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.testing;
  
  import com.fasterxml.jackson.core.JsonGenerator;
  import com.fasterxml.jackson.core.JsonProcessingException;
  import com.fasterxml.jackson.databind.JsonSerializer;
  import com.fasterxml.jackson.databind.SerializerProvider;
  import java.io.IOException;
  import org.apache.beam.sdk.util.SerializableUtils;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.io.BaseEncoding;
  
  /** MatcherSerializer is used with Jackson to enable serialization of SerializableMatchers. */
  class MatcherSerializer extends JsonSerializer<SerializableMatcher<?>> {
    @Override
    public void serialize(
        SerializableMatcher<?> matcher,
        JsonGenerator jsonGenerator,
        SerializerProvider serializerProvider)
        throws IOException, JsonProcessingException {
      byte[] out = SerializableUtils.serializeToByteArray(matcher);
      String encodedString = BaseEncoding.base64().encode(out);
      jsonGenerator.writeStartObject();
      jsonGenerator.writeStringField("matcher", encodedString);
      jsonGenerator.writeEndObject();
    }
  }
  