Android Open Source - PlayTunes Media Query

From Project

Back to project page PlayTunes.
License

The source code is released under:
Copyright (c) 2014, Impeccable Labs, LLC. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions ar...
If you think the Android project PlayTunes listed in this page is inappropriate, such as containing malicious code/tools or violating the copyright, please email info at java2s dot com, thanks.
Java Source Code

package com.ideabag.playtunes.database;
// w  w  w  . jav  a2  s  .  c om
import java.util.Date;

import com.google.gson.Gson;

import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteException;
import android.net.Uri;
import android.os.AsyncTask;

public class MediaQuery {
  
  protected class MediaQueryJSONObject {
    
    public String mContentUriString;
    public String[] mProjection;
    public String mSelection;
    public String[] mSelectionArgs;
    public String mOrderBy;
    
  }
  
  protected MediaQueryJSONObject mQueryObject;
  
  public MediaQuery( String jsonString ) {
    
    Gson gson = new Gson();
    
    this.mQueryObject = gson.fromJson( jsonString, MediaQueryJSONObject.class );
    
    
    
  }
  
  public MediaQuery( Uri mUri, String[] projection ) {
    this( mUri, projection, null, null, null );
  }
  
  public MediaQuery( Uri mUri, String[] projection, String selection, String[] args ) {
    this( mUri, projection, selection, args, null );
  }
  
  public MediaQuery( Uri mUri, String[] projection, String selection, String[] args, String orderBy ) {
    
    mQueryObject = new MediaQueryJSONObject();
    
    mQueryObject.mContentUriString = mUri.toString();
    mQueryObject.mProjection = projection;
    mQueryObject.mSelection = selection;
    mQueryObject.mSelectionArgs = args;
    mQueryObject.mOrderBy = orderBy;
    
  }
  
  
  // Synchronous execution, execution of this method is wrapped in an AsyncTask
  /*
  public Uri getUri() { return this.mContentUri; }
  public String[] getProjection() { return this.mProjection; }
  public String getSelection() { return this.mSelection; }
  public String[] getSelectionArgs() { return this.mSelectionArgs; };
  public String getOrderBy() { return this.mOrderBy; }
  */
  public static Cursor execute( Context mContext, MediaQuery query ) {
    
    Cursor result = null;
    
    try {
      
      result = mContext.getContentResolver().query(
        Uri.parse( query.mQueryObject.mContentUriString ),
        query.mQueryObject.mProjection,
        query.mQueryObject.mSelection,
        query.mQueryObject.mSelectionArgs,
        query.mQueryObject.mOrderBy );
     
     } catch( Exception e ) {
       
       // Failed
       
     }
    
    return result;
    
  }
  
  public static void executeAsync( Context mContext, MediaQuery query, OnQueryCompletedListener onComplete ) {
    
    new MediaQueryTask( mContext, onComplete ).execute( query );
    
    
  }
  
  @Override public boolean equals( Object ob ) {
    
    boolean isEqual = false;
    
    if ( ob instanceof MediaQuery ) {
      
      try {
        
        MediaQuery other = ( MediaQuery ) ob;
        
        if ( other.mQueryObject.mContentUriString.equals( mQueryObject.mContentUriString )
            && other.mQueryObject.mProjection.equals( mQueryObject.mProjection ) ) {
          
          if ( ( other.mQueryObject.mSelection == null && mQueryObject.mSelection == null )
              || ( other.mQueryObject.mSelection != null && mQueryObject.mSelection != null && other.mQueryObject.mSelection.equals( mQueryObject.mSelection ) ) ) {
            
            if ( ( other.mQueryObject.mSelectionArgs == null && mQueryObject.mSelectionArgs == null)
                || ( other.mQueryObject.mSelectionArgs != null
                    && mQueryObject.mSelectionArgs != null
                    && other.mQueryObject.mSelectionArgs.equals( mQueryObject.mSelectionArgs )
                  ) ) {
              
              if ( ( other.mQueryObject.mSelectionArgs == null && mQueryObject.mSelectionArgs == null)
                || ( other.mQueryObject.mSelectionArgs != null
                    && mQueryObject.mSelectionArgs != null
                    && other.mQueryObject.mSelectionArgs.equals( mQueryObject.mSelectionArgs )
                  ) ) {
                
                isEqual = true;
                
              }
              
            }
            
          }
          
          
          
        }
        
      } catch( Exception e ) {
        
        isEqual = false;
        
      }
      
    }
    
    
    return isEqual;
    
  }
  
  public String toJSONString() {
    
    Gson gson = new Gson();
    
    String mJSONString = gson.toJson( mQueryObject, MediaQueryJSONObject.class );
    
    
    return mJSONString;
    
  }
  
  @Override public String toString() {
    
    return toJSONString();
    
  }
  
  //
  // Async execution of the query
  //
  
  
  public interface OnQueryCompletedListener {
    
    void onQueryCompleted( MediaQuery mQuery, Cursor mResult );
    
  }
  
  protected static class MediaQueryTask extends AsyncTask< MediaQuery, Void, Cursor > {
    
    private Context mContext;
    private OnQueryCompletedListener mListener;
    private MediaQuery mQuery;
    
    public MediaQueryTask( Context context, OnQueryCompletedListener listener ) {
      
      mContext = context;
      mListener = listener;
      
    }
    
       protected Cursor doInBackground( MediaQuery... queries ) {
           
         mQuery = queries[ 0 ];
           
         Cursor mQueryCursor = null;
         
         if ( null != mQuery ) {
           
           // Run the query of unknown execution time
           // The search queries have been running a little long and so they sometimes display incomplete searches
           //
           mQueryCursor = MediaQuery.execute( mContext, mQuery );
           
           
         }
           
           return mQueryCursor;
           
       }

       protected void onPostExecute( Cursor result ) {
          
         //android.util.Log.i( "MediaQueryTask", "HERE" );
         if ( null != mListener ) {
           
           try {
             
             mListener.onQueryCompleted( mQuery, result );
             
           } catch ( Exception e ) {
             
             // Fail silently
             
           }
           
         }
         
       }
       
   }
  
}
Java Source Code List
