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 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
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package org.glassfish.admin.amx.util.jmx;

import java.io.Serializable;
import javax.management.MBeanOperationInfo;
import org.glassfish.admin.amx.util.jmx.stringifier.MBeanFeatureInfoStringifierOptions;
import org.glassfish.admin.amx.util.jmx.stringifier.MBeanOperationInfoStringifier;

/**
Caution: this Comparator may be inconsistent with equals() because it ignores the description.
 */
public final class MBeanOperationInfoComparator
        implements java.util.Comparator, Serializable
{
    private static final MBeanOperationInfoStringifier OPERATION_INFO_STRINGIFIER =
            new MBeanOperationInfoStringifier(new MBeanFeatureInfoStringifierOptions(false, ","));

    public static final MBeanOperationInfoComparator INSTANCE = new MBeanOperationInfoComparator();

    private MBeanOperationInfoComparator()
    {
    }

    @Override
    public int compare(final MBeanOperationInfo info1, final MBeanOperationInfo info2)
    {
        // we just want to sort based on name and signature; there can't be two operations with the
        // same name and same signature, so as long as we include the name and signature the
        // sorting will always be consistent.
        int c = info1.getName().compareTo(info2.getName());
        if (c == 0)
        {
            // names the same, subsort on signature, first by number of params
            c = info1.getSignature().length - info2.getSignature().length;
            if (c == 0)
            {
                // names the same, subsort on signature, first by number of params
                c = MBeanOperationInfoStringifier.getSignature(info1).compareTo(
                        MBeanOperationInfoStringifier.getSignature(info2));
            }

        }

        return (c);
    }

    @Override
    public boolean equals(Object other)
    {
        return (other instanceof MBeanOperationInfoComparator);
    }

    @Override
    public int hashCode() {
        int hash = 3;
        return hash;
    }

}