org.apache.commons.cli.Option Maven / Gradle / Ivy
/**
* 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.commons.cli;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
/**
* Describes a single command-line option. It maintains
* information regarding the short-name of the option, the long-name,
* if any exists, a flag indicating if an argument is required for
* this option, and a self-documenting description of the option.
*
* An Option is not created independently, but is created through
* an instance of {@link Options}. An Option is required to have
* at least a short or a long-name.
*
* Note: once an {@link Option} has been added to an instance
* of {@link Options}, it's required flag may not be changed anymore.
*
* @see org.apache.commons.cli.Options
* @see org.apache.commons.cli.CommandLine
*
* @version $Id: Option.java 1677406 2015-05-03 14:27:31Z britter $
*/
public class Option implements Cloneable, Serializable
{
/** constant that specifies the number of argument values has not been specified */
public static final int UNINITIALIZED = -1;
/** constant that specifies the number of argument values is infinite */
public static final int UNLIMITED_VALUES = -2;
/** The serial version UID. */
private static final long serialVersionUID = 1L;
/** the name of the option */
private final String opt;
/** the long representation of the option */
private String longOpt;
/** the name of the argument for this option */
private String argName;
/** description of the option */
private String description;
/** specifies whether this option is required to be present */
private boolean required;
/** specifies whether the argument value of this Option is optional */
private boolean optionalArg;
/** the number of argument values this option can have */
private int numberOfArgs = UNINITIALIZED;
/** the type of this Option */
private Class type = String.class;
/** the list of argument values **/
private List values = new ArrayList();
/** the character that is the value separator */
private char valuesep;
/**
* Private constructor used by the nested Builder class.
*
* @param builder builder used to create this option
*/
private Option(final Builder builder)
{
this.argName = builder.argName;
this.description = builder.description;
this.longOpt = builder.longOpt;
this.numberOfArgs = builder.numberOfArgs;
this.opt = builder.opt;
this.optionalArg = builder.optionalArg;
this.required = builder.required;
this.type = builder.type;
this.valuesep = builder.valuesep;
}
/**
* Creates an Option using the specified parameters.
* The option does not take an argument.
*
* @param opt short representation of the option
* @param description describes the function of the option
*
* @throws IllegalArgumentException if there are any non valid
* Option characters in opt.
*/
public Option(String opt, String description) throws IllegalArgumentException
{
this(opt, null, false, description);
}
/**
* Creates an Option using the specified parameters.
*
* @param opt short representation of the option
* @param hasArg specifies whether the Option takes an argument or not
* @param description describes the function of the option
*
* @throws IllegalArgumentException if there are any non valid
* Option characters in opt.
*/
public Option(String opt, boolean hasArg, String description) throws IllegalArgumentException
{
this(opt, null, hasArg, description);
}
/**
* Creates an Option using the specified parameters.
*
* @param opt short representation of the option
* @param longOpt the long representation of the option
* @param hasArg specifies whether the Option takes an argument or not
* @param description describes the function of the option
*
* @throws IllegalArgumentException if there are any non valid
* Option characters in opt.
*/
public Option(String opt, String longOpt, boolean hasArg, String description)
throws IllegalArgumentException
{
// ensure that the option is valid
OptionValidator.validateOption(opt);
this.opt = opt;
this.longOpt = longOpt;
// if hasArg is set then the number of arguments is 1
if (hasArg)
{
this.numberOfArgs = 1;
}
this.description = description;
}
/**
* Returns the id of this Option. This is only set when the
* Option shortOpt is a single character. This is used for switch
* statements.
*
* @return the id of this Option
*/
public int getId()
{
return getKey().charAt(0);
}
/**
* Returns the 'unique' Option identifier.
*
* @return the 'unique' Option identifier
*/
String getKey()
{
// if 'opt' is null, then it is a 'long' option
return (opt == null) ? longOpt : opt;
}
/**
* Retrieve the name of this Option.
