1 files changed, 117 insertions, 0 deletions
diff --git a/java/com/google/gerrit/server/change/NotifyUtil.java b/java/com/google/gerrit/server/change/NotifyUtil.java
new file mode 100644
index 0000000000..c29faee1d8
--- /dev/null
+++ b/java/com/google/gerrit/server/change/NotifyUtil.java
@@ -0,0 +1,117 @@
+// 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.server.change;
+
+import static java.util.stream.Collectors.joining;
+
+import com.google.common.collect.ImmutableListMultimap;
+import com.google.common.collect.ListMultimap;
+import com.google.common.collect.MultimapBuilder;
+import com.google.gerrit.common.Nullable;
+import com.google.gerrit.extensions.api.changes.NotifyHandling;
+import com.google.gerrit.extensions.api.changes.NotifyInfo;
+import com.google.gerrit.extensions.api.changes.RecipientType;
+import com.google.gerrit.extensions.restapi.BadRequestException;
+import com.google.gerrit.reviewdb.client.Account;
+import com.google.gerrit.server.account.AccountResolver;
+import com.google.gwtorm.server.OrmException;
+import com.google.inject.Inject;
+import com.google.inject.Singleton;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+import org.eclipse.jgit.errors.ConfigInvalidException;
+
+@Singleton
+public class NotifyUtil {
+  private final AccountResolver accountResolver;
+
+  @Inject
+  NotifyUtil(AccountResolver accountResolver) {
+    this.accountResolver = accountResolver;
+  }
+
+  public static boolean shouldNotify(
+      NotifyHandling notify, @Nullable Map<RecipientType, NotifyInfo> notifyDetails) {
+    if (!isNullOrEmpty(notifyDetails)) {
+      return true;
+    }
+
+    return notify.compareTo(NotifyHandling.NONE) > 0;
+  }
+
+  private static boolean isNullOrEmpty(@Nullable Map<RecipientType, NotifyInfo> notifyDetails) {
+    if (notifyDetails == null || notifyDetails.isEmpty()) {
+      return true;
+    }
+
+    for (NotifyInfo notifyInfo : notifyDetails.values()) {
+      if (!isEmpty(notifyInfo)) {
+        return false;
+      }
+    }
+
+    return true;
+  }
+
+  private static boolean isEmpty(NotifyInfo notifyInfo) {
+    return notifyInfo.accounts == null || notifyInfo.accounts.isEmpty();
+  }
+
+  public ListMultimap<RecipientType, Account.Id> resolveAccounts(
+      @Nullable Map<RecipientType, NotifyInfo> notifyDetails)
+      throws OrmException, BadRequestException, IOException, ConfigInvalidException {
+    if (isNullOrEmpty(notifyDetails)) {
+      return ImmutableListMultimap.of();
+    }
+
+    ListMultimap<RecipientType, Account.Id> m = null;
+    for (Entry<RecipientType, NotifyInfo> e : notifyDetails.entrySet()) {
+      List<String> accounts = e.getValue().accounts;
+      if (accounts != null) {
+        if (m == null) {
+          m = MultimapBuilder.hashKeys().arrayListValues().build();
+        }
+        m.putAll(e.getKey(), find(accounts));
+      }
+    }
+
+    return m != null ? m : ImmutableListMultimap.of();
+  }
+
+  private List<Account.Id> find(List<String> nameOrEmails)
+      throws OrmException, BadRequestException, IOException, ConfigInvalidException {
+    List<String> missing = new ArrayList<>(nameOrEmails.size());
+    List<Account.Id> r = new ArrayList<>(nameOrEmails.size());
+    for (String nameOrEmail : nameOrEmails) {
+      Account a = accountResolver.find(nameOrEmail);
+      if (a != null) {
+        r.add(a.getId());
+      } else {
+        missing.add(nameOrEmail);
+      }
+    }
+
+    if (!missing.isEmpty()) {
+      throw new BadRequestException(
+          "The following accounts that should be notified could not be resolved: "
+              + missing.stream().distinct().sorted().collect(joining(", ")));
+    }
+
+    return r;
+  }
+}