Android Open Source - unmp W P L Parser

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License

The source code is released under:
MIT License
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Java Source Code

package com.parnswir.unmp.playlist.parser;
/*  w w w.j ava  2  s. c o m*/
import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;

import android.util.Xml;

import com.parnswir.unmp.core.C;
import com.parnswir.unmp.core.DatabaseUtils;
import com.parnswir.unmp.playlist.MediaFile;
import com.parnswir.unmp.playlist.Playlist;

public class WPLParser extends PlaylistParser {
  
  public static final String MUSIC_IN_MY_LIBRARY = "{4202947A-A563-4B05-A754-A1B4B5989849}";
  
  
  private static final String namespace = null;
  
  private static final Set<String> NOT_SUPPORTED_KEYWORDS = new HashSet<String>(Arrays.asList(
       new String[] {"Ascending", "Descending", "Random"}
  ));
  
  private static final Map<String, String> TYPE_MAPPING = new HashMap<String, String>();
  static{
    TYPE_MAPPING.put("User Rating", C.TAB_TITLES + "." + C.COL_RATING);
    TYPE_MAPPING.put("Genre", C.TAB_GENRES + "." + C.COL_GENRE);
    TYPE_MAPPING.put("Album Title", C.TAB_ALBUMS + "." + C.COL_ALBUM);
  }
  
  private static final Map<String, String> CONDITION_MAPPING = new HashMap<String, String>();
  static{
    CONDITION_MAPPING.put("Is", " IS \"%s\"");
    CONDITION_MAPPING.put("Is Not", " IS NOT \"%s\"");
    
    CONDITION_MAPPING.put("Contains", " LIKE \"%%%s%%\"");
    CONDITION_MAPPING.put("Does Not Contain", " NOT LIKE \"%%%s%%\"");

    CONDITION_MAPPING.put("Equals", " = %s");
    CONDITION_MAPPING.put("Does Not Equal", " != \"%s\"");
    
    CONDITION_MAPPING.put("Is At Least", " >= %s");
    CONDITION_MAPPING.put("Is No More Than", " <= %s");
    
    CONDITION_MAPPING.put("Is Less Than", " < %s");
    CONDITION_MAPPING.put("Is Greater Than", " > %s");
    
    CONDITION_MAPPING.put("Is Before", " < %s");
    CONDITION_MAPPING.put("Is Later Than", " > %s");
    
    CONDITION_MAPPING.put("Is More Recent Than", " >= %s");
    
    CONDITION_MAPPING.put("Above", " > %s");
    CONDITION_MAPPING.put("Below", " < %s");
  }
  
  private static final Map<String, String> UNIT_MAPPING = new HashMap<String, String>();
  static{
    UNIT_MAPPING.put("5 stars", "10");
    UNIT_MAPPING.put("4 stars", "8");
    UNIT_MAPPING.put("3 stars", "6");
    UNIT_MAPPING.put("2 stars", "4");
    UNIT_MAPPING.put("1 stars", "2");
    UNIT_MAPPING.put("0 stars", "0");
  }
  
  public WPLParser() {
    
  }
  
  public Playlist buildPlaylist() throws WPLParserException {
    InputStream in = null;
    try {
      in = new BufferedInputStream(new FileInputStream(fileName));
      parse(in);
      in.close();
    } catch (FileNotFoundException e) {
      e.printStackTrace();
    } catch (XmlPullParserException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    }
    return playlist;
  }
     
    public void parse(InputStream in) throws XmlPullParserException, IOException, WPLParserException {
        try {
            XmlPullParser parser = Xml.newPullParser();
            parser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, false);
            parser.setInput(in, null);
            parser.nextTag();
            readXML(parser);
        } finally {
            in.close();
        }
    }
    
    private void readXML(XmlPullParser parser) throws XmlPullParserException, IOException, WPLParserException {
        String condition = "(1=0)";

        parser.require(XmlPullParser.START_TAG, namespace, "smil");
        while (parser.next() != XmlPullParser.END_DOCUMENT) {
            if (parser.getEventType() != XmlPullParser.START_TAG) {
                continue;
            }
            
            String name = parser.getName();
            
            if (name.equals("title")) {
              if (parser.next() == XmlPullParser.TEXT)
                playlist.setName(parser.getText());
            }
            
            if (name.equals("media")) {
              String path = parser.getAttributeValue(namespace, "src");
              path = path.replace("\\", "/");
              playlist.children.add(new MediaFile(directory + path));
            }
            
            if (name.equals("sourceFilter")) {
              String guid = parser.getAttributeValue(namespace, "id");
              if (guid.equals(MUSIC_IN_MY_LIBRARY)) {
                
                condition += " OR ((1=1)";
                
                while (parser.next() != XmlPullParser.END_DOCUMENT) {
                  
                  if (parser.getEventType() == XmlPullParser.END_TAG) {
                    String innerName = parser.getName();
                    if (innerName.equals("sourceFilter")) {
                      break;
                    } else {
                      continue;
                    }
                        }
                  
                  if (parser.getEventType() == XmlPullParser.START_TAG) {
                    String innerName = parser.getName();
                    
                    if (innerName.equals("fragment")) {
                      String fragmentName = parser.getAttributeValue(namespace, "name");
                      condition += " AND " + TYPE_MAPPING.get(fragmentName);
                      
                      int argumentCount = 0;
                      String argument = "";
                      String value = "";
                      
                      while (parser.next() != XmlPullParser.END_DOCUMENT) {
                              
                              if (parser.getEventType() == XmlPullParser.END_TAG) {
                                String nodeName = parser.getName();
                                if (nodeName.equals("fragment")) {
                                  condition += String.format(argument, value);
                                  break;
                                } else {
                                  continue;
                                }
                              }
                              
                              if (parser.getEventType() == XmlPullParser.START_TAG) {
                                String nodeName = parser.getName();
                                
                                if (nodeName.equals("argument")) {
                                  parser.next();
                                  if (argumentCount == 0) {
                                    argument = parser.getText();
                                    if (CONDITION_MAPPING.containsKey(argument)) {
                                      argument = CONDITION_MAPPING.get(argument);
                                    } else {
                                      throw new WPLParserException("Used unsupported condition " + argument);
                                    }
                                    
                                    argumentCount++;
                                  } else {
                                    value = parser.getText();
                                    if (UNIT_MAPPING.containsKey(value)) {
                                      value = UNIT_MAPPING.get(value);
                                    }
                                    
                                    if (NOT_SUPPORTED_KEYWORDS.contains(value)) {
                                      throw new WPLParserException("Used unsupported keyword " + value);
                                    }
                                  }
                                }
                                
                              }
                      }
                      
                    }
                    
                        }
                  
                }
                
                condition += ")";
                
              }
            }
            
        } 
        
        if (condition.length() > 0) {
          String query = String.format("SELECT %s.%s FROM %s WHERE %s", C.TAB_TITLES, C.COL_FILE, getJoinNecessaryFor(condition), condition);
          playlist.addItemsFromFilter(database, query);
        }
    }
      
    private String getJoinNecessaryFor(String condition) {
      ArrayList<String> tables = new ArrayList<String>();
      for (String table : C.TABLENAMES)
        if (condition.indexOf(table) > -1)
          tables.add(table);
      String[] array = new String[tables.size()];
      array = tables.toArray(array);
      return DatabaseUtils.getJoinForTables(array);
    }    
    
    public static class WPLParserException extends PlaylistParserException {
      
    private static final long serialVersionUID = 1345253070867225300L;

    public WPLParserException(String message) {
      super(message);
    }
      
    }

}
Java Source Code List
