/**
* Copyright (C) 2010 the original author or authors.
* See the notice.md file distributed with this work for additional
* information regarding copyright ownership.
*
* Licensed 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 com.beust.jcommander;
import com.beust.jcommander.converters.IParameterSplitter;
import com.beust.jcommander.converters.NoConverter;
import com.beust.jcommander.converters.StringConverter;
import com.beust.jcommander.internal.Console;
import com.beust.jcommander.internal.DefaultConsole;
import com.beust.jcommander.internal.DefaultConverterFactory;
import com.beust.jcommander.internal.JDK6Console;
import com.beust.jcommander.internal.Lists;
import com.beust.jcommander.internal.Maps;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.lang.annotation.Annotation;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.EnumSet;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.ResourceBundle;
/**
* The main class for JCommander. It's responsible for parsing the object that contains
* all the annotated fields, parse the command line and assign the fields with the correct
* values and a few other helper methods, such as usage().
*
* The object(s) you pass in the constructor are expected to have one or more
* \@Parameter annotations on them. You can pass either a single object, an array of objects
* or an instance of Iterable. In the case of an array or Iterable, JCommander will collect
* the \@Parameter annotations from all the objects passed in parameter.
*
* @author cbeust
*/
public class JCommander {
public static final String DEBUG_PROPERTY = "jcommander.debug";
/**
* A map to look up parameter description per option name.
*/
private Map<String, ParameterDescription> m_descriptions;
/**
* The objects that contain fields annotated with @Parameter.
*/
private List<Object> m_objects = Lists.newArrayList();
/**
* This field will contain whatever command line parameter is not an option.
* It is expected to be a List<String>.
*/
private Field m_mainParameterField = null;
/**
* The object on which we found the main parameter field.
*/
private Object m_mainParameterObject;
/**
* The annotation found on the main parameter field.
*/
private Parameter m_mainParameterAnnotation;
private ParameterDescription m_mainParameterDescription;
/**
* A set of all the fields that are required. During the reflection phase,
* this field receives all the fields that are annotated with required=true
* and during the parsing phase, all the fields that are assigned a value
* are removed from it. At the end of the parsing phase, if it's not empty,
* then some required fields did not receive a value and an exception is
* thrown.
*/
private Map<Field, ParameterDescription> m_requiredFields = Maps.newHashMap();
/**
* A map of all the annotated fields.
*/
private Map<Field, ParameterDescription> m_fields = Maps.newHashMap();
private ResourceBundle m_bundle;
/**
* A default provider returns default values for the parameters.
*/
private IDefaultProvider m_defaultProvider;
/**
* List of commands and their instance.
*/
private Map<ProgramName, JCommander> m_commands = Maps.newLinkedHashMap();
/**
* Alias database for reverse lookup
*/
private Map<String, ProgramName> aliasMap = Maps.newLinkedHashMap();
/**
* The name of the command after the parsing has run.
*/
private String m_parsedCommand;
/**
* The name of command or alias as it was passed to the
* command line
*/
private String m_parsedAlias;
private ProgramName m_programName;
private Comparator<? super ParameterDescription> m_parameterDescriptionComparator
= new Comparator<ParameterDescription>() {
public int compare(ParameterDescription p0, ParameterDescription p1) {
return p0.getLongestName().compareTo(p1.getLongestName());
}
};
private int m_columnSize = 79;
private static Console m_console;
/**
* The factories used to look up string converters.
*/
private static LinkedList<IStringConverterFactory> CONVERTER_FACTORIES = Lists.newLinkedList();
static {
CONVERTER_FACTORIES.addFirst(new DefaultConverterFactory());
};
/**
* Creates a new un-configured JCommander object.
*/
public JCommander() {
}
/**
* @param object The arg object expected to contain {@link Parameter} annotations.
*/
public JCommander(Object object) {
addObject(object);
createDescriptions();
}
/**
* @param object The arg object expected to contain {@link Parameter} annotations.
* @param bundle The bundle to use for the descriptions. Can be null.
*/
public JCommander(Object object, ResourceBundle bundle) {
addObject(object);
setDescriptionsBundle(bundle);
}
/**
* @param object The arg object expected to contain {@link Parameter} annotations.
* @param bundle The bundle to use for the descriptions. Can be null.
* @param args The arguments to parse (optional).
*/
public JCommander(Object object, ResourceBundle bundle, String... args) {
addObject(object);
setDescriptionsBundle(bundle);
parse(args);
}
/**
* @param object The arg object expected to contain {@link Parameter} annotations.
