| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.sqoop.tool; |
| |
| import java.util.Set; |
| |
| import org.apache.sqoop.SqoopOptions; |
| import org.apache.sqoop.cli.ToolOptions; |
| |
| /** |
| * Tool that explains the usage of Sqoop. |
| */ |
| public class HelpTool extends BaseSqoopTool { |
| |
| public HelpTool() { |
| super("help"); |
| } |
| |
| /** |
| * @param str the string to right-side pad |
| * @param num the minimum number of characters to return |
| * @return 'str' with enough right padding to make it num characters long. |
| */ |
| private static String padRight(String str, int num) { |
| StringBuilder sb = new StringBuilder(); |
| sb.append(str); |
| for (int count = str.length(); count < num; count++) { |
| sb.append(" "); |
| } |
| |
| return sb.toString(); |
| } |
| |
| /** |
| * Print out a list of all SqoopTool implementations and their |
| * descriptions. |
| */ |
| private void printAvailableTools() { |
| System.out.println("usage: sqoop COMMAND [ARGS]"); |
| System.out.println(""); |
| System.out.println("Available commands:"); |
| |
| Set<String> toolNames = getToolNames(); |
| |
| int maxWidth = 0; |
| for (String tool : toolNames) { |
| maxWidth = Math.max(maxWidth, tool.length()); |
| } |
| |
| for (String tool : toolNames) { |
| System.out.println(" " + padRight(tool, maxWidth+2) |
| + getToolDescription(tool)); |
| } |
| |
| System.out.println(""); |
| System.out.println( |
| "See 'sqoop help COMMAND' for information on a specific command."); |
| } |
| |
| |
| @Override |
| /** {@inheritDoc} */ |
| public int run(SqoopOptions options) { |
| |
| if (this.extraArguments != null && this.extraArguments.length > 0) { |
| if (hasUnrecognizedArgs(extraArguments, 1, extraArguments.length)) { |
| return 1; |
| } |
| |
| SqoopTool subTool = SqoopTool.getTool(extraArguments[0]); |
| if (null == subTool) { |
| System.out.println("No such tool: " + extraArguments[0]); |
| System.out.println( |
| "Try 'sqoop help' for a list of available commands."); |
| return 1; |
| } else { |
| ToolOptions toolOpts = new ToolOptions(); |
| subTool.configureOptions(toolOpts); |
| subTool.printHelp(toolOpts); |
| return 0; |
| } |
| } else { |
| printAvailableTools(); |
| } |
| |
| return 0; |
| } |
| |
| @Override |
| public void printHelp(ToolOptions opts) { |
| System.out.println("usage: sqoop " + getToolName() + " [COMMAND]"); |
| } |
| } |
| |