Examples of java.beans.Expression

java.beans.Expression
An Expression object represents a primitive expression in which a single method is applied to a target and a set of arguments to return a result - as in "a.getFoo()".
In addition to the properties of the super class, the Expression object provides a value which is the object returned when this expression is evaluated. The return value is typically not provided by the caller and is instead computed by dynamically finding the method and invoking it when the first call to getValue is made. @see #getValue @see #setValue @since 1.4 @version 1.3 11/15/00 @author Philip Milne

                        @SuppressWarnings("unchecked")
                        @Override
                        protected void initialize(Class type,
                                Object oldInstance, Object newInstance,
                                Encoder out) {
                            out.writeExpression(new Expression(object,
                                    oldInstance, "go", new Object[] {}));
                        }
                    });
            AType a = new AType();

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   * Java 1.5 workaround. From http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=5015403
   */
  public static class EnumDelegate extends DefaultPersistenceDelegate {
    @Override
    protected Expression instantiate(Object oldInstance, Encoder out) {
      return new Expression(Enum.class, "valueOf", new Object[] {oldInstance.getClass(),
          ((Enum<?>) oldInstance).name()});
    }

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  public static class MapDelegate extends DefaultPersistenceDelegate {
    @Override
    protected Expression instantiate(Object oldInstance, Encoder out) {
      Map oldMap = (Map) oldInstance;
      HashMap newMap = new HashMap(oldMap);
      return new Expression(newMap, HashMap.class, "new", new Object[] {});
    }

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  public static class SetDelegate extends DefaultPersistenceDelegate {
    @Override
    protected Expression instantiate(Object oldInstance, Encoder out) {
      Set oldSet = (Set) oldInstance;
      HashSet newSet = new HashSet(oldSet);
      return new Expression(newSet, HashSet.class, "new", new Object[] {});
    }

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  public static class ListDelegate extends DefaultPersistenceDelegate {
    @Override
    protected Expression instantiate(Object oldInstance, Encoder out) {
      List oldList = (List) oldInstance;
      ArrayList newList = new ArrayList(oldList);
      return new Expression(newList, ArrayList.class, "new", new Object[] {});
    }

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  }


  public static class CollectionPersistenceDelegate extends DefaultPersistenceDelegate {
    @Override
    protected Expression instantiate(Object oldInstance, Encoder out) {
      return new Expression(oldInstance, oldInstance.getClass(), "new", null);
    }

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    /**
     * The test checks the correct constructor is initialized
     */
    public void testConstructor() throws Exception {
        Expression expr = new Expression(SampleBean.class, "new",
                new Object[] { "hello" });
        Object result = expr.getValue();
        if (result != null && result instanceof SampleBean) {
            SampleBean bean = (SampleBean) result;
            assertEquals("hello", bean.getText());
        } else {
            fail("Cannot instantiate an instance of Bean class.");

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    /**
     * The test checks the correct static method is initialized
     */
    public void testStatic() throws Exception {
        SampleBean theBean = new SampleBean();
        Expression expr = new Expression(SampleBean.class, "create",
                new Object[] { "hello", theBean });


        Object result = expr.getValue();
        if (result != null && result instanceof SampleBean) {
            SampleBean bean = (SampleBean) result;
            assertEquals("hello", bean.getText());
            assertEquals(theBean, bean.getObject());
        } else {

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    /**
     * The test checks the correct getter is initialized
     */
    public void testGetter() throws Exception {
        Expression expr = new Expression(new SampleBean("hello"), "getText",
                new Object[] {});


        Object result = expr.getValue();
        if (result != null && result instanceof String) {
            assertEquals("hello", result);
        } else {
            fail("Result of SampleBean.getText() call is not "
                    + "of String type.");

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    /**
     * The test checks the correct array getter is initialized
     */
    public void testArrayGetter() throws Exception {
        int[] a = { 1, 2, 3 };
        Expression expr = new Expression(a, "get",
                new Object[] { new Integer(1) });


        Object result = expr.getValue();
        if (result != null && result instanceof Integer) {
            assertEquals(new Integer(2), result);
        } else {
            fail("Result of array getter is not of Integer type.");
        }

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