com.aspectran.shell.command.option.Option Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2019 The Aspectran Project
*
* 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.aspectran.shell.command.option;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
/**
* 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 Options
* @see ParsedOptions
*/
public class Option implements Cloneable, Serializable {
/** @serial */
private static final long serialVersionUID = -7707766888283034409L;
/** 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 name of the option */
private final String name;
/** The long representation of the option */
private String longName;
/** The name of the argument value for this option */
private String valueName;
/** The Option will use '=' as a means to separate argument value */
private boolean withEqualSign;
/** 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 optionalValue;
/** The number of argument values this option can have */
private int numberOfValues = UNINITIALIZED;
/** The type of this Option */
private OptionValueType valueType = OptionValueType.STRING;
/** The list of argument values **/
private List values = new ArrayList<>();
/**
* Private constructor used by the nested Builder class.
*
* @param builder builder used to create this option
*/
private Option(Builder builder) {
this.name = builder.name;
this.longName = builder.longName;
this.valueName = builder.valueName;
this.valueType = builder.valueType;
this.withEqualSign = builder.withEqualSign;
this.numberOfValues = builder.numberOfValues;
this.optionalValue = builder.optionalValue;
this.required = builder.required;
this.description = builder.description;
}
/**
* Creates an Option using the specified parameters.
* The option does not take an argument.
*
* @param name short representation of the option
* @param description describes the function of the option
* @throws IllegalArgumentException if there are any non valid
* Option characters in {@code name}
*/
public Option(String name, String description) throws IllegalArgumentException {
this(name, null, false, description);
}
/**
* Creates an Option using the specified parameters.
*
* @param name short representation of the option
* @param hasValue specifies whether the Option takes an argument value or not
* @param description describes the function of the option
* @throws IllegalArgumentException if there are any non valid
* Option characters in {@code name}
*/
public Option(String name, boolean hasValue, String description) throws IllegalArgumentException {
this(name, null, hasValue, description);
}
/**
* Creates an Option using the specified parameters.
*
* @param name short representation of the option
* @param longName the long representation of the option
* @param hasValue specifies whether the Option takes an argument value or not
* @param description describes the function of the option
* @throws IllegalArgumentException if there are any non valid
* Option characters in {@code name}
*/
public Option(String name, String longName, boolean hasValue, String description)
throws IllegalArgumentException {
// ensure that the option is valid
OptionUtils.validateOption(name);
this.name = name;
this.longName = longName;
// if hasValue is set then the number of arguments is 1
if (hasValue) {
this.numberOfValues = 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
*/
public String getKey() {
// if 'opt' is null, then it is a 'long' option
return (name == null ? longName : name);
}
/**
* Retrieve the name of this Option.
*
* It is this String which can be used with
* {@link ParsedOptions#hasOption(String name)} and
* {@link ParsedOptions#getValue(String name)} to check
* for existence and argument.
*
* @return the name of this option
*/
public String getName() {
return name;
}
/**
* Retrieve the long name of this Option.
*
* @return the long name of this Option, or null, if there is no long name
*/
public String getLongName() {
return longName;
}
/**
* Sets the long name of this Option.
*
* @param longName the long name of this Option
*/
public void setLongName(String longName) {
this.longName = longName;
}
/**
* Query to see if this Option has a long name.
*
* @return boolean flag indicating existence of a long name
*/
public boolean hasLongName() {
return longName != null;
}
/**
* Gets the display name for the argument value.
*
* @return the display name for the argument value
*/
public String getValueName() {
return valueName;
}
/**
* Sets the display name for the argument value.
*
* @param valueName the display name for the argument value
*/
public void setValueName(String valueName) {
this.valueName = valueName;
}
/**
* 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 hasValueName() {
return (valueName != null && valueName.length() > 0);
}
/**
* Retrieve the type of this Option.
*
* @return the type of this option
*/
public OptionValueType getValueType() {
return valueType;
}
/**
* Sets the type of this Option.
*
* @param valueType the type of this Option
*/
public void setValueType(OptionValueType valueType) {
this.valueType = valueType;
}
/**
* Sets whether this Option can have an optional argument.
*
* @param optionalValue specifies whether the Option can have
* an optional argument.
