Android Open Source - qshuttle_driver Data Provider

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License

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

/**
 * //w  w w  .java2  s. c  o m
 */
package com.qshuttle.car;



import android.content.ContentProvider;
import android.content.ContentValues;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.net.Uri;
import android.util.Log;

/**
 * @author wangpeifeng
 *
 */
public class DataProvider extends ContentProvider {

  private final static String TAG = "DataProvider";
  
  private DatabaseHelper dbHelper = null;
  private final  static byte[] _dblock = new byte[0]; 


  /* (non-Javadoc)
   * @see android.content.ContentProvider#delete(android.net.Uri, java.lang.String, java.lang.String[])
   */
  @Override
  public int delete(Uri uri, String selection, String[] selectionArgs) {
    // TODO Auto-generated method stub
    int rows = -1;
    
    synchronized (_dblock){

      SQLiteDatabase db = dbHelper.getWritableDatabase();
      
      try{
      
        rows = db.delete(uri.getLastPathSegment(), selection, selectionArgs);
        
      }
      
      catch(SQLiteException e){
      
        e.printStackTrace();
        
      }
      finally{
        
        db.close();
      
      }
        
      
    }
    
    Log.i(TAG, "delete: " + uri.getPath() + "=>" + rows);
      
    return rows;
    
  }

  /* (non-Javadoc)
   * @see android.content.ContentProvider#getType(android.net.Uri)
   */
  @Override
  public String getType(Uri uri) {
    // TODO Auto-generated method stub
    return null;
  }

  /* (non-Javadoc)
   * @see android.content.ContentProvider#insert(android.net.Uri, android.content.ContentValues)
   */
  @Override
  public Uri insert(Uri uri, ContentValues values) {
    // TODO Auto-generated method stub
    long index = -1;
    synchronized (_dblock){
        
        SQLiteDatabase db = dbHelper.getWritableDatabase();
        try{
          index = db.insert(uri.getLastPathSegment(), null, values);
        }
        catch(SQLiteException e){
          e.printStackTrace();
        }
        finally{
          db.close();
        }
        
      
    }
    Log.i(TAG, "insert: " + uri.getPath() + "=>" +index);
    
    if(index==-1)
      
      return null;
    
    else{

      return uri.buildUpon().appendEncodedPath("/"+index).build();
      
    }
  }

  /* (non-Javadoc)
   * @see android.content.ContentProvider#onCreate()
   */
  @Override
  public boolean onCreate() {
    // TODO Auto-generated method stub
    
    String dbName = DatabaseHelper.DB_DATABASE;
    int dbVersion = DatabaseHelper.DB_VERSION;
    CursorFactory factory = null;
    dbHelper = new DatabaseHelper(getContext(),dbName,factory,dbVersion);
    
    return true;
  }

  /* (non-Javadoc)
   * @see android.content.ContentProvider#query(android.net.Uri, java.lang.String[], java.lang.String, java.lang.String[], java.lang.String)
   */
  @Override
  public Cursor query(Uri uri, String[] projection, String selection,
      String[] selectionArgs, String sortOrder) {
    // TODO Auto-generated method stub

    String limit = uri.getQuery();
    
    SQLiteDatabase db = dbHelper.getReadableDatabase();
    String groupBy = null, having = null;
    Cursor cursor = null;
    try{

      //Log.i(TAG, "query: "+uri.getPath());
      cursor = db.query(uri.getLastPathSegment(), projection, selection, selectionArgs, groupBy, having, sortOrder,limit);
      
    }
    catch(SQLiteException e){
      e.printStackTrace();
    }

    return cursor;
    
  }

  /* (non-Javadoc)
   * @see android.content.ContentProvider#update(android.net.Uri, android.content.ContentValues, java.lang.String, java.lang.String[])
   */
  @Override
  public int update(Uri uri, ContentValues values, String selection,
      String[] selectionArgs) {
    // TODO Auto-generated method stub
    int rows = -1;
    synchronized (_dblock){
      
      SQLiteDatabase db = dbHelper.getWritableDatabase();
      try{
        rows = db.update(uri.getLastPathSegment(), values, selection, selectionArgs);
      }
      catch(SQLiteException e){
        e.printStackTrace();
      }
      finally{
        db.close();
      }
      
    }
    Log.i(TAG, "update: " + uri.getPath() + " => "+rows);
    
    return rows;
  }

}
Java Source Code List
