19066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/* 29066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Copyright (C) 2007 The Android Open Source Project 39066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 49066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Licensed under the Apache License, Version 2.0 (the "License"); 59066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * you may not use this file except in compliance with the License. 69066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * You may obtain a copy of the License at 79066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 89066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 99066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Unless required by applicable law or agreed to in writing, software 119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * See the License for the specific language governing permissions and 149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * limitations under the License. 159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpackage com.android.internal.database; 189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.database.AbstractCursor; 209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.database.Cursor; 219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.database.DataSetObserver; 229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.util.Log; 239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/** 259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * A variant of MergeCursor that sorts the cursors being merged. If decent 269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * performance is ever obtained, it can be put back under android.database. 279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpublic class SortCursor extends AbstractCursor 299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project{ 309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private static final String TAG = "SortCursor"; 319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private Cursor mCursor; // updated in onMove 329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private Cursor[] mCursors; 339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private int [] mSortColumns; 349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private final int ROWCACHESIZE = 64; 359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private int mRowNumCache[] = new int[ROWCACHESIZE]; 369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private int mCursorCache[] = new int[ROWCACHESIZE]; 379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private int mCurRowNumCache[][]; 389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private int mLastCacheHit = -1; 399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private DataSetObserver mObserver = new DataSetObserver() { 419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void onChanged() { 449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Reset our position so the optimizations in move-related code 459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // don't screw us over 469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mPos = -1; 479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void onInvalidated() { 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mPos = -1; 529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project }; 549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public SortCursor(Cursor[] cursors, String sortcolumn) 569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project { 579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mCursors = cursors; 589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int length = mCursors.length; 609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mSortColumns = new int[length]; 619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (int i = 0 ; i < length ; i++) { 629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mCursors[i] == null) continue; 639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Register ourself as a data set observer 659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mCursors[i].registerDataSetObserver(mObserver); 669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mCursors[i].moveToFirst(); 689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // We don't catch the exception 709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mSortColumns[i] = mCursors[i].getColumnIndexOrThrow(sortcolumn); 719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mCursor = null; 739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project String smallest = ""; 749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (int j = 0 ; j < length; j++) { 759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mCursors[j] == null || mCursors[j].isAfterLast()) 769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project continue; 779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project String current = mCursors[j].getString(mSortColumns[j]); 789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mCursor == null || current.compareToIgnoreCase(smallest) < 0) { 799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project smallest = current; 809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mCursor = mCursors[j]; 819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (int i = mRowNumCache.length - 1; i >= 0; i--) { 859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mRowNumCache[i] = -2; 869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mCurRowNumCache = new int[ROWCACHESIZE][length]; 889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int getCount() 929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project { 939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int count = 0; 949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int length = mCursors.length; 959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (int i = 0 ; i < length ; i++) { 969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mCursors[i] != null) { 979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project count += mCursors[i].getCount(); 989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return count; 1019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 1049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean onMove(int oldPosition, int newPosition) 1059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project { 1069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (oldPosition == newPosition) 1079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 1089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* Find the right cursor 1109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Because the client of this cursor (the listadapter/view) tends 1119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to jump around in the cursor somewhat, a simple cache strategy 1129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * is used to avoid having to search all cursors from the start. 1139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * TODO: investigate strategies for optimizing random access and 1149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * reverse-order access. 1159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int cache_entry = newPosition % ROWCACHESIZE; 1189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mRowNumCache[cache_entry] == newPosition) { 1209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int which = mCursorCache[cache_entry]; 1219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mCursor = mCursors[which]; 1229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mCursor == null) { 1239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project Log.w(TAG, "onMove: cache results in a null cursor."); 1249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 1259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mCursor.moveToPosition(mCurRowNumCache[cache_entry][which]); 1279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mLastCacheHit = cache_entry; 1289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 1299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mCursor = null; 1329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int length = mCursors.length; 1339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mLastCacheHit >= 0) { 1359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (int i = 0; i < length; i++) { 1369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mCursors[i] == null) continue; 1379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mCursors[i].moveToPosition(mCurRowNumCache[mLastCacheHit][i]); 1389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (newPosition < oldPosition || oldPosition == -1) { 1429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (int i = 0 ; i < length; i++) { 1439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mCursors[i] == null) continue; 1449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mCursors[i].moveToFirst(); 1459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project oldPosition = 0; 1479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (oldPosition < 0) { 1499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project oldPosition = 0; 1509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // search forward to the new position 1539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int smallestIdx = -1; 1549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for(int i = oldPosition; i <= newPosition; i++) { 1559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project String smallest = ""; 1569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project smallestIdx = -1; 1579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (int j = 0 ; j < length; j++) { 1589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mCursors[j] == null || mCursors[j].isAfterLast()) { 1599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project continue; 1609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project String current = mCursors[j].getString(mSortColumns[j]); 1629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (smallestIdx < 0 || current.compareToIgnoreCase(smallest) < 0) { 1639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project smallest = current; 1649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project smallestIdx = j; 1659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (i == newPosition) break; 1689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mCursors[smallestIdx] != null) { 1699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mCursors[smallestIdx].moveToNext(); 1709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mCursor = mCursors[smallestIdx]; 1739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mRowNumCache[cache_entry] = newPosition; 1749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mCursorCache[cache_entry] = smallestIdx; 1759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (int i = 0; i < length; i++) { 1769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mCursors[i] != null) { 1779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mCurRowNumCache[cache_entry][i] = mCursors[i].getPosition(); 1789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mLastCacheHit = -1; 1819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 1829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 1859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public String getString(int column) 1869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project { 1879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mCursor.getString(column); 1889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 1919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public short getShort(int column) 1929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project { 1939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mCursor.getShort(column); 1949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 1979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int getInt(int column) 1989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project { 1999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mCursor.getInt(column); 2009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public long getLong(int column) 2049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project { 2059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mCursor.getLong(column); 2069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public float getFloat(int column) 2109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project { 2119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mCursor.getFloat(column); 2129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public double getDouble(int column) 2169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project { 2179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mCursor.getDouble(column); 2189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2218b0dd7da360d70920a37802eb455ba41500d3b45Vasu Nori public int getType(int column) { 2228b0dd7da360d70920a37802eb455ba41500d3b45Vasu Nori return mCursor.getType(column); 2238b0dd7da360d70920a37802eb455ba41500d3b45Vasu Nori } 2248b0dd7da360d70920a37802eb455ba41500d3b45Vasu Nori 2258b0dd7da360d70920a37802eb455ba41500d3b45Vasu Nori @Override 2269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean isNull(int column) 2279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project { 2289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mCursor.isNull(column); 2299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public byte[] getBlob(int column) 2339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project { 2349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mCursor.getBlob(column); 2359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public String[] getColumnNames() 2399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project { 2409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mCursor != null) { 2419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mCursor.getColumnNames(); 2429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 243eb785fa71a4b2c83158fbde42ec515bbbfe356fbDianne Hackborn // All of the cursors may be empty, but they can still return 244eb785fa71a4b2c83158fbde42ec515bbbfe356fbDianne Hackborn // this information. 245eb785fa71a4b2c83158fbde42ec515bbbfe356fbDianne Hackborn int length = mCursors.length; 246eb785fa71a4b2c83158fbde42ec515bbbfe356fbDianne Hackborn for (int i = 0 ; i < length ; i++) { 247eb785fa71a4b2c83158fbde42ec515bbbfe356fbDianne Hackborn if (mCursors[i] != null) { 248eb785fa71a4b2c83158fbde42ec515bbbfe356fbDianne Hackborn return mCursors[i].getColumnNames(); 249eb785fa71a4b2c83158fbde42ec515bbbfe356fbDianne Hackborn } 250eb785fa71a4b2c83158fbde42ec515bbbfe356fbDianne Hackborn } 251eb785fa71a4b2c83158fbde42ec515bbbfe356fbDianne Hackborn throw new IllegalStateException("No cursor that can return names"); 2529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void deactivate() 2579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project { 2589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int length = mCursors.length; 2599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (int i = 0 ; i < length ; i++) { 2609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mCursors[i] == null) continue; 2619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mCursors[i].deactivate(); 2629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void close() { 2679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int length = mCursors.length; 2689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (int i = 0 ; i < length ; i++) { 2699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mCursors[i] == null) continue; 2709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mCursors[i].close(); 2719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void registerDataSetObserver(DataSetObserver observer) { 2769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int length = mCursors.length; 2779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (int i = 0 ; i < length ; i++) { 2789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mCursors[i] != null) { 2799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mCursors[i].registerDataSetObserver(observer); 2809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void unregisterDataSetObserver(DataSetObserver observer) { 2869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int length = mCursors.length; 2879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (int i = 0 ; i < length ; i++) { 2889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mCursors[i] != null) { 2899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mCursors[i].unregisterDataSetObserver(observer); 2909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean requery() 2969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project { 2979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int length = mCursors.length; 2989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (int i = 0 ; i < length ; i++) { 2999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mCursors[i] == null) continue; 3009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mCursors[i].requery() == false) { 3029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 3039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 3079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 309