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 setValue() method when the value of the expression is set by the
     * constructor.
     */
    public void testSetValue_Constructor() throws Exception {
        MockObject mo = new MockObject(false);
        Expression t = new Expression(mo, mo, "method", new Object[0]);
        assertSame(mo, t.getValue());
        MockObject.assertNotCalled();
        t.setValue(null);
        assertSame(null, t.getValue());
        MockObject.assertNotCalled();
    }

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     * Test the setValue() method when the value of the expression is set by a
     * previous call to setValue().
     */
    public void testSetValue_Set() throws Exception {
        MockObject mo = new MockObject(false);
        Expression t = new Expression(mo, "method", new Object[0]);
        t.setValue(mo);
        assertSame(mo, t.getValue());
        MockObject.assertNotCalled();
        t.setValue(null);
        assertSame(null, t.getValue());
        MockObject.assertNotCalled();
    }

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     * Test the setValue() method when the value of the expression is set by a
     * previous call to getValue().
     */
    public void testSetValue_Evaluated() throws Exception {
        MockObject mo = new MockObject(false);
        Expression t = new Expression(mo, "method", new Object[0]);
        assertEquals("method1", t.getValue());
        MockObject.assertCalled("method1", new Object[0]);
        t.setValue(mo);
        assertSame(mo, t.getValue());
        MockObject.assertNotCalled();
    }

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     * Test the getValue() method when the value of the expression is evaluated
     * by a previous call to getValue().
     */
    public void testGetValue_Evaluated() throws Exception {
        MockObject mo = new MockObject(false);
        Expression t = new Expression(mo, "method", new Object[0]);
        assertEquals("method1", t.getValue());
        MockObject.assertCalled("method1", new Object[0]);
        assertEquals("method1", t.getValue());
        MockObject.assertNotCalled();
    }

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     * Test the getValue() method when the value of expression is set by the
     * constructor.
     */
    public void testGetValue_Constructor() throws Exception {
        MockObject mo = new MockObject(false);
        Expression t = new Expression(mo, mo, "method", new Object[0]);
        assertSame(mo, t.getValue());
        MockObject.assertNotCalled();
    }

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     * Test the getValue() method when the value of expression is set by a
     * previous call to setValue().
     */
    public void testGetValue_Set() throws Exception {
        MockObject mo = new MockObject(false);
        Expression t = new Expression(mo, "method", new Object[0]);
        t.setValue(mo);
        assertSame(mo, t.getValue());
        MockObject.assertNotCalled();
    }

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     * Test the method getValue() with a normal object, a valid method name and
     * valid arguments.
     */
    public void testGetValue_UnboundedNormalInstanceMethod() throws Exception {
        MockObject mo = new MockObject(false);
        Expression t = new Expression(mo, "method", new Object[0]);
        assertEquals("method1", t.getValue());
        MockObject.assertCalled("method1", new Object[0]);
        t = new Expression(mo, "method", null);
        assertEquals("method1", t.getValue());
        MockObject.assertCalled("method1", new Object[0]);
    }

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     * Test the method getValue() with a normal object, a valid method that
     * throws an exception and valid arguments.
     */
    public void testGetValue_UnboundedExceptionalMethod() throws Exception {
        MockObject mo = new MockObject(false);
        Expression t = new Expression(mo, "method", new Object[] { null, null });
        try {
            t.getValue();
            fail("Should throw NullPointerException!");
        } catch (NullPointerException ex) {
            // expected
        }
        MockObject.assertCalled("method4", new Object[] { null, null });

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     * Test the method getValue() with a normal object and a non-existing method
     * name.
     */
    public void testGetValue_UnboundedNonExistingMethod() throws Exception {
        MockObject mo = new MockObject(false);
        Expression t = new Expression(mo, "method_not_existing", new Object[] {
                null, null });
        try {
            t.getValue();
            fail("Should throw NoSuchMethodException!");
        } catch (NoSuchMethodException ex) {
            // expected
        }
    }

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    /*
     * Test the method getValue() with a null object.
     */
    public void testGetValue_UnboundedNullTarget() throws Exception {
        Expression t = new Expression(null, "method_not_existing",
                new Object[] { null, null });
        try {
            t.getValue();
            fail("Should throw NullPointerException!");
        } catch (NullPointerException ex) {
            // expected
        }
    }

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