*/
public void setOptionalValue(boolean optionalValue) {
this.optionalValue = optionalValue;
}
/**
* Returns whether this Option can have an optional argument.
*
* @return whether this Option can have an optional argument
*/
public boolean hasOptionalValue() {
return optionalValue;
}
/**
* Returns the number of argument values this Option can take.
*
*
* A value equal to the constant {@link #UNINITIALIZED} (= -1) indicates
* the number of arguments has not been specified.
* A value equal to the constant {@link #UNLIMITED_VALUES} (= -2) indicates
* that this options takes an unlimited amount of values.
*
*
* @return num the number of argument values
* @see #UNINITIALIZED
* @see #UNLIMITED_VALUES
*/
public int getNumberOfValues() {
return numberOfValues;
}
/**
* Sets the number of argument values this Option can take.
*
* @param num the number of argument values
*/
public void setNumberOfValues(int num) {
this.numberOfValues = num;
}
/**
* Query to see if this Option requires an argument.
*
* @return boolean flag indicating if an argument is required
*/
public boolean hasValue() {
return (numberOfValues > 0 || numberOfValues == UNLIMITED_VALUES);
}
/**
* Query to see if this Option can take many values.
*
* @return boolean flag indicating if multiple values are allowed
*/
public boolean hasValues() {
return (numberOfValues > 1 || numberOfValues == UNLIMITED_VALUES);
}
public void withEqualSign() {
setWithEqualSign(true);
}
public boolean isWithEqualSign() {
return withEqualSign;
}
public void setWithEqualSign(boolean withEqualSign) {
this.withEqualSign = withEqualSign;
}
/**
* Adds the specified value to this Option.
*
* @param value is a/the value of this Option
*/
public void addValue(String value) {
if (numberOfValues == UNINITIALIZED) {
throw new RuntimeException("NO_ARGS_ALLOWED");
}
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
*/
private void add(String value) {
if (!acceptsValue()) {
throw new RuntimeException("Cannot add value, list full");
}
// store value
values.add(value);
}
/**
* Returns the specified value of this Option or
* {@code null} if there is no value.
*
* @return the value/first value of this Option or
* {@code null} if there is no value
*/
public String getValue() {
return (hasNoValues() ? null : values.get(0));
}
/**
* Returns the specified value of this Option or
* {@code null} if there is no value.
*
* @param index the index of the value to be returned.
* @return the specified value of this Option or
* {@code 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[0]));
}
/**
* Returns the values of this Option as a List
* or null if there are no values.
*
* @return the values of this Option as a List
* or null if there are no values
*/
public List getValuesList() {
return values;
}
/**
* Returns whether this Option has any values.
*
* @return true if this Option has no value; false otherwise
*/
private boolean hasNoValues() {
return values.isEmpty();
}
/**
* 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;
}
/**
* 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
*/
public void setDescription(String description) {
this.description = description;
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
Option option = (Option)o;
if (!Objects.equals(name, option.name)) {
return false;
}
if (!Objects.equals(longName, option.longName)) {
return false;
}
return true;
}
@Override
public int hashCode() {
int result;
result = (name != null ? name.hashCode() : 0);
result = 31 * result + (longName != null ? longName.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 Option clone() {
try {
Option option = (Option)super.clone();
option.values = new ArrayList<>(values);
return option;
} catch (CloneNotSupportedException e) {
throw new RuntimeException("A CloneNotSupportedException was thrown: " + e.getMessage());
}
}
/**
* Dump state, suitable for debugging.
*
* @return the stringified form of this object
*/
@Override
public String toString() {
StringBuilder buf = new StringBuilder().append("[ option: ");
buf.append(name);
if (longName != null) {
buf.append(" ").append(longName);
}
buf.append(" ");
if (hasValues()) {
buf.append("[ARG...]");
} else if (hasValue()) {
buf.append(" [ARG]");
}
buf.append(" :: ").append(description);
if (valueType != null) {
buf.append(" :: ").append(valueType);
}
buf.append(" ]");
return buf.toString();
}
/**
* 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();
}
/**
* Tells if the option can accept more arguments.
*
* @return false if the maximum number of arguments is reached
*/
boolean acceptsValue() {
return (hasValue() && (numberOfValues <= 0 || values.size() < numberOfValues));
}
/**
* Tells if the option requires more arguments to be valid.
