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

    /*
     * Test the method getValue() with the special method Class.forName().
     */
    public void testGetValue_UnboundedClassForName() throws Exception {
        Object[] arguments = new String[] { Expression.class.getName() };
        Expression t = new Expression(Class.class, "forName", arguments);
        assertSame(Expression.class, t.getValue());


        // t = new Expression(String.class, "forName", arguments);
        // assertSame(this.getClass(), t.getValue());
    }

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     * Test the method getValue() with a normal array object, the method name
     * "get" and valid arguments.
     */
    public void testGetValue_UnboundedArrayGet() throws Exception {
        Object[] array = new Object[] { "test" };
        Expression t = new Expression(array, "get", new Object[] { new Integer(
                0) });
        assertEquals("test", t.getValue());
    }

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     * Test the method getValue() with a normal array object, the method name
     * "getInt" and invalid arguments.
     */
    public void testGetValue_UnboundedArrayInvalidSetInt() throws Exception {
        int[] array = new int[] { 1 };
        Expression t = new Expression(array, "getInt",
                new Object[] { new Integer(0) });
        try {
            t.getValue();
            fail("Should throw NoSuchMethodException!");
        } catch (NoSuchMethodException ex) {
            // expected
        }
    }

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     * Test the method getValue() with a normal array object, the method name
     * "gets".
     */
    public void testGetValue_UnboundedArrayInvalidName() throws Exception {
        Object[] array = new Object[] { "test" };
        Expression t = new Expression(array, "gets", new Object[] {
                new Integer(0), new Object() });
        try {
            t.getValue();
            fail("Should throw NoSuchMethodException!");
        } catch (NoSuchMethodException ex) {
            // expected
        }
    }

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     * Note: decided by definition position!
     */
    public void testGetValue_UnboundedPrimitiveVSWrapper() throws Exception {
        MockObject mo = new MockObject(false);
        Object[] arguments = new Object[] { new Integer(1) };
        Expression t = new Expression(mo, "methodB", arguments);
        assertEquals("methodB2", t.getValue());
        MockObject.assertCalled("methodB2", arguments);


        arguments = new Object[] { Boolean.FALSE };
        t = new Expression(mo, "methodB", arguments);
        assertEquals("methodB3", t.getValue());
        MockObject.assertCalled("methodB3", arguments);
    }

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     * valid arguments.
     */
    public void testGetValue_UnboundedVoidMethod() throws Exception {
        MockObject mo = new MockObject(false);
        Object[] arguments = new Object[] { new Integer(1) };
        Expression t = new Expression(mo, "voidMethod", arguments);
        assertNull(t.getValue());
        MockObject.assertCalled("voidMethod2", arguments);
    }

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     * package.
     */
    public void testGetValue_ProtectedMethodWithPackage() throws Exception {
        DefaultPersistenceDelegate dpd = new DefaultPersistenceDelegate();
        Object[] arguments = new Object[] { "test", "test" };
        Expression t = new Expression(dpd, "mutatesTo", arguments);
        try {
            t.getValue();
            fail("Should throw NoSuchMethodException!");
        } catch (NoSuchMethodException e) {
            // expected
        }
    }

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     */
    public void testGetValue_ApplicableViaTypeConversion() throws Exception {
        MockObject mo = new MockObject(false);
        // mo.methodB('c');
        Object[] arguments = new Object[] { new Character((char) 1) };
        Expression t = new Expression(mo, "methodB", arguments);
        try {
            t.getValue();
            fail("Should throw NoSuchMethodException!");
        } catch (NoSuchMethodException e) {
            // expected
        }
    }

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        }
    }


    public void testGetValue_returnNull() throws Exception {
        MockTarget target = new MockTarget();
        Expression e = new Expression(target, "aMethod", new Object[] {});
        Object got = e.getValue();
        assertTrue(MockTarget.isCalled());
        got = e.getValue();
        assertFalse(MockTarget.isCalled());
    }

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        // TBD
    }


    public void testInstantiate_Normal() throws Exception {
        Object obj = new int[] { 1, 2, 3 };
        Expression exp = pd.instantiate(obj, new Encoder());
        assertSame(obj, exp.getValue());
        assertSame(Array.class, exp.getTarget());
        assertEquals("newInstance", exp.getMethodName());
        assertEquals(2, exp.getArguments().length);
        assertSame(Integer.TYPE, exp.getArguments()[0]);
        assertEquals(new Integer(3), exp.getArguments()[1]);
    }

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