--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/agent/src/share/classes/sun/jvm/hotspot/ui/HistoryComboBox.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,66 @@
+/*
+ * Copyright 2004 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+package sun.jvm.hotspot.ui;
+
+
+import java.awt.event.*;
+import javax.swing.*;
+import javax.swing.event.*;
+
+/** Provides an editable text field with history. */
+
+public class HistoryComboBox extends JComboBox {
+  static final int HISTORY_LENGTH = 15;
+
+  public HistoryComboBox() {
+    setEditable(true);
+    addActionListener(new ActionListener() {
+        public void actionPerformed(ActionEvent e) {
+          Object text = getSelectedItem();
+          if (text != null) {
+            setText((String)text);
+          }
+        }
+      });
+  }
+
+  public String getText() {
+    Object text = getSelectedItem();
+    if (text == null) {
+      return "";
+    }
+    return (String)text;
+  }
+
+  public void setText(String text) {
+    removeItem(text);
+    insertItemAt(text, 0);
+    setSelectedItem(text);
+    int length = getModel().getSize();
+    while (length > HISTORY_LENGTH) {
+      removeItemAt(--length);
+    }
+  }
+}