| /******************************************************************************* |
| * Copyright (c) 2000, 20007 IBM Corporation and others. |
| * 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: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.swt.dnd; |
| |
| import org.eclipse.swt.internal.ole.win32.*; |
| import org.eclipse.swt.internal.win32.*; |
| |
| /** |
| * The class <code>URLTransfer</code> provides a platform specific mechanism |
| * for converting text in URL format represented as a java <code>String</code> |
| * to a platform specific representation of the data and vice versa. The string |
| * must contain a fully specified url. |
| * |
| * <p>An example of a java <code>String</code> containing a URL is shown below:</p> |
| * |
| * <code><pre> |
| * String url = "http://www.eclipse.org"; |
| * </code></pre> |
| * |
| * @see Transfer |
| * @since 3.4 |
| */ |
| public class URLTransfer extends ByteArrayTransfer { |
| |
| static URLTransfer _instance = new URLTransfer(); |
| static final String CFSTR_INETURLW = "UniformResourceLocatorW"; //$NON-NLS-1$ |
| static final int CFSTR_INETURLIDW = registerType(CFSTR_INETURLW); |
| static final String CFSTR_INETURL = "UniformResourceLocator"; //$NON-NLS-1$ |
| static final int CFSTR_INETURLID = registerType(CFSTR_INETURL); |
| |
| private URLTransfer() {} |
| |
| /** |
| * Returns the singleton instance of the URLTransfer class. |
| * |
| * @return the singleton instance of the URLTransfer class |
| */ |
| public static URLTransfer getInstance () { |
| return _instance; |
| } |
| |
| /** |
| * This implementation of <code>javaToNative</code> converts a URL |
| * represented by a java <code>String</code> to a platform specific representation. |
| * |
| * @param object a java <code>String</code> containing a URL |
| * @param transferData an empty <code>TransferData</code> object that will |
| * be filled in on return with the platform specific format of the data |
| * |
| * @see Transfer#nativeToJava |
| */ |
| @Override |
| public void javaToNative (Object object, TransferData transferData){ |
| if (!checkURL(object) || !isSupportedType(transferData)) { |
| DND.error(DND.ERROR_INVALID_DATA); |
| } |
| transferData.result = COM.E_FAIL; |
| // URL is stored as a null terminated byte array |
| String url = ((String)object); |
| if (transferData.type == CFSTR_INETURLIDW) { |
| int charCount = url.length (); |
| char[] chars = new char[charCount+1]; |
| url.getChars (0, charCount, chars, 0); |
| int byteCount = chars.length * 2; |
| long /*int*/ newPtr = OS.GlobalAlloc(COM.GMEM_FIXED | COM.GMEM_ZEROINIT, byteCount); |
| OS.MoveMemory(newPtr, chars, byteCount); |
| transferData.stgmedium = new STGMEDIUM(); |
| transferData.stgmedium.tymed = COM.TYMED_HGLOBAL; |
| transferData.stgmedium.unionField = newPtr; |
| transferData.stgmedium.pUnkForRelease = 0; |
| transferData.result = COM.S_OK; |
| } else if (transferData.type == CFSTR_INETURLID) { |
| int count = url.length(); |
| char[] chars = new char[count + 1]; |
| url.getChars(0, count, chars, 0); |
| int codePage = OS.GetACP(); |
| int cchMultiByte = OS.WideCharToMultiByte(codePage, 0, chars, -1, null, 0, null, null); |
| if (cchMultiByte == 0) { |
| transferData.stgmedium = new STGMEDIUM(); |
| transferData.result = COM.DV_E_STGMEDIUM; |
| return; |
| } |
| long /*int*/ lpMultiByteStr = OS.GlobalAlloc(OS.GMEM_FIXED | OS.GMEM_ZEROINIT, cchMultiByte); |
| OS.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; |
| } |
| } |
| |
| /** |
| * This implementation of <code>nativeToJava</code> converts a platform |
| * specific representation of a URL to a java <code>String</code>. |
| * |
| * @param transferData the platform specific representation of the data to be converted |
| * @return a java <code>String</code> containing a URL if the conversion was successful; |
| * otherwise null |
| * |
| * @see Transfer#javaToNative |
| */ |
| @Override |
| 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 = getData(data, formatetc, stgmedium); |
| data.Release(); |
| if (transferData.result != COM.S_OK) return null; |
| long /*int*/ hMem = stgmedium.unionField; |
| try { |
| if (transferData.type == CFSTR_INETURLIDW) { |
| /* Ensure byteCount is a multiple of 2 bytes */ |
| int size = OS.GlobalSize(hMem) / 2 * 2; |
| if (size == 0) return null; |
| char[] chars = new char[size/2]; |
| long /*int*/ ptr = OS.GlobalLock(hMem); |
| if (ptr == 0) return null; |
| try { |
| OS.MoveMemory(chars, ptr, size); |
| int length = chars.length; |
| for (int i=0; i<chars.length; i++) { |
| if (chars [i] == '\0') { |
| length = i; |
| break; |
| } |
| } |
| return new String (chars, 0, length); |
| } finally { |
| OS.GlobalUnlock(hMem); |
| } |
| } else if (transferData.type == CFSTR_INETURLID) { |
| long /*int*/ lpMultiByteStr = OS.GlobalLock(hMem); |
| if (lpMultiByteStr == 0) return null; |
| try { |
| int codePage = OS.GetACP(); |
| int cchWideChar = OS.MultiByteToWideChar (codePage, OS.MB_PRECOMPOSED, lpMultiByteStr, -1, null, 0); |
| if (cchWideChar == 0) return null; |
| char[] lpWideCharStr = new char [cchWideChar - 1]; |
| OS.MultiByteToWideChar (codePage, OS.MB_PRECOMPOSED, lpMultiByteStr, -1, lpWideCharStr, lpWideCharStr.length); |
| return new String(lpWideCharStr); |
| } finally { |
| OS.GlobalUnlock(hMem); |
| } |
| } |
| } finally { |
| OS.GlobalFree(hMem); |
| } |
| return null; |
| } |
| |
| @Override |
| protected int[] getTypeIds(){ |
| return new int[] {CFSTR_INETURLIDW, CFSTR_INETURLID}; |
| } |
| |
| @Override |
| protected String[] getTypeNames(){ |
| return new String[] {CFSTR_INETURLW, CFSTR_INETURL}; |
| } |
| |
| boolean checkURL(Object object) { |
| return object != null && (object instanceof String) && ((String)object).length() > 0; |
| } |
| |
| @Override |
| protected boolean validate(Object object) { |
| return checkURL(object); |
| } |
| } |