org.unix4j.unix.uniq.UniqOption Maven / Gradle / Ivy
package org.unix4j.unix.uniq;
import java.util.Collections;
import java.util.EnumSet;
import java.util.Iterator;
import org.unix4j.option.Option;
import org.unix4j.unix.Uniq;
/**
* Options for the {@link Uniq uniq} command.
*
* For most applications, it may be more convenient to use {@link Uniq#Options}
* instead of the option constants defined here.
*
*
* {@code -c} {@code --count} Precedes each output line with a count of the number of times the
line occurred in the input. {@code -d} {@code --duplicatedOnly} Suppresses the writing of lines that are not repeated in the input. {@code -u} {@code --uniqueOnly} Suppresses the writing of lines that are repeated in the input. {@code -g} {@code --global} Suppresses repeated lines globally, that is, if lines are
non-adjacent. This option guarantees unique output lines even if the
input lines are not sorted.
*/
public enum UniqOption implements Option, UniqOptions {
/**
* Option {@code --count}, {@code -c}:
* Precedes each output line with a count of the number of times the
line occurred in the input.
*/
count('c'),
/**
* Option {@code --duplicatedOnly}, {@code -d}:
* Suppresses the writing of lines that are not repeated in the input.
*/
duplicatedOnly('d'),
/**
* Option {@code --uniqueOnly}, {@code -u}:
* Suppresses the writing of lines that are repeated in the input.
*/
uniqueOnly('u'),
/**
* Option {@code --global}, {@code -g}:
* Suppresses repeated lines globally, that is, if lines are
non-adjacent. This option guarantees unique output lines even if the
input lines are not sorted.
*/
global('g');
private final char acronym;
private UniqOption(char acronym) {
this.acronym = acronym;
}
@Override
public Class optionType() {
return UniqOption.class;
}
/**
* Returns the option with the given {@code acronym}, or {@code null} if no
* such option is found.
*
* @param acronym the option {@link #acronym() acronym}
* @return the option with the given {@code acronym} or {@code null} if it
* is not found
*/
public static UniqOption findByAcronym(char acronym) {
for (final UniqOption opt : values()) {
if (opt.acronym() == acronym) return opt;
}
return null;
}
@Override
public char acronym() {
return acronym;
}
@Override
public boolean isSet(UniqOption option) {
return equals(option);
}
/**
* Returns a new set with {@code this} active option.
*
* @return a new set containing this option
*/
@Override
public EnumSet asSet() {
return EnumSet.of(this);
}
/**
* Returns an immutable iterator returning o single element: {@code this}
* option.
*
* @return an immutable iterator with {@code this} active option.
*/
@Override
public Iterator iterator() {
return Collections.singleton(this).iterator();
}
/**
* Returns 1 as this is a set with a single element: {@code this} option
*
* @return one
*/
@Override
public int size() {
return 1;
}
/**
* Returns true if the {@link Option#acronym() acronym} should be used for
* the specified {@code option} in string representations.
*
* This method returns always true for all options.
*
* @param option
* the option of interest
* @return always true indicating that option acronyms should be used in
* string representations for all options
*/
@Override
public boolean useAcronymFor(UniqOption option) {
return true;
}
}