blob: 9693e43002316e6b1a80e0ea64a32e48eac580f2 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
|
/*
* Copyright (C) 2019 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.mozilla.thirdparty.com.google.android.exoplayer2.offline;
import java.io.Closeable;
/** Provides random read-write access to the result set returned by a database query. */
public interface DownloadCursor extends Closeable {
/** Returns the download at the current position. */
Download getDownload();
/** Returns the numbers of downloads in the cursor. */
int getCount();
/**
* Returns the current position of the cursor in the download set. The value is zero-based. When
* the download set is first returned the cursor will be at positon -1, which is before the first
* download. After the last download is returned another call to next() will leave the cursor past
* the last entry, at a position of count().
*
* @return the current cursor position.
*/
int getPosition();
/**
* Move the cursor to an absolute position. The valid range of values is -1 <= position <=
* count.
*
* <p>This method will return true if the request destination was reachable, otherwise, it returns
* false.
*
* @param position the zero-based position to move to.
* @return whether the requested move fully succeeded.
*/
boolean moveToPosition(int position);
/**
* Move the cursor to the first download.
*
* <p>This method will return false if the cursor is empty.
*
* @return whether the move succeeded.
*/
default boolean moveToFirst() {
return moveToPosition(0);
}
/**
* Move the cursor to the last download.
*
* <p>This method will return false if the cursor is empty.
*
* @return whether the move succeeded.
*/
default boolean moveToLast() {
return moveToPosition(getCount() - 1);
}
/**
* Move the cursor to the next download.
*
* <p>This method will return false if the cursor is already past the last entry in the result
* set.
*
* @return whether the move succeeded.
*/
default boolean moveToNext() {
return moveToPosition(getPosition() + 1);
}
/**
* Move the cursor to the previous download.
*
* <p>This method will return false if the cursor is already before the first entry in the result
* set.
*
* @return whether the move succeeded.
*/
default boolean moveToPrevious() {
return moveToPosition(getPosition() - 1);
}
/** Returns whether the cursor is pointing to the first download. */
default boolean isFirst() {
return getPosition() == 0 && getCount() != 0;
}
/** Returns whether the cursor is pointing to the last download. */
default boolean isLast() {
int count = getCount();
return getPosition() == (count - 1) && count != 0;
}
/** Returns whether the cursor is pointing to the position before the first download. */
default boolean isBeforeFirst() {
if (getCount() == 0) {
return true;
}
return getPosition() == -1;
}
/** Returns whether the cursor is pointing to the position after the last download. */
default boolean isAfterLast() {
if (getCount() == 0) {
return true;
}
return getPosition() == getCount();
}
/** Returns whether the cursor is closed */
boolean isClosed();
@Override
void close();
}
|
