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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.offline;
import android.net.Uri;
import androidx.annotation.Nullable;
import org.mozilla.thirdparty.com.google.android.exoplayer2.upstream.ParsingLoadable.Parser;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
/**
* A manifest parser that includes only the streams identified by the given stream keys.
*
* @param <T> The {@link FilterableManifest} type.
*/
public final class FilteringManifestParser<T extends FilterableManifest<T>> implements Parser<T> {
private final Parser<? extends T> parser;
@Nullable private final List<StreamKey> streamKeys;
/**
* @param parser A parser for the manifest that will be filtered.
* @param streamKeys The stream keys. If null or empty then filtering will not occur.
*/
public FilteringManifestParser(Parser<? extends T> parser, @Nullable List<StreamKey> streamKeys) {
this.parser = parser;
this.streamKeys = streamKeys;
}
@Override
public T parse(Uri uri, InputStream inputStream) throws IOException {
T manifest = parser.parse(uri, inputStream);
return streamKeys == null || streamKeys.isEmpty() ? manifest : manifest.copy(streamKeys);
}
}
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