Import code from internal repository to git

java/com/google/domain/registry/tools/DeletePremiumListCommand.java

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+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// 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.domain.registry.tools;
+
+import static com.google.common.base.Preconditions.checkArgument;
+
+import com.google.common.base.Joiner;
+import com.google.common.collect.ImmutableSet;
+import com.google.domain.registry.model.registry.label.PremiumList;
+import com.google.domain.registry.tools.Command.RemoteApiCommand;
+
+import com.beust.jcommander.Parameter;
+import com.beust.jcommander.Parameters;
+
+import javax.annotation.Nullable;
+
+
+/**
+ * Command to delete a {@link PremiumList} in Datastore. This command will fail if the premium
+ * list is currently in use on a tld.
+ */
+@Parameters(separators = " =", commandDescription = "Delete a PremiumList from Datastore.")
+final class DeletePremiumListCommand extends ConfirmingCommand implements RemoteApiCommand {
+
+  @Nullable
+  PremiumList premiumList;
+
+  @Parameter(
+      names = {"-n", "--name"},
+      description = "The name of the premium list to delete.",
+      required = true)
+  private String name;
+
+  @Override
+  protected void init() throws Exception {
+    checkArgument(
+        PremiumList.exists(name),
+        "Cannot delete the premium list %s because it doesn't exist.",
+        name);
+    premiumList = PremiumList.get(name).get();
+    ImmutableSet<String> tldsUsedOn = premiumList.getReferencingTlds();
+    checkArgument(
+        tldsUsedOn.isEmpty(),
+        "Cannot delete premium list because it is used on these tld(s): %s",
+        Joiner.on(", ").join(tldsUsedOn));
+  }
+
+  @Override
+  protected String prompt() {
+    return "You are about to delete the premium list: \n" + premiumList;
+  }
+
+  @Override
+  protected String execute() throws Exception {
+    premiumList.delete();
+    return String.format(
+        "Deleted premium list %s with %d entries.\n",
+        premiumList.getName(),
+        premiumList.getPremiumListEntries().size());
+  }
+}