Use VersionedConfigFile from core

This new class in core replaces the custom AbstractVersionedMetaData
class that has been maintained in the task plugin.

Release-Notes: skip
Change-Id: Id55e658ec3735a59a8241e50a7654f8d1a9e5195

src/main/java/com/google/gerrit/server/git/meta/AbstractVersionedMetaData.java

diff --git a/src/main/java/com/google/gerrit/server/git/meta/AbstractVersionedMetaData.java b/src/main/java/com/google/gerrit/server/git/meta/AbstractVersionedMetaData.java
deleted file mode 100644
index 7997a05..0000000
--- a/src/main/java/com/google/gerrit/server/git/meta/AbstractVersionedMetaData.java
+++ /dev/null
@@ -1,67 +0,0 @@
-// Copyright (C) 2013 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.server.git.meta;
-
-import com.google.gerrit.entities.BranchNameKey;
-import java.io.IOException;
-import org.eclipse.jgit.errors.ConfigInvalidException;
-import org.eclipse.jgit.lib.CommitBuilder;
-import org.eclipse.jgit.lib.Config;
-
-/** Versioned Configuration file living in git */
-public class AbstractVersionedMetaData extends VersionedMetaData {
-  protected final BranchNameKey branch;
-  protected final String fileName;
-  protected Config cfg;
-
-  public AbstractVersionedMetaData(BranchNameKey branch, String fileName) {
-    this.branch = branch;
-    this.fileName = fileName;
-  }
-
-  @Override
-  protected String getRefName() {
-    return branch.branch();
-  }
-
-  protected String getFileName() {
-    return fileName;
-  }
-
-  @Override
-  protected void onLoad() throws IOException, ConfigInvalidException {
-    cfg = readConfig(fileName);
-  }
-
-  public Config get() {
-    if (cfg == null) {
-      cfg = new Config();
-    }
-    return cfg;
-  }
-
-  public BranchNameKey getBranch() {
-    return branch;
-  }
-
-  @Override
-  protected boolean onSave(CommitBuilder commit) throws IOException, ConfigInvalidException {
-    if (commit.getMessage() == null || "".equals(commit.getMessage())) {
-      commit.setMessage("Updated configuration\n");
-    }
-    saveConfig(fileName, cfg);
-    return true;
-  }
-}

src/main/java/com/googlesource/gerrit/plugins/task/TaskConfig.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/task/TaskConfig.java b/src/main/java/com/googlesource/gerrit/plugins/task/TaskConfig.java
index 1859b0d..18d8a5b 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/task/TaskConfig.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/task/TaskConfig.java
@@ -16,7 +16,7 @@
 
 import com.google.gerrit.common.Container;
 import com.google.gerrit.entities.BranchNameKey;
-import com.google.gerrit.server.git.meta.AbstractVersionedMetaData;
+import com.google.gerrit.server.git.meta.VersionedConfigFile;
 import com.googlesource.gerrit.plugins.task.util.Copier;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -30,7 +30,7 @@
 import java.util.stream.Collectors;
 
 /** Task Configuration file living in git */
-public class TaskConfig extends AbstractVersionedMetaData {
+public class TaskConfig extends VersionedConfigFile {
   public enum NamesFactoryType {
     CHANGE,
     STATIC,
@@ -235,7 +235,7 @@
 
   public TaskConfig(
       BranchNameKey masqueraded, FileKey file, boolean isVisible, boolean isMasqueraded) {
-    super(masqueraded, file.file());
+    super(masqueraded.branch(), file.file());
     this.file = file;
     this.isVisible = isVisible;
     this.isMasqueraded = isMasqueraded;