/******************************************************************************* * Copyright (c) 2000, 2003 IBM Corporation and others. * All rights reserved. This program and the accompanying materials  * are made available under the terms of the Common Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/cpl-v10.html *  * Contributors: *     IBM Corporation - initial API and implementation *******************************************************************************/package org.eclipse.swt.dnd;import org.eclipse.swt.internal.ole.win32.*;/** * The class <code>RTFTransfer</code> provides a platform specific mechanism  * for converting text in RTF format represented as a java <code>String</code>  * to a platform specific representation of the data and vice versa.  See  * <code>Transfer</code> for additional information. *  * <p>An example of a java <code>String</code> containing RTF text is shown  * below:</p> *  * <code><pre> *     String rtfData = "{\\rtf1{\\colortbl;\\red255\\green0\\blue0;}\\uc1\\b\\i Hello World}"; * </code></pre> */public class RTFTransfer extends ByteArrayTransfer {	private static RTFTransfer _instance = new RTFTransfer();	private static final String CF_RTF = "Rich Text Format"; //$NON-NLS-1$	private static final int CF_RTFID = registerType(CF_RTF);	private static int CodePage = COM.GetACP();private RTFTransfer() {}/** * Returns the singleton instance of the RTFTransfer class. * * @return the singleton instance of the RTFTransfer class */public static RTFTransfer getInstance () {	return _instance;}/** * This implementation of <code>javaToNative</code> converts RTF-formatted text * represented by a java <code>String</code> to a platform specific representation. * For additional information see <code>Transfer#javaToNative</code>. *  * @param object a java <code>String</code> containing RTF text * @param transferData an empty <code>TransferData</code> object; this *  object will be filled in on return with the platform specific format of the data */public void javaToNative (Object object, TransferData transferData){	transferData.result = COM.E_FAIL;	if (object == null || !(object instanceof String)) return;	if (!isSupportedType(transferData)) {		// did not match the TYMED		transferData.stgmedium = new STGMEDIUM();		transferData.result = COM.DV_E_TYMED;		return;	}	// CF_RTF is stored as a null terminated byte array	String string = (String)object;	int count = string.length();	if (count == 0) return;	char[] chars = new char[count + 1];	string.getChars(0, count, chars, 0);	int cchMultiByte = COM.WideCharToMultiByte(CodePage, 0, chars, -1, null, 0, null, null);	if (cchMultiByte == 0) {		transferData.stgmedium = new STGMEDIUM();		transferData.result = COM.DV_E_STGMEDIUM;		return;	}	int lpMultiByteStr = COM.GlobalAlloc(COM.GMEM_FIXED | COM.GMEM_ZEROINIT, cchMultiByte);	COM.WideCharToMultiByte(CodePage, 0, chars, -1, lpMultiByteStr, cchMultiByte, null, null);	transferData.stgmedium = new STGMEDIUM();	transferData.stgmedium.tymed = COM.TYMED_HGLOBAL;	transferData.stgmedium.unionField = lpMultiByteStr;	transferData.stgmedium.pUnkForRelease = 0;	transferData.result = COM.S_OK;	return;}/** * This implementation of <code>nativeToJava</code> converts a platform specific  * representation of RTF text to a java <code>String</code>. * For additional information see <code>Transfer#nativeToJava</code>. *  * @param transferData the platform specific representation of the data to be  * been converted * @return a java <code>String</code> containing RTF text if the  * conversion was successful; otherwise null */public Object nativeToJava(TransferData transferData){	if (!isSupportedType(transferData) || transferData.pIDataObject == 0) return null;	IDataObject data = new IDataObject(transferData.pIDataObject);	data.AddRef();	STGMEDIUM stgmedium = new STGMEDIUM();	FORMATETC formatetc = transferData.formatetc;	stgmedium.tymed = COM.TYMED_HGLOBAL;		transferData.result = data.GetData(formatetc, stgmedium);	data.Release();		if (transferData.result != COM.S_OK) return null;	int hMem = stgmedium.unionField;	try {		int lpMultiByteStr = COM.GlobalLock(hMem);		if (lpMultiByteStr == 0) return null;		try {			int cchWideChar  = COM.MultiByteToWideChar (CodePage, COM.MB_PRECOMPOSED, lpMultiByteStr, -1, null, 0);			if (cchWideChar == 0) return null;			char[] lpWideCharStr = new char [cchWideChar - 1];			COM.MultiByteToWideChar (CodePage, COM.MB_PRECOMPOSED, lpMultiByteStr, -1, lpWideCharStr, lpWideCharStr.length);			return new String(lpWideCharStr);		} finally {			COM.GlobalUnlock(hMem);		}	} finally {		COM.GlobalFree(hMem);	}}protected int[] getTypeIds(){	return new int[] {CF_RTFID};}protected String[] getTypeNames(){	return new String[] {CF_RTF}; }}