add server config : default enum type (#1655)

ENH: add server config : default enum type

src/main/java/io/ebean/config/ServerConfig.java

@@ -32,6 +32,7 @@ import io.ebean.meta.MetaInfoManager;
 import io.ebean.migration.MigrationRunner;
 import io.ebean.util.StringHelper;
 
+import javax.persistence.EnumType;
 import javax.sql.DataSource;
 import java.time.Clock;
 import java.util.ArrayList;
@@ -229,6 +230,8 @@ public class ServerConfig {
 
   private int persistBatchSize = 20;
 
+  private EnumType defaultEnumType = EnumType.ORDINAL;
+
   private boolean disableLazyLoading;
 
   /**
@@ -978,6 +981,14 @@ public class ServerConfig {
     this.queryBatchSize = queryBatchSize;
   }
 
+  public EnumType getDefaultEnumType() {
+    return defaultEnumType;
+  }
+
+  public void setDefaultEnumType(EnumType defaultEnumType) {
+    this.defaultEnumType = defaultEnumType;
+  }
+
   /**
    * Return true if lazy loading is disabled on queries by default.
    */
@@ -2963,6 +2974,7 @@ public class ServerConfig {
     localTimeWithNanos = p.getBoolean("localTimeWithNanos", localTimeWithNanos);
     jodaLocalTimeMode = p.get("jodaLocalTimeMode", jodaLocalTimeMode);
 
+    defaultEnumType = p.getEnum(EnumType.class, "defaultEnumType", defaultEnumType);
     disableLazyLoading = p.getBoolean("disableLazyLoading", disableLazyLoading);
     lazyLoadBatchSize = p.getInt("lazyLoadBatchSize", lazyLoadBatchSize);
     queryBatchSize = p.getInt("queryBatchSize", queryBatchSize);

src/main/java/io/ebeaninternal/server/type/DefaultTypeManager.java

@@ -154,6 +154,8 @@ public final class DefaultTypeManager implements TypeManager {
 
   private final boolean offlineMigrationGeneration;
 
+  private final EnumType defaultEnumType;
+
   // OPTIONAL ScalarTypes registered if Jackson/JsonNode is in the classpath
 
   /**
@@ -201,6 +203,8 @@ public final class DefaultTypeManager implements TypeManager {
 
     this.offlineMigrationGeneration = DbOffline.isGenerateMigration();
 
+    this.defaultEnumType = config.getDefaultEnumType();
+
     initialiseStandard(jsonDateTime, config);
     initialiseJavaTimeTypes(jsonDateTime, config);
     initialiseJodaTypes(jsonDateTime, config);
@@ -645,8 +649,13 @@ public final class DefaultTypeManager implements TypeManager {
 
   private ScalarTypeEnum<?> createEnumScalarTypePerSpec(Class<?> enumType, EnumType type) {
     if (type == null) {
-      // default as per spec is ORDINAL
-      return new ScalarTypeEnumStandard.OrdinalEnum(enumType);
+
+      if(defaultEnumType == EnumType.ORDINAL) {
+        return new ScalarTypeEnumStandard.OrdinalEnum(enumType);
+
+      } else {
+        return new ScalarTypeEnumStandard.StringEnum(enumType);
+      }
 
     } else if (type == EnumType.ORDINAL) {
       return new ScalarTypeEnumStandard.OrdinalEnum(enumType);