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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    @Override
    protected Expression instantiate(Object oldInstance, Encoder out) {
      Date dateVal = (Date)oldInstance;
      Object[] args = { dateVal.getTime() };
      return new Expression(dateVal, dateVal.getClass(), "new", args);
    }

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  public static class CommonTokenDelegate extends PersistenceDelegate {
    @Override
    protected Expression instantiate(Object oldInstance, Encoder out) {
      CommonToken ct = (CommonToken)oldInstance;
      Object[] args = {ct.getType(), ct.getText()};
      return new Expression(ct, ct.getClass(), "new", args);
    }

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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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                        @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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        MockPersistenceDelegate pd = new MockPersistenceDelegate(new String[] {
                "prop1", "prop2" });
        MockBean b = new MockBean();
        Encoder enc = new Encoder();
        b.setAll("bean1", 2);
        Expression e = pd.instantiate(b, enc);
        assertSame(b, e.getValue());
        assertSame(MockBean.class, e.getTarget());
        assertEquals("new", e.getMethodName());
        assertSame("bean1", e.getArguments()[0]);
        assertEquals(new Integer(2), e.getArguments()[1]);
    }

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