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remove experimen

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@hangga 2024-02-14 09:13:05 +07:00
parent 4395131ef0
commit 13209f657c
1 changed files with 0 additions and 79 deletions
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core-java-modules/core-java-uuid/src/test/java/com/baeldung/uuid/UUIDPositiveLongGeneratorUnitTest.java
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@ -1,12 +1,9 @@
package com.baeldung.uuid;
import com.fasterxml.uuid.impl.UUIDUtil;
import org.junit.jupiter.api.Test;
import java.nio.ByteBuffer;
import java.util.UUID;
import static org.apache.commons.io.IOUtils.byteArray;
import static org.assertj.core.api.Assertions.assertThat;
public class UUIDPositiveLongGeneratorUnitTest {
@ -23,80 +20,4 @@ public class UUIDPositiveLongGeneratorUnitTest {
assertThat(randomPositiveLong).isPositive();
}
private byte[] toByteArrayBitwise(UUID uuid) {
long msb = uuid.getMostSignificantBits();
long lsb = uuid.getLeastSignificantBits();
byte[] buffer = new byte[16];
for (int i = 0; i < 8; i++) {
buffer[i] = (byte) (msb >>> 8 * (7 - i));
}
for (int i = 8; i < 16; i++) {
buffer[i] = (byte) (lsb >>> 8 * (7 - i));
}
return buffer;
}
// private byte[] toByteArray(UUID uuid) {
// long msb = uuid.getMostSignificantBits();
// long lsb = uuid.getLeastSignificantBits();
//
// String binaryString = Long.toBinaryString(msb) + Long.toBinaryString(lsb);
//
// // Memastikan panjang string biner menggunakan StringBuilder
// StringBuilder sb = new StringBuilder();
// for (int i = 0; i < 128 - binaryString.length(); i++) {
// sb.append('0');
// }
// sb.append(binaryString);
// String paddedString = sb.toString();
//
// // Mengubah string biner menjadi array byte
// byte[] bytes = new byte[paddedString.length() / 8];
// for (int i = 0; i < bytes.length; i++) {
// String byteString = paddedString.substring(i * 8, (i + 1) * 8);
// bytes[i] = (byte) Integer.parseInt(byteString, 2);
// }
//
// return bytes;
// }
private byte[] toByteArray(UUID uuid) {
long msb = uuid.getMostSignificantBits();
long lsb = uuid.getLeastSignificantBits();
// Menggabungkan most significant bits dan least significant bits menjadi satu nilai long
byte[] uuidBytes = new byte[16];
ByteBuffer.wrap(uuidBytes)
.putLong(msb)
.putLong(lsb);
return uuidBytes;
}
@Test
public void whenGivenUUID_thenVerified() {
for (int i = 0; i < 100; i++) {
UUID uuid = UUID.randomUUID();
byte[] bytes = toByteArray(uuid);
// byte[] bytes = UUIDUtil.asByteArray(uuid);
// assert that byte at index 6 is 0x40 (version 4)
byte byte6 = bytes[6];
assertThat(byte6 & 0xF0).isEqualTo(0x40);
// assert that the byte at index 8 is 0x80 (IETF type variant)
byte byte8 = bytes[8];
assertThat(byte8 & 0xC0).isEqualTo(0x80);
// 1 byte = 8 bites
int totalBites = bytes.length * 8;
// totalBites - 6 (4 bits for version and 2 bits for variant).
int randomBitsCount = totalBites - 6;
// assert that number of random bits is 122
assertThat(randomBitsCount).isEqualTo(122);
}
}
}