/**
    * 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.hadoop.hbase.util;
  
  import java.nio.ByteBuffer;
  
  import org.apache.hadoop.hbase.testclassification.SmallTests;
  import org.junit.Assert;
  import org.junit.Test;
  import org.junit.experimental.categories.Category;
  
  @Category(SmallTests.class)
  public class TestSimplePositionedMutableByteRange {
    @Test
    public void testPosition() {
      PositionedByteRange r = new SimplePositionedMutableByteRange(new byte[5], 1, 3);
  
      // exercise single-byte put
      r.put(Bytes.toBytes("f")[0]).put(Bytes.toBytes("o")[0]).put(Bytes.toBytes("o")[0]);
      Assert.assertEquals(3, r.getPosition());
      Assert.assertArrayEquals(
        new byte[] { 0, Bytes.toBytes("f")[0], Bytes.toBytes("o")[0], Bytes.toBytes("o")[0], 0 },
        r.getBytes());
  
      // exercise multi-byte put
      r.setPosition(0);
      r.put(Bytes.toBytes("f")).put(Bytes.toBytes("o")).put(Bytes.toBytes("o"));
      Assert.assertEquals(3, r.getPosition());
      Assert.assertArrayEquals(
        new byte[] { 0, Bytes.toBytes("f")[0], Bytes.toBytes("o")[0], Bytes.toBytes("o")[0], 0 },
        r.getBytes());
  
      // exercise single-byte get
      r.setPosition(0);
      Assert.assertEquals(Bytes.toBytes("f")[0], r.get());
      Assert.assertEquals(Bytes.toBytes("o")[0], r.get());
      Assert.assertEquals(Bytes.toBytes("o")[0], r.get());
  
      r.setPosition(1);
      Assert.assertEquals(Bytes.toBytes("o")[0], r.get());
  
      // exercise multi-byte get
      r.setPosition(0);
      byte[] dst = new byte[3];
      r.get(dst);
      Assert.assertArrayEquals(Bytes.toBytes("foo"), dst);
  
      // set position to the end of the range; this should not throw.
      r.setPosition(3);
    }
  
    @Test
    public void testPutAndGetPrimitiveTypes() {
      PositionedByteRange pbr = new SimplePositionedMutableByteRange(100);
      int i1 = 18, i2 = 2;
      short s1 = 0;
      long l1 = 1234L;
      pbr.putInt(i1);
      pbr.putInt(i2);
      pbr.putShort(s1);
      pbr.putLong(l1);
      pbr.putVLong(0);
      pbr.putVLong(l1);
      pbr.putVLong(Long.MAX_VALUE);
      pbr.putVLong(Long.MIN_VALUE);
      // rewind
      pbr.setPosition(0);
      Assert.assertEquals(i1, pbr.getInt());
      Assert.assertEquals(i2, pbr.getInt());
      Assert.assertEquals(s1, pbr.getShort());
      Assert.assertEquals(l1, pbr.getLong());
      Assert.assertEquals(0, pbr.getVLong());
      Assert.assertEquals(l1, pbr.getVLong());
      Assert.assertEquals(Long.MAX_VALUE, pbr.getVLong());
      Assert.assertEquals(Long.MIN_VALUE, pbr.getVLong());
    }
  
    @Test
    public void testPutGetAPIsCompareWithBBAPIs() {
      // confirm that the long/int/short writing is same as BBs
      PositionedByteRange pbr = new SimplePositionedMutableByteRange(100);
      int i1 = -234, i2 = 2;
      short s1 = 0;
      long l1 = 1234L;
     pbr.putInt(i1);
     pbr.putShort(s1);
     pbr.putInt(i2);
     pbr.putLong(l1);
     // rewind
     pbr.setPosition(0);
     Assert.assertEquals(i1, pbr.getInt());
     Assert.assertEquals(s1, pbr.getShort());
     Assert.assertEquals(i2, pbr.getInt());
     Assert.assertEquals(l1, pbr.getLong());
     // Read back using BB APIs
     ByteBuffer bb = ByteBuffer.wrap(pbr.getBytes());
     Assert.assertEquals(i1, bb.getInt());
     Assert.assertEquals(s1, bb.getShort());
     Assert.assertEquals(i2, bb.getInt());
     Assert.assertEquals(l1, bb.getLong());
   }
 }