Android Open Source - Rss-App-for-tumblr O P M L

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License

The source code is released under:
GNU General Public License
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Java Source Code

/**
 * Ace Shooting/*from  w  ww .  java2s. com*/
 *
 * Copyright (c) 2010-2012 Stefan Handschuh
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 */

package com.aceshooting.rssapp.provider;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.text.TextUtils;
import android.util.Xml;

import com.aceshooting.rssapp.Strings;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

public class OPML {
  private static final String START = "<?xml version=\"1.0\" encoding=\"utf-8\"?><opml version=\"1.1\"><head><title>Ace Shooting export</title><dateCreated>";
  
  private static final String AFTERDATE = "</dateCreated></head><body>";
  
  private static final String OUTLINE_TITLE = "<outline title=\"";
  
  private static final String OUTLINE_XMLURL = "\" type=\"rss\" xmlUrl=\"";
  
  private static final String ATTRIBUTE_CATEGORY_VALUE = "/"+FeedData.FeedColumns.WIFIONLY;
  
  private static final String OUTLINE_CATEGORY = "\" category=\"";
  
  private static final String OUTLINE_CLOSING = "\" />";
  
  private static final String CLOSING = "</body></opml>\n";
  
  private static OPMLParser parser = new OPMLParser();
  
  public static void importFromFile(String filename, Context context) throws FileNotFoundException, IOException, SAXException {
    parser.context = context;
    parser.database = null;
    Xml.parse(new InputStreamReader(new FileInputStream(filename)), parser);
  }
  
  protected static void importFromInputStream(InputStream inputStream, SQLiteDatabase database) {
    parser.context = null;
    parser.database = database;
    try {
      database.beginTransaction();
      Xml.parse(new InputStreamReader(inputStream), parser);
      
      /** This is ok since the database is empty */
      database.execSQL(new StringBuilder("UPDATE ").append(FeedDataContentProvider.TABLE_FEEDS).append(" SET ").append(FeedData.FeedColumns.PRIORITY).append('=').append(FeedData.FeedColumns._ID).append("-1").toString());
      database.setTransactionSuccessful();
    } catch (Exception e) {
      
    } finally {
      database.endTransaction();
    }
  }
  
  protected static void importFromFile(File file, SQLiteDatabase database) {
    try {
      importFromInputStream(new FileInputStream(file), database);
    } catch (FileNotFoundException e) {
      // do nothing
    }
  }
  
  public static void exportToFile(String filename, Context context) throws IOException {
    Cursor cursor = context.getContentResolver().query(FeedData.FeedColumns.CONTENT_URI, new String[] {FeedData.FeedColumns._ID, FeedData.FeedColumns.NAME, FeedData.FeedColumns.URL, FeedData.FeedColumns.WIFIONLY}, null, null, null);
    
    try {
      writeData(filename, cursor);
    } finally {
      cursor.close();
    }
  }
  
  protected static void exportToFile(String filename, SQLiteDatabase database) {
    Cursor cursor = database.query(FeedDataContentProvider.TABLE_FEEDS, new String[] {FeedData.FeedColumns._ID, FeedData.FeedColumns.NAME, FeedData.FeedColumns.URL, FeedData.FeedColumns.WIFIONLY}, null, null, null, null, FeedData.FEED_DEFAULTSORTORDER);
    
    try {
      writeData(filename, cursor);
    } catch (Exception e) {
      
    }
    cursor.close();
  }
  
  private static void writeData(String filename, Cursor cursor) throws IOException {
    StringBuilder builder = new StringBuilder(START);
    
    builder.append(System.currentTimeMillis());
    builder.append(AFTERDATE);
    
    while(cursor.moveToNext()) {
      builder.append(OUTLINE_TITLE);
      builder.append(cursor.isNull(1) ? Strings.EMPTY : TextUtils.htmlEncode(cursor.getString(1)));
      builder.append(OUTLINE_XMLURL);
      builder.append(TextUtils.htmlEncode(cursor.getString(2)));
      if (cursor.getInt(3) == 1) {
        builder.append(OUTLINE_CATEGORY);
        builder.append(ATTRIBUTE_CATEGORY_VALUE);
      }
      builder.append(OUTLINE_CLOSING);
    }
    builder.append(CLOSING);
    
    BufferedWriter writer = new BufferedWriter(new FileWriter(filename));

    writer.write(builder.toString());
    writer.close();
  }
  
  private static class OPMLParser extends DefaultHandler {
    private static final String TAG_BODY = "body";
    
    private static final String TAG_OUTLINE = "outline";
    
    private static final String ATTRIBUTE_TITLE = "title";
    
    private static final String ATTRIBUTE_XMLURL = "xmlUrl";
    
    private static final String ATTRIBUTE_CATEGORY = "category";
    
    private boolean bodyTagEntered;
    
    private boolean probablyValidElement = false;
    
    private Context context;
    
    private SQLiteDatabase database;
    
    @Override
    public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
      if (!bodyTagEntered) {
        if (TAG_BODY.equals(localName)) {
          bodyTagEntered = true;
          probablyValidElement = true;
        }
      } else if (TAG_OUTLINE.equals(localName)) {
        String url = attributes.getValue(Strings.EMPTY, ATTRIBUTE_XMLURL);
        
        if (url != null) {
          String title = attributes.getValue(Strings.EMPTY, ATTRIBUTE_TITLE);
          
          ContentValues values = new ContentValues();
          
          values.put(FeedData.FeedColumns.URL, url);
          values.put(FeedData.FeedColumns.NAME, title != null && title.length() > 0 ? title : null);
          values.put(FeedData.FeedColumns.WIFIONLY, ATTRIBUTE_CATEGORY_VALUE.equals(attributes.getValue(Strings.EMPTY, ATTRIBUTE_CATEGORY)) ? 1 : 0);
          
          if (context != null) {
            Cursor cursor = context.getContentResolver().query(FeedData.FeedColumns.CONTENT_URI, null, new StringBuilder(FeedData.FeedColumns.URL).append(Strings.DB_ARG).toString(), new String[] {url}, null);
            
            if (!cursor.moveToFirst()) {
              context.getContentResolver().insert(FeedData.FeedColumns.CONTENT_URI, values);
            }
            cursor.close();
          } else { // this happens only, if the db is new and therefore empty
            database.insert(FeedDataContentProvider.TABLE_FEEDS, null, values);
          }
        }
      }
    }
    
    @Override
    public void endElement(String uri, String localName, String qName) throws SAXException {
      if (bodyTagEntered && TAG_BODY.equals(localName)) {
        bodyTagEntered = false;
      }
    }

    @Override
    public void endDocument() throws SAXException {
      if (!probablyValidElement) {
        throw new SAXException();
      } else {
        super.endDocument();
      }
    }
    
    
    
  }
}
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