* @param args The arguments to parse (optional).
*/
public JCommander(Object object, String... args) {
addObject(object);
parse(args);
}
public static Console getConsole() {
if (m_console == null) {
try {
Method consoleMethod = System.class.getDeclaredMethod("console", new Class<?>[0]);
Object console = consoleMethod.invoke(null, new Object[0]);
m_console = new JDK6Console(console);
} catch (Throwable t) {
m_console = new DefaultConsole();
}
}
return m_console;
}
/**
* Adds the provided arg object to the set of objects that this commander
* will parse arguments into.
*
* @param object The arg object expected to contain {@link Parameter}
* annotations. If <code>object</code> is an array or is {@link Iterable},
* the child objects will be added instead.
*/
// declared final since this is invoked from constructors
public final void addObject(Object object) {
if (object instanceof Iterable) {
// Iterable
for (Object o : (Iterable<?>) object) {
m_objects.add(o);
}
} else if (object.getClass().isArray()) {
// Array
for (Object o : (Object[]) object) {
m_objects.add(o);
}
} else {
// Single object
m_objects.add(object);
}
}
/**
* Sets the {@link ResourceBundle} to use for looking up descriptions.
* Set this to <code>null</code> to use description text directly.
*/
// declared final since this is invoked from constructors
public final void setDescriptionsBundle(ResourceBundle bundle) {
m_bundle = bundle;
}
/**
* Parse and validate the command line parameters.
*/
public void parse(String... args) {
parse(true /* validate */, args);
}
/**
* Parse the command line parameters without validating them.
*/
public void parseWithoutValidation(String... args) {
parse(false /* no validation */, args);
}
private void parse(boolean validate, String... args) {
StringBuilder sb = new StringBuilder("Parsing \"");
sb.append(join(args).append("\"\n with:").append(join(m_objects.toArray())));
p(sb.toString());
if (m_descriptions == null) createDescriptions();
initializeDefaultValues();
parseValues(expandArgs(args));
if (validate) validateOptions();
}
private StringBuilder join(Object[] args) {
StringBuilder result = new StringBuilder();
for (int i = 0; i < args.length; i++) {
if (i > 0) result.append(" ");
result.append(args[i]);
}
return result;
}
private void initializeDefaultValues() {
if (m_defaultProvider != null) {
for (ParameterDescription pd : m_descriptions.values()) {
initializeDefaultValue(pd);
}
for (Map.Entry<ProgramName, JCommander> entry : m_commands.entrySet()) {
entry.getValue().initializeDefaultValues();
}
}
}
/**
* Make sure that all the required parameters have received a value.
*/
private void validateOptions() {
if (! m_requiredFields.isEmpty()) {
StringBuilder missingFields = new StringBuilder();
for (ParameterDescription pd : m_requiredFields.values()) {
missingFields.append(pd.getNames()).append(" ");
}
throw new ParameterException("The following options are required: " + missingFields);
}
if (m_mainParameterDescription != null) {
if (m_mainParameterDescription.getParameter().required() &&
!m_mainParameterDescription.isAssigned()) {
throw new ParameterException("Main parameters are required (\""
+ m_mainParameterDescription.getDescription() + "\")");
}
}
}
/**
* Expand the command line parameters to take @ parameters into account.
* When @ is encountered, the content of the file that follows is inserted
* in the command line.
*
* @param originalArgv the original command line parameters
* @return the new and enriched command line parameters
*/
private String[] expandArgs(String[] originalArgv) {
List<String> vResult1 = Lists.newArrayList();
//
// Expand @
//
for (String arg : originalArgv) {
if (arg.startsWith("@")) {
String fileName = arg.substring(1);
vResult1.addAll(readFile(fileName));
}
else {
List<String> expanded = expandDynamicArg(arg);
vResult1.addAll(expanded);
}
}
// Expand separators
//
List<String> vResult2 = Lists.newArrayList();
for (int i = 0; i < vResult1.size(); i++) {
String arg = vResult1.get(i);
String[] v1 = vResult1.toArray(new String[0]);
if (isOption(v1, arg)) {
String sep = getSeparatorFor(v1, arg);
if (! " ".equals(sep)) {
String[] sp = arg.split("[" + sep + "]", 2);
for (String ssp : sp) {
vResult2.add(ssp);
}
} else {
vResult2.add(arg);
}
} else {
vResult2.add(arg);
}
}
return vResult2.toArray(new String[vResult2.size()]);
}
private List<String> expandDynamicArg(String arg) {
for (ParameterDescription pd : m_descriptions.values()) {
if (pd.isDynamicParameter()) {
for (String name : pd.getParameter().names()) {
if (arg.startsWith(name) && !arg.equals(name)) {
return Arrays.asList(name, arg.substring(name.length()));
}
}
}
}
return Arrays.asList(arg);
}
private boolean isOption(String[] args, String arg) {
String prefixes = getOptionPrefixes(args, arg);
return prefixes.indexOf(arg.charAt(0)) >= 0;
}
private ParameterDescription getPrefixDescriptionFor(String arg) {
for (Map.Entry<String, ParameterDescription> es : m_descriptions.entrySet()) {
if (arg.startsWith(es.getKey())) return es.getValue();
}
return null;
}
/**
* If arg is an option, we can look it up directly, but if it's a value,
* we need to find the description for the option that precedes it.
