Extract audit configuration into a separate class

Make the configuration a 1st class citizen by having a dedicated
AuditConfig where more logic can be put in the right place.
Change-Id: I06a8ff691bb64253689d77077224f0a5bc05064c

Change-Id: Id229740f0e2f5d1f303d6608253b09270fad6a37
diff --git a/src/main/java/com/googlesource/gerrit/plugins/auditsl4j/AuditConfig.java b/src/main/java/com/googlesource/gerrit/plugins/auditsl4j/AuditConfig.java
new file mode 100644
index 0000000..ce7a09a
--- /dev/null
+++ b/src/main/java/com/googlesource/gerrit/plugins/auditsl4j/AuditConfig.java
@@ -0,0 +1,33 @@
+// Copyright (C) 2018 The Android Open Source Project
+//
+// 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.googlesource.gerrit.plugins.auditsl4j;
+
+import com.google.gerrit.extensions.annotations.PluginName;
+import com.google.gerrit.server.config.PluginConfig;
+import com.google.gerrit.server.config.PluginConfigFactory;
+import com.google.inject.Inject;
+
+public class AuditConfig {
+  private final PluginConfig config;
+
+  @Inject
+  public AuditConfig(@PluginName String pluginName, PluginConfigFactory configFactory) {
+    config = configFactory.getFromGerritConfig(pluginName);
+  }
+
+  public AuditFormatTypes getFormat() {
+    return config.getEnum("format", AuditFormatTypes.CSV);
+  }
+}
diff --git a/src/main/java/com/googlesource/gerrit/plugins/auditsl4j/Module.java b/src/main/java/com/googlesource/gerrit/plugins/auditsl4j/Module.java
index 436ee37..664ce4d 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/auditsl4j/Module.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/auditsl4j/Module.java
@@ -15,26 +15,23 @@
 package com.googlesource.gerrit.plugins.auditsl4j;
 
 import com.google.gerrit.audit.AuditListener;
-import com.google.gerrit.extensions.annotations.PluginName;
 import com.google.gerrit.extensions.registration.DynamicSet;
-import com.google.gerrit.server.config.PluginConfig;
-import com.google.gerrit.server.config.PluginConfigFactory;
 import com.google.inject.AbstractModule;
 import com.google.inject.Inject;
 
 public class Module extends AbstractModule {
-  private final PluginConfig config;
+  private final AuditConfig config;
 
   @Inject
-  public Module(@PluginName String pluginName, PluginConfigFactory configFactory) {
-    config = configFactory.getFromGerritConfig(pluginName);
+  public Module(AuditConfig config) {
+    this.config = config;
   }
 
   @Override
   protected void configure() {
     DynamicSet.bind(binder(), AuditListener.class).to(LoggerAudit.class);
 
-    AuditFormatTypes rendererType = config.getEnum("format", AuditFormatTypes.CSV);
+    AuditFormatTypes rendererType = config.getFormat();
     switch (rendererType) {
       case CSV:
         bind(AuditFormatRenderer.class).to(AuditRendererToCsv.class);