*
* It is this String which can be used with
* {@link CommandLine#hasOption(String opt)} and
* {@link CommandLine#getOptionValue(String opt)} to check
* for existence and argument.
*
* @return The name of this option
*/
public String getOpt()
{
return opt;
}
/**
* Retrieve the type of this Option.
*
* @return The type of this option
*/
public Object getType()
{
return type;
}
/**
* Sets the type of this Option.
*
* Note: this method is kept for binary compatibility and the
* input type is supposed to be a {@link Class} object.
*
* @param type the type of this Option
* @deprecated since 1.3, use {@link #setType(Class)} instead
*/
@Deprecated
public void setType(Object type)
{
setType((Class) type);
}
/**
* Sets the type of this Option.
*
* @param type the type of this Option
* @since 1.3
*/
public void setType(Class type)
{
this.type = type;
}
/**
* Retrieve the long name of this Option.
*
* @return Long name of this option, or null, if there is no long name
*/
public String getLongOpt()
{
return longOpt;
}
/**
* Sets the long name of this Option.
*
* @param longOpt the long name of this Option
*/
public void setLongOpt(String longOpt)
{
this.longOpt = longOpt;
}
/**
* Sets whether this Option can have an optional argument.
*
* @param optionalArg specifies whether the Option can have
* an optional argument.
*/
public void setOptionalArg(boolean optionalArg)
{
this.optionalArg = optionalArg;
}
/**
* @return whether this Option can have an optional argument
*/
public boolean hasOptionalArg()
{
return optionalArg;
}
/**
* Query to see if this Option has a long name
*
* @return boolean flag indicating existence of a long name
*/
public boolean hasLongOpt()
{
return longOpt != null;
}
/**
* Query to see if this Option requires an argument
*
* @return boolean flag indicating if an argument is required
*/
public boolean hasArg()
{
return numberOfArgs > 0 || numberOfArgs == UNLIMITED_VALUES;
}
/**
* Retrieve the self-documenting description of this Option
*
* @return The string description of this option
*/
public String getDescription()
{
return description;
}
/**
* Sets the self-documenting description of this Option
*
* @param description The description of this option
* @since 1.1
*/
public void setDescription(String description)
{
this.description = description;
}
/**
* Query to see if this Option is mandatory
*
* @return boolean flag indicating whether this Option is mandatory
*/
public boolean isRequired()
{
return required;
}
/**
* Sets whether this Option is mandatory.
*
* @param required specifies whether this Option is mandatory
*/
public void setRequired(boolean required)
{
this.required = required;
}
/**
* Sets the display name for the argument value.
*
* @param argName the display name for the argument value.
*/
public void setArgName(String argName)
{
this.argName = argName;
}
/**
* Gets the display name for the argument value.
*
* @return the display name for the argument value.
*/
public String getArgName()
{
return argName;
}
/**
* Returns whether the display name for the argument value has been set.
*
* @return if the display name for the argument value has been set.
*/
public boolean hasArgName()
{
return argName != null && argName.length() > 0;
}
/**
* Query to see if this Option can take many values.
*
* @return boolean flag indicating if multiple values are allowed
*/
public boolean hasArgs()
{
return numberOfArgs > 1 || numberOfArgs == UNLIMITED_VALUES;
}
/**
* Sets the number of argument values this Option can take.
*
* @param num the number of argument values
*/
public void setArgs(int num)
{
this.numberOfArgs = num;
}
/**
* Sets the value separator. For example if the argument value
* was a Java property, the value separator would be '='.
*
* @param sep The value separator.
*/
public void setValueSeparator(char sep)
{
this.valuesep = sep;
}
/**
* Returns the value separator character.
*
* @return the value separator character.
*/
public char getValueSeparator()
{
return valuesep;
}
/**
* Return whether this Option has specified a value separator.
*
* @return whether this Option has specified a value separator.
