/**
* 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.mahout.common;
import java.io.PrintWriter;
import org.apache.commons.cli.Options;
import org.apache.commons.cli2.Group;
import org.apache.commons.cli2.OptionException;
import org.apache.commons.cli2.util.HelpFormatter;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.util.GenericOptionsParser;
public final class CommandLineUtil {
private CommandLineUtil() { }
public static void printHelp(Group group) {
HelpFormatter formatter = new HelpFormatter();
formatter.setGroup(group);
formatter.print();
}
/**
* Print the options supported by {@code GenericOptionsParser}.
* In addition to the options supported by the job, passed in as the
* group parameter.
*
* @param group job-specific command-line options.
*/
public static void printHelpWithGenericOptions(Group group) {
Options ops = new Options();
new GenericOptionsParser(new Configuration(), ops, new String[0]);
org.apache.commons.cli.HelpFormatter fmt = new org.apache.commons.cli.HelpFormatter();
fmt.printHelp("<command> [Generic Options] [Job-Specific Options]",
"Generic Options:", ops, "");
PrintWriter pw = new PrintWriter(System.out);
HelpFormatter formatter = new HelpFormatter();
formatter.setGroup(group);
formatter.setPrintWriter(pw);
formatter.printHelp();
formatter.setFooter("Specify HDFS directories while running on hadoop; else specify local file system directories");
formatter.printFooter();
pw.flush();
}
public static void printHelpWithGenericOptions(Group group, OptionException oe) {
Options ops = new Options();
new GenericOptionsParser(new Configuration(), ops, new String[0]);
org.apache.commons.cli.HelpFormatter fmt = new org.apache.commons.cli.HelpFormatter();
fmt.printHelp("<command> [Generic Options] [Job-Specific Options]",
"Generic Options:", ops, "");
PrintWriter pw = new PrintWriter(System.out);
HelpFormatter formatter = new HelpFormatter();
formatter.setGroup(group);
formatter.setPrintWriter(pw);
formatter.setException(oe);
formatter.print();
pw.flush();
}
}