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.arrow.flight;
  
  import com.google.common.collect.Iterables;
  import com.google.common.collect.LinkedListMultimap;
  import com.google.common.collect.Multimap;
  import java.nio.charset.StandardCharsets;
  import java.util.Set;
  import java.util.stream.Collectors;
  import java.util.stream.StreamSupport;
  
  /** metadata container specific to the binary metadata held in the grpc trailer. */
  public class ErrorFlightMetadata implements CallHeaders {
    private final Multimap<String, byte[]> metadata = LinkedListMultimap.create();
  
    public ErrorFlightMetadata() {}
  
    @Override
    public String get(String key) {
      return new String(getByte(key), StandardCharsets.US_ASCII);
    }
  
    @Override
    public byte[] getByte(String key) {
      return Iterables.getLast(metadata.get(key));
    }
  
    @Override
    public Iterable<String> getAll(String key) {
      return StreamSupport.stream(getAllByte(key).spliterator(), false)
          .map(b -> new String(b, StandardCharsets.US_ASCII))
          .collect(Collectors.toList());
    }
  
    @Override
    public Iterable<byte[]> getAllByte(String key) {
      return metadata.get(key);
    }
  
    @Override
    public void insert(String key, String value) {
      metadata.put(key, value.getBytes(StandardCharsets.UTF_8));
    }
  
    @Override
    public void insert(String key, byte[] value) {
      metadata.put(key, value);
    }
  
    @Override
    public Set<String> keys() {
      return metadata.keySet();
    }
  
    @Override
    public boolean containsKey(String key) {
      return metadata.containsKey(key);
    }
  }
  