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.vector.util;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  import java.math.BigDecimal;
  import java.math.BigInteger;
  import org.apache.arrow.memory.ArrowBuf;
  import org.apache.arrow.memory.BufferAllocator;
  import org.apache.arrow.memory.RootAllocator;
  import org.junit.jupiter.api.Test;
  
  public class DecimalUtilityTest {
    private static final BigInteger[] MAX_BIG_INT =
        new BigInteger[] {
          BigInteger.valueOf(10).pow(38).subtract(java.math.BigInteger.ONE),
          java.math.BigInteger.valueOf(10).pow(76)
        };
    private static final BigInteger[] MIN_BIG_INT =
        new BigInteger[] {
          MAX_BIG_INT[0].multiply(BigInteger.valueOf(-1)),
          MAX_BIG_INT[1].multiply(BigInteger.valueOf(-1))
        };
  
    @Test
    public void testSetLongInDecimalArrowBuf() {
      int[] byteLengths = new int[] {16, 32};
      for (int x = 0; x < 2; x++) {
        try (BufferAllocator allocator = new RootAllocator(128);
            ArrowBuf buf = allocator.buffer(byteLengths[x]); ) {
          int[] intValues = new int[] {Integer.MAX_VALUE, Integer.MIN_VALUE, 0};
          for (int val : intValues) {
            buf.clear();
            DecimalUtility.writeLongToArrowBuf((long) val, buf, 0, byteLengths[x]);
            BigDecimal actual = DecimalUtility.getBigDecimalFromArrowBuf(buf, 0, 0, byteLengths[x]);
            BigDecimal expected = BigDecimal.valueOf(val);
            assertEquals(expected, actual);
          }
        }
      }
    }
  
    @Test
    public void testSetByteArrayInDecimalArrowBuf() {
      int[] byteLengths = new int[] {16, 32};
      for (int x = 0; x < 2; x++) {
        try (BufferAllocator allocator = new RootAllocator(128);
            ArrowBuf buf = allocator.buffer(byteLengths[x]); ) {
          int[] intValues = new int[] {Integer.MAX_VALUE, Integer.MIN_VALUE, 0};
          for (int val : intValues) {
            buf.clear();
            DecimalUtility.writeByteArrayToArrowBuf(
                BigInteger.valueOf(val).toByteArray(), buf, 0, byteLengths[x]);
            BigDecimal actual = DecimalUtility.getBigDecimalFromArrowBuf(buf, 0, 0, byteLengths[x]);
            BigDecimal expected = BigDecimal.valueOf(val);
            assertEquals(expected, actual);
          }
  
          long[] longValues = new long[] {Long.MIN_VALUE, 0, Long.MAX_VALUE};
          for (long val : longValues) {
            buf.clear();
            DecimalUtility.writeByteArrayToArrowBuf(
                BigInteger.valueOf(val).toByteArray(), buf, 0, byteLengths[x]);
            BigDecimal actual = DecimalUtility.getBigDecimalFromArrowBuf(buf, 0, 0, byteLengths[x]);
            BigDecimal expected = BigDecimal.valueOf(val);
            assertEquals(expected, actual);
          }
  
          BigInteger[] decimals =
              new BigInteger[] {MAX_BIG_INT[x], new BigInteger("0"), MIN_BIG_INT[x]};
          for (BigInteger val : decimals) {
            buf.clear();
            DecimalUtility.writeByteArrayToArrowBuf(val.toByteArray(), buf, 0, byteLengths[x]);
            BigDecimal actual = DecimalUtility.getBigDecimalFromArrowBuf(buf, 0, 0, byteLengths[x]);
            BigDecimal expected = new BigDecimal(val);
            assertEquals(expected, actual);
          }
        }
      }
    }
  
    @Test
    public void testSetBigDecimalInDecimalArrowBuf() {
      int[] byteLengths = new int[] {16, 32};
      for (int x = 0; x < 2; x++) {
        try (BufferAllocator allocator = new RootAllocator(128);
            ArrowBuf buf = allocator.buffer(byteLengths[x]); ) {
          int[] intValues = new int[] {Integer.MAX_VALUE, Integer.MIN_VALUE, 0};
          for (int val : intValues) {
            buf.clear();
            DecimalUtility.writeBigDecimalToArrowBuf(BigDecimal.valueOf(val), buf, 0, byteLengths[x]);
            BigDecimal actual = DecimalUtility.getBigDecimalFromArrowBuf(buf, 0, 0, byteLengths[x]);
            BigDecimal expected = BigDecimal.valueOf(val);
            assertEquals(expected, actual);
          }
  
          long[] longValues = new long[] {Long.MIN_VALUE, 0, Long.MAX_VALUE};
          for (long val : longValues) {
            buf.clear();
            DecimalUtility.writeBigDecimalToArrowBuf(BigDecimal.valueOf(val), buf, 0, byteLengths[x]);
            BigDecimal actual = DecimalUtility.getBigDecimalFromArrowBuf(buf, 0, 0, byteLengths[x]);
            BigDecimal expected = BigDecimal.valueOf(val);
            assertEquals(expected, actual);
          }
  
          BigInteger[] decimals =
              new BigInteger[] {MAX_BIG_INT[x], new BigInteger("0"), MIN_BIG_INT[x]};
          for (BigInteger val : decimals) {
            buf.clear();
            DecimalUtility.writeBigDecimalToArrowBuf(new BigDecimal(val), buf, 0, byteLengths[x]);
            BigDecimal actual = DecimalUtility.getBigDecimalFromArrowBuf(buf, 0, 0, byteLengths[x]);
            BigDecimal expected = new BigDecimal(val);
            assertEquals(expected, actual);
          }
        }
      }
    }
  }
  