com.sun.enterprise.admin.cli.CLIManFileFinder Maven / Gradle / Ivy
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package com.sun.enterprise.admin.cli;
import java.io.File;
import java.io.InputStream;
import java.io.Reader;
import java.io.InputStreamReader;
import java.util.Locale;
import java.util.Iterator;
import java.util.NoSuchElementException;
import java.util.List;
import java.util.Collections;
import java.util.ArrayList;
/**
* A utility class that gets the plain text man page for the
* given command. It searches (using Class.getResource()) for
* the pages, and returns the first one found.
*
* For any given man page multiple instances of that page can exist.
* Man pages are come in sections (1 through 9, 1m through 9m),
* locales (language, country, variant), and by command version.
* These instances are ordered by section number (1 - 9, 1m * - 9m),
* local specificity (most specific to least specific) and then by
* version (later versions before earlier versions).
*
* This is probably not what is wanted (I think what is
* wanted is versions before sections before language specificity),
* but is this way because of the way the Java Class.getResource()
* mechanism works.
*
* All methods will throw a NullPointerException if given null object
* arguments.
*
* All methods will throw an IllegalArgumentException if their
* arguments are non-null but are otherwise meaningless.
*/
public class CLIManFileFinder {
private static final String[] sections = {
"1", "1m", "2", "2m", "3", "3m", "4", "4m", "5", "5m",
"6", "6m", "7", "7m", "8", "8m", "9", "9m", "5asc" };
/**
* Get the man page for the given command, using the default locale
*
* @param cmd the command
*/
public static Reader getCommandManFile(CLICommand cmd) {
return getCommandManFile(cmd, Locale.getDefault());
}
/**
* Get the man page for the given command for the given locale
* @param cmd the command
* @param currentLocale the locale to be used to find the man page
*/
public static Reader getCommandManFile(CLICommand cmd,
Locale currentLocale) {
return getCommandManFile(cmd, currentLocale,
cmd.getClass().getClassLoader());
}
/**
* Get the man page for the given command for the given locale
* using the given classloader.
*
* @param cmd the command
* @param locale the locale to be used to find the man page
* @param classLoader the class loader to be used to find the man page
*/
public static Reader getCommandManFile(CLICommand cmd, Locale locale,
ClassLoader classLoader) {
return getCommandManFile(getCommandName(cmd), cmd.getClass().getName(),
locale, classLoader);
}
/**
* Get the man page for the given command for the given locale
* using the given classloader.
*
* @param cmdName the command name
* @param cmdClass the command class
* @param locale the locale to be used to find the man page
* @param classLoader the class loader to be used to find the man page
*/
public static Reader getCommandManFile(String cmdName, String cmdClass,
Locale locale, ClassLoader classLoader) {
InputStream s = null;
Iterator it = getPossibleLocations(cmdName, cmdClass, locale);
while (s == null && it.hasNext()) {
s = classLoader.getResourceAsStream((String)it.next());
}
return (s == null ? (InputStreamReader)null : new InputStreamReader(s));
}
private static Iterator getPossibleLocations(final String cmdName,
final String cmdClass, final Locale locale) {
return new Iterator() {
final String[] locales = getLocaleLocations(locale);
private int i = 0;
private int j = 0;
private String helpdir = getHelpDir(cmdClass);
private String commandName = cmdName;
public boolean hasNext() {
return i < locales.length && j < sections.length;
}
public Object next() throws NoSuchElementException{
if (!hasNext()) {
throw new NoSuchElementException();
}
final String result = helpdir + locales[i] + "/" +
commandName + "." + sections[j++];
if (j == sections.length) {
i++;
if (i < locales.length)
j = 0;
}
CLILogger.getInstance().printDebugMessage(
"Trying to get this manpage: " + result);
return result;
}
public void remove() {
throw new UnsupportedOperationException();
}
};
}
private static String getCommandName(CLICommand cmd) {
String commandName = cmd.getName();
if (commandName.length() == 0)
throw new IllegalArgumentException(
"Command name cannot be empty");
// special case "help" --> "asadmin"
if (commandName.equals("help"))
commandName = "asadmin";
return commandName;
}
private static String getHelpDir(String cmdClass) {
// The man page is assumed to be packaged with the
// command class.
String pkgname =
cmdClass.substring(0, cmdClass.lastIndexOf('.'));
return pkgname.replace('.', '/');
}
private static String[] getLocaleLocations(Locale locale) {
String language = locale.getLanguage();
String country = locale.getCountry();
String variant = locale.getVariant();
List l = new ArrayList();
l.add("");
if (language != null && language.length() > 0) {
l.add("/" + language);
if (country != null && country.length() > 0) {
l.add("/" + language + "/" + country);
if (variant != null && variant.length() > 0)
l.add("/" + language + "/" + country + "/" + variant);
}
}
Collections.reverse(l);
return l.toArray(new String[l.size()]);
}
}
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