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diff --git a/libjava/javax/swing/text/StringContent.java b/libjava/javax/swing/text/StringContent.java
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+++ b/libjava/javax/swing/text/StringContent.java
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+/* StringContent.java --
+   Copyright (C) 2005 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+02111-1307 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package javax.swing.text;
+
+import java.io.Serializable;
+import java.util.Iterator;
+import java.util.Vector;
+
+import javax.swing.undo.AbstractUndoableEdit;
+import javax.swing.undo.CannotRedoException;
+import javax.swing.undo.CannotUndoException;
+import javax.swing.undo.UndoableEdit;
+
+/**
+ * An implementation of the <code>AbstractDocument.Content</code>
+ * interface useful for small documents or debugging. The character
+ * content is a simple character array. It's not really efficient.
+ * 
+ * <p>Do not use this class for large size.</p>
+ */
+public final class StringContent implements AbstractDocument.Content, Serializable
+{
+  private char[] content;
+
+  private int count;
+
+  private Vector positions = new Vector();
+
+  private class InsertUndo extends AbstractUndoableEdit
+  {
+    private int start;
+    
+    private int length;
+
+    private String redoContent;
+
+    public InsertUndo(int start, int length)
+    {
+      super();
+      this.start = start;
+      this.length = length;
+    }
+
+    public void undo()
+    {
+      super.undo();
+      try
+        {
+          StringContent.this.checkLocation(this.start, this.length);
+          this.redoContent = new String(StringContent.this.content, this.start, this.length);
+          StringContent.this.remove(this.start, this.length);
+        }
+      catch (BadLocationException b)
+        {
+          throw new CannotUndoException();
+        }
+    }
+    
+    public void redo()
+    {
+      super.redo();
+      try
+        {
+          StringContent.this.insertString(this.start, this.redoContent);
+        }
+      catch (BadLocationException b)
+        {
+          throw new CannotRedoException();
+        }
+    }
+  }
+
+  private class RemoveUndo extends AbstractUndoableEdit
+  {
+    private int start;
+
+    private String undoString;
+
+    public RemoveUndo(int start, String str)
+    {
+      super();
+      this.start = start;
+      this.undoString = str;
+    }
+
+    public void undo()
+    {
+      super.undo();
+      try
+        {
+          StringContent.this.insertString(this.start, this.undoString);
+        }
+      catch (BadLocationException bad)
+        {
+          throw new CannotUndoException();
+        }
+    }
+
+    public void redo()
+    {
+      super.redo();
+      try
+        {
+          int end = this.undoString.length();
+          StringContent.this.remove(this.start, end);
+        }
+      catch (BadLocationException bad)
+        {
+          throw new CannotRedoException();
+        }
+    }
+  }
+
+  private class StickyPosition implements Position
+  {
+    private int offset = -1;
+
+    public StickyPosition(int offset)
+    {
+      this.offset = offset;
+    }
+
+    private void setOffset(int offset)
+    {
+      this.offset = this.offset >= 0 ? offset : -1;
+    }
+
+    /**
+     * Should be >=0.
+     */
+    public int getOffset()
+    {
+      return offset < 0 ? 0 : offset;
+    }
+  }
+
+  public StringContent()
+  {
+    this(1);
+  }
+
+  public StringContent(int initialLength)
+  {
+    super();
+    if (initialLength < 1)
+      initialLength = 1;
+    this.content = new char[initialLength];
+    this.content[0] = '\n';
+    this.count = 1;
+  }
+
+  protected Vector getPositionsInRange(Vector v,
+                                       int offset,
+                                       int length)
+  {
+    Vector refPos = new Vector();
+    Iterator iter = this.positions.iterator();
+    while(iter.hasNext())
+      {
+        Position p = (Position)iter.next();
+        if ((offset <= p.getOffset())
+            && (p.getOffset() <= (offset + length)))
+          refPos.add(p);
+      }
+    return refPos;
+  }
+
+  public Position createPosition(int offset) throws BadLocationException
+  {
+    if (offset < this.count || offset > this.count)
+      checkLocation(offset, 0);
+    StickyPosition sp = new StickyPosition(offset);
+    this.positions.add(sp);
+    return sp;
+  }
+  
+  public int length()
+  {
+    return this.count;
+  }
+  
+  public UndoableEdit insertString(int where, String str)
+    throws BadLocationException
+  {
+    checkLocation(where, 0);
+    if (where == this.count)
+      throw new BadLocationException("Invalid location", 1);
+    if (str == null)
+      throw new NullPointerException();
+    char[] insert = str.toCharArray();
+    char[] temp = new char[this.content.length + insert.length];
+    this.count += insert.length;
+    // Copy array and insert the string.
+    if (where > 0)
+      System.arraycopy(this.content, 0, temp, 0, where);
+    System.arraycopy(insert, 0, temp, where, insert.length);
+    System.arraycopy(this.content, where, temp, (where + insert.length), (temp.length - where - insert.length));
+    if (this.content.length < temp.length)
+      this.content = new char[temp.length];
+    // Copy the result in the original char array.
+    System.arraycopy(temp, 0, this.content, 0, temp.length);
+    // Move all the positions.
+    Vector refPos = getPositionsInRange(this.positions, where, temp.length - where);
+    Iterator iter = refPos.iterator();
+    while (iter.hasNext())
+      {
+        StickyPosition p = (StickyPosition)iter.next();
+        p.setOffset(p.getOffset() + str.length());
+      }
+    InsertUndo iundo = new InsertUndo(where, insert.length);
+    return iundo;
+  }
+  
+  public UndoableEdit remove(int where, int nitems) throws BadLocationException
+  {
+    checkLocation(where, nitems);
+    char[] temp = new char[(this.content.length - nitems)];
+    this.count = this.count - nitems;
+    RemoveUndo rundo = new RemoveUndo(where, new String(this.content, where, nitems));
+    // Copy array.
+    System.arraycopy(this.content, 0, temp, 0, where);
+    System.arraycopy(this.content, where + nitems, temp, where, this.content.length - where - nitems);
+    this.content = new char[temp.length];
+    // Then copy the result in the original char array.
+    System.arraycopy(temp, 0, this.content, 0, this.content.length);
+    // Move all the positions.
+    Vector refPos = getPositionsInRange(this.positions, where, this.content.length + nitems - where);
+    Iterator iter = refPos.iterator();
+    while (iter.hasNext())
+      {
+        StickyPosition p = (StickyPosition)iter.next();
+        int result = p.getOffset() - nitems;
+        p.setOffset(result);
+        if (result < 0)
+          this.positions.remove(p);
+      }
+    return rundo;
+  }
+  
+  public String getString(int where, int len) throws BadLocationException
+  {
+    checkLocation(where, len);
+    return new String (this.content, where, len);
+  }
+  
+  public void getChars(int where, int len, Segment txt) throws BadLocationException
+  {
+    checkLocation(where, len);
+    if (txt != null)
+      {
+        txt.array = this.content;
+        txt.offset = where;
+        txt.count = len;
+      }
+  }
+
+  private void checkLocation(int where, int len) throws BadLocationException
+  {
+    if (where < 0)
+      throw new BadLocationException("Invalid location", 1);
+    else if (where > this.count)
+      throw new BadLocationException("Invalid location", this.count);
+    else if ((where + len)>this.count)
+      throw new BadLocationException("Invalid range", this.count);
+  }
+  
+}
+