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WAFFLE JNA implementation

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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.Secur32;
import com.sun.jna.platform.win32.Win32Exception;
import com.sun.jna.platform.win32.Sspi.CtxtHandle;
import com.sun.jna.platform.win32.WinError;

import waffle.windows.auth.IWindowsImpersonationContext;

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

    /** The ctx. */
    private CtxtHandle ctx;

    /**
     * Instantiates a new windows security context impersonation context impl.
     *
     * @param newCtx
     *            the new ctx
     */
    public WindowsSecurityContextImpersonationContextImpl(final CtxtHandle newCtx) {
        final int rc = Secur32.INSTANCE.ImpersonateSecurityContext(newCtx);
        if (rc != WinError.SEC_E_OK) {
            throw new Win32Exception(rc);
        }

        this.ctx = newCtx;
    }

    /* (non-Javadoc)
     * @see waffle.windows.auth.IWindowsImpersonationContext#revertToSelf()
     */
    @Override
    public void revertToSelf() {
        final int rc = Secur32.INSTANCE.RevertSecurityContext(this.ctx);
        if (rc != WinError.SEC_E_OK) {
            throw new Win32Exception(rc);
        }
    }
}