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// Copyright 2019 The Bazel Authors. All rights reserved.
//
// 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 com.google.devtools.build.lib.util.io;
import com.google.common.base.Preconditions;
import com.google.protobuf.Message;
import com.google.protobuf.util.JsonFormat;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
/** Creating a MessageOutputStream from an OutputStream */
public class MessageOutputStreamWrapper {
/** Outputs the messages in binary format */
public static class BinaryOutputStreamWrapper implements MessageOutputStream {
private final OutputStream stream;
public BinaryOutputStreamWrapper(OutputStream stream) {
this.stream = Preconditions.checkNotNull(stream);
}
@Override
public void write(Message m) throws IOException {
Preconditions.checkNotNull(m);
m.writeDelimitedTo(stream);
}
@Override
public void close() throws IOException {
stream.close();
}
}
/** Outputs the messages in JSON text format */
public static class JsonOutputStreamWrapper implements MessageOutputStream {
private final OutputStream stream;
private final JsonFormat.Printer printer = JsonFormat.printer().includingDefaultValueFields();
public JsonOutputStreamWrapper(OutputStream stream) {
Preconditions.checkNotNull(stream);
this.stream = stream;
}
@Override
public void write(Message m) throws IOException {
Preconditions.checkNotNull(m);
stream.write(printer.print(m).getBytes(StandardCharsets.UTF_8));
}
@Override
public void close() throws IOException {
stream.close();
}
}
/** Outputs the messages in JSON text format */
public static class MessageOutputStreamCollection implements MessageOutputStream {
private final ArrayList<MessageOutputStream> streams = new ArrayList<>();
public boolean isEmpty() {
return streams.isEmpty();
}
public void addStream(MessageOutputStream m) {
streams.add(m);
}
@Override
public void write(Message m) throws IOException {
for (MessageOutputStream stream : streams) {
stream.write(m);
}
}
@Override
public void close() throws IOException {
IOException firstException = null;
for (MessageOutputStream stream : streams) {
try {
stream.close();
} catch (IOException e) {
if (firstException == null) {
firstException = e;
} else {
firstException.addSuppressed(e);
}
}
}
if (firstException != null) {
throw firstException;
}
}
}
}