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//@(#) $Id: AutomationHandler.java 1156 2004-03-11 10:06:26Z S1462 $
package org.eclipse.swt.ole.win32;

import org.eclipse.swt.internal.ole.win32.COM;
import org.eclipse.swt.internal.ole.win32.GUID;
import org.eclipse.swt.internal.ole.win32.IDispatch;
import org.eclipse.swt.internal.ole.win32.IUnknown;


/**
 * AutomationHandler provides a mechanism for accessing functionality that is
 * specific to a COM Object .
 *
 * The COM Object must support the IDispatch interface in order to provide
 * OleAutomation support.
 *
 * 
Here is a sample IDL fragment:
 *
 * 
 *  interface IBerechtigungInteractive : IDispatch
 *	{
 *    [id(DISPID_VALUE), propget, helpstring("property UserName")]
 *       HRESULT UserName([out, retval] BSTR *pVal);
 *
 *    [id(1), helpstring("method Create")]
 *       HRESULT Create([in] BSTR Profile, [in, defaultvalue(0)] long Wnd, [in, defaultvalue(0)] int Flags);
 *    .....
 *	};
 * 
 *
 *  An example of how to interact with AutomationHandler is shown below:
 *
 * 
 *
 *  AutomationHandler alfaBer = new AutomationHandler("SD_BER.BerechtigungInteractive");
 *
 * // Look up the ID of the UserName property
 *   int[] rgdispid = alfaBer.getAutomationObject().getIDsOfNames(new String[]{"UserName"});
 *   int dispIdMember = rgdispid[0];
 *  // Get the  value of the UserName parameter:
 *   Variant pVarResult = alfaBer.getAutomationObject().getProperty(dispIdMember);
 *
 *  if (pVarResult != null && pVarResult.getType() == OLE.VT_BSTR) {
 *    System.out.println("UserName is " + pVarResult.getString());
 *	}
 *
 *  // Invoke the Create method
 *  // Look up the IDs of the Create method and its parameter
 *   int[] rgdispid = alfaBer.getAutomationObject().getIDsOfNames(new String[]{"Create", "Profile"});
 *   int dispIdMember = rgdispid[0];
 *
 *   // Convert arguments to Variant objects
 *       Variant[] rgvarg = new Variant[1];
 *       rgvarg[0] = new Variant("KRE");
 *       int[] rgdispidNamedArgs = new int[1];
 *       rgdispidNamedArgs[0] = rgdispid[1]; // identifier of argument
 * // Call the method
 *      Variant pVarResult = alfaBer.getAutomationObject().invoke(dispIdMember, rgvarg, rgdispidNamedArgs);
 *
 *	// Check the return value
 *  if (pVarResult == null ){
 *    System.out.println("Failed to call method ");
 *	}
 * // Dispose the automation object
 *  alfaBer.dispose();
 *
 * 
 *
 *
 */
public class AutomationHandler {
      //the OleAutomation object for this  handler
      private OleAutomation  oleAutomation;

      // Server relevant context
      private final int CLSCTX_SERVER= (COM.CLSCTX_INPROC_SERVER |
                                        COM.CLSCTX_LOCAL_SERVER  |
                                        COM.CLSCTX_REMOTE_SERVER
                                        );

      /**
      * Creates an OleAutomation object with a given ProgID.
      *
      * @param progID the  Prog-ID  for the COM Object whose functionality
      *        you need to access
      *
      * @exception SWTError 
      *    ERROR_CANNOT_CREATE_OBJECT
      *  
      */
      public AutomationHandler(String progID){
        GUID appClsid = getClassID(progID);

        int[] ppv = new int[1];
        int result = COM.CoCreateInstance(appClsid, 0, CLSCTX_SERVER , COM.IIDIUnknown, ppv);
        if (result != COM.S_OK){
              OLE.error(OLE.ERROR_CANNOT_CREATE_OBJECT, result);
        }

        IUnknown  objIUnknown = new IUnknown(ppv[0]);
        int[] ppvObject = new int[1];
        result = objIUnknown.QueryInterface(COM.IIDIDispatch, ppvObject);
        objIUnknown.Release(); // no more needed

        if (result != COM.S_OK){
           OLE.error(OLE.ERROR_INTERFACE_NOT_FOUND, result);
       }
       IDispatch  objIDispatch = new IDispatch(ppvObject[0]);
       oleAutomation = new OleAutomation(objIDispatch);
       objIDispatch.Release(); // no more needed
    }

    /**
     * @param objIDispatch
     */
    public AutomationHandler(IDispatch objIDispatch){
        oleAutomation = new OleAutomation(objIDispatch);
    }


      /**
      * retrieves the CLSID of a COM object with a given ProgID.
      *
      * @param clientName the  Prog-ID  for the COM Object
      *
      * @exception SWTError 
      *    ERROR_INVALID_CLASSID
      *  
      */
       private GUID getClassID(String clientName) {
         // create a GUID struct to hold the result
         GUID guid = new GUID();

         // create a null terminated array of char
         char[] buffer = null;
         if (clientName != null) {
           int count = clientName.length();
           buffer = new char[count + 1];
           clientName.getChars(0, count, buffer, 0);
         }
         if (COM.CLSIDFromProgID(buffer, guid) != COM.S_OK){
           int result = COM.CLSIDFromString(buffer, guid);
           if (result != COM.S_OK)
             OLE.error(OLE.ERROR_INVALID_CLASSID, result);
         }
         return guid;
       }

    /**
     * Disposes the Automation object.
     * This method releases the IDispatch interface on the Automation object.
     */
    public void dispose() {
      if (oleAutomation != null) oleAutomation.dispose();
      oleAutomation = null;
    }

    /**
     * returns the Automation object.
     */
     public OleAutomation getAutomationObject(){
        return oleAutomation;
    }

    /**
     * returns the adress of Automation object.
     */
    public int getAddress(){
        return oleAutomation.getAddress();
    }

}