Chiao Cheng | edf7ab9 | 2012-09-14 12:00:21 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2012 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 | |
Gary Mai | 69c182a | 2016-12-05 13:07:03 -0800 | [diff] [blame] | 17 | package com.android.contacts.database; |
Chiao Cheng | edf7ab9 | 2012-09-14 12:00:21 -0700 | [diff] [blame] | 18 | |
| 19 | import android.database.AbstractCursor; |
| 20 | import android.database.CursorIndexOutOfBoundsException; |
| 21 | |
| 22 | /** |
| 23 | * A cursor that is empty. |
| 24 | * <p> |
| 25 | * If you want an empty cursor, this class is better than a MatrixCursor because it has less |
| 26 | * overhead. |
| 27 | */ |
| 28 | final public class EmptyCursor extends AbstractCursor { |
| 29 | |
| 30 | private String[] mColumns; |
| 31 | |
| 32 | public EmptyCursor(String[] columns) { |
| 33 | this.mColumns = columns; |
| 34 | } |
| 35 | |
| 36 | @Override |
| 37 | public int getCount() { |
| 38 | return 0; |
| 39 | } |
| 40 | |
| 41 | @Override |
| 42 | public String[] getColumnNames() { |
| 43 | return mColumns; |
| 44 | } |
| 45 | |
| 46 | @Override |
| 47 | public String getString(int column) { |
| 48 | throw cursorException(); |
| 49 | } |
| 50 | |
| 51 | @Override |
| 52 | public short getShort(int column) { |
| 53 | throw cursorException(); |
| 54 | } |
| 55 | |
| 56 | @Override |
| 57 | public int getInt(int column) { |
| 58 | throw cursorException(); |
| 59 | } |
| 60 | |
| 61 | @Override |
| 62 | public long getLong(int column) { |
| 63 | throw cursorException(); |
| 64 | } |
| 65 | |
| 66 | @Override |
| 67 | public float getFloat(int column) { |
| 68 | throw cursorException(); |
| 69 | } |
| 70 | |
| 71 | @Override |
| 72 | public double getDouble(int column) { |
| 73 | throw cursorException(); |
| 74 | } |
| 75 | |
| 76 | @Override |
| 77 | public boolean isNull(int column) { |
| 78 | throw cursorException(); |
| 79 | } |
| 80 | |
| 81 | private CursorIndexOutOfBoundsException cursorException() { |
| 82 | return new CursorIndexOutOfBoundsException("Operation not permitted on an empty cursor."); |
| 83 | } |
| 84 | } |