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Code Issues Releases Wiki Activity

Rewrite setIndex(int) to pass unit tests

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Original did not cover the case of when streams is empty and
documentation does not specify any input restrictions.

There's an ambiguity with broadcasting an event between the
documentation and the actual code (see TODO).
This commit is contained in:
Eric Xu 2021-05-21 23:33:23 -04:00 committed by Zhiheng Xu
parent 8d0f2d371d
commit 775fbc9a75
1 changed files with 23 additions and 5 deletions
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28
app/src/main/java/org/schabi/newpipe/player/playqueue/PlayQueue.java
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@ -135,18 +135,36 @@ public abstract class PlayQueue implements Serializable {
public synchronized void setIndex(final int index) {
final int oldIndex = getIndex();
int newIndex = index;
final int newIndex;
if (index < 0) {
newIndex = 0;
} else if (index < streams.size()) {
// Regular assignment for index in bounds
newIndex = index;
} else if (streams.isEmpty()) {
// Out of bounds from here on
// Need to check if stream is empty to prevent arithmetic error and negative index
newIndex = 0;
} else if (isComplete()) {
// Circular indexing
newIndex = index % streams.size();
} else {
// Index of last element
newIndex = streams.size() - 1;
}
if (index >= streams.size()) {
newIndex = isComplete() ? index % streams.size() : streams.size() - 1;
}
queueIndex.set(newIndex);
if (oldIndex != newIndex) {
history.add(streams.get(newIndex));
}
queueIndex.set(newIndex);
/*
TODO: Documentation states that a SelectEvent will only be emitted if the new index is...
different from the old one but this is emitted regardless? Not sure what this what it does
exactly so I won't touch it
*/
broadcast(new SelectEvent(oldIndex, newIndex));
}