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.assertArrayEquals;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  import java.nio.ByteBuffer;
  import java.nio.ByteOrder;
  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.BeforeEach;
  import org.junit.jupiter.api.Test;
  
  public class NativeUtilTest {
  
    private RootAllocator allocator = null;
  
    @BeforeEach
    public void setUp() {
      allocator = new RootAllocator(Long.MAX_VALUE);
    }
  
    @AfterEach
    public void tearDown() {
      allocator.close();
    }
  
    @Test
    public void testString() {
      String javaString = "abc";
      byte[] nativeString = new byte[] {97, 98, 99, 0};
      try (ArrowBuf buffer = NativeUtil.toNativeString(allocator, javaString)) {
        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(nativeString, result);
  
        assertEquals(javaString, NativeUtil.toJavaString(buffer.memoryAddress()));
      }
    }
  
    @Test
    public void testToJavaArray() {
      long[] nativeArray = new long[] {1, 2, 3};
      try (ArrowBuf buffer = allocator.buffer(Long.BYTES * ((long) nativeArray.length), null)) {
        for (long value : nativeArray) {
          buffer.writeLong(value);
        }
        long[] actual = NativeUtil.toJavaArray(buffer.memoryAddress(), nativeArray.length);
        assertArrayEquals(nativeArray, actual);
      }
    }
  
    @Test
    public void testToZeroJavaArray() {
      long[] actual = NativeUtil.toJavaArray(0xDEADBEEF, 0);
      assertEquals(0, actual.length);
    }
  }
  