*
* @return false if the option doesn't require more arguments
*/
boolean requiresValue() {
if (optionalValue) {
return false;
}
if (numberOfValues == UNLIMITED_VALUES) {
return values.isEmpty();
}
return acceptsValue();
}
/**
* Returns a {@link Builder} to create an {@link Option} using descriptive
* methods.
*
* @return a new {@link Builder} instance
*/
public static Builder builder() {
return builder(null);
}
/**
* Returns a {@link Builder} to create an {@link Option} using descriptive
* methods.
*
* @param name short representation of the option
* @return a new {@link Builder} instance
* @throws IllegalArgumentException if there are any non valid Option characters in {@code name}
*/
public static Builder builder(String name) {
return new Builder(name);
}
/**
* A nested builder class to create Option instances
* using descriptive methods.
*
* Example usage:
*
* Option option = Option.builder("a")
* .required(true)
* .longName("arg-name")
* .build();
*
*/
public static final class Builder {
/** The name of the option */
private final String name;
/** The long representation of the option */
private String longName;
/** Description of the option */
private String description;
/** The name of the argument value for this option */
private String valueName;
private boolean withEqualSign;
/** Specifies whether this option is required to be present */
private boolean required;
/** Specifies whether the argument value of this Option is optional */
private boolean optionalValue;
/** The number of argument values this option can have */
private int numberOfValues = UNINITIALIZED;
/** The type of this Option */
private OptionValueType valueType = OptionValueType.STRING;
/**
* Constructs a new {@code Builder} with the minimum
* required parameters for an {@code Option} instance.
*
* @param name short representation of the option
* @throws IllegalArgumentException if there are any non valid Option characters in {@code name}
*/
private Builder(String name) throws IllegalArgumentException {
OptionUtils.validateOption(name);
this.name = name;
}
/**
* Sets the long name of the Option.
*
* @param longName the long name of the Option
* @return this builder, to allow method chaining
*/
public Builder longName(String longName) {
this.longName = longName;
return this;
}
/**
* Sets the display name for the argument value.
*
* @param valueName the display name for the argument value
* @return this builder, to allow method chaining
*/
public Builder valueName(String valueName) {
this.valueName = valueName;
return this;
}
/**
* Sets the type of the Option.
*
* @param valueType the type of the Option
* @return this builder, to allow method chaining
*/
public Builder valueType(OptionValueType valueType) {
this.valueType = valueType;
return this;
}
/**
* The Option will use '=' as a means to separate argument value.
*
* @return this builder, to allow method chaining
*/
public Builder withEqualSign() {
this.withEqualSign = true;
return hasValue();
}
/**
* Indicates that the Option will require an argument.
*
* @return this builder, to allow method chaining
*/
public Builder hasValue() {
return hasValue(true);
}
/**
* Indicates if the Option has an argument value or not.
*
* @param hasValue specifies whether the Option takes an argument value or not
* @return this builder, to allow method chaining
*/
public Builder hasValue(boolean hasValue) {
// set to UNINITIALIZED when no arg is specified to be compatible with OptionBuilder
numberOfValues = (hasValue ? 1 : UNINITIALIZED);
return this;
}
/**
* Indicates that the Option can have unlimited argument values.
*
* @return this builder, to allow method chaining
*/
public Builder hasValues() {
numberOfValues = UNLIMITED_VALUES;
return this;
}
/**
* Sets the number of argument values the Option can take.
*
* @param numberOfValues the number of argument values
* @return this builder, to allow method chaining
*/
public Builder numberOfValues(int numberOfValues) {
this.numberOfValues = numberOfValues;
return this;
}
/**
* Sets whether the Option can have an optional argument value.
*
* @return this builder, to allow method chaining
*/
public Builder optionalValue() {
this.optionalValue = true;
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(boolean required) {
this.required = required;
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(String description) {
this.description = description;
return this;
}
/**
* Constructs an Option with the values declared by this {@link Builder}.
*
* @return the new {@link Option}
* @throws IllegalArgumentException if neither {@code name} or {@code longName} has been set
*/
public Option build() {
if (name == null && longName == null) {
throw new IllegalArgumentException("Either name or longName must be specified");
}
return new Option(this);
}
}
}