| /******************************************************************************* |
| * Copyright (c) 2000, 2004 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 java.net.*; |
| |
| 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. See |
| * <code>Transfer</code> for additional information. The first string in the |
| * array is mandatory and must contain the fully specified url. The second |
| * string in the array is optional and if present contains the title for the |
| * page. |
| * |
| * <p>An example of a java <code>String[]</code> containing a URL is shown |
| * below:</p> |
| * |
| * <code><pre> |
| * String[] urlData = new String[] {"http://www.eclipse.org", "Eclipse.org Main Page"}; |
| * </code></pre> |
| */ |
| /*public*/ class URLTransfer extends ByteArrayTransfer { |
| |
| static URLTransfer _instance = new URLTransfer(); |
| 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 and optionally a title |
| * 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 a URL and optionally, a title |
| * @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){ |
| 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)[0]; |
| 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; |
| } |
| int /*long*/ 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; |
| return; |
| } |
| |
| /** |
| * This implementation of <code>nativeToJava</code> converts a platform specific |
| * representation of a URL and optionally, a title 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 a URL and optionally a title 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 /*long*/ hMem = stgmedium.unionField; |
| try { |
| int /*long*/ 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[]{new String(lpWideCharStr)}; |
| } finally { |
| OS.GlobalUnlock(hMem); |
| } |
| } finally { |
| OS.GlobalFree(hMem); |
| } |
| } |
| |
| protected int[] getTypeIds(){ |
| return new int[] {CFSTR_INETURLID}; |
| } |
| |
| protected String[] getTypeNames(){ |
| return new String[] {CFSTR_INETURL}; |
| } |
| |
| boolean checkURL(Object object) { |
| if (object == null || !(object instanceof String[]) || ((String[])object).length == 0) return false; |
| String[] strings = (String[])object; |
| if (strings[0] == null || strings[0].length() == 0) return false; |
| try { |
| new URL(strings[0]); |
| } catch (java.net.MalformedURLException e) { |
| return false; |
| } |
| return true; |
| } |
| |
| protected boolean validate(Object object) { |
| return checkURL(object); |
| } |
| } |