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      1 /*
      2  * Copyright (C) 2010 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 package com.android.contacts.list;
     17 
     18 import android.content.Context;
     19 import android.content.CursorLoader;
     20 import android.database.Cursor;
     21 import android.database.MatrixCursor;
     22 import android.net.Uri;
     23 
     24 /**
     25  * A specialized loader for the Join Contacts UI.  It executes two queries:
     26  * join suggestions and (optionally) the full contact list.
     27  */
     28 public class JoinContactLoader extends CursorLoader {
     29 
     30     private boolean mLoadSuggestionsAndAllContacts;
     31     private String[] mProjection;
     32     private Uri mSuggestionUri;
     33     private MatrixCursor mSuggestionsCursor;
     34 
     35     public JoinContactLoader(Context context) {
     36         super(context, null, null, null, null, null);
     37     }
     38 
     39     public void setLoadSuggestionsAndAllContacts(boolean flag) {
     40         mLoadSuggestionsAndAllContacts = flag;
     41     }
     42 
     43     public void setSuggestionUri(Uri uri) {
     44         this.mSuggestionUri = uri;
     45     }
     46 
     47     @Override
     48     public void setProjection(String[] projection) {
     49         super.setProjection(projection);
     50         this.mProjection = projection;
     51     }
     52 
     53     public Cursor getSuggestionsCursor() {
     54         return mSuggestionsCursor;
     55     }
     56 
     57     @Override
     58     public Cursor loadInBackground() {
     59         // First execute the suggestions query, then call super.loadInBackground
     60         // to load the entire list
     61         mSuggestionsCursor = loadSuggestions();
     62         if (!mLoadSuggestionsAndAllContacts && mSuggestionsCursor.getCount() != 0) {
     63             // In case we only need suggestions, send "0" as the search query, which
     64             // will always return an empty cursor (but we can still register to
     65             // listen for changes on it).
     66             setSelection("0");
     67             setSelectionArgs(null);
     68         }
     69         return super.loadInBackground();
     70     }
     71 
     72     /**
     73      * Loads join suggestions into a MatrixCursor.
     74      */
     75     private MatrixCursor loadSuggestions() {
     76         Cursor cursor = getContext().getContentResolver().query(mSuggestionUri, mProjection,
     77                 null, null, null);
     78         try {
     79             MatrixCursor matrix = new MatrixCursor(mProjection);
     80             Object[] row = new Object[mProjection.length];
     81             while (cursor.moveToNext()) {
     82                 for (int i = 0; i < row.length; i++) {
     83                     row[i] = cursor.getString(i);
     84                 }
     85                 matrix.addRow(row);
     86             }
     87             return matrix;
     88         } finally {
     89             cursor.close();
     90         }
     91     }
     92 }