PlaceholderDataSource.java
/*
* Copyright (C) 2017 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 androidx.media3.datasource;
import android.net.Uri;
import androidx.annotation.Nullable;
import androidx.media3.common.util.UnstableApi;
import java.io.IOException;
/** A DataSource which provides no data. {@link #open(DataSpec)} throws {@link IOException}. */
@UnstableApi
public final class PlaceholderDataSource implements DataSource {
public static final PlaceholderDataSource INSTANCE = new PlaceholderDataSource();
/** A factory that produces {@link PlaceholderDataSource}. */
public static final Factory FACTORY = PlaceholderDataSource::new;
private PlaceholderDataSource() {}
@Override
public void addTransferListener(TransferListener transferListener) {
// Do nothing.
}
@Override
public long open(DataSpec dataSpec) throws IOException {
throw new IOException("PlaceholderDataSource cannot be opened");
}
@Override
public int read(byte[] buffer, int offset, int length) {
throw new UnsupportedOperationException();
}
@Override
@Nullable
public Uri getUri() {
return null;
}
@Override
public void close() {
// do nothing.
}
}