package com.ximple.io.dgn7;
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/*
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* GeoTools - OpenSource mapping toolkit
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* http://geotools.org
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* (C) 2003-2006, Geotools Project Managment Committee (PMC)
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*/
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// J2SE dependencies
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import java.lang.reflect.Method;
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import java.nio.ByteBuffer;
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import java.security.AccessController;
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import java.security.PrivilegedAction;
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import java.util.logging.Level;
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import java.util.logging.Logger;
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/**
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* Utility class for managing memory mapped buffers.
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*
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* @author Andres Aimes
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* @version $Id$
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* @source $URL$
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* @since 2.0
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*/
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public class NIOUtilities
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{
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/**
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* {@code true} if a warning has already been logged.
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*/
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private static boolean warned = false;
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/**
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* Do not allows instantiation of this class.
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*
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* @todo This constructor will become private when {@code NIOBufferUtils}
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* will have been removed.
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*/
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protected NIOUtilities()
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{
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}
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/**
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* Really closes a {@code MappedByteBuffer} without the need to wait for garbage
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* collection. Any problems with closing a buffer on Windows (the problem child in this
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* case) will be logged as {@code SEVERE} to the logger of the package name. To
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* force logging of errors, set the System property "org.geotools.io.debugBuffer" to "true".
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*
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* @param buffer The buffer to close.
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* @return true if the operation was successful, false otherwise.
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* @see java.nio.MappedByteBuffer
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*/
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public static boolean clean(final ByteBuffer buffer)
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{
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if (buffer == null || !buffer.isDirect())
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{
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return false;
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}
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Boolean b = (Boolean) AccessController.doPrivileged(new PrivilegedAction()
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{
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public Object run()
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{
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Boolean success = Boolean.FALSE;
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try
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{
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Method getCleanerMethod = buffer.getClass().getMethod("cleaner", (Class[]) null);
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getCleanerMethod.setAccessible(true);
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Object cleaner = getCleanerMethod.invoke(buffer, (Object[]) null);
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Method clean = cleaner.getClass().getMethod("clean", (Class[]) null);
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clean.invoke(cleaner, (Object[]) null);
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success = Boolean.TRUE;
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} catch (Exception e)
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{
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// This really is a show stopper on windows
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if (isLoggable())
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{
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log(e, buffer);
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}
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}
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return success;
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}
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});
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return b.booleanValue();
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}
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/**
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* Check if a warning message should be logged.
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*/
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private static synchronized boolean isLoggable()
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{
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try
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{
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return !warned && (
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System.getProperty("org.geotools.io.debugBuffer", "false").equalsIgnoreCase("true") ||
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System.getProperty("os.name").indexOf("Windows") >= 0);
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} catch (SecurityException exception)
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{
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// The utilities may be running in an Applet, in which case we
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// can't read properties. Assumes we are not in debugging mode.
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return false;
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}
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}
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/**
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* Log a warning message.
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*/
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private static synchronized void log(final Exception e, final ByteBuffer buffer)
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{
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warned = true;
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String message = "Error attempting to close a mapped byte buffer : " + buffer.getClass().getName()
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+ "\n JVM : " + System.getProperty("java.version")
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+ ' ' + System.getProperty("java.vendor");
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Logger.getLogger("org.geotools.io").log(Level.SEVERE, message, e);
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}
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}
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