diff options
Diffstat (limited to 'mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/offline/DownloadCursor.java')
-rw-r--r-- | mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/offline/DownloadCursor.java | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/offline/DownloadCursor.java b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/offline/DownloadCursor.java new file mode 100644 index 0000000000..9693e43002 --- /dev/null +++ b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/offline/DownloadCursor.java @@ -0,0 +1,129 @@ +/* + * 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(); +} |