/*
 * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package org.graalvm.visualvm.jfr.utils;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.time.Instant;
import java.util.Date;

/**
 *
 * @author Jiri Sedlacek
 */
public final class InstantFormatter {
    
    private static final DateFormat TIME_FORMAT;
    
    static {
        TIME_FORMAT = SimpleDateFormat.getDateTimeInstance(DateFormat.SHORT, DateFormat.MEDIUM);
    }
    
    
    private InstantFormatter() {}
    
    
    public static String format(Instant i) {
        return format(i, new StringBuffer()).toString();
    }
    
    public static StringBuffer format(Instant i, StringBuffer b) {
        try {
            return b.append(TIME_FORMAT.format(new Date(ValuesConverter.instantToMillis(i)))); // milliseconds precision!
        } catch (ArithmeticException e) {
            return b.append(i.toString()); // TODO: handle differently!
        }
    }
    
}
