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Java example source code file (EditableAtEndDocument.java)

This example Java source code file (EditableAtEndDocument.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

attributeset, badlocationexception, editableatenddocument, plaindocument, string, text

The EditableAtEndDocument.java Java example source code

/*
 * Copyright (c) 2000, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

package sun.jvm.hotspot.ui;

import javax.swing.text.*;

/** This class implements a special type of document in which edits
    can only be performed at the end, from "mark" to the end of the
    document. Thanks to Scott Violet for suggesting to subclass a
    Document implementation for this purpose. (Can't do it with
    DocumentEvents or UndoableEditEvents; however, in 1.4, there will
    be a DocumentFilter which will allow this kind of functionality.)  */

public class EditableAtEndDocument extends PlainDocument {
  private int mark;

  public void insertString(int offset, String text, AttributeSet a)
    throws BadLocationException {
    int len = getLength();
    super.insertString(len, text, a);
  }

  public void remove(int offs, int len) throws BadLocationException {
    int start = offs;
    int end = offs + len;

    int markStart = mark;
    int markEnd = getLength();

    if ((end < markStart) || (start > markEnd)) {
      // no overlap
      return;
    }

    // Determine interval intersection
    int cutStart = Math.max(start, markStart);
    int cutEnd = Math.min(end, markEnd);
    super.remove(cutStart, cutEnd - cutStart);
  }

  public void setMark() {
    mark = getLength();
  }

  public String getMarkedText() throws BadLocationException {
    return getText(mark, getLength() - mark);
  }

  /** Used to reset the contents of this document */
  public void clear() {
    try {
      super.remove(0, getLength());
      setMark();
    }
    catch (BadLocationException e) {
    }
  }
}

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