.apache.commons.lang3.StringEscapeUtils;
import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.DefaultHandler;

import android.util.Log;

/**
 * Parser for RSS feed. See RssFeed.
 * 
 * @author leon_nicholls
 * 
 */
public class RssHandler extends DefaultHandler {
    private static final String LOG_CAT = "RssHandler";

    private RssFeed feed;
    private RssItem item;
    private StringBuilder chars = new StringBuilder();
    private boolean isItem = false;
    private boolean isImage = false;
    private SimpleDateFormat dateFormat = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss Z", Locale.ENGLISH);

    public RssFeed getFeed() {
        return feed;
    }

    @Override
    public void startElement(String uri, String localName, String qName, Attributes attributes) {
        chars.delete(0, chars.length());

        if (qName.equalsIgnoreCase("image")) {
            if (!isItem) {
                isImage = true;
            }
        } else if (qName.equalsIgnoreCase("item")) {
            isItem = true;
            item = new RssItem();
            feed.addItem(item);
        }
    }

    @Override
    public void characters(char[] ch, int start, int length) {
        chars.append(ch, start, length);
    }

    @Override
    public void endElement(String uri, String localName, String qName) {
        if (localName.equalsIgnoreCase("image")) {
            if (!isItem) {
                isImage = false;
            }
        } else if (localName.equalsIgnoreCase("url")) {
            if (isImage) {
                feed.setLogo(StringEscapeUtils.unescapeXml(chars.toString()));
            }
        } else if (localName.equalsIgnoreCase("ttl")) {
            if (!isItem) {
                feed.setTtl(Integer.parseInt(StringEscapeUtils.unescapeXml(chars.toString())));
            }
        } else if (localName.equalsIgnoreCase("title")) {
            if (!isImage) {
                if (isItem) {
                    item.setTitle(StringEscapeUtils.unescapeXml(chars.toString()));
                } else {
                    feed.setTitle(StringEscapeUtils.unescapeXml(chars.toString()));
                }
            }
        } else if (localName.equalsIgnoreCase("description")) {
            if (isItem) {
                item.setDescription(StringEscapeUtils.unescapeXml(chars.toString()));
            } else {
                feed.setDescription(StringEscapeUtils.unescapeXml(chars.toString()));
            }
        } else if (localName.equalsIgnoreCase("pubDate")) {
            if (isItem) {
                try {
                    item.setDate(dateFormat.parse(StringEscapeUtils.unescapeXml(chars.toString())));
                } catch (Exception e) {
                    Log.e(LOG_CAT, "pubDate", e);
                }
            } else {
                try {
                    feed.setDate(dateFormat.parse(StringEscapeUtils.unescapeXml(chars.toString())));
                } catch (Exception e) {
                    Log.e(LOG_CAT, "pubDate", e);
                }
            }
        } else if (localName.equalsIgnoreCase("item")) {
            isItem = false;
        } else if (localName.equalsIgnoreCase("link")) {
            if (isItem) {
                item.setLink(StringEscapeUtils.unescapeXml(chars.toString()));
            } else {
                feed.setLink(StringEscapeUtils.unescapeXml(chars.toString()));
            }
        }

        if (localName.equalsIgnoreCase("item")) {
        }

    }

    public RssFeed getFeed(String data) throws Exception {
        feed = null;
        SAXParserFactory spf = SAXParserFactory.newInstance();
        SAXParser sp = spf.newSAXParser();
        XMLReader xr = sp.getXMLReader();

        InputSource inStream = new org.xml.sax.InputSource();
        inStream.setCharacterStream(new StringReader(data));

        xr.setContentHandler(this);
        feed = new RssFeed();
        xr.parse(inStream);

        xr = null;
        sp = null;
        spf = null;

        return feed;
    }

}