* @since 1.1
*/
public boolean hasValueSeparator()
{
return valuesep > 0;
}
/**
* Returns the number of argument values this Option can take.
*
* @return num the number of argument values
*/
public int getArgs()
{
return numberOfArgs;
}
/**
* Adds the specified value to this Option.
*
* @param value is a/the value of this Option
*/
void addValueForProcessing(String value)
{
if (numberOfArgs == UNINITIALIZED)
{
throw new RuntimeException("NO_ARGS_ALLOWED");
}
processValue(value);
}
/**
* Processes the value. If this Option has a value separator
* the value will have to be parsed into individual tokens. When
* n-1 tokens have been processed and there are more value separators
* in the value, parsing is ceased and the remaining characters are
* added as a single token.
*
* @param value The String to be processed.
*
* @since 1.0.1
*/
private void processValue(String value)
{
// this Option has a separator character
if (hasValueSeparator())
{
// get the separator character
char sep = getValueSeparator();
// store the index for the value separator
int index = value.indexOf(sep);
// while there are more value separators
while (index != -1)
{
// next value to be added
if (values.size() == numberOfArgs - 1)
{
break;
}
// store
add(value.substring(0, index));
// parse
value = value.substring(index + 1);
// get new index
index = value.indexOf(sep);
}
}
// store the actual value or the last value that has been parsed
add(value);
}
/**
* Add the value to this Option. If the number of arguments
* is greater than zero and there is enough space in the list then
* add the value. Otherwise, throw a runtime exception.
*
* @param value The value to be added to this Option
*
* @since 1.0.1
*/
private void add(String value)
{
if (!acceptsArg())
{
throw new RuntimeException("Cannot add value, list full.");
}
// store value
values.add(value);
}
/**
* Returns the specified value of this Option or
* null if there is no value.
*
* @return the value/first value of this Option or
* null if there is no value.
*/
public String getValue()
{
return hasNoValues() ? null : values.get(0);
}
/**
* Returns the specified value of this Option or
* null if there is no value.
*
* @param index The index of the value to be returned.
*
* @return the specified value of this Option or
* null if there is no value.
*
* @throws IndexOutOfBoundsException if index is less than 1
* or greater than the number of the values for this Option.
*/
public String getValue(int index) throws IndexOutOfBoundsException
{
return hasNoValues() ? null : values.get(index);
}
/**
* Returns the value/first value of this Option or the
* defaultValue if there is no value.
*
* @param defaultValue The value to be returned if there
* is no value.
*
* @return the value/first value of this Option or the
* defaultValue if there are no values.
*/
public String getValue(String defaultValue)
{
String value = getValue();
return (value != null) ? value : defaultValue;
}
/**
* Return the values of this Option as a String array
* or null if there are no values
*
* @return the values of this Option as a String array
* or null if there are no values
*/
public String[] getValues()
{
return hasNoValues() ? null : values.toArray(new String[values.size()]);
}
/**
* @return the values of this Option as a List
* or null if there are no values
*/
public List getValuesList()
{
return values;
}
/**
* Dump state, suitable for debugging.
*
* @return Stringified form of this object
*/
@Override
public String toString()
{
StringBuilder buf = new StringBuilder().append("[ option: ");
buf.append(opt);
if (longOpt != null)
{
buf.append(" ").append(longOpt);
}
buf.append(" ");
if (hasArgs())
{
buf.append("[ARG...]");
}
else if (hasArg())
{
buf.append(" [ARG]");
}
buf.append(" :: ").append(description);
if (type != null)
{
buf.append(" :: ").append(type);
}
buf.append(" ]");
return buf.toString();
}
/**
* Returns whether this Option has any values.
*
* @return whether this Option has any values.
