content: /*
   * 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.util.construction;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import org.apache.beam.sdk.coders.AtomicCoder;
  import org.apache.beam.sdk.coders.CoderException;
  
  /**
   * Represents a {@coder Coder} that is not defined in Java SDK, for example, a coder that is
   * available in an external SDK that cannot be fully interpretted in the Java SDK.
   */
  public class UnknownCoderWrapper extends AtomicCoder<Object> {
    private String urn;
    private byte[] payload;
  
    private UnknownCoderWrapper(String urn, byte[] payload) {
      this.urn = urn;
      this.payload = payload;
    }
  
    public static UnknownCoderWrapper of(String urn, byte[] payload) {
      return new UnknownCoderWrapper(urn, payload);
    }
  
    @Override
    public void encode(Object value, OutputStream outStream) throws CoderException, IOException {
      throw new CoderException(
          "`UnknownCoderWrapper` was used to perform an actual encoding in the Java SDK. "
              + "Potentially a `PCollection` that was generated by a cross-language transform, "
              + "that uses a coder that is not available in the Java SDK, is being consumed by a Java"
              + " transform. Please make sure that cross-language transforms at the language "
              + "boundary use Beam portable coders.");
    }
  
    @Override
    public Object decode(InputStream inStream) throws CoderException, IOException {
      throw new CoderException(
          "`UnknownCoderWrapper` was used to perform an actual decoding in the Java SDK. "
              + "Potentially a Java transform is being followed by a cross-language transform that "
              + "uses a coder that is not available in the Java SDK. Please make sure that Python "
              + "transforms at the multi-language boundary use Beam portable coders.");
    }
  
    public String getUrn() {
      return urn;
    }
  
    public byte[] getPayload() {
      return payload;
    }
  }
  