Example usage for org.apache.hadoop.fs.shell Command getUsage

Introduction

In this page you can find the example usage for org.apache.hadoop.fs.shell Command getUsage.

Prototype

public String getUsage() 

Source Link

Document

The short usage suitable for the synopsis

Usage

From source file:com.ruizhan.hadoop.hdfs.FsShell.java

License:Apache License

private void printInfo(PrintStream out, String cmd, boolean showHelp) {
    if (cmd != null) {
        // display help or usage for one command
        Command instance = commandFactory.getInstance("-" + cmd);
        if (instance == null) {
            throw new UnknownCommandException(cmd);
        }/* w w  w . ja v a 2  s  . c om*/
        if (showHelp) {
            printInstanceHelp(out, instance);
        } else {
            printInstanceUsage(out, instance);
        }
    } else {
        // display help or usage for all commands 
        out.println(usagePrefix);

        // display list of short usages
        ArrayList<Command> instances = new ArrayList<Command>();
        for (String name : commandFactory.getNames()) {
            Command instance = commandFactory.getInstance(name);
            if (!instance.isDeprecated()) {
                System.out.println("\t[" + instance.getUsage() + "]");
                instances.add(instance);
            }
        }
        // display long descriptions for each command
        if (showHelp) {
            for (Command instance : instances) {
                out.println();
                printInstanceHelp(out, instance);
            }
        }
        out.println();
        ToolRunner.printGenericCommandUsage(out);
    }
}

---

From source file:com.ruizhan.hadoop.hdfs.FsShell.java

License:Apache License

private void printInstanceUsage(PrintStream out, Command instance) {
    out.println(usagePrefix + " " + instance.getUsage());
}

---

From source file:com.ruizhan.hadoop.hdfs.FsShell.java

License:Apache License

private void printInstanceHelp(PrintStream out, Command instance) {
    boolean firstLine = true;
    for (String line : instance.getDescription().split("\n")) {
        String prefix;/*from  w  ww.ja v a  2s  . c  o m*/
        if (firstLine) {
            prefix = instance.getUsage() + ":\t";
            firstLine = false;
        } else {
            prefix = "\t\t";
        }
        System.out.println(prefix + line);
    }
}

---