*/
private ParameterDescription getDescriptionFor(String[] args, String arg) {
ParameterDescription result = getPrefixDescriptionFor(arg);
if (result != null) return result;
for (String a : args) {
ParameterDescription pd = getPrefixDescriptionFor(arg);
if (pd != null) result = pd;
if (a.equals(arg)) return result;
}
throw new ParameterException("Unknown parameter: " + arg);
}
private String getSeparatorFor(String[] args, String arg) {
ParameterDescription pd = getDescriptionFor(args, arg);
// Could be null if only main parameters were passed
if (pd != null) {
Parameters p = pd.getObject().getClass().getAnnotation(Parameters.class);
if (p != null) return p.separators();
}
return " ";
}
private String getOptionPrefixes(String[] args, String arg) {
ParameterDescription pd = getDescriptionFor(args, arg);
// Could be null if only main parameters were passed
if (pd != null) {
Parameters p = pd.getObject().getClass()
.getAnnotation(Parameters.class);
if (p != null) return p.optionPrefixes();
}
return Parameters.DEFAULT_OPTION_PREFIXES;
}
/**
* Reads the file specified by filename and returns the file content as a string.
* End of lines are replaced by a space.
*
* @param fileName the command line filename
* @return the file content as a string.
*/
private static List<String> readFile(String fileName) {
List<String> result = Lists.newArrayList();
try {
BufferedReader bufRead = new BufferedReader(new FileReader(fileName));
String line;
// Read through file one line at time. Print line # and line
while ((line = bufRead.readLine()) != null) {
// Allow empty lines in these at files
if (line.length() > 0) result.add(line);
}
bufRead.close();
}
catch (IOException e) {
throw new ParameterException("Could not read file " + fileName + ": " + e);
}
return result;
}
/**
* Remove spaces at both ends and handle double quotes.
*/
private static String trim(String string) {
String result = string.trim();
if (result.startsWith("\"")) {
if (result.endsWith("\"")) {
return result.substring(1, result.length() - 1);
}
return result.substring(1);
}
return result;
}
/**
* Create the ParameterDescriptions for all the \@Parameter found.
*/
private void createDescriptions() {
m_descriptions = Maps.newHashMap();
for (Object object : m_objects) {
addDescription(object);
}
}
private void addDescription(Object object) {
Class<?> cls = object.getClass();
while (!Object.class.equals(cls)) {
for (Field f : cls.getDeclaredFields()) {
p("Field:" + cls.getSimpleName() + "." + f.getName());
f.setAccessible(true);
Annotation annotation = f.getAnnotation(Parameter.class);
Annotation delegateAnnotation = f.getAnnotation(ParametersDelegate.class);
Annotation dynamicParameter = f.getAnnotation(DynamicParameter.class);
if (annotation != null) {
//
// @Parameter
//
Parameter p = (Parameter) annotation;
if (p.names().length == 0) {
p("Found main parameter:" + f);
if (m_mainParameterField != null) {
throw new ParameterException("Only one @Parameter with no names attribute is"
+ " allowed, found:" + m_mainParameterField + " and " + f);
}
m_mainParameterField = f;
m_mainParameterObject = object;
m_mainParameterAnnotation = p;
m_mainParameterDescription = new ParameterDescription(object, p, f, m_bundle, this);
} else {
for (String name : p.names()) {
if (m_descriptions.containsKey(name)) {
throw new ParameterException("Found the option " + name + " multiple times");
}
p("Adding description for " + name);
ParameterDescription pd = new ParameterDescription(object, p, f, m_bundle, this);
m_fields.put(f, pd);
m_descriptions.put(name, pd);
if (p.required()) m_requiredFields.put(f, pd);
}
}
} else if (delegateAnnotation != null) {
//
// @ParametersDelegate
//
try {
Object delegateObject = f.get(object);
if (delegateObject == null){
throw new ParameterException("Delegate field '" + f.getName() + "' cannot be null.");
}
addDescription(delegateObject);
} catch (IllegalAccessException e) {
}
} else if (dynamicParameter != null) {
//
// @DynamicParameter
//
DynamicParameter dp = (DynamicParameter) dynamicParameter;
for (String name : dp.names()) {
if (m_descriptions.containsKey(name)) {
throw new ParameterException("Found the option " + name + " multiple times");
}
p("Adding description for " + name);
ParameterDescription pd = new ParameterDescription(object, dp, f, m_bundle, this);
m_fields.put(f, pd);
m_descriptions.put(name, pd);
if (dp.required()) m_requiredFields.put(f, pd);
}
}
}
// Traverse the super class until we find Object.class
cls = cls.getSuperclass();
}
}
private void initializeDefaultValue(ParameterDescription pd) {
String optionName = pd.getParameter().names()[0];
String def = m_defaultProvider.getDefaultValueFor(optionName);
if (def != null) {
p("Initializing " + optionName + " with default value:" + def);
pd.addValue(def, true /* default */);
}
}
/**
* Main method that parses the values and initializes the fields accordingly.
