Application: gvSIG desktop

package org.gvsig.expressionevaluator.swing.impl;

import java.util.Comparator;

import java.util.Objects;

import org.gvsig.expressionevaluator.ExpressionUtils;

/**

 *

 * @author jjdelcerro

 */

public class Utils {

    public static Comparator naturalComparator() {

        return new Comparator() {

            @Override

            public int compare(Object o1, Object o2) {

                if (o1 instanceof Integer && o2 instanceof Number ) {

                    return Long.compare((Integer) o1, ((Number)o2).intValue());

                } else if (o1 instanceof Long && o2 instanceof Number ) {

                    return Long.compare((Long) o1, ((Number)o2).longValue());

                } else if (o1 instanceof Double && o2 instanceof Number ) {

                    return Double.compare((Double) o1, ((Number)o2).doubleValue());

                } else if (o1 instanceof Float && o2 instanceof Number) {

                    return Double.compare((Float) o1, ((Number)o2).floatValue());

                } else if (o1 instanceof Number && o2 instanceof Number) {

                    return Double.compare( getDouble((Number) o1), getDouble((Number) o2));

                } else if (o1 instanceof String && o2 instanceof String) {

                    return ((String) o1).compareToIgnoreCase((String)o2);

                } else {

                    try {

                        return ((Comparable) o1).compareTo((Comparable)o2);

                    } catch(Exception ex) {

                        return Objects.toString(o1, "").compareTo(Objects.toString(o2, ""));

                    }

                }

            }

        };

    }

    private static double getDouble(Number n) {

        if( n==null ) {

            return 0;

        }

        return n.doubleValue();

    }

    public static String repr(Object value)  {

        return ExpressionUtils.repr(value);

    }

}