Clean up UiPreference

Rename UiType as it is a neutral type, not necessarily tied to a user
preference. Move to client extension API package in preparation for
exposing via REST API to the GWT UI. Add a convenience method for
parsing, albeit without Optional as we don't have that in GWT.

Change-Id: Ib2a7061ce2c34bf6d452d060cc045cf65481b208

gerrit-extension-api/src/main/java/com/google/gerrit/extensions/client/UiType.java

@@ -0,0 +1,32 @@
+// Copyright (C) 2016 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.google.gerrit.extensions.client;
+
+public enum UiType {
+  NONE,
+  GWT,
+  POLYGERRIT;
+
+  public static UiType parse(String str) {
+    if (str != null) {
+      for (UiType type : UiType.values()) {
+        if (type.name().equalsIgnoreCase(str)) {
+          return type;
+        }
+      }
+    }
+    return null;
+  }
+}

gerrit-httpd/src/main/java/com/google/gerrit/httpd/GerritOptions.java

@@ -17,23 +17,17 @@ package com.google.gerrit.httpd;
 import static com.google.common.base.MoreObjects.firstNonNull;
 import static com.google.common.base.Preconditions.checkArgument;
 
-import com.google.common.base.Enums;
+import com.google.gerrit.extensions.client.UiType;
 
 import org.eclipse.jgit.lib.Config;
 
 public class GerritOptions {
-  public enum UiPreference {
-    NONE,
-    GWT,
-    POLYGERRIT;
-  }
-
   private final boolean headless;
   private final boolean slave;
   private final boolean enablePolyGerrit;
   private final boolean enableGwtUi;
   private final boolean forcePolyGerritDev;
-  private final UiPreference defaultUi;
+  private final UiType defaultUi;
 
   public GerritOptions(Config cfg, boolean headless, boolean slave,
       boolean forcePolyGerritDev) {
@@ -44,24 +38,22 @@ public class GerritOptions {
     this.forcePolyGerritDev = forcePolyGerritDev;
     this.headless = headless || (!enableGwtUi && !enablePolyGerrit);
 
-    UiPreference defaultUi = enablePolyGerrit && !enableGwtUi
-        ? UiPreference.POLYGERRIT
-        : UiPreference.GWT;
+    UiType defaultUi = enablePolyGerrit && !enableGwtUi
+        ? UiType.POLYGERRIT
+        : UiType.GWT;
     String uiStr = firstNonNull(
         cfg.getString("gerrit", null, "ui"),
-        defaultUi.name().toUpperCase());
-    this.defaultUi =
-        Enums.getIfPresent(UiPreference.class, uiStr).or(UiPreference.NONE);
-    uiStr = defaultUi.name().toLowerCase();
+        defaultUi.name());
+    this.defaultUi = firstNonNull(UiType.parse(uiStr), UiType.NONE);
 
     switch (defaultUi) {
       case GWT:
         checkArgument(enableGwtUi,
-            "gerrit.ui = %s but GWT UI is disabled", uiStr);
+            "gerrit.ui = %s but GWT UI is disabled", defaultUi);
         break;
       case POLYGERRIT:
         checkArgument(enablePolyGerrit,
-            "gerrit.ui = %s but PolyGerrit is disabled", uiStr);
+            "gerrit.ui = %s but PolyGerrit is disabled", defaultUi);
         break;
       case NONE:
       default:
@@ -89,7 +81,7 @@ public class GerritOptions {
     return !headless && forcePolyGerritDev;
   }
 
-  public UiPreference defaultUi() {
+  public UiType defaultUi() {
     return defaultUi;
   }
 }

gerrit-httpd/src/main/java/com/google/gerrit/httpd/raw/StaticModule.java

@@ -19,11 +19,10 @@ import static com.google.common.base.Preconditions.checkState;
 import static java.nio.file.Files.exists;
 import static java.nio.file.Files.isReadable;
 
-import com.google.common.base.Enums;
 import com.google.common.cache.Cache;
 import com.google.common.collect.ImmutableList;
+import com.google.gerrit.extensions.client.UiType;
 import com.google.gerrit.httpd.GerritOptions;
-import com.google.gerrit.httpd.GerritOptions.UiPreference;
 import com.google.gerrit.httpd.XsrfCookieFilter;
 import com.google.gerrit.httpd.raw.ResourceServlet.Resource;
 import com.google.gerrit.launcher.GerritLauncher;
@@ -514,34 +513,36 @@ public class StaticModule extends ServletModule {
       }
       String param = req.getParameter("polygerrit");
       if ("1".equals(param)) {
-        return setPolyGerritCookie(req, res, UiPreference.POLYGERRIT);
+        return setPolyGerritCookie(req, res, UiType.POLYGERRIT);
       } else if ("0".equals(param)) {
-        return setPolyGerritCookie(req, res, UiPreference.GWT);
+        return setPolyGerritCookie(req, res, UiType.GWT);
       } else {
         return isPolyGerritCookie(req);
       }
     }
 
     private boolean isPolyGerritCookie(HttpServletRequest req) {
-      UiPreference pref = options.defaultUi();
+      UiType type = options.defaultUi();
       Cookie[] all = req.getCookies();
       if (all != null) {
         for (Cookie c : all) {
           if (GERRIT_UI_COOKIE.equals(c.getName())) {
-            String v = c.getValue().toUpperCase();
-            pref = Enums.getIfPresent(UiPreference.class, v).or(pref);
+            UiType t = UiType.parse(c.getValue());
+            if (t != null) {
+              type = t;
               break;
             }
           }
         }
-      return pref == UiPreference.POLYGERRIT;
+      }
+      return type == UiType.POLYGERRIT;
     }
 
     private boolean setPolyGerritCookie(HttpServletRequest req,
-        HttpServletResponse res, UiPreference pref) {
+        HttpServletResponse res, UiType pref) {
       // Only actually set a cookie if both UIs are enabled in the server;
       // otherwise clear it.
-      Cookie cookie = new Cookie(GERRIT_UI_COOKIE, pref.name().toLowerCase());
+      Cookie cookie = new Cookie(GERRIT_UI_COOKIE, pref.name());
       if (options.enablePolyGerrit() && options.enableGwtUi()) {
         cookie.setPath("/");
         cookie.setSecure(isSecure(req));
@@ -551,7 +552,7 @@ public class StaticModule extends ServletModule {
         cookie.setMaxAge(0);
       }
       res.addCookie(cookie);
-      return pref == UiPreference.POLYGERRIT;
+      return pref == UiType.POLYGERRIT;
     }
 
     private static boolean isSecure(HttpServletRequest req) {