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/*
* Copyright (C) 2018 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.source.chunk;
import org.mozilla.thirdparty.com.google.android.exoplayer2.upstream.DataSpec;
import java.util.NoSuchElementException;
/**
* Iterator for media chunk sequences.
*
* <p>The iterator initially points in front of the first available element. The first call to
* {@link #next()} moves the iterator to the first element. Check the return value of {@link
* #next()} or {@link #isEnded()} to determine whether the iterator reached the end of the available
* data.
*/
public interface MediaChunkIterator {
/** An empty media chunk iterator without available data. */
MediaChunkIterator EMPTY =
new MediaChunkIterator() {
@Override
public boolean isEnded() {
return true;
}
@Override
public boolean next() {
return false;
}
@Override
public DataSpec getDataSpec() {
throw new NoSuchElementException();
}
@Override
public long getChunkStartTimeUs() {
throw new NoSuchElementException();
}
@Override
public long getChunkEndTimeUs() {
throw new NoSuchElementException();
}
@Override
public void reset() {
// Do nothing.
}
};
/** Returns whether the iteration has reached the end of the available data. */
boolean isEnded();
/**
* Moves the iterator to the next media chunk.
*
* <p>Check the return value or {@link #isEnded()} to determine whether the iterator reached the
* end of the available data.
*
* @return Whether the iterator points to a media chunk with available data.
*/
boolean next();
/**
* Returns the {@link DataSpec} used to load the media chunk.
*
* @throws java.util.NoSuchElementException If the method is called before the first call to
* {@link #next()} or when {@link #isEnded()} is true.
*/
DataSpec getDataSpec();
/**
* Returns the media start time of the chunk, in microseconds.
*
* @throws java.util.NoSuchElementException If the method is called before the first call to
* {@link #next()} or when {@link #isEnded()} is true.
*/
long getChunkStartTimeUs();
/**
* Returns the media end time of the chunk, in microseconds.
*
* @throws java.util.NoSuchElementException If the method is called before the first call to
* {@link #next()} or when {@link #isEnded()} is true.
*/
long getChunkEndTimeUs();
/** Resets the iterator to the initial position. */
void reset();
}
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