/**
* 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.oozie.cli;
import org.apache.commons.cli.Options;
import org.apache.commons.cli.GnuParser;
import org.apache.commons.cli.ParseException;
import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.HelpFormatter;
import java.util.Map;
import java.util.LinkedHashMap;
import java.text.MessageFormat;
import java.io.PrintWriter;
/**
* Command line parser based on Apache common-cli 1.x that supports subcommands.
*/
public class CLIParser {
private static final String LEFT_PADDING = " ";
private String cliName;
private String[] cliHelp;
private Map<String, Options> commands = new LinkedHashMap<String, Options>();
private Map<String, Boolean> commandWithArgs = new LinkedHashMap<String, Boolean>();
private Map<String, String> commandsHelp = new LinkedHashMap<String, String>();
/**
* Create a parser.
*
* @param cliName name of the parser, for help purposes.
* @param cliHelp help for the CLI.
*/
public CLIParser(String cliName, String[] cliHelp) {
this.cliName = cliName;
this.cliHelp = cliHelp;
}
/**
* Add a command to the parser.
*
* @param command comand name.
* @param argsHelp command arguments help.
* @param commandHelp command description.
* @param commandOptions command options.
* @param hasArguments
*/
public void addCommand(String command, String argsHelp, String commandHelp, Options commandOptions,
boolean hasArguments) {
String helpMsg = argsHelp + ((hasArguments) ? "<ARGS> " : "") + ": " + commandHelp;
commandsHelp.put(command, helpMsg);
commands.put(command, commandOptions);
commandWithArgs.put(command, hasArguments);
}
/**
* Bean that represents a parsed command.
*/
public class Command {
private String name;
private CommandLine commandLine;
private Command(String name, CommandLine commandLine) {
this.name = name;
this.commandLine = commandLine;
}
/**
* Return the command name.
*
* @return the command name.
*/
public String getName() {
return name;
}
/**
* Return the command line.
*
* @return the command line.
*/
public CommandLine getCommandLine() {
return commandLine;
}
}
/**
* Parse a array of arguments into a command.
*
* @param args array of arguments.
* @return the parsed Command.
* @throws ParseException thrown if the arguments could not be parsed.
*/
public Command parse(String[] args) throws ParseException {
if (args.length == 0) {
throw new ParseException("missing sub-command");
}
else {
if (commands.containsKey(args[0])) {
GnuParser parser = new GnuParser();
String[] minusCommand = new String[args.length - 1];
System.arraycopy(args, 1, minusCommand, 0, minusCommand.length);
return new Command(args[0], parser.parse(commands.get(args[0]), minusCommand,
commandWithArgs.get(args[0])));
}
else {
throw new ParseException(MessageFormat.format("invalid sub-command [{0}]", args[0]));
}
}
}
public String shortHelp() {
return "use 'help' sub-command for help details";
}
/**
* Print the help for the parser to standard output.
*/
public void showHelp() {
PrintWriter pw = new PrintWriter(System.out);
pw.println("usage: ");
for (String s : cliHelp) {
pw.println(LEFT_PADDING + s);
}
pw.println();
HelpFormatter formatter = new HelpFormatter();
for (Map.Entry<String, Options> entry : commands.entrySet()) {
String s = LEFT_PADDING + cliName + " " + entry.getKey() + " ";
if (entry.getValue().getOptions().size() > 0) {
pw.println(s + "<OPTIONS> " + commandsHelp.get(entry.getKey()));
formatter.printOptions(pw, 100, entry.getValue(), s.length(), 3);
}
else {
pw.println(s + commandsHelp.get(entry.getKey()));
}
pw.println();
}
pw.flush();
}
}