Import code from internal repository to git

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

@@ -0,0 +1,64 @@
+// 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.domain.registry.tools.CommandUtilities.printLineIfNotEmpty;
+import static com.google.domain.registry.tools.CommandUtilities.promptForYes;
+
+import com.beust.jcommander.Parameter;
+
+/** A {@link Command} that implements a confirmation step before executing. */
+public abstract class ConfirmingCommand implements Command {
+
+  @Parameter(
+      names = {"-f", "--force"},
+      description = "Do not prompt before executing")
+  boolean force;
+
+  @Override
+  public final void run() throws Exception {
+    if (checkExecutionState()) {
+      init();
+      printLineIfNotEmpty(prompt());
+      if (force || promptForYes("Perform this command?")) {
+        System.out.println(execute());
+        printLineIfNotEmpty(verify());
+      } else {
+        System.out.println("Command aborted.");
+      }
+    }
+  }
+
+  /** Run any pre-execute command checks and return true if they all pass. */
+  protected boolean checkExecutionState() throws Exception {
+    return true;
+  }
+
+  /** Initializes the command. */
+  protected void init() throws Exception {}
+
+  /** Returns the optional extra confirmation prompt for the command. */
+  protected String prompt() throws Exception {
+    return "";
+  }
+
+  /** Perform the command and return a result description. */
+  protected abstract String execute() throws Exception;
+
+  /** Verify result and/or perform any post-execution steps, and return optional description. */
+  protected String verify() throws Exception {
+    return "";
+  }
+}