*/
private boolean hasNoValues()
{
return values.isEmpty();
}
@Override
public boolean equals(Object o)
{
if (this == o)
{
return true;
}
if (o == null || getClass() != o.getClass())
{
return false;
}
Option option = (Option) o;
if (opt != null ? !opt.equals(option.opt) : option.opt != null)
{
return false;
}
if (longOpt != null ? !longOpt.equals(option.longOpt) : option.longOpt != null)
{
return false;
}
return true;
}
@Override
public int hashCode()
{
int result;
result = opt != null ? opt.hashCode() : 0;
result = 31 * result + (longOpt != null ? longOpt.hashCode() : 0);
return result;
}
/**
* A rather odd clone method - due to incorrect code in 1.0 it is public
* and in 1.1 rather than throwing a CloneNotSupportedException it throws
* a RuntimeException so as to maintain backwards compat at the API level.
*
* After calling this method, it is very likely you will want to call
* clearValues().
*
* @return a clone of this Option instance
* @throws RuntimeException if a {@link CloneNotSupportedException} has been thrown
* by {@code super.clone()}
*/
@Override
public Object clone()
{
try
{
Option option = (Option) super.clone();
option.values = new ArrayList(values);
return option;
}
catch (CloneNotSupportedException cnse)
{
throw new RuntimeException("A CloneNotSupportedException was thrown: " + cnse.getMessage());
}
}
/**
* Clear the Option values. After a parse is complete, these are left with
* data in them and they need clearing if another parse is done.
*
* See: CLI-71
*/
void clearValues()
{
values.clear();
}
/**
* This method is not intended to be used. It was a piece of internal
* API that was made public in 1.0. It currently throws an UnsupportedOperationException.
*
* @param value the value to add
* @return always throws an {@link UnsupportedOperationException}
* @throws UnsupportedOperationException always
* @deprecated
*/
@Deprecated
public boolean addValue(String value)
{
throw new UnsupportedOperationException("The addValue method is not intended for client use. "
+ "Subclasses should use the addValueForProcessing method instead. ");
}
/**
* Tells if the option can accept more arguments.
*
* @return false if the maximum number of arguments is reached
* @since 1.3
*/
boolean acceptsArg()
{
return (hasArg() || hasArgs() || hasOptionalArg()) && (numberOfArgs <= 0 || values.size() < numberOfArgs);
}
/**
* Tells if the option requires more arguments to be valid.
*
* @return false if the option doesn't require more arguments
* @since 1.3
*/
boolean requiresArg()
{
if (optionalArg)
{
return false;
}
if (numberOfArgs == UNLIMITED_VALUES)
{
return values.isEmpty();
}
return acceptsArg();
}
/**
* Returns a {@link Builder} to create an {@link Option} using descriptive
* methods.
*
* @return a new {@link Builder} instance
* @since 1.3
*/
public static Builder builder()
{
return builder(null);
}
/**
* Returns a {@link Builder} to create an {@link Option} using descriptive
* methods.
*
* @param opt short representation of the option
* @return a new {@link Builder} instance
* @throws IllegalArgumentException if there are any non valid Option characters in {@code opt}
* @since 1.3
*/
public static Builder builder(final String opt)
{
return new Builder(opt);
}
/**
* A nested builder class to create Option instances
* using descriptive methods.
*
* Example usage:
*
* Option option = Option.builder("a")
* .required(true)
* .longOpt("arg-name")
* .build();
*
*
* @since 1.3
*/
public static final class Builder
{
/** the name of the option */
private final String opt;
/** description of the option */
private String description;
/** the long representation of the option */
private String longOpt;
/** the name of the argument for this option */
private String argName;
/** specifies whether this option is required to be present */
private boolean required;
/** specifies whether the argument value of this Option is optional */
private boolean optionalArg;
/** the number of argument values this option can have */
private int numberOfArgs = UNINITIALIZED;
/** the type of this Option */
private Class type = String.class;
/** the character that is the value separator */
private char valuesep;
/**
* Constructs a new Builder with the minimum
* required parameters for an Option instance.
