--- /dev/null
+/*******************************************************************************
+ * Copyright (c) 2000, 20007 IBM Corporation and others.
+ *
+ * This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License 2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * 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>
+ *
+ * <pre><code>
+ * 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 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 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 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 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 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);
+}
+}
Code Review / simantics / platform.git / blobdiff