*/
private void parseValues(String[] args) {
// This boolean becomes true if we encounter a command, which indicates we need
// to stop parsing (the parsing of the command will be done in a sub JCommander
// object)
boolean commandParsed = false;
int i = 0;
while (i < args.length && ! commandParsed) {
String arg = args[i];
String a = trim(arg);
p("Parsing arg:" + a);
if (isOption(args, a)) {
//
// Option
//
ParameterDescription pd = m_descriptions.get(a);
if (pd != null) {
if (pd.getParameter().password()) {
//
// Password option, use the Console to retrieve the password
//
char[] password = readPassword(pd.getDescription());
pd.addValue(new String(password));
} else {
if (pd.getParameter().variableArity()) {
//
// Variable arity?
//
i = processVariableArity(args, i, pd);
} else {
//
// Regular option
//
Class<?> fieldType = pd.getField().getType();
// Boolean, set to true as soon as we see it, unless it specified
// an arity of 1, in which case we need to read the next value
if ((fieldType == boolean.class || fieldType == Boolean.class)
&& pd.getParameter().arity() == -1) {
pd.addValue("true");
m_requiredFields.remove(pd.getField());
} else {
i = processFixedArity(args, i, pd, fieldType);
}
}
}
} else {
throw new ParameterException("Unknown option: " + arg);
}
}
else {
//
// Main parameter
//
if (! isStringEmpty(arg)) {
if (m_commands.isEmpty()) {
//
// Regular (non-command) parsing
//
List mp = getMainParameter(arg);
String value = arg;
Object convertedValue = value;
if (m_mainParameterField.getGenericType() instanceof ParameterizedType) {
ParameterizedType p = (ParameterizedType) m_mainParameterField.getGenericType();
Type cls = p.getActualTypeArguments()[0];
if (cls instanceof Class) {
convertedValue = convertValue(m_mainParameterField, (Class) cls, value);
}
}
ParameterDescription.validateParameter(m_mainParameterAnnotation.validateWith(),
"Default", value);
m_mainParameterDescription.setAssigned(true);
mp.add(convertedValue);
}
else {
//
// Command parsing
//
JCommander jc = findCommandByAlias(arg);
if (jc == null) throw new MissingCommandException("Expected a command, got " + arg);
m_parsedCommand = jc.m_programName.m_name;
m_parsedAlias = arg; //preserve the original form
// Found a valid command, ask it to parse the remainder of the arguments.
// Setting the boolean commandParsed to true will force the current
// loop to end.
jc.parse(subArray(args, i + 1));
commandParsed = true;
}
}
}
i++;
}
// Mark the parameter descriptions held in m_fields as assigned
for (ParameterDescription parameterDescription : m_descriptions.values()) {
if (parameterDescription.isAssigned()) {
m_fields.get(parameterDescription.getField()).setAssigned(true);
}
}
}
/**
* @return the generic type of the collection for this field, or null if not applicable.
*/
private Type findFieldGenericType(Field field) {
if (field.getGenericType() instanceof ParameterizedType) {
ParameterizedType p = (ParameterizedType) field.getGenericType();
Type cls = p.getActualTypeArguments()[0];
if (cls instanceof Class) {
return cls;
}
}
return null;
}
/**
* @return the number of options that were processed.
