| /* |
| * Copyright 2016-present Open Networking Foundation |
| * |
| * Licensed 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.onlab.util; |
| |
| import com.google.common.testing.EqualsTester; |
| import org.junit.Test; |
| |
| import java.nio.ByteBuffer; |
| import java.nio.ByteOrder; |
| import java.util.Random; |
| |
| import static org.hamcrest.MatcherAssert.assertThat; |
| import static org.hamcrest.Matchers.equalTo; |
| import static org.hamcrest.Matchers.is; |
| |
| public class ImmutableByteSequenceTest { |
| |
| @Test |
| public void testCopy() throws Exception { |
| |
| byte byteValue = (byte) 1; |
| short shortValue = (short) byteValue; |
| int intValue = (int) byteValue; |
| long longValue = (long) byteValue; |
| byte[] arrayValue = new byte[64]; |
| arrayValue[63] = byteValue; |
| ByteBuffer bufferValue = ByteBuffer.allocate(64).put(arrayValue); |
| |
| ImmutableByteSequence bsByte = ImmutableByteSequence.copyFrom(byteValue); |
| ImmutableByteSequence bsShort = ImmutableByteSequence.copyFrom(shortValue); |
| ImmutableByteSequence bsInt = ImmutableByteSequence.copyFrom(intValue); |
| ImmutableByteSequence bsLong = ImmutableByteSequence.copyFrom(longValue); |
| ImmutableByteSequence bsArray = ImmutableByteSequence.copyFrom(arrayValue); |
| ImmutableByteSequence bsBuffer = ImmutableByteSequence.copyFrom(bufferValue); |
| |
| assertThat("byte sequence of a byte value must have size 1", |
| bsByte.size(), is(equalTo(1))); |
| assertThat("byte sequence of a short value must have size 2", |
| bsShort.size(), is(equalTo(2))); |
| assertThat("byte sequence of an int value must have size 4", |
| bsInt.size(), is(equalTo(4))); |
| assertThat("byte sequence of a long value must have size 8", |
| bsLong.size(), is(equalTo(8))); |
| assertThat("byte sequence of a byte array value must have same size of the array", |
| bsArray.size(), is(equalTo(arrayValue.length))); |
| assertThat("byte sequence of a byte buffer value must have same size of the buffer", |
| bsBuffer.size(), is(equalTo(bufferValue.capacity()))); |
| |
| String errStr = "incorrect byte sequence value"; |
| |
| assertThat(errStr, bsByte.asArray()[0], is(equalTo(byteValue))); |
| assertThat(errStr, bsShort.asArray()[1], is(equalTo(byteValue))); |
| assertThat(errStr, bsInt.asArray()[3], is(equalTo(byteValue))); |
| assertThat(errStr, bsLong.asArray()[7], is(equalTo(byteValue))); |
| assertThat(errStr, bsArray.asArray()[63], is(equalTo(byteValue))); |
| assertThat(errStr, bsBuffer.asArray()[63], is(equalTo(byteValue))); |
| } |
| |
| @Test |
| public void testEndianness() throws Exception { |
| |
| long longValue = new Random().nextLong(); |
| |
| // creates a new sequence from a big-endian buffer |
| ByteBuffer bbBigEndian = ByteBuffer |
| .allocate(8) |
| .order(ByteOrder.BIG_ENDIAN) |
| .putLong(longValue); |
| ImmutableByteSequence bsBufferCopyBigEndian = |
| ImmutableByteSequence.copyFrom(bbBigEndian); |
| |
| // creates a new sequence from a little-endian buffer |
| ByteBuffer bbLittleEndian = ByteBuffer |
| .allocate(8) |
| .order(ByteOrder.LITTLE_ENDIAN) |
| .putLong(longValue); |
| ImmutableByteSequence bsBufferCopyLittleEndian = |
| ImmutableByteSequence.copyFrom(bbLittleEndian); |
| |
| // creates a new sequence from primitive type |
| ImmutableByteSequence bsLongCopy = |
| ImmutableByteSequence.copyFrom(longValue); |
| |
| |
| new EqualsTester() |
| // big-endian byte array cannot be equal to little-endian array |
| .addEqualityGroup(bbBigEndian.array()) |
| .addEqualityGroup(bbLittleEndian.array()) |
| // all byte sequences must be equal |
| .addEqualityGroup(bsBufferCopyBigEndian, |
| bsBufferCopyLittleEndian, |
| bsLongCopy) |
| // byte buffer views of all sequences must be equal |
| .addEqualityGroup(bsBufferCopyBigEndian.asReadOnlyBuffer(), |
| bsBufferCopyLittleEndian.asReadOnlyBuffer(), |
| bsLongCopy.asReadOnlyBuffer()) |
| // byte buffer orders of all sequences must be ByteOrder.BIG_ENDIAN |
| .addEqualityGroup(bsBufferCopyBigEndian.asReadOnlyBuffer().order(), |
| bsBufferCopyLittleEndian.asReadOnlyBuffer().order(), |
| bsLongCopy.asReadOnlyBuffer().order(), |
| ByteOrder.BIG_ENDIAN) |
| .testEquals(); |
| } |
| } |