package it.unimi.dsi.fastutil.chars;
import java.util.Comparator;
public final class CharComparators {
private CharComparators() {
}
protected static class NaturalImplicitComparator implements CharComparator, java.io.Serializable {
private static final long serialVersionUID = 1L;
@Override
public final int compare(final char a, final char b) {
return (Character.compare((a), (b)));
}
@Override
public CharComparator reversed() {
return OPPOSITE_COMPARATOR;
}
private Object readResolve() {
return NATURAL_COMPARATOR;
}
};
public static final CharComparator NATURAL_COMPARATOR = new NaturalImplicitComparator();
protected static class OppositeImplicitComparator implements CharComparator, java.io.Serializable {
private static final long serialVersionUID = 1L;
@Override
public final int compare(final char a, final char b) {
return -(Character.compare((a), (b)));
}
@Override
public CharComparator reversed() {
return NATURAL_COMPARATOR;
}
private Object readResolve() {
return OPPOSITE_COMPARATOR;
}
};
public static final CharComparator OPPOSITE_COMPARATOR = new OppositeImplicitComparator();
protected static class OppositeComparator implements CharComparator, java.io.Serializable {
private static final long serialVersionUID = 1L;
final CharComparator comparator;
protected OppositeComparator(final CharComparator c) {
comparator = c;
}
@Override
public final int compare(final char a, final char b) {
return comparator.compare(b, a);
}
@Override
public final CharComparator reversed() {
return comparator;
}
};
public static CharComparator oppositeComparator(final CharComparator c) {
if (c instanceof OppositeComparator)
return ((OppositeComparator) c).comparator;
return new OppositeComparator(c);
}
public static CharComparator asCharComparator(final Comparator<? super Character> c) {
if (c == null || c instanceof CharComparator)
return (CharComparator) c;
return new CharComparator() {
@Override
public int compare(char x, char y) {
return c.compare(Character.valueOf(x), Character.valueOf(y));
}
@SuppressWarnings("deprecation")
@Override
public int compare(Character x, Character y) {
return c.compare(x, y);
}
};
}
}