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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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/*
 * @test
 * @bug 4992178
 * @summary REGRESSION: Allow unlimited number of edits in an UndoManager
 * @run main bug4992178
 */

import javax.swing.undo.AbstractUndoableEdit;
import javax.swing.undo.CannotRedoException;
import javax.swing.undo.CannotUndoException;
import javax.swing.undo.UndoManager;

public class bug4992178 {

    public static void main(String[] argv) throws Exception {
        TestUndoManager manager = new TestUndoManager();
        manager.setLimit(1);
        AbstractUndoableEdit edit = new MyUndoableEdit();
        manager.addEdit(edit);

        manager.setLimit(-1);

        manager.discardAllEdits();

        if (manager.getVectorSize() != 0) {
            throw new RuntimeException(
                "UndoManager's vector size should be 0 after discarding all changes");
        }
    }

    static class TestUndoManager extends UndoManager {
        public int getVectorSize() {
            return edits.size();
        }
    }

    static class MyUndoableEdit extends AbstractUndoableEdit {
        @Override
        public void undo() throws CannotUndoException {}
        @Override
        public void redo() throws CannotRedoException {}
    }

}