/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.beam.sdk.io.gcp.pubsub;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Map;
import org.apache.beam.sdk.coders.ByteArrayCoder;
import org.apache.beam.sdk.coders.Coder;
import org.apache.beam.sdk.coders.CustomCoder;
import org.apache.beam.sdk.coders.MapCoder;
import org.apache.beam.sdk.coders.NullableCoder;
import org.apache.beam.sdk.coders.StringUtf8Coder;
import org.apache.beam.sdk.values.TypeDescriptor;
/** A coder for PubsubMessage including attributes. */
public class PubsubMessageWithAttributesCoder extends CustomCoder<PubsubMessage> {
// A message's payload can not be null
private static final Coder<byte[]> PAYLOAD_CODER = ByteArrayCoder.of();
// A message's attributes can be null.
private static final Coder<Map<String, String>> ATTRIBUTES_CODER =
NullableCoder.of(MapCoder.of(StringUtf8Coder.of(), StringUtf8Coder.of()));
public static Coder<PubsubMessage> of(TypeDescriptor<PubsubMessage> ignored) {
return of();
}
public static PubsubMessageWithAttributesCoder of() {
return new PubsubMessageWithAttributesCoder();
}
@Override
public void encode(PubsubMessage value, OutputStream outStream)
throws IOException {
encode(value, outStream, Context.NESTED);
}
public void encode(PubsubMessage value, OutputStream outStream, Context context)
throws IOException {
PAYLOAD_CODER.encode(value.getPayload(), outStream);
ATTRIBUTES_CODER.encode(value.getAttributeMap(), outStream, context);
}
@Override
public PubsubMessage decode(InputStream inStream) throws IOException {
return decode(inStream, Context.NESTED);
}
@Override
public PubsubMessage decode(InputStream inStream, Context context) throws IOException {
byte[] payload = PAYLOAD_CODER.decode(inStream);
Map<String, String> attributes = ATTRIBUTES_CODER.decode(inStream, context);
return new PubsubMessage(payload, attributes);
}
}