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/**
 * Waffle (https://github.com/dblock/waffle)
 *
 * Copyright (c) 2010 - 2015 Application Security, Inc.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Application Security, Inc.
 */
package waffle.windows.auth.impl;

import com.sun.jna.platform.win32.Advapi32;
import com.sun.jna.platform.win32.Kernel32;
import com.sun.jna.platform.win32.Win32Exception;
import com.sun.jna.platform.win32.WinNT.HANDLE;

import waffle.windows.auth.IWindowsImpersonationContext;

/**
 * The Class WindowsIdentityImpersonationContextImpl.
 *
 * @author dblock[at]dblock[dot]org
 */
public class WindowsIdentityImpersonationContextImpl implements IWindowsImpersonationContext {

    /**
     * Impersonate a logged on user.
     * 
     * @param windowsIdentity
     *            Windows identity obtained via LogonUser.
     */
    public WindowsIdentityImpersonationContextImpl(final HANDLE windowsIdentity) {
        if (!Advapi32.INSTANCE.ImpersonateLoggedOnUser(windowsIdentity)) {
            throw new Win32Exception(Kernel32.INSTANCE.GetLastError());
        }
    }

    /* (non-Javadoc)
     * @see waffle.windows.auth.IWindowsImpersonationContext#revertToSelf()
     */
    @Override
    public void revertToSelf() {
        Advapi32.INSTANCE.RevertToSelf();
    }
}




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