--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwt/dnd/TextTransfer.d	Sat Aug 09 17:00:02 2008 +0200
@@ -0,0 +1,154 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2007 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
+ *******************************************************************************/
+module dwt.dnd;
+
+import dwt.internal.carbon.CFRange;
+import dwt.internal.carbon.OS;
+ 
+/**
+ * The class <code>TextTransfer</code> provides a platform specific mechanism 
+ * for converting plain text represented as a java <code>String</code> 
+ * to a platform specific representation of the data and vice versa.
+ * 
+ * <p>An example of a java <code>String</code> containing plain text is shown 
+ * below:</p>
+ * 
+ * <code><pre>
+ *     String textData = "Hello World";
+ * </code></pre>
+ * 
+ * @see Transfer
+ */
+public class TextTransfer : ByteArrayTransfer {
+
+    static TextTransfer _instance = new TextTransfer();
+    static final String TEXT = "TEXT"; //$NON-NLS-1$
+    static final String UTEXT = "utxt"; //$NON-NLS-1$
+    static final int TEXTID = OS.kScrapFlavorTypeText;
+    static final int UTEXTID = OS.kScrapFlavorTypeUnicode;
+
+TextTransfer() {}
+
+/**
+ * Returns the singleton instance of the TextTransfer class.
+ *
+ * @return the singleton instance of the TextTransfer class
+ */
+public static TextTransfer getInstance () {
+    return _instance;
+}
+
+/**
+ * This implementation of <code>javaToNative</code> converts plain text
+ * represented by a java <code>String</code> to a platform specific representation.
+ * 
+ * @param object a java <code>String</code> containing 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
+ *  
+ * @see Transfer#javaToNative
+ */
+public void javaToNative (Object object, TransferData transferData) {
+    if (!checkText(object) || !isSupportedType(transferData)) {
+        DND.error(DND.ERROR_INVALID_DATA);
+    }
+    String String = (String)object;
+    char[] chars = new char[String.length()];
+    String.getChars (0, chars.length, chars, 0);
+    transferData.result = -1;
+    switch (transferData.type) {
+        case TEXTID: {
+            int cfString = OS.CFStringCreateWithCharacters(OS.kCFAllocatorDefault, chars, chars.length);
+            if (cfString is 0) return;
+            byte[] buffer = null;
+            try {
+                CFRange range = new CFRange();
+                range.length = chars.length;
+                int encoding = OS.CFStringGetSystemEncoding();
+                int[] size = new int[1];
+                int numChars = OS.CFStringGetBytes(cfString, range, encoding, (byte)'?', true, null, 0, size);
+                if (numChars is 0) return;
+                buffer = new byte[size[0]];
+                numChars = OS.CFStringGetBytes(cfString, range, encoding, (byte)'?', true, buffer, size [0], size);
+                if (numChars is 0) return;
+            } finally {
+                OS.CFRelease(cfString);
+            }
+            transferData.data = new byte[1][];
+            transferData.data[0] = buffer;
+            transferData.result = OS.noErr;
+            break;
+        }
+        case UTEXTID: {
+            byte[] buffer = new byte[chars.length * 2];
+            OS.memmove(buffer, chars, buffer.length);
+            transferData.data = new byte[1][];
+            transferData.data[0] = buffer;
+            transferData.result = OS.noErr;
+            break;
+        }
+    }
+}
+
+/**
+ * This implementation of <code>nativeToJava</code> converts a platform specific 
+ * representation of plain text 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 text if the conversion was successful; otherwise null
+ * 
+ * @see Transfer#nativeToJava
+ */
+public Object nativeToJava(TransferData transferData){
+    if (!isSupportedType(transferData) || transferData.data is null) return null;
+    if (transferData.data.length is 0 || transferData.data[0].length is 0) return null;
+    byte[] buffer = transferData.data[0];
+    switch (transferData.type) {
+        case TEXTID: {
+            int encoding = OS.CFStringGetSystemEncoding();
+            int cfString = OS.CFStringCreateWithBytes(OS.kCFAllocatorDefault, buffer, buffer.length, encoding, true);
+            if (cfString is 0) return null;
+            try {
+                int length = OS.CFStringGetLength(cfString);
+                if (length is 0) return null;
+                char[] chars = new char[length];
+                CFRange range = new CFRange();
+                range.length = length;
+                OS.CFStringGetCharacters(cfString, range, chars);
+                return new String(chars);
+            } finally {
+                OS.CFRelease(cfString);
+            }
+        }
+        case UTEXTID: {
+            char[] chars = new char[(buffer.length + 1) / 2];
+            OS.memmove(chars, buffer, buffer.length);
+            return new String(chars);
+        }
+    }
+    return null;
+}
+
+protected int[] getTypeIds() {
+    return new int[] {UTEXTID, TEXTID};
+}
+
+protected String[] getTypeNames() {
+    return new String[] {UTEXT, TEXT};
+}
+
+bool checkText(Object object) {
+    return (object !is null && object instanceof String && ((String)object).length() > 0);
+}
+protected bool validate(Object object) {
+    return checkText(object);
+}
+}