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