*/
private int processVariableArity(String[] args, int index, ParameterDescription pd) {
Object arg = pd.getObject();
if (! (arg instanceof IVariableArity)) {
throw new ParameterException("Arg class " + arg.getClass()
+ " should implement IVariableArity");
}
IVariableArity va = (IVariableArity) arg;
List<String> currentArgs = Lists.newArrayList();
for (int j = index + 1; j < args.length; j++) {
currentArgs.add(args[j]);
}
int result = va.processVariableArity(pd.getParameter().names()[0],
currentArgs.toArray(new String[0]));
return result;
}
private int processFixedArity(String[] args, int index, ParameterDescription pd,
Class<?> fieldType) {
// Regular parameter, use the arity to tell use how many values
// we need to consume
String arg = args[index];
int arity = pd.getParameter().arity();
int n = (arity != -1 ? arity : 1);
// Special case for boolean parameters of arity 0
if (n == 0 &&
(Boolean.class.isAssignableFrom(fieldType)
|| boolean.class.isAssignableFrom(fieldType))) {
pd.addValue("true");
m_requiredFields.remove(pd.getField());
} else if (index < args.length - 1) {
int offset = "--".equals(args[index + 1]) ? 1 : 0;
if (index + n < args.length) {
for (int j = 1; j <= n; j++) {
pd.addValue(trim(args[index + j + offset]));
m_requiredFields.remove(pd.getField());
}
index += n + offset;
} else {
throw new ParameterException("Expected " + n + " values after " + arg);
}
} else {
throw new ParameterException("Expected a value after parameter " + arg);
}
return index;
}
/**
* Invoke Console.readPassword through reflection to avoid depending
* on Java 6.
*/
private char[] readPassword(String description) {
getConsole().print(description + ": ");
return getConsole().readPassword();
}
private String[] subArray(String[] args, int index) {
int l = args.length - index;
String[] result = new String[l];
System.arraycopy(args, index, result, 0, l);
return result;
}
private static boolean isStringEmpty(String s) {
return s == null || "".equals(s);
}
/**
* @return the field that's meant to receive all the parameters that are not options.
*
* @param arg the arg that we're about to add (only passed here to output a meaningful
* error message).
*/
private List<?> getMainParameter(String arg) {
if (m_mainParameterField == null) {
throw new ParameterException(
"Was passed main parameter '" + arg + "' but no main parameter was defined");
}
try {
List result = (List) m_mainParameterField.get(m_mainParameterObject);
if (result == null) {
result = Lists.newArrayList();
if (! List.class.isAssignableFrom(m_mainParameterField.getType())) {
throw new ParameterException("Main parameter field " + m_mainParameterField
+ " needs to be of type List, not " + m_mainParameterField.getType());
}
m_mainParameterField.set(m_mainParameterObject, result);
}
return result;
}
catch(IllegalAccessException ex) {
throw new ParameterException("Couldn't access main parameter: " + ex.getMessage());
}
}
public String getMainParameterDescription() {
if (m_descriptions == null) createDescriptions();
return m_mainParameterAnnotation != null ? m_mainParameterAnnotation.description()
: null;
}
private int longestName(Collection<?> objects) {
int result = 0;
for (Object o : objects) {
int l = o.toString().length();
if (l > result) result = l;
}
return result;
}
/**
* Set the program name (used only in the usage).
*/
public void setProgramName(String name) {
setProgramName(name, new String[0]);
}
/**
* Set the program name
*
* @param name program name
* @param aliases aliases to the program name
*/
public void setProgramName(String name, String... aliases) {
m_programName = new ProgramName(name, Arrays.asList(aliases));
}
/**
* Display the usage for this command.
*/
public void usage(String commandName) {
StringBuilder sb = new StringBuilder();
usage(commandName, sb);
getConsole().println(sb.toString());
}
/**
* Store the help for the command in the passed string builder.
*/
public void usage(String commandName, StringBuilder out) {
usage(commandName, out, "");
}
/**
* Store the help for the command in the passed string builder, indenting
* every line with "indent".
*/
public void usage(String commandName, StringBuilder out, String indent) {
String description = getCommandDescription(commandName);
JCommander jc = findCommandByAlias(commandName);
if (description != null) {
out.append(indent).append(description);
out.append("\n");
}
jc.usage(out, indent);
}
/**
* @return the description of the command.
