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GraphHopper is a fast and memory efficient Java road routing engine working seamlessly with OpenStreetMap data.

There is a newer version: 0.7.0

/*
 *  Licensed to GraphHopper and Peter Karich under one or more contributor
 *  license agreements. See the NOTICE file distributed with this work for 
 *  additional information regarding copyright ownership.
 * 
 *  GraphHopper licenses this file to you under the Apache License, 
 *  Version 2.0 (the "License"); you may not use this file except in 
 *  compliance with the License. You may obtain a copy of the License at
 * 
 *       http://www.apache.org/licenses/LICENSE-2.0
 * 
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package com.graphhopper.util;

import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;

/**
 * Put the usage of proprietary "sun" classes and after jdk6 classes into this class. To use Helper
 * class under Android as well.
 * 
 * @author Peter Karich
 */
public class Helper7
{

    /**
     * true, if this platform supports unmapping mmapped files.
     */
    public static final boolean UNMAP_SUPPORTED;

    static
    {
        boolean v;
        try
        {
            Class.forName("sun.misc.Cleaner");
            Class.forName("java.nio.DirectByteBuffer")
                    .getMethod("cleaner");
            v = true;
        } catch (Exception e)
        {
            v = false;
        }
        UNMAP_SUPPORTED = v;
    }

    public static String getBeanMemInfo()
    {
        java.lang.management.OperatingSystemMXBean mxbean = java.lang.management.ManagementFactory.getOperatingSystemMXBean();
        com.sun.management.OperatingSystemMXBean sunmxbean = (com.sun.management.OperatingSystemMXBean) mxbean;
        long freeMemory = sunmxbean.getFreePhysicalMemorySize();
        long availableMemory = sunmxbean.getTotalPhysicalMemorySize();
        return "free:" + freeMemory / Helper.MB + ", available:" + availableMemory / Helper.MB
                + ", rfree:" + Runtime.getRuntime().freeMemory() / Helper.MB;
    }

    public static void close( XMLStreamReader r )
    {
        try
        {
            if (r != null)
            {
                r.close();
            }
        } catch (XMLStreamException ex)
        {
            throw new RuntimeException("Couldn't close xml reader", ex);
        }
    }
}