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/* Copyright (c) 2010 Daniel Doubrovkine, All Rights Reserved
 *
 * The contents of this file is dual-licensed under 2
 * alternative Open Source/Free licenses: LGPL 2.1 or later and
 * Apache License 2.0. (starting with JNA version 4.0.0).
 *
 * You can freely decide which license you want to apply to
 * the project.
 *
 * You may obtain a copy of the LGPL License at:
 *
 * http://www.gnu.org/licenses/licenses.html
 *
 * A copy is also included in the downloadable source code package
 * containing JNA, in file "LGPL2.1".
 *
 * You may obtain a copy of the Apache License at:
 *
 * http://www.apache.org/licenses/
 *
 * A copy is also included in the downloadable source code package
 * containing JNA, in file "AL2.0".
 */
package com.sun.jna.platform.win32;

import com.sun.jna.Native;
import com.sun.jna.platform.win32.Guid.GUID;
import com.sun.jna.platform.win32.WinNT.HRESULT;

/**
 * Ole32 Utility API.
 * @author dblock[at]dblock.org
 */
public abstract class Ole32Util {

    /**
     * Convert a string to a GUID.
     *
     * @param guidString String representation of a GUID, including { }.
     *
     * @return A GUID.
     */
    public static GUID getGUIDFromString(String guidString) {
        GUID lpiid = new GUID();
        HRESULT hr = Ole32.INSTANCE.IIDFromString(guidString, lpiid);
        if (!hr.equals(W32Errors.S_OK)) {
            throw new RuntimeException(hr.toString());
        }
        return lpiid;
    }

    /**
     * Convert a GUID into a string.
     *
     * @param guid GUID.
     *
     * @return String representation of a GUID.
     */
    public static String getStringFromGUID(GUID guid) {
        GUID pguid = new GUID(guid.getPointer());
        int max = 39;
        char[] lpsz = new char[max];
        int len = Ole32.INSTANCE.StringFromGUID2(pguid, lpsz, max);
        if (len == 0) {
            throw new RuntimeException("StringFromGUID2");
        }
        lpsz[len - 1] = 0;
        return Native.toString(lpsz);
    }

    /**
     * Generate a new GUID.
     *
     * @return New GUID.
     */
    public static GUID generateGUID() {
        GUID pguid = new GUID();
        HRESULT hr = Ole32.INSTANCE.CoCreateGuid(pguid);
        if (!hr.equals(W32Errors.S_OK)) {
            throw new RuntimeException(hr.toString());
        }
        return pguid;
    }
}