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/*
* Copyright (C) 2016 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.upstream;
import android.net.Uri;
import androidx.annotation.Nullable;
import org.mozilla.thirdparty.com.google.android.exoplayer2.C;
import org.mozilla.thirdparty.com.google.android.exoplayer2.ParserException;
import org.mozilla.thirdparty.com.google.android.exoplayer2.upstream.Loader.Loadable;
import org.mozilla.thirdparty.com.google.android.exoplayer2.util.Assertions;
import org.mozilla.thirdparty.com.google.android.exoplayer2.util.Util;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
import java.util.Map;
/**
* A {@link Loadable} for objects that can be parsed from binary data using a {@link Parser}.
*
* @param <T> The type of the object being loaded.
*/
public final class ParsingLoadable<T> implements Loadable {
/**
* Parses an object from loaded data.
*/
public interface Parser<T> {
/**
* Parses an object from a response.
*
* @param uri The source {@link Uri} of the response, after any redirection.
* @param inputStream An {@link InputStream} from which the response data can be read.
* @return The parsed object.
* @throws ParserException If an error occurs parsing the data.
* @throws IOException If an error occurs reading data from the stream.
*/
T parse(Uri uri, InputStream inputStream) throws IOException;
}
/**
* Loads a single parsable object.
*
* @param dataSource The {@link DataSource} through which the object should be read.
* @param parser The {@link Parser} to parse the object from the response.
* @param uri The {@link Uri} of the object to read.
* @param type The type of the data. One of the {@link C}{@code DATA_TYPE_*} constants.
* @return The parsed object
* @throws IOException Thrown if there is an error while loading or parsing.
*/
public static <T> T load(DataSource dataSource, Parser<? extends T> parser, Uri uri, int type)
throws IOException {
ParsingLoadable<T> loadable = new ParsingLoadable<>(dataSource, uri, type, parser);
loadable.load();
return Assertions.checkNotNull(loadable.getResult());
}
/**
* Loads a single parsable object.
*
* @param dataSource The {@link DataSource} through which the object should be read.
* @param parser The {@link Parser} to parse the object from the response.
* @param dataSpec The {@link DataSpec} of the object to read.
* @param type The type of the data. One of the {@link C}{@code DATA_TYPE_*} constants.
* @return The parsed object
* @throws IOException Thrown if there is an error while loading or parsing.
*/
public static <T> T load(
DataSource dataSource, Parser<? extends T> parser, DataSpec dataSpec, int type)
throws IOException {
ParsingLoadable<T> loadable = new ParsingLoadable<>(dataSource, dataSpec, type, parser);
loadable.load();
return Assertions.checkNotNull(loadable.getResult());
}
/**
* The {@link DataSpec} that defines the data to be loaded.
*/
public final DataSpec dataSpec;
/**
* The type of the data. One of the {@code DATA_TYPE_*} constants defined in {@link C}. For
* reporting only.
*/
public final int type;
private final StatsDataSource dataSource;
private final Parser<? extends T> parser;
private volatile @Nullable T result;
/**
* @param dataSource A {@link DataSource} to use when loading the data.
* @param uri The {@link Uri} from which the object should be loaded.
* @param type See {@link #type}.
* @param parser Parses the object from the response.
*/
public ParsingLoadable(DataSource dataSource, Uri uri, int type, Parser<? extends T> parser) {
this(dataSource, new DataSpec(uri, DataSpec.FLAG_ALLOW_GZIP), type, parser);
}
/**
* @param dataSource A {@link DataSource} to use when loading the data.
* @param dataSpec The {@link DataSpec} from which the object should be loaded.
* @param type See {@link #type}.
* @param parser Parses the object from the response.
*/
public ParsingLoadable(DataSource dataSource, DataSpec dataSpec, int type,
Parser<? extends T> parser) {
this.dataSource = new StatsDataSource(dataSource);
this.dataSpec = dataSpec;
this.type = type;
this.parser = parser;
}
/** Returns the loaded object, or null if an object has not been loaded. */
public final @Nullable T getResult() {
return result;
}
/**
* Returns the number of bytes loaded. In the case that the network response was compressed, the
* value returned is the size of the data <em>after</em> decompression. Must only be called after
* the load completed, failed, or was canceled.
*/
public long bytesLoaded() {
return dataSource.getBytesRead();
}
/**
* Returns the {@link Uri} from which data was read. If redirection occurred, this is the
* redirected uri. Must only be called after the load completed, failed, or was canceled.
*/
public Uri getUri() {
return dataSource.getLastOpenedUri();
}
/**
* Returns the response headers associated with the load. Must only be called after the load
* completed, failed, or was canceled.
*/
public Map<String, List<String>> getResponseHeaders() {
return dataSource.getLastResponseHeaders();
}
@Override
public final void cancelLoad() {
// Do nothing.
}
@Override
public final void load() throws IOException {
// We always load from the beginning, so reset bytesRead to 0.
dataSource.resetBytesRead();
DataSourceInputStream inputStream = new DataSourceInputStream(dataSource, dataSpec);
try {
inputStream.open();
Uri dataSourceUri = Assertions.checkNotNull(dataSource.getUri());
result = parser.parse(dataSourceUri, inputStream);
} finally {
Util.closeQuietly(inputStream);
}
}
}
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