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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 java.lang.reflect.Constructor;
import java.util.List;
/**
* Default {@link DownloaderFactory}, supporting creation of progressive, DASH, HLS and
* SmoothStreaming downloaders. Note that for the latter three, the corresponding library module
* must be built into the application.
*/
public class DefaultDownloaderFactory implements DownloaderFactory {
@Nullable private static final Constructor<? extends Downloader> DASH_DOWNLOADER_CONSTRUCTOR;
@Nullable private static final Constructor<? extends Downloader> HLS_DOWNLOADER_CONSTRUCTOR;
@Nullable private static final Constructor<? extends Downloader> SS_DOWNLOADER_CONSTRUCTOR;
static {
Constructor<? extends Downloader> dashDownloaderConstructor = null;
try {
// LINT.IfChange
dashDownloaderConstructor =
getDownloaderConstructor(
Class.forName("com.google.android.exoplayer2.source.dash.offline.DashDownloader"));
// LINT.ThenChange(../../../../../../../../proguard-rules.txt)
} catch (ClassNotFoundException e) {
// Expected if the app was built without the DASH module.
}
DASH_DOWNLOADER_CONSTRUCTOR = dashDownloaderConstructor;
Constructor<? extends Downloader> hlsDownloaderConstructor = null;
try {
// LINT.IfChange
hlsDownloaderConstructor =
getDownloaderConstructor(
Class.forName("com.google.android.exoplayer2.source.hls.offline.HlsDownloader"));
// LINT.ThenChange(../../../../../../../../proguard-rules.txt)
} catch (ClassNotFoundException e) {
// Expected if the app was built without the HLS module.
}
HLS_DOWNLOADER_CONSTRUCTOR = hlsDownloaderConstructor;
Constructor<? extends Downloader> ssDownloaderConstructor = null;
try {
// LINT.IfChange
ssDownloaderConstructor =
getDownloaderConstructor(
Class.forName(
"com.google.android.exoplayer2.source.smoothstreaming.offline.SsDownloader"));
// LINT.ThenChange(../../../../../../../../proguard-rules.txt)
} catch (ClassNotFoundException e) {
// Expected if the app was built without the SmoothStreaming module.
}
SS_DOWNLOADER_CONSTRUCTOR = ssDownloaderConstructor;
}
private final DownloaderConstructorHelper downloaderConstructorHelper;
/** @param downloaderConstructorHelper A helper for instantiating downloaders. */
public DefaultDownloaderFactory(DownloaderConstructorHelper downloaderConstructorHelper) {
this.downloaderConstructorHelper = downloaderConstructorHelper;
}
@Override
public Downloader createDownloader(DownloadRequest request) {
switch (request.type) {
case DownloadRequest.TYPE_PROGRESSIVE:
return new ProgressiveDownloader(
request.uri, request.customCacheKey, downloaderConstructorHelper);
case DownloadRequest.TYPE_DASH:
return createDownloader(request, DASH_DOWNLOADER_CONSTRUCTOR);
case DownloadRequest.TYPE_HLS:
return createDownloader(request, HLS_DOWNLOADER_CONSTRUCTOR);
case DownloadRequest.TYPE_SS:
return createDownloader(request, SS_DOWNLOADER_CONSTRUCTOR);
default:
throw new IllegalArgumentException("Unsupported type: " + request.type);
}
}
private Downloader createDownloader(
DownloadRequest request, @Nullable Constructor<? extends Downloader> constructor) {
if (constructor == null) {
throw new IllegalStateException("Module missing for: " + request.type);
}
try {
return constructor.newInstance(request.uri, request.streamKeys, downloaderConstructorHelper);
} catch (Exception e) {
throw new RuntimeException("Failed to instantiate downloader for: " + request.type, e);
}
}
// LINT.IfChange
private static Constructor<? extends Downloader> getDownloaderConstructor(Class<?> clazz) {
try {
return clazz
.asSubclass(Downloader.class)
.getConstructor(Uri.class, List.class, DownloaderConstructorHelper.class);
} catch (NoSuchMethodException e) {
// The downloader is present, but the expected constructor is missing.
throw new RuntimeException("Downloader constructor missing", e);
}
}
// LINT.ThenChange(../../../../../../../../proguard-rules.txt)
}
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