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

    public void testInstantiate_NullEncoder() throws Exception {
        MockPersistenceDelegate pd = new MockPersistenceDelegate(new String[] {
                "prop1", "prop2" });
        MockBean b = new MockBean();
        b.setAll("bean1", 2);
        Expression e = pd.instantiate(b, null);
        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]);
        assertEquals(2, e.getArguments().length);
    }

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     */
    public void testInstantiate_NoProperty() throws Exception {
        MockPersistenceDelegate pd = new MockPersistenceDelegate();
        MockBean b = new MockBean();
        b.setAll("bean1", 2);
        Expression e = pd.instantiate(b, new Encoder());
        assertSame(b, e.getValue());
        assertSame(MockBean.class, e.getTarget());
        assertEquals("new", e.getMethodName());
        assertEquals(0, e.getArguments().length);
    }

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            public void exceptionThrown(Exception e) {
                CallVerificationStack.getInstance().push(e);
            }
        };
        enc.setExceptionListener(el);
        Expression e = pd.instantiate(b, enc);
        assertSame(b, e.getValue());
        assertSame(MockBean.class, e.getTarget());
        assertEquals("new", e.getMethodName());
        assertEquals(2, e.getArguments().length);
        assertSame(b.getProp1(), e.getArguments()[0]);
        assertSame(null, e.getArguments()[1]);
        assertTrue(CallVerificationStack.getInstance().pop() instanceof Exception);


        enc.setExceptionListener(null);
        assertNotNull(enc.getExceptionListener());
        e = pd.instantiate(b, enc);
        assertSame(b, e.getValue());
        assertSame(MockBean.class, e.getTarget());
        assertEquals("new", e.getMethodName());
        assertEquals(2, e.getArguments().length);
        assertSame(b.getProp1(), e.getArguments()[0]);
        assertSame(null, e.getArguments()[1]);
    }

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    public void testInstantiate_InvalidGetter() throws Exception {
        MockPersistenceDelegate pd = new MockPersistenceDelegate(new String[] {
                "prop1", "prop4" });
        MockBean b = new MockBean();
        b.setAll("bean1", 2);
        Expression e = pd.instantiate(b, new Encoder());
        assertSame(b, e.getValue());
        assertSame(MockBean.class, e.getTarget());
        assertEquals("new", e.getMethodName());
        assertEquals(2, e.getArguments().length);
        assertSame(b.getProp1(), e.getArguments()[0]);
        assertSame(null, e.getArguments()[1]);
    }

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    public void testInstantiate_ExceptionalGetter() throws Exception {
        MockPersistenceDelegate pd = new MockPersistenceDelegate(new String[] {
                "prop1", "prop5" });
        MockBean b = new MockBean();
        b.setAll("bean1", 2);
        Expression e = pd.instantiate(b, new Encoder());
        assertSame(b, e.getValue());
        assertSame(MockBean.class, e.getTarget());
        assertEquals("new", e.getMethodName());
        assertEquals(2, e.getArguments().length);
        assertSame(b.getProp1(), e.getArguments()[0]);
        assertSame(null, e.getArguments()[1]);
    }

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    public void testInstantiate_ErrorGetter() throws Exception {
        MockPersistenceDelegate pd = new MockPersistenceDelegate(new String[] {
                "prop1", "prop7" });
        MockBean b = new MockBean();
        b.setAll("bean1", 2);
        Expression e = pd.instantiate(b, new Encoder());
        assertSame(b, e.getValue());
        assertSame(MockBean.class, e.getTarget());
        assertEquals("new", e.getMethodName());
        assertEquals(2, e.getArguments().length);
        assertSame(b.getProp1(), e.getArguments()[0]);
        assertSame(null, e.getArguments()[1]);
    }

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    public void testInstantiate_PrivateGetter() throws Exception {
        MockPersistenceDelegate pd = new MockPersistenceDelegate(new String[] {
                "prop1", "prop6" });
        MockBean b = new MockBean();
        b.setAll("bean1", 2);
        Expression e = pd.instantiate(b, new Encoder());
        assertSame(b, e.getValue());
        assertSame(MockBean.class, e.getTarget());
        assertEquals("new", e.getMethodName());
        assertEquals(2, e.getArguments().length);
        assertSame(b.getProp1(), e.getArguments()[0]);
        assertSame(null, e.getArguments()[1]);
    }

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    public void testInstantiate_InitialUpperCasePropName() throws Exception {
        String[] props = new String[] { "Prop1", "prop2" };
        MockPersistenceDelegate pd = new MockPersistenceDelegate(props);
        MockBean b = new MockBean();
        b.setAll("bean1", 2);
        Expression e = pd.instantiate(b, new Encoder());
        assertSame(b, e.getValue());
        assertSame(MockBean.class, e.getTarget());
        assertEquals("new", e.getMethodName());
        assertEquals(2, e.getArguments().length);
        assertSame(b.getProp1(), e.getArguments()[0]);
        assertEquals(new Integer(2), e.getArguments()[1]);
    }

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        enc.setExceptionListener(new ExceptionListener() {
            public void exceptionThrown(Exception e) {
                CallVerificationStack.getInstance().push(e);
            }
        });
        Expression e = pd.instantiate(b, enc);
        assertSame(b, e.getValue());
        assertSame(MockNoGetterBean2.class, e.getTarget());
        assertEquals("new", e.getMethodName());
        assertEquals(1, e.getArguments().length);
        assertSame(null, e.getArguments()[0]);
        assertFalse(CallVerificationStack.getInstance().empty());
    }

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     */
    public void testInstantiate_NotRegularGetter() throws Exception {
        MockPersistenceDelegate pd = new MockPersistenceDelegate(
                new String[] { "prop" });
        MockFoo2 b = new MockFoo2(2);
        Expression e = pd.instantiate(b, new Encoder());


        assertSame(b, e.getValue());
        assertSame(MockFoo2.class, e.getTarget());
        assertEquals("new", e.getMethodName());
        assertEquals(1, e.getArguments().length);
        assertNull(e.getArguments()[0]);
    }

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