--- /dev/null	2015-04-26 06:51:08.003313989 -0700
+++ new/jdk/src/jdk.jline/share/classes/jdk/internal/jline/console/history/History.java	2015-06-18 03:04:45.866672591 -0700
@@ -0,0 +1,106 @@
+/*
+ * Copyright (c) 2002-2012, the original author or authors.
+ *
+ * This software is distributable under the BSD license. See the terms of the
+ * BSD license in the documentation provided with this software.
+ *
+ * http://www.opensource.org/licenses/bsd-license.php
+ */
+package jdk.internal.jline.console.history;
+
+import java.util.Iterator;
+import java.util.ListIterator;
+
+/**
+ * Console history.
+ *
+ * @author <a href="mailto:mwp1@cornell.edu">Marc Prud'hommeaux</a>
+ * @author <a href="mailto:jason@planet57.com">Jason Dillon</a>
+ * @since 2.3
+ */
+public interface History
+    extends Iterable<History.Entry>
+{
+    int size();
+
+    boolean isEmpty();
+
+    int index();
+
+    void clear();
+
+    CharSequence get(int index);
+
+    void add(CharSequence line);
+
+    /**
+     * Set the history item at the given index to the given CharSequence.
+     *
+     * @param index the index of the history offset
+     * @param item the new item
+     * @since 2.7
+     */
+    void set(int index, CharSequence item);
+
+    /**
+     * Remove the history element at the given index.
+     *
+     * @param i the index of the element to remove
+     * @return the removed element
+     * @since 2.7
+     */
+    CharSequence remove(int i);
+
+    /**
+     * Remove the first element from history.
+     *
+     * @return the removed element
+     * @since 2.7
+     */
+    CharSequence removeFirst();
+
+    /**
+     * Remove the last element from history
+     *
+     * @return the removed element
+     * @since 2.7
+     */
+    CharSequence removeLast();
+
+    void replace(CharSequence item);
+
+    //
+    // Entries
+    //
+
+    interface Entry
+    {
+        int index();
+
+        CharSequence value();
+    }
+
+    ListIterator<Entry> entries(int index);
+
+    ListIterator<Entry> entries();
+
+    Iterator<Entry> iterator();
+
+    //
+    // Navigation
+    //
+
+    CharSequence current();
+
+    boolean previous();
+
+    boolean next();
+
+    boolean moveToFirst();
+
+    boolean moveToLast();
+
+    boolean moveTo(int index);
+
+    void moveToEnd();
+}