Examples of java.beans.VetoableChangeSupport.addVetoableChangeListener()

java.beans.VetoableChangeSupport.addVetoableChangeListener()
Add a VetoableListener to the listener list. The listener is registered for all properties. The same listener object may be added more than once, and will be called as many times as it is added. If listener is null, no exception is thrown and no action is taken. @param listener The VetoableChangeListener to be added

        VetoableChangeSupport support = new VetoableChangeSupport(source);


        VetoableChangeListener proxy = EventHandler.create(
                VetoableChangeListener.class, source, "setText");
        String propertyName = null;
            support.addVetoableChangeListener(propertyName, proxy);
    }


    /*
     * add listeners to an invalid property
     */

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        VetoableChangeSupport support = new VetoableChangeSupport(source);


        VetoableChangeListener proxy = EventHandler.create(
                VetoableChangeListener.class, source, "setText");
        String propertyName = "label_invalid";
        support.addVetoableChangeListener(propertyName, proxy);


        VetoableChangeListener[] listeners1 = support
                .getVetoableChangeListeners();
        VetoableChangeListener[] listeners2 = support
                .getVetoableChangeListeners("label_invalid");

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                VetoableChangeListener.class, source, "setText");
        VetoableChangeListener proxy2 = EventHandler.create(
                VetoableChangeListener.class, source, "setText");


        String propertyName = "label";
        support.addVetoableChangeListener(propertyName, proxy);
        support.addVetoableChangeListener(propertyName, proxy2);


        assertTrue(support.hasListeners(propertyName));
        assertFalse(support.hasListeners("text"));

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        VetoableChangeListener proxy2 = EventHandler.create(
                VetoableChangeListener.class, source, "setText");


        String propertyName = "label";
        support.addVetoableChangeListener(propertyName, proxy);
        support.addVetoableChangeListener(propertyName, proxy2);


        assertTrue(support.hasListeners(propertyName));
        assertFalse(support.hasListeners("text"));


        VetoableChangeListener[] listeners1 = support

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        MockSource source = new MockSource();
        VetoableChangeSupport support = new VetoableChangeSupport(source);


        VetoableChangeListener proxy = EventHandler.create(
                VetoableChangeListener.class, source, "setText");
        support.addVetoableChangeListener(proxy);


        assertTrue(support.hasListeners("label"));
        assertTrue(support.hasListeners("text"));


        VetoableChangeListener[] listeners1 = support

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        MockSource source = new MockSource();
        VetoableChangeSupport support = new VetoableChangeSupport(source);


        VetoableChangeListener proxy = EventHandler.create(
                VetoableChangeListener.class, source, "setText");
        support.addVetoableChangeListener(proxy);
        support.addVetoableChangeListener(proxy);


        assertTrue(support.hasListeners("label"));
        assertTrue(support.hasListeners("text"));

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        VetoableChangeSupport support = new VetoableChangeSupport(source);


        VetoableChangeListener proxy = EventHandler.create(
                VetoableChangeListener.class, source, "setText");
        support.addVetoableChangeListener(proxy);
        support.addVetoableChangeListener(proxy);


        assertTrue(support.hasListeners("label"));
        assertTrue(support.hasListeners("text"));


        VetoableChangeListener[] listeners1 = support

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        VetoableChangeListener proxy = EventHandler.create(
                VetoableChangeListener.class, source, "setText");
        VetoableChangeListener proxy2 = EventHandler.create(
                VetoableChangeListener.class, source, "getText");
        support.addVetoableChangeListener(proxy);
        support.addVetoableChangeListener(proxy2);


        assertTrue(support.hasListeners("label"));
        assertTrue(support.hasListeners("text"));

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        VetoableChangeListener proxy = EventHandler.create(
                VetoableChangeListener.class, source, "setText");
        VetoableChangeListener proxy2 = EventHandler.create(
                VetoableChangeListener.class, source, "getText");
        support.addVetoableChangeListener(proxy);
        support.addVetoableChangeListener(proxy2);


        assertTrue(support.hasListeners("label"));
        assertTrue(support.hasListeners("text"));


        VetoableChangeListener[] listeners1 = support

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        VetoableChangeListenerProxy listenerProxy = new VetoableChangeListenerProxy(
                propertyName, proxy);
        assertFalse(support.hasListeners("label"));
        try{
            support.addVetoableChangeListener(listenerProxy);
            fail("should throw NPE");
        }catch(NullPointerException e){
            //expected
            e.printStackTrace();
        }

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