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Undo manager for JavaFX

There is a newer version: 2.1.1

package org.fxmisc.undo.impl;

public interface ChangeQueue {

    interface QueuePosition {
        boolean isValid();
    }

    boolean hasNext();

    boolean hasPrev();

    C next();

    C prev();

    @SuppressWarnings({"unchecked"})
    void push(C... changes);

    QueuePosition getCurrentPosition();

    void forgetHistory();
}