*/
public String getCommandDescription(String commandName) {
JCommander jc = findCommandByAlias(commandName);
if (jc == null) {
throw new ParameterException("Asking description for unknown command: " + commandName);
}
Parameters p = jc.getObjects().get(0).getClass().getAnnotation(Parameters.class);
String result = jc.getMainParameterDescription();
if (p != null) result = getI18nString(p.commandDescriptionKey(), p.commandDescription());
return result;
}
/**
* @return The internationalized version of the string if available, otherwise
* return def.
*/
private String getI18nString(String key, String def) {
String s = m_bundle != null ? m_bundle.getString(key) : null;
return s != null ? s : def;
}
/**
* Display the help on System.out.
*/
public void usage() {
StringBuilder sb = new StringBuilder();
usage(sb);
getConsole().println(sb.toString());
}
/**
* Store the help in the passed string builder.
*/
public void usage(StringBuilder out) {
usage(out, "");
}
public void usage(StringBuilder out, String indent) {
if (m_descriptions == null) createDescriptions();
boolean hasCommands = !m_commands.isEmpty();
//
// First line of the usage
//
String programName = m_programName != null ? m_programName.getDisplayName() : "<main class>";
out.append(indent).append("Usage: " + programName + " [options]");
if (hasCommands) out.append(indent).append(" [command] [command options]");
// out.append("\n");
if (m_mainParameterDescription != null) {
out.append(" " + m_mainParameterDescription.getDescription());
}
//
// Align the descriptions at the "longestName" column
//
int longestName = 0;
List<ParameterDescription> sorted = Lists.newArrayList();
for (ParameterDescription pd : m_fields.values()) {
if (! pd.getParameter().hidden()) {
sorted.add(pd);
// + to have an extra space between the name and the description
int length = pd.getNames().length() + 2;
if (length > longestName) {
longestName = length;
}
}
}
//
// Sort the options
//
Collections.sort(sorted, getParameterDescriptionComparator());
//
// Display all the names and descriptions
//
if (sorted.size() > 0) out.append(indent).append("\n Options:\n");
for (ParameterDescription pd : sorted) {
int l = pd.getNames().length();
int spaceCount = longestName - l;
int start = out.length();
WrappedParameter parameter = pd.getParameter();
out.append(indent).append(" "
+ (parameter.required() ? "* " : " ")
+ pd.getNames() + s(spaceCount));
int indentCount = out.length() - start;
wrapDescription(out, indentCount, pd.getDescription());
Object def = pd.getDefault();
if (pd.isDynamicParameter()) {
out.append("\n" + spaces(indentCount + 1))
.append("Syntax: " + parameter.names()[0]
+ "key" + parameter.getAssignment()
+ "value");
}
if (def != null && ! "".equals(def)) {
out.append("\n" + spaces(indentCount + 1))
.append("Default: " + def);
}
out.append("\n");
}
//
// If commands were specified, show them as well
//
if (hasCommands) {
out.append(" Commands:\n");
// The magic value 3 is the number of spaces between the name of the option
// and its description
for (Map.Entry<ProgramName, JCommander> commands : m_commands.entrySet()) {
ProgramName progName = commands.getKey();
String dispName = progName.getDisplayName();
out.append(indent).append(" " + dispName); // + s(spaceCount) + getCommandDescription(progName.name) + "\n");
// Options for this command
usage(progName.getName(), out, " ");
out.append("\n");
}
}
}
private Comparator<? super ParameterDescription> getParameterDescriptionComparator() {
return m_parameterDescriptionComparator;
}
public void setParameterDescriptionComparator(Comparator<? super ParameterDescription> c) {
m_parameterDescriptionComparator = c;
}
public void setColumnSize(int columnSize) {
m_columnSize = columnSize;
}
public int getColumnSize() {
return m_columnSize;
}
private void wrapDescription(StringBuilder out, int indent, String description) {
int max = getColumnSize();
String[] words = description.split(" ");
int current = indent;
int i = 0;
while (i < words.length) {
String word = words[i];
if (word.length() > max || current + word.length() <= max) {
out.append(" ").append(word);
current += word.length() + 1;
} else {
out.append("\n").append(spaces(indent + 1)).append(word);
current = indent;
}
i++;
}
}
private String spaces(int indent) {
StringBuilder sb = new StringBuilder();
for (int i = 0; i < indent; i++) sb.append(" ");
return sb.toString();
}
/**
* @return a Collection of all the \@Parameter annotations found on the
* target class. This can be used to display the usage() in a different
* format (e.g. HTML).
*/
public List<ParameterDescription> getParameters() {
return new ArrayList<ParameterDescription>(m_fields.values());
}
/**
* @return the main parameter description or null if none is defined.
