Timing.java

/*
 * Copyright (c) 2008, 2015, 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.
 *
 * 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 com.sun.hotspot.igv.hierarchicallayout;

/**
 *
 * @author Thomas Wuerthinger
 */
public class Timing {

    private long lastValue;
    private long sum;
    private String name;

    public Timing(String name) {
        this.name = name;
    }

    @Override
    public String toString() {
        long val = sum;
        if (lastValue != 0) {
            // Timer running
            long newValue = System.nanoTime();
            val += (newValue - lastValue);
        }
        return "Timing for " + name + " is: " + val / 1000000 + " ms";
    }

    public void print() {
        System.out.println(toString());
    }

    public void start() {
        lastValue = System.nanoTime();
    }

    public void stop() {
        if (lastValue == 0) {
            throw new IllegalStateException("You must call start before stop");
        }
        long newValue = System.nanoTime();
        sum += newValue - lastValue;
        lastValue = 0;
    }
}