Move GroupInfoCache to com.google.gerrit.server.group

Change-Id: Iec919640de7a7fc8e63ce5acb55a224501121ecd

gerrit-common/src/main/java/com/google/gerrit/common/data/GroupInfoCache.java

@@ -1,79 +0,0 @@
-// Copyright (C) 2011 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.common.data;
-
-import com.google.gerrit.reviewdb.client.AccountGroup;
-
-import java.util.Collections;
-import java.util.HashMap;
-import java.util.Map;
-
-/** In-memory table of {@link GroupInfo}, indexed by {@code AccountGroup.Id}. */
-public class GroupInfoCache {
-  private static final GroupInfoCache EMPTY;
-  static {
-    EMPTY = new GroupInfoCache();
-    EMPTY.groups = Collections.emptyMap();
-  }
-
-  /** Obtain an empty cache singleton. */
-  public static GroupInfoCache empty() {
-    return EMPTY;
-  }
-
-  protected Map<AccountGroup.UUID, GroupInfo> groups;
-
-  protected GroupInfoCache() {
-  }
-
-  public GroupInfoCache(final Iterable<GroupInfo> list) {
-    groups = new HashMap<>();
-    for (final GroupInfo gi : list) {
-      groups.put(gi.getId(), gi);
-    }
-  }
-
-  /**
-   * Lookup the group summary
-   * <p>
-   * The return value can take on one of three forms:
-   * <ul>
-   * <li>{@code null}, if {@code id == null}.</li>
-   * <li>a valid info block, if {@code id} was loaded.</li>
-   * <li>an anonymous info block, if {@code id} was not loaded.</li>
-   * </ul>
-   *
-   * @param uuid the id desired.
-   * @return info block for the group.
-   */
-  public GroupInfo get(final AccountGroup.UUID uuid) {
-    if (uuid == null) {
-      return null;
-    }
-
-    GroupInfo r = groups.get(uuid);
-    if (r == null) {
-      r = new GroupInfo(uuid);
-      groups.put(uuid, r);
-    }
-    return r;
-  }
-
-  /** Merge the information from another cache into this one. */
-  public void merge(final GroupInfoCache other) {
-    assert this != EMPTY;
-    groups.putAll(other.groups);
-  }
-}