*/
public ParameterDescription getMainParameter() {
return m_mainParameterDescription;
}
private void p(String string) {
if (System.getProperty(JCommander.DEBUG_PROPERTY) != null) {
getConsole().println("[JCommander] " + string);
}
}
/**
* Define the default provider for this instance.
*/
public void setDefaultProvider(IDefaultProvider defaultProvider) {
m_defaultProvider = defaultProvider;
for (Map.Entry<ProgramName, JCommander> entry : m_commands.entrySet()) {
entry.getValue().setDefaultProvider(defaultProvider);
}
}
public void addConverterFactory(IStringConverterFactory converterFactory) {
CONVERTER_FACTORIES.addFirst(converterFactory);
}
public <T> Class<? extends IStringConverter<T>> findConverter(Class<T> cls) {
for (IStringConverterFactory f : CONVERTER_FACTORIES) {
Class<? extends IStringConverter<T>> result = f.getConverter(cls);
if (result != null) return result;
}
return null;
}
public Object convertValue(ParameterDescription pd, String value) {
return convertValue(pd.getField(), pd.getField().getType(), value);
}
/**
* @param field The field
* @param type The type of the actual parameter
* @param value The value to convert
*/
public Object convertValue(Field field, Class type, String value) {
Parameter annotation = field.getAnnotation(Parameter.class);
// Do nothing if it's a @DynamicParameter
if (annotation == null) return value;
Class<? extends IStringConverter<?>> converterClass = annotation.converter();
boolean listConverterWasSpecified = annotation.listConverter() != NoConverter.class;
//
// Try to find a converter on the annotation
//
if (converterClass == null || converterClass == NoConverter.class) {
// If no converter specified and type is enum, used enum values to convert
if (type.isEnum()){
converterClass = type;
} else {
converterClass = findConverter(type);
}
}
if (converterClass == null) {
Type elementType = findFieldGenericType(field);
converterClass = elementType != null
? findConverter((Class<? extends IStringConverter<?>>) elementType)
: StringConverter.class;
}
//
// //
// // Try to find a converter in the factory
// //
// IStringConverter<?> converter = null;
// if (converterClass == null && m_converterFactories != null) {
// // Mmmh, javac requires a cast here
// converter = (IStringConverter) m_converterFactories.getConverter(type);
// }
// if (converterClass == null) {
// throw new ParameterException("Don't know how to convert " + value
// + " to type " + type + " (field: " + field.getName() + ")");
// }
IStringConverter<?> converter;
Object result = null;
try {
String[] names = annotation.names();
String optionName = names.length > 0 ? names[0] : "[Main class]";
if (converterClass.isEnum()) {
try {
result = Enum.valueOf((Class<? extends Enum>) converterClass, value.toUpperCase());
} catch (Exception e) {
throw new ParameterException("Invalid value for " + optionName + " parameter. Allowed values:" +
EnumSet.allOf((Class<? extends Enum>) converterClass));
}
} else {
converter = instantiateConverter(optionName, converterClass);
if (type.isAssignableFrom(List.class)
&& field.getGenericType() instanceof ParameterizedType) {
// The field is a List
if (listConverterWasSpecified) {
// If a list converter was specified, pass the value to it
// for direct conversion
IStringConverter<?> listConverter =
instantiateConverter(optionName, annotation.listConverter());
result = listConverter.convert(value);
} else {
// No list converter: use the single value converter and pass each
// parsed value to it individually
result = convertToList(value, converter, annotation.splitter());
}
} else {
result = converter.convert(value);
}
}
} catch (InstantiationException e) {
throw new ParameterException(e);
} catch (IllegalAccessException e) {
throw new ParameterException(e);
} catch (InvocationTargetException e) {
throw new ParameterException(e);
}
return result;
}
/**
* Use the splitter to split the value into multiple values and then convert
* each of them individually.
*/
private Object convertToList(String value, IStringConverter<?> converter,
Class<? extends IParameterSplitter> splitterClass)
throws InstantiationException, IllegalAccessException {
IParameterSplitter splitter = splitterClass.newInstance();
List<Object> result = Lists.newArrayList();
for (String param : splitter.split(value)) {
result.add(converter.convert(param));
}
return result;
}
private IStringConverter<?> instantiateConverter(String optionName,
Class<? extends IStringConverter<?>> converterClass)
throws IllegalArgumentException, InstantiationException, IllegalAccessException,
InvocationTargetException {
Constructor<IStringConverter<?>> ctor = null;
Constructor<IStringConverter<?>> stringCtor = null;
Constructor<IStringConverter<?>>[] ctors
= (Constructor<IStringConverter<?>>[]) converterClass.getDeclaredConstructors();
for (Constructor<IStringConverter<?>> c : ctors) {
Class<?>[] types = c.getParameterTypes();
if (types.length == 1 && types[0].equals(String.class)) {
stringCtor = c;
} else if (types.length == 0) {
ctor = c;
}
}
IStringConverter<?> result = stringCtor != null
? stringCtor.newInstance(optionName)
: ctor.newInstance();
return result;
}
/**
* Add a command object.
