/*
 * 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.nio;

import static org.junit.Assert.assertEquals;

import java.nio.ByteBuffer;
import org.apache.hadoop.hbase.HBaseClassTestRule;
import org.apache.hadoop.hbase.testclassification.MiscTests;
import org.apache.hadoop.hbase.testclassification.SmallTests;
import org.junit.ClassRule;
import org.junit.Test;
import org.junit.experimental.categories.Category;

@Category({ MiscTests.class, SmallTests.class })
public class TestSingleByteBuff {

  @ClassRule
  public static final HBaseClassTestRule CLASS_RULE =
    HBaseClassTestRule.forClass(TestSingleByteBuff.class);

  @Test
  public void testPositionalReads() {
    // Off heap buffer
    testPositionalReads(ByteBuffer.allocateDirect(15));
    // On heap buffer
    testPositionalReads(ByteBuffer.allocate(15));
  }

  private void testPositionalReads(ByteBuffer bb) {
    int i = 9;
    short s = 5;
    byte b = 2;
    long l = 1234L;
    bb.putInt(i);
    bb.putLong(l);
    bb.put(b);
    bb.putShort(s);
    SingleByteBuff sbb = new SingleByteBuff(bb);
    assertEquals(i, sbb.getInt(0));
    assertEquals(l, sbb.getLong(4));
    assertEquals(b, sbb.get(12));
    assertEquals(s, sbb.getShort(13));
    sbb.rewind();
    assertEquals(i, sbb.getIntAfterPosition(0));
    assertEquals(l, sbb.getLongAfterPosition(4));
    assertEquals(b, sbb.getByteAfterPosition(12));
    assertEquals(s, sbb.getShortAfterPosition(13));
  }
}
