Fix regression caused by #1337

src/main/java/com/zaxxer/hikari/util/IsolationLevel.java

@@ -1,7 +1,23 @@
-package com.zaxxer.hikari.util;
+/*
+ * Copyright (C) 2019 Brett Wooldridge
+ *
+ * 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.
+ */
 
-public enum IsolationLevel {
+package com.zaxxer.hikari.util;
 
+public enum IsolationLevel
+{
    TRANSACTION_NONE(0),
    TRANSACTION_READ_UNCOMMITTED(1),
    TRANSACTION_READ_COMMITTED(2),

src/main/java/com/zaxxer/hikari/util/UtilityElf.java

@@ -16,17 +16,12 @@
 
 package com.zaxxer.hikari.util;
 
-import static java.lang.Thread.currentThread;
-import static java.util.concurrent.TimeUnit.SECONDS;
-
 import java.lang.reflect.Constructor;
 import java.util.Locale;
-import java.util.Optional;
-import java.util.concurrent.BlockingQueue;
-import java.util.concurrent.LinkedBlockingQueue;
-import java.util.concurrent.RejectedExecutionHandler;
-import java.util.concurrent.ThreadFactory;
-import java.util.concurrent.ThreadPoolExecutor;
+import java.util.concurrent.*;
+
+import static java.lang.Thread.currentThread;
+import static java.util.concurrent.TimeUnit.SECONDS;
 
 /**
  *
@@ -34,11 +29,6 @@ import java.util.concurrent.ThreadPoolExecutor;
  */
 public final class UtilityElf
 {
-   /**
-    * A constant for SQL Server's Snapshot isolation level
-    */
-   private static final int SQL_SERVER_SNAPSHOT_ISOLATION_LEVEL = 4096;
-
    /**
     *
     * @return null if string is null or empty
@@ -164,14 +154,28 @@ public final class UtilityElf
     * @param transactionIsolationName the name of the transaction isolation level
     * @return the int value of the isolation level or -1
     */
-   public static int getTransactionIsolation(final String transactionIsolationName) {
+   public static int getTransactionIsolation(final String transactionIsolationName)
+   {
       if (transactionIsolationName != null) {
          try {
             // use the english locale to avoid the infamous turkish locale bug
             final String upperCaseIsolationLevelName = transactionIsolationName.toUpperCase(Locale.ENGLISH);
             return IsolationLevel.valueOf(upperCaseIsolationLevelName).getLevelId();
-         } catch (Exception e) {
-            throw new IllegalArgumentException("Invalid transaction isolation value: " + transactionIsolationName);
+         } catch (IllegalArgumentException e) {
+            // legacy support for passing an integer version of the isolation level
+            try {
+               final int level = Integer.parseInt(transactionIsolationName);
+               for (IsolationLevel iso : IsolationLevel.values()) {
+                  if (iso.getLevelId() == level) {
+                     return iso.getLevelId();
+                  }
+               }
+
+               throw new IllegalArgumentException("Invalid transaction isolation value: " + transactionIsolationName);
+            }
+            catch (NumberFormatException nfe) {
+               throw new IllegalArgumentException("Invalid transaction isolation value: " + transactionIsolationName, nfe);
+            }
          }
       }
 

src/test/java/com/zaxxer/hikari/util/UtilityElfTest.java

@@ -1,14 +1,30 @@
+/*
+ * Copyright (C) 2013, 2019 Brett Wooldridge
+ *
+ * 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 com.zaxxer.hikari.util;
 
 import org.junit.Test;
 
 import static org.junit.Assert.assertEquals;
 
-
-public class UtilityElfTest {
-
+public class UtilityElfTest
+{
    @Test
-   public void shouldReturnValidTransactionIsolationLevel() {
+   public void shouldReturnValidTransactionIsolationLevel()
+   {
       //Act
       int expectedLevel = UtilityElf.getTransactionIsolation("TRANSACTION_SQL_SERVER_SNAPSHOT_ISOLATION_LEVEL");
 
@@ -16,10 +32,24 @@ public class UtilityElfTest {
       assertEquals(expectedLevel, 4096);
    }
 
-
    @Test(expected = IllegalArgumentException.class)
-   public void shouldThrowWhenInvalidTransactionNameGiven() {
+   public void shouldThrowWhenInvalidTransactionNameGiven()
+   {
       //Act
       UtilityElf.getTransactionIsolation("INVALID_TRANSACTION");
    }
+
+   @Test
+   public void shouldReturnTransationIsolationLevelFromInteger()
+   {
+      int expectedLevel = UtilityElf.getTransactionIsolation("4096");
+      assertEquals(expectedLevel, 4096);
+   }
+
+   @Test(expected = IllegalArgumentException.class)
+   public void shouldThrowWhenInvalidTransactionIntegerGiven()
+   {
+      //Act
+      UtilityElf.getTransactionIsolation("9999");
+   }
 }