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.c;
  
  import static org.junit.jupiter.api.Assertions.*;
  
  import java.nio.ByteBuffer;
  import java.nio.ByteOrder;
  import java.util.HashMap;
  import java.util.Map;
  import org.apache.arrow.memory.ArrowBuf;
  import org.apache.arrow.memory.RootAllocator;
  import org.apache.arrow.memory.util.LargeMemoryUtil;
  import org.apache.arrow.memory.util.MemoryUtil;
  import org.junit.jupiter.api.AfterEach;
  import org.junit.jupiter.api.BeforeAll;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  
  public class MetadataTest {
    private RootAllocator allocator = null;
  
    private static Map<String, String> metadata;
    private static byte[] encoded;
  
    @BeforeAll
    static void beforeAll() {
      metadata = new HashMap<>();
      metadata.put("key1", "");
      metadata.put("key2", "bar");
  
      if (ByteOrder.nativeOrder() == ByteOrder.LITTLE_ENDIAN) {
        encoded =
            new byte[] {
              2, 0, 0, 0, 4, 0, 0, 0, 'k', 'e', 'y', '1', 0, 0, 0, 0, 4, 0, 0, 0, 'k', 'e', 'y', '2',
              3, 0, 0, 0, 'b', 'a', 'r'
            };
      } else {
        encoded =
            new byte[] {
              0, 0, 0, 2, 0, 0, 0, 4, 'k', 'e', 'y', '1', 0, 0, 0, 0, 0, 0, 0, 4, 'k', 'e', 'y', '2',
              0, 0, 0, 3, 'b', 'a', 'r'
            };
      }
    }
  
    @BeforeEach
    public void setUp() {
      allocator = new RootAllocator(Long.MAX_VALUE);
    }
  
    @AfterEach
    public void tearDown() {
      allocator.close();
    }
  
    @Test
    public void testEncode() {
      try (ArrowBuf buffer = Metadata.encode(allocator, metadata)) {
        int totalSize = LargeMemoryUtil.checkedCastToInt(buffer.readableBytes());
        ByteBuffer reader =
            MemoryUtil.directBuffer(buffer.memoryAddress(), totalSize).order(ByteOrder.nativeOrder());
        byte[] result = new byte[totalSize];
        reader.get(result);
        assertArrayEquals(encoded, result);
      }
    }
  
    @Test
    public void testDecode() {
      try (ArrowBuf buffer = allocator.buffer(31)) {
        buffer.setBytes(0, encoded);
        Map<String, String> decoded = Metadata.decode(buffer.memoryAddress());
        assertNotNull(decoded);
        assertEquals(metadata, decoded);
      }
    }
  
    @Test
    public void testEncodeEmpty() {
      Map<String, String> metadata = new HashMap<>();
      try (ArrowBuf encoded = Metadata.encode(allocator, metadata)) {
        assertNull(encoded);
      }
    }
  
    @Test
    public void testDecodeEmpty() {
      Map<String, String> decoded = Metadata.decode(NativeUtil.NULL);
      assertNull(decoded);
    }
  }
  