# 新 ID 生成器支持 data.center.id 为 0 时的反序列化

commons-spring/src/main/java/cn/quantgroup/tech/util/id/DefaultUidGenerator.java

@@ -123,7 +123,6 @@ public class DefaultUidGenerator implements UidGenerator, InitializingBean {
         }
     }
 
-    // TODO: 2018/3/5 反序列化 uid
     @Override
     public String parseUID(String uidStr) {
         BigInteger bigInteger = new BigInteger(uidStr);
@@ -138,6 +137,9 @@ public class DefaultUidGenerator implements UidGenerator, InitializingBean {
             long sequence = (uid << (totalBits - sequenceBits)) >>> (totalBits - sequenceBits);
             long workerId = (uid << (totalBits - workerIdBits - sequenceBits)) >>> (totalBits - workerIdBits);
             long dataCenterId = (uid << (totalBits - dataCenterIdBits - workerIdBits - sequenceBits)) >>> (totalBits - dataCenterIdBits);
+            if (dataCenterIdBits == 0) {
+                dataCenterId = 0;
+            }
             long deltaSeconds = uid >>> (dataCenterIdBits + workerIdBits + sequenceBits);
             Date thatTime = new Date(TimeUnit.SECONDS.toMillis(epochSeconds + deltaSeconds));
             String thatTimeStr = DateFormatUtils.format(thatTime, DATETIME_PATTERN);
@@ -147,8 +149,11 @@ public class DefaultUidGenerator implements UidGenerator, InitializingBean {
             BigInteger workerBig = getBigIntegerFromLength(workerIdBits).shiftLeft((int) sequenceBits).and(bigInteger);
             System.out.println(workerBig);
             long sequence = getBigIntegerFromLength(sequenceBits).and(bigInteger).longValue();
-            long workerId = getBigIntegerFromLength(workerIdBits).and(bigInteger.shiftRight((int)sequenceBits)).longValue();
-            long dataCenterId = getBigIntegerFromLength(dataCenterIdBits).and(bigInteger.shiftRight((int)sequenceBits+(int)workerIdBits)).longValue();
+            long workerId = getBigIntegerFromLength(workerIdBits).and(bigInteger.shiftRight((int) sequenceBits)).longValue();
+            long dataCenterId = getBigIntegerFromLength(dataCenterIdBits).and(bigInteger.shiftRight((int) sequenceBits + (int) workerIdBits)).longValue();
+            if (dataCenterIdBits == 0) {
+                dataCenterId = 0;
+            }
             long deltaSeconds = bigInteger.shiftRight((int) dataCenterIdBits + (int) workerIdBits + (int) sequenceBits).longValue();
             Date thatTime = new Date(TimeUnit.SECONDS.toMillis(epochSeconds + deltaSeconds));
             String thatTimeStr = DateFormatUtils.format(thatTime, DATETIME_PATTERN);