--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwtx/text/edits/TextEditCopier.d	Sat Aug 23 19:10:48 2008 +0200
@@ -0,0 +1,104 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2006 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
+ * Port to the D programming language:
+ *     Frank Benoit <benoit@tionex.de>
+ *******************************************************************************/
+module dwtx.text.edits.TextEditCopier;
+
+import dwt.dwthelper.utils;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+
+import dwtx.core.runtime.Assert;
+
+
+/**
+ * Copies a tree of text edits. A text edit copier keeps a map
+ * between original and new text edits. It can be used to map
+ * a copy back to its original edit.
+ *
+ * @since 3.0
+ */
+public final class TextEditCopier {
+
+    private TextEdit fEdit;
+    private Map fCopies;
+
+    /**
+     * Constructs a new <code>TextEditCopier</code> for the
+     * given edit. The actual copy is done by calling <code>
+     * perform</code>.
+     *
+     * @param edit the edit to copy
+     *
+     * @see #perform()
+     */
+    public TextEditCopier(TextEdit edit) {
+        super();
+        Assert.isNotNull(edit);
+        fEdit= edit;
+        fCopies= new HashMap();
+    }
+
+    /**
+     * Performs the actual copying.
+     *
+     * @return the copy
+     */
+    public TextEdit perform() {
+        TextEdit result= doCopy(fEdit);
+        if (result !is null) {
+            for (Iterator iter= fCopies.keySet().iterator(); iter.hasNext();) {
+                TextEdit edit= (TextEdit)iter.next();
+                edit.postProcessCopy(this);
+            }
+        }
+        return result;
+    }
+
+    /**
+     * Returns the copy for the original text edit.
+     *
+     * @param original the original for which the copy
+     *  is requested
+     * @return the copy of the original edit or <code>null</code>
+     *  if the original isn't managed by this copier
+     */
+    public TextEdit getCopy(TextEdit original) {
+        Assert.isNotNull(original);
+        return (TextEdit)fCopies.get(original);
+    }
+
+    //---- helper methods --------------------------------------------
+
+    private TextEdit doCopy(TextEdit edit) {
+        TextEdit result= edit.doCopy();
+        List children= edit.internalGetChildren();
+        if (children !is null) {
+            List newChildren= new ArrayList(children.size());
+            for (Iterator iter= children.iterator(); iter.hasNext();) {
+                TextEdit childCopy= doCopy((TextEdit)iter.next());
+                childCopy.internalSetParent(result);
+                newChildren.add(childCopy);
+            }
+            result.internalSetChildren(newChildren);
+        }
+        addCopy(edit, result);
+        return result;
+    }
+
+    private void addCopy(TextEdit original, TextEdit copy) {
+        fCopies.put(original, copy);
+    }
+}