*
* @param opt short representation of the option
* @throws IllegalArgumentException if there are any non valid Option characters in {@code opt}
*/
private Builder(final String opt) throws IllegalArgumentException
{
OptionValidator.validateOption(opt);
this.opt = opt;
}
/**
* Sets the display name for the argument value.
*
* @param argName the display name for the argument value.
* @return this builder, to allow method chaining
*/
public Builder argName(final String argName)
{
this.argName = argName;
return this;
}
/**
* Sets the description for this option.
*
* @param description the description of the option.
* @return this builder, to allow method chaining
*/
public Builder desc(final String description)
{
this.description = description;
return this;
}
/**
* Sets the long name of the Option.
*
* @param longOpt the long name of the Option
* @return this builder, to allow method chaining
*/
public Builder longOpt(final String longOpt)
{
this.longOpt = longOpt;
return this;
}
/**
* Sets the number of argument values the Option can take.
*
* @param numberOfArgs the number of argument values
* @return this builder, to allow method chaining
*/
public Builder numberOfArgs(final int numberOfArgs)
{
this.numberOfArgs = numberOfArgs;
return this;
}
/**
* Sets whether the Option can have an optional argument.
*
* @param isOptional specifies whether the Option can have
* an optional argument.
* @return this builder, to allow method chaining
*/
public Builder optionalArg(final boolean isOptional)
{
this.optionalArg = isOptional;
return this;
}
/**
* Marks this Option as required.
*
* @return this builder, to allow method chaining
*/
public Builder required()
{
return required(true);
}
/**
* Sets whether the Option is mandatory.
*
* @param required specifies whether the Option is mandatory
* @return this builder, to allow method chaining
*/
public Builder required(final boolean required)
{
this.required = required;
return this;
}
/**
* Sets the type of the Option.
*
* @param type the type of the Option
* @return this builder, to allow method chaining
*/
public Builder type(final Class type)
{
this.type = type;
return this;
}
/**
* The Option will use '=' as a means to separate argument value.
*
* @return this builder, to allow method chaining
*/
public Builder valueSeparator()
{
return valueSeparator('=');
}
/**
* The Option will use sep as a means to
* separate argument values.
*
* Example:
*
* Option opt = Option.builder("D").hasArgs()
* .valueSeparator('=')
* .build();
* Options options = new Options();
* options.addOption(opt);
* String[] args = {"-Dkey=value"};
* CommandLineParser parser = new DefaultParser();
* CommandLine line = parser.parse(options, args);
* String propertyName = line.getOptionValues("D")[0]; // will be "key"
* String propertyValue = line.getOptionValues("D")[1]; // will be "value"
*
*
* @param sep The value separator.
* @return this builder, to allow method chaining
*/
public Builder valueSeparator(final char sep)
{
valuesep = sep;
return this;
}
/**
* Indicates that the Option will require an argument.
*
* @return this builder, to allow method chaining
*/
public Builder hasArg()
{
return hasArg(true);
}
/**
* Indicates if the Option has an argument or not.
*
* @param hasArg specifies whether the Option takes an argument or not
* @return this builder, to allow method chaining
*/
public Builder hasArg(final boolean hasArg)
{
// set to UNINITIALIZED when no arg is specified to be compatible with OptionBuilder
numberOfArgs = hasArg ? 1 : Option.UNINITIALIZED;
return this;
}
/**
* Indicates that the Option can have unlimited argument values.
*
* @return this builder, to allow method chaining
*/
public Builder hasArgs()
{
numberOfArgs = Option.UNLIMITED_VALUES;
return this;
}
/**
* Constructs an Option with the values declared by this {@link Builder}.
*
* @return the new {@link Option}
* @throws IllegalArgumentException if neither {@code opt} or {@code longOpt} has been set
*/
public Option build()
{
if (opt == null && longOpt == null)
{
throw new IllegalArgumentException("Either opt or longOpt must be specified");
}
return new Option(this);
}
}
}