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 a null method name.
     */
    public void testGetValue_UnboundedNullMethodName() throws Exception {
        MockObject mo = new MockObject(false);
        Expression t = new Expression(mo, null, new Object[] { null, null });
        try {
            t.getValue();
            fail("Should throw NullPointerException!");
        } catch (NullPointerException ex) {
            // expected
        }
    }

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     * Test the method getValue() with a normal object, a valid method and
     * invalid arguments (in terms of type, numbers, etc.).
     */
    public void testGetValue_UnboundedInvalidArguments() throws Exception {
        MockObject mo = new MockObject(false);
        Expression t = new Expression(mo, "method", new Object[] {
                new Object(), new Object(), new Object() });
        try {
            t.getValue();
            fail("Should throw NoSuchMethodException!");
        } catch (NoSuchMethodException ex) {
            // expected
        }
    }

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     * valid arguments.
     */
    public void testGetValue_UnboundedOverloadedMethods() throws Exception {
        MockObject mo = new MockObject(false);
        Object[] arguments = new Object[] { new Object() };
        Expression t = new Expression(mo, "method", arguments);
        assertEquals("method2", t.getValue());
        MockObject.assertCalled("method2", arguments);


        arguments = new Object[] { "test" };
        t = new Expression(mo, "method", arguments);
        assertEquals("method3", t.getValue());
        MockObject.assertCalled("method3", arguments);
    }

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    /*
     * Test the method getValue() with a normal object, the method name "new"
     * and valid arguments.
     */
    public void testGetValue_UnboundedNormalConstructor() throws Exception {
        Expression t = new Expression(MockObject.class, "new", new Object[0]);
        t.getValue();
        MockObject.assertCalled("new0", new Object[0]);
        t = new Expression(MockObject.class, "new", null);
        assertTrue(t.getValue() instanceof MockObject);
        MockObject.assertCalled("new0", new Object[0]);
    }

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    /*
     * Test the method getValue() with a normal object, the method name "new"
     * that throws an exception and valid arguments.
     */
    public void testGetValue_UnboundedExceptionalConstructor() throws Exception {
        Expression t = new Expression(MockObject.class, "new", new Object[] {
                null, null });
        try {
            t.getValue();
            fail("Should throw NullPointerException!");
        } catch (NullPointerException ex) {
            // expected
        }
        MockObject.assertCalled("new4", new Object[] { null, null });

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    /*
     * Test the method getValue() with a normal object, the method name "new"
     * and invalid arguments (in terms of type, numbers, etc.).
     */
    public void testGetValue_UnboundedNonExistingConstructor() throws Exception {
        Expression t = new Expression(MockObject.class, "new", new Object[] {
                null, null, null });
        try {
            t.getValue();
            fail("Should throw NoSuchMethodException!");
        } catch (NoSuchMethodException ex) {
            // expected
        }
    }

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     * 
     * Note: decided by definition position.
     */
    public void testGetValue_UnboundedOverloadedConstructors() throws Exception {
        Object[] arguments = new Object[] { new Object() };
        Expression t = new Expression(MockObject.class, "new", arguments);
        t.getValue();
        MockObject.assertCalled("new2", arguments);


        //FIXME: the following 2 commented assert cannot pass neither in RI nor in Harmony (HARMONY-4392),
        // waiting for dev-list approval to fix Harmony implementation following spec 
        arguments = new Object[] { "test" };
        t = new Expression(MockObject.class, "new", arguments);
        assertTrue(t.getValue() instanceof MockObject);
//         MockObject.assertCalled("new3", arguments);


        arguments = new Object[] { new Integer(1) };
        t = new Expression(MockObject.class, "new", arguments);
        assertTrue(t.getValue() instanceof MockObject);
//        MockObject.assertCalled("new1-2", arguments);
    }

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     * and valid arguments.
     */
    public void testGetValue_UnboundedNormalStaticMethodViaClass()
            throws Exception {
        Object[] arguments = new Object[] { new Object() };
        Expression t = new Expression(MockObject.class, "staticMethod",
                arguments);
        assertEquals("staticMethod", t.getValue());
        MockObject.assertCalled("staticMethod", arguments);
    }

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     */
    public void testGetValue_UnboundedNormalStaticMethodViaObject()
            throws Exception {
        MockObject mo = new MockObject(false);
        Object[] arguments = new Object[] { new Object() };
        Expression t = new Expression(mo, "staticMethod", arguments);
        assertEquals("staticMethod", t.getValue());
        MockObject.assertCalled("staticMethod", arguments);
    }

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     * a method of the same signature as Class.forName(String), a static method
     * name "forName" and valid argument "string".
     */
    public void testGetValue_UnboundedAmbitiousStaticMethod() throws Exception {
        Object[] arguments = new Object[] { "test" };
        Expression t = new Expression(MockObject.class, "forName", arguments);
        assertNull(t.getValue());
        MockObject.assertCalled("forName", arguments);


        t = new Expression(String.class, "forName",
                new Object[] { "java.lang.String" });
        assertSame(String.class, t.getValue());
    }

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