*/
public void addCommand(String name, Object object) {
addCommand(name, object, new String[0]);
}
public void addCommand(Object object) {
Parameters p = object.getClass().getAnnotation(Parameters.class);
if (p != null && p.commandNames().length > 0) {
for (String commandName : p.commandNames()) {
addCommand(commandName, object);
}
} else {
throw new ParameterException("Trying to add command " + object.getClass().getName()
+ " without specifying its names in @Parameters");
}
}
/**
* Add a command object and its aliases.
*/
public void addCommand(String name, Object object, String... aliases) {
JCommander jc = new JCommander(object);
jc.setProgramName(name, aliases);
jc.setDefaultProvider(m_defaultProvider);
ProgramName progName = jc.m_programName;
m_commands.put(progName, jc);
/*
* Register aliases
*/
//register command name as an alias of itself for reverse lookup
//Note: Name clash check is intentionally omitted to resemble the
// original behaviour of clashing commands.
// Aliases are, however, are strictly checked for name clashes.
aliasMap.put(name, progName);
for (String alias : aliases) {
//omit pointless aliases to avoid name clash exception
if (!alias.equals(name)) {
ProgramName mappedName = aliasMap.get(alias);
if (mappedName != null && !mappedName.equals(progName)) {
throw new ParameterException("Cannot set alias " + alias
+ " for " + name
+ " command because it has already been defined for "
+ mappedName.m_name + " command");
}
aliasMap.put(alias, progName);
}
}
}
public Map<String, JCommander> getCommands() {
Map<String, JCommander> res = Maps.newLinkedHashMap();
for (Map.Entry<ProgramName, JCommander> entry : m_commands.entrySet()) {
res.put(entry.getKey().m_name, entry.getValue());
}
return res;
}
public String getParsedCommand() {
return m_parsedCommand;
}
/**
* The name of the command or the alias in the form it was
* passed to the command line. <code>null</code> if no
* command or alias was specified.
*
* @return Name of command or alias passed to command line. If none passed: <code>null</code>.
*/
public String getParsedAlias() {
return m_parsedAlias;
}
/**
* @return n spaces
*/
private String s(int count) {
StringBuilder result = new StringBuilder();
for (int i = 0; i < count; i++) {
result.append(" ");
}
return result.toString();
}
/**
* @return the objects that JCommander will fill with the result of
* parsing the command line.
*/
public List<Object> getObjects() {
return m_objects;
}
/*
* Reverse lookup JCommand object by command's name or its alias
*/
private JCommander findCommandByAlias(String commandOrAlias) {
ProgramName progName = aliasMap.get(commandOrAlias);
if (progName == null) {
return null;
}
JCommander jc = m_commands.get(progName);
if (jc == null) {
throw new IllegalStateException(
"There appears to be inconsistency in the internal command database. " +
" This is likely a bug. Please report.");
}
return jc;
}
private static final class ProgramName {
private final String m_name;
private final List<String> m_aliases;
ProgramName(String name, List<String> aliases) {
m_name = name;
m_aliases = aliases;
}
public String getName() {
return m_name;
}
private String getDisplayName() {
StringBuilder sb = new StringBuilder();
sb.append(m_name);
if (!m_aliases.isEmpty()) {
sb.append("(");
Iterator<String> aliasesIt = m_aliases.iterator();
while (aliasesIt.hasNext()) {
sb.append(aliasesIt.next());
if (aliasesIt.hasNext()) {
sb.append(",");
}
}
sb.append(")");
}
return sb.toString();
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((m_name == null) ? 0 : m_name.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
ProgramName other = (ProgramName) obj;
if (m_name == null) {
if (other.m_name != null)
return false;
} else if (!m_name.equals(other.m_name))
return false;
return true;
}
/*
* Important: ProgramName#toString() is used by longestName(Collection) function
* to format usage output.
*/
@Override
public String toString() {
return